Explaining a tax outcome the client did not expect

An outcome email works when the client sees the number, the date it’s due and the one thing to do about it, all without scrolling. The explanation comes after that, and they decide for themselves whether they want it. Firms spend the longest on the explanation. Clients read it last, if at all.

• The message is about the distance between the balance and what the client was expecting. That’s why a $900 bill can land worse than a $40,000 one.
• Lead with the amount and the date it’s due. Put the explanation first and it reads as an argument for a number the client hasn’t seen yet.
• One cause, with a figure attached. A tax outcome has nine reasons in it, and a client holds one.
• Half of what they need is the practical half: how to pay, by when, and what happens if they can’t. Most firms leave that half for the client to ask about.

This is the message about a figure. When the news is that the work is running late, that message is written differently and on a different clock, in telling a client about a delay. When you’re still waiting on a document and the return is open, the message you want is the follow-up for a missing document. The chase for the signature that follows today’s message belongs to writing a deadline reminder that works. Everything below assumes the return is done, the number is right, and somebody has to say it.

The surprise is the subject, not the balance

Firms size this message against the balance due. Clients feel the gap between the balance and what they walked in expecting. Those two quantities are close to unrelated.

A contractor who has owed between fifteen and twenty thousand dollars every April for nine years opens a $17,400 balance and barely registers it. A salaried client who got $3,100 back last year, and has already spent it, opens a $400 bill and has just lost $3,500 in a single sentence. The second one is the harder email. It’s also the one that gets written in four lines, because the number looked small.

So before you write anything, work out what the client was expecting. It’s usually cheap to find, and it’s one of four things.

Last year’s outcome. The default. Absent any other information, a client expects roughly what happened last April. That expectation holds at full strength however much their life changed in between.

A number you gave them. A planning meeting in November, a projection, a sentence on the phone in October. If your firm named a figure, that’s the expectation, and it outranks last year. That case has problems of its own, and they’re further down.

A number their neighbor gave them. Someone at work got a big refund. A relative said the withholding tables changed. This expectation is invisible to you until the reply arrives.

Nothing. First return with your firm, first year of self-employment, first year after a death or a divorce. The client starts from blank. That sounds easier than it is, because a client starting from blank reads $6,000 as catastrophic, lacking any way to tell whether it’s normal.

Four kinds of surprise follow, and each wants a different message. A balance due where a refund was expected. A refund much smaller than last year’s. A first year of quarterly estimates, where the shock is the schedule rather than the amount. And the good surprise, a refund far larger than expected, which still wants a short message, because a large refund left unexplained is a client who thinks something has gone wrong.

Then there’s the majority of your list, which wants an ordinary message. A client whose outcome sits close to last year’s gets the return, the number and the signature request together. Send a carefully built explanation to somebody who expected this, and you teach them to brace every time your name appears in March.

Where the number should land first

One structural rule does more here than any wording choice: the number travels on its own.

The common failure is efficient and costs a week. The return is finished, so the packet goes out with the 8879 and a covering note. The client opens a signature request and a $14,200 balance in the same breath. What follows is silence. They have a question they’d rather somebody else asked, an amount to think about, and one easy way to defer both, which is to leave the signature unsigned. Ten days later your office is chasing an e-file authorization, and the real obstacle is a number still undiscussed.

Send the outcome first, on its own. Let the signature request follow once the client has replied. On a big surprise the gap is a day or two. On a small one an hour does it. The two arrive as two things, so the client’s reaction to the number stays a reaction to the number.

Three more rules about where it lands.

Let them hear it from you first. A portal notification saying documents are ready, an invoice, a packet of estimate vouchers, a spouse who opened the envelope. Each of those tells the client the firm knew the figure and stayed quiet, and that impression outlasts the balance by years.

Put the number in the body of the email. The attached return, the portal and a PDF called Summary are all places a client has to go looking. Someone reading on a phone in a parking lot gets the amount and the date from the message itself. Attach the return by all means, say what page the summary is on, and let the email work on its own.

On a joint return, write to both. Two addresses on the same message, always, and the reason is practical rather than procedural. A balance due that reaches one spouse first becomes a conversation you’re outside, run by somebody who has to field questions about it alone. The same goes for a business where the bookkeeper is your day-to-day contact and the owner is the one whose personal return this is.

Timing inside the day matters less than firms think, with one exception. A five-figure balance sent at six on a Friday evening leaves the client two days to think about it and an empty office to call. If it’s going out late in the week, either make yourself reachable or hold it until Monday morning and say why when you send it.

Lead with the amount and the date

The instinct is to build up to the number. Set the context, explain the year, walk through what happened, then land the figure once the client understands it. It fails every time, and the reason is mechanical rather than tonal. Clients read in their own order. They scan for the number, find it in paragraph four, read it cold, then go back through your first three paragraphs as an attempt to soften them up. You’ve spent your best sentences making the client suspicious.

Put the outcome in the first line and the due date in the second. Everything below that is optional, on purpose.

The working shape is four short lines before any explanation begins.

What the outcome is, as a figure. “Your 2026 return is finished. You owe $14,200 federal and $1,860 to Illinois.” Both numbers, together. Give the federal figure alone and the client pays it, feels finished, and meets the state bill six weeks later as a fresh surprise with your name on it.

When it’s due. An actual date. And where the payment date and the filing date are different things in this client’s situation, say so in the same breath rather than trusting them to know.

The one thing to do now. Exactly one. Read the draft, or tell me you’ve seen this, or pick a payment method. One ask, and an ask they can act on. “Let me know your thoughts” is a mood.

That there’s a reason, and it’s one sentence away. “The whole of the difference from last year is the Brightside contract work, and I have set it out below.” That line does real work. A client who is about to decide something has gone wrong learns here that the year is explainable, before reading a word of the explanation.

Then the explanation, then the payment mechanics, then the sentence about next year, then your offer to talk.

Subject lines follow the same principle. To a client scanning a phone the subject line is the whole message, so it carries the outcome rather than announcing that an outcome exists.

Your 2026 return: $14,200 due April 15, and where it came from

Your return is done. Smaller refund than last year, and why.

2026 return finished, $412 refund, nothing to pay

Your first year of quarterly payments, starting April 15

Three words belong out of the subject line. Unfortunately, important, and action required all raise the temperature and leave the client knowing exactly what they knew before. So does any version of “please review the attached”, which describes an email rather than a return.

One case keeps the figure out of the subject line, and that’s the shared or unsecured mailbox. A client whose assistant sees their subject lines, a family address, a business where the office manager triages the owner’s mail. There the subject says the return is finished, and the body carries the number.

One cause, with a number on it

A tax outcome is the sum of everything that happened in a year. The explanation is one line of that sum. What separates a message that lands from one that generates six replies is almost always how much of the sum you tried to send.

Pick the largest single contributor and give it a figure. “About $11,000 of the $14,200 is the RSU vesting in June.” For most clients that’s a complete explanation, and the arithmetic does the work rather than the words. A client who can attach three quarters of an unwelcome number to one identifiable event has stopped worrying that the year is broken.

Then a two-line comparison, and stop there. The most effective device in this message is last year against this year, on the two or three lines that actually moved.

Last year: total tax $18,400, withheld $19,000, refund $600.

This year: total tax $31,700, withheld $17,500, owed $14,200.

Four numbers, and they answer every question the client has. They also show which quantity moved, which is nearly always the one the client was watching least.

Use their words for the cause. “An increase in self-employment income” is a category. “The two months you spent on the Brightside job before you started at Kesler” is the same fact in a form the client recognizes, and a client who recognizes the cause takes it as read.

Leave out the mechanism. This is the discipline that costs firms the most, because the mechanism is the part you actually know. Marginal versus effective rates, the phase-out ranges, the QBI limitation, the ordering rules on capital gains, why the tables did what they did. All of it true, and all of it beside the question the client is asking, which is whether they can pay this by April. It reads as a wall between them and their answer. Offer it instead: “if you want to see how the rate works across the year, I will walk you through it on a call.” Roughly one client in twenty says yes, and that one gets a much better conversation than the paragraph they would have skipped.

One temptation is left, and it’s strongest exactly when the firm is in the right. You told this client in October to change their W-4. You put it in writing. April arrived with the W-4 where it was.

Every phrase that establishes this costs you. “As we discussed in the fall”, “you will recall we recommended”, “unfortunately the withholding was not adjusted as advised.” Each one is accurate, each one reads as a receipt for being right, and the balance stays where it is. The client already knows. State the cause once, in the plain past tense, and leave the audit trail out of it: “the withholding on your salary stayed where it was, and that accounts for about $6,000 of this.” The record belongs in your file, and in next year’s November letter. Writing that sentence generously in the third week of March, with forty of these to send, is a skill of its own, and it has a guide to itself.

Six reasons a client owes when nothing changed

The most common reply to an outcome email is some version of I made the same money and did the same things, so how is this different. It’s a fair question, and it usually has one of six answers. Having the sentence ready is most of the job.

Two more are worth recognizing on sight, though they come up less often. A client whose income came in higher than the estimate they gave the Marketplace repays part of the advance premium tax credit on the return. That arrives as a balance nobody budgeted for, and it comes from the credit rather than from withholding. And a retiree whose other income rose can find that more of their Social Security became taxable, which is a genuinely counter-intuitive result and worth a phone call rather than a paragraph.

Notice what all six of those sentences have in common. Each names one event, attaches a number to it, and stops. Each one leaves the rule alone.

When they compare it to last year’s refund

This is a different message from the balance due, and a harder one. From the client’s side the year went fine, and the email feels like bad news anyway.

They got $4,800 back last year. This year it’s $600. Same job, same house, same family. Their conclusion is that something went wrong, and the something is usually assumed to be either the government or you.

The honest answer is that total tax is the score. A client whose withholding was corrected mid-year can pay less tax and receive a smaller refund in the same year. So can a client whose raise was withheld more accurately than the old salary was. That’s a genuinely good outcome wearing the face of a bad one.

Show it rather than say it, in the same two lines as before.

Last year you paid $18,400 in total tax and had $23,200 withheld, so $4,800 came back.

This year you paid $17,900 in total tax and had $18,500 withheld, so $600 came back.

You paid $500 less tax this year. The refund is smaller because less of your own money was held back during the year, which mostly reflects the W-4 your employer had you redo in March.

Then leave the lecture alone, the one sitting right there about a refund being an interest-free loan to the government. It’s true, most clients have heard it, and it lands as an explanation of why they’re wrong to be disappointed. Some clients genuinely want the forced saving of over-withholding and are entitled to it. If this one does, the useful reply offers to set the withholding so next April’s refund is roughly the number they liked.

What is still open after December 31

The reply to a balance due, roughly four times in five, is some form of is there anything we can do about it. You’ll answer that question either way. Answer it in the first message, with the numbers already run.

A short list is genuinely still open after year end for an individual client.

A traditional IRA contribution for the prior year, up to the April filing deadline, where the client is eligible for the deduction. This is the one that most often turns out to be worth real money. Compute it before you write: “there may be some options” produces a phone call, and “a $7,000 IRA contribution would take the balance from $14,200 to about $12,700” produces a decision.

An HSA contribution for the prior year, on the same April deadline, where the client was covered by a qualifying high-deductible plan.

A SEP contribution for a self-employed client, which can be funded as late as the extended due date of the return. The equivalent rules for a solo 401(k) are narrower and worth checking on the specific facts before you put an amount in an email.

Both personal deadlines run to the April filing date, and an extension leaves them where they are. So the client’s window closes earlier than they think if the return is going on extension.

Everything else that clients propose has closed. Business expenses invented after the fact, a retroactive entity election, moving income into a year that’s over. Say so plainly and in one line, or you get two weeks of increasingly creative suggestions arriving one at a time.

And where the answer is genuinely nothing, say that too, in the outcome email itself: “I have already checked whether an IRA or HSA contribution would help here, and neither does, because of the plan you are in at work. The number is the number.” That sentence saves you both an entire exchange. It also tells the client the thing they were unsure of, which is that you looked.

The half of the message that is about paying

The client’s next problem is cash. An email that explains the number beautifully and stops there hands them a search engine and a bad afternoon.

Four things, in about five lines.

How to pay. Name the route rather than describing it. For most individuals that’s IRS Direct Pay from a bank account, which is free, and the state’s own portal, which is a different website with a different login. Say that paying by card carries a processor fee, because a client who hasn’t heard that will use a card. If your firm can schedule a direct debit with the e-filed return, say so, and say what date it comes out.

By when, and that the extension does not move it. This is the single most misunderstood point in the whole subject and it is worth one flat sentence: an extension moves the filing date and not the payment date, so tax owed is still due in April whatever happens to the return. The arithmetic behind that fork, and when to recommend it, is set out in tax extensions.

What happens if they can’t pay all of it. Raise this yourself, first, because a client who is frightened of the number frequently goes quiet instead of asking. One sentence, in the original message: an individual who owes $50,000 or less can generally set up a payment plan with the IRS online, interest continues to run, and the failure-to-pay penalty is charged at a lower rate while a plan is in place. That is enough to turn a panic into a question. It changes your April too, because filing on time and paying what they can is nearly always cheaper than the alternative, for reasons set out in the delay guide’s section on what lateness costs.

What the extra vouchers in the packet are. If next year’s estimates are in the package, tell the client before they find them. A client who opens a $14,200 balance and then four 1040-ES vouchers of $3,900 each reasonably concludes they owe $29,800, and reads the whole message again looking for the part where you hid it. One line settles it: “the four dated slips in the packet are next year’s quarterly payments, not part of what you owe now.”

One more, where it applies. If there’s an underpayment penalty on the return, name it separately and give its size. Clients find it on their own soon enough, and finding it unannounced is much worse than being charged it. “There is a $214 underpayment penalty in that figure, which is what it costs to have paid the tax in April rather than through the year, and the estimates below are how we avoid it next time.”

One sentence about next year

Every outcome email contains the seed of a good planning conversation, and almost every firm tries to have that conversation in the same message. The reason it fails is simple. A client who has just read a number they did not expect has spent their attention, and the planning proposal lands as an upsell attached to bad news.

One sentence now, naming the fix and stopping there. “This repeats next year unless we change the withholding on Priya’s salary, and it is a ten-minute job when you have a moment.” Or: “the four payments below are set at the level that keeps you out of penalty for 2027.”

Then the actual conversation, two or three weeks later, as its own message, once the balance is paid and the client is easy again. That message is the one that carries the safe harbor arithmetic, the choice between adjusting withholding and paying estimates, and what happens if next year’s income is lumpy. Firms that skip it write almost word for word the same email next April.

Two facts are worth holding in your own head while you write the one sentence, even though both stay out of it. Paying either 100% of the prior year’s tax or 90% of the current year’s generally keeps a client out of the underpayment penalty. The prior-year figure rises to 110% where their income was above $150,000, which makes the safe harbor much easier to hit for a client whose income is rising fast. And a withholding fix usually beats estimates for anybody who has a paycheck, because it’s one form once rather than four payments a client has to remember. The mechanics of the estimate conversation itself, and the reminders it needs, are a subject of their own.

Four outcomes written out

The ordinary balance, near enough to last year. The number stands on its own here, and an explanation would invent a problem.

Subject: 2026 return finished. $2,140 due April 15.

Hi Tom,

Your return is done. You owe $2,140 federal and $310 to Wisconsin, both due April 15. That is close to last year, and it comes from the same place: the interest on the money market account, which nothing is withheld on.

The draft is attached. If it looks right, reply and I will send the signature form today.

Payment is easiest through IRS Direct Pay from your checking account, no fee. Wisconsin has its own site and I will send you the link with the signature form.

Ruth

The large surprise, where a refund was expected.

Subject: Your 2026 return: $14,200 due April 15, and where it came from

Hi Marcus,

Your return is finished, and it is a balance due this year rather than a refund. You owe $14,200 federal and $1,860 to Illinois. Both are due April 15.

Almost all of it is the June RSU vesting:

Last year: total tax $18,400, withheld $19,000, so $600 came back. This year: total tax $31,700, withheld $17,500, so $14,200 is owed.

Your income went up by about $52,000 from the vest. Payroll withheld that at 22%, which is the flat rate they apply to that kind of payment, but the money landed in your 32% bracket. The ten-point difference is essentially the whole bill. Nothing on the return is wrong and nothing else moved.

I have checked whether a prior-year IRA contribution would help. It would: $7,000 before April 15 brings the federal number down to about $12,700. Tell me by the 20th if you want to do that and I will redo the return.

On paying: Direct Pay from your bank account is the simplest route and there is no fee. If the whole amount in April is a problem, say so now rather than later, because there are payment plans for this and they are routine.

This will happen again with the next vest unless we change something, which is a ten-minute fix. I will write to you about that separately in a couple of weeks.

I am around today and tomorrow if you would rather talk it through.

Ruth

The length is deliberate, and it’s spent on four things: the number, the arithmetic, an option that’s already costed, and permission to say they can’t pay. The rules stay out of it.

The refund that shrank.

Subject: Your return is done. Smaller refund than last year, and why.

Hi Dana,

Your return is finished. You are getting $600 back, which is a lot less than the $4,800 last year, so here is what moved.

Last year: total tax $18,400, withheld $23,200, refund $4,800. This year: total tax $17,900, withheld $18,500, refund $600.

You paid $500 less tax this year. The refund is smaller because less was taken out of your paychecks during the year, which is the new W-4 HR had everyone redo in March. Your money arrived in your paychecks instead of arriving now.

If you would rather have the bigger refund in April than the extra $390 a month, that is a completely reasonable preference and we can set the withholding back. Tell me and I will give you the exact figure to put on the form.

Nothing to pay. The refund should arrive in about three weeks once we file.

Priya

The first year of estimates.

Subject: Your first year of quarterly payments, starting April 15

Hi Alia,

Your 2026 return is done. You owe $9,300, due April 15. That is the first full year of the consulting income, and it is mostly the self-employment tax that came with it, which is about 15% on top of the income tax and the part nobody sees coming.

The bigger change is what happens now. Because the consulting is ongoing, you move to quarterly payments for 2027. There are four dated slips in your packet, $3,100 each, for April 15, June 15, September 15 and January 15. Those are next year’s tax, not part of the $9,300. It is easy to add them up and think you owe $21,700. You do not.

If it helps, I can set the four of them up as calendar reminders and write to you a week before each one.

The $9,300 goes through IRS Direct Pay. Reply when you have read this and I will send the signature form.

Ava

The ones you should not send cold

Some outcomes land worse in writing than the same words spoken, and the tell is the situation rather than the size of the number.

The balance is more than the client plausibly has. You usually know. A five-figure bill to somebody whose whole year ran on a small salary is a crisis rather than a piece of information, and a client who gets it by email spends the evening alone with it. Call, say the number, say there’s a way to handle it, then send the written version within the hour with everything in it.

It is materially worse than a figure you gave them. Covered in full below, and it’s always a call.

The cause is something the client did not tell you about. A withdrawal, a side business, a sale, a second household. The email version of that conversation reads as an accusation however it’s written, and you may also be wrong about what happened.

The outcome exposes something between two people. A joint return where one spouse’s income, debt or withholding is the cause. A partnership where one partner’s distributions are the story. Think about who reads it first, before you write a line.

The client has been difficult about fees or about your work already. The message itself stays the same. A cold number in an existing dispute gets answered in the dispute’s tone.

The call comes an hour ahead of the email, and the email still goes. A conversation leaves two memories, and both of them fade. The client has to relay it to a spouse or a partner, and the payment details are gone by the evening. Say it, then write it, and make the written version complete rather than a summary of the call. If getting to the call is the obstacle, booking without the back and forth is the mechanical half of that problem.

When your own estimate was the problem

The hardest version of this message, and the only one where the outcome is partly yours.

You told the client in November they’d owe about $4,000. The return says $19,000. Whatever else the message does, it deals with that first, because the client’s trust in the $19,000 rests on your account of the $4,000.

Four things, in this order.

Name the gap yourself, first, in the subject line if it fits. “Your 2026 return, and why it is higher than the number I gave you in November.” A client who finds the discrepancy on their own has learned something about the firm, and it stays learned.

Say what the projection was missing, factually, and leave the defense out. “The projection was built on your salary and the Kesler contract. The December fund distributions and the second RSU tranche were not in it.” That sentence is doing something specific. It separates what you knew from what you missed, which is what lets the client judge whether the same thing happens next year.

Say whose it is. If the information reached you and sat there, say so plainly. If the client first mentioned a $60,000 event in March, that’s a fact with a date on it, stated once, in the past tense. Where your projection method was also thin, it’s one reason of two. Either way the message stays a message rather than a case.

Say what changes in the process. One specific undertaking, smaller than a promise about care. “From this year I will rerun the projection in the first week of January rather than in November, when the December distributions are known.” A client can evaluate that. An assurance that you’ll be more careful leaves them guessing.

On the fee. Reduce it where your work cost the client something measurable, such as a penalty that a correct projection would have avoided, and reduce it for that reason rather than by reflex. Where the projection was reasonable on what you knew at the time, an unprompted discount concedes that the year’s work was overpriced, and that concession stands when you bill them again.

And then the part that sits outside the writing altogether. If your firm sends more than one of these in a season, the November projection is the problem rather than the March email, and better wording leaves it exactly where it is.

What Point does with the replies

All of this is judgment rather than software. Firms explained tax outcomes on headed paper for a century, and the judgment in it stands where it stood. What a tool changes is the seventy-two hours after forty of these go out, which is the part of the job that actually breaks.

That’s the shape of the problem. The message itself takes fifteen minutes, with your full attention on it. Then the replies come back, all at once, mixed into the same inbox as everything else in the last week of March.

• A “thanks, got it”.
• Four “can we talk”.
• A request to redo the return with the IRA contribution.
• One that says the client can’t pay this, and has been staring at it since Friday.
• Eleven that are just signature forms.

They arrive in the order they were sent, and they matter in a different order entirely.

Point sorts that pile on what needs you today rather than on arrival order. The one client who has replied to say they can’t find $14,200 comes up ahead of the eleven signature forms and the two thank-yous. The weighing behind that ordering is set out separately, and the distinction doing the most work in a week like this one is important against urgent, because on outcome week almost everything is urgent and only some of it matters. Every thread carries a plain summary, and on a return thread it answers the question you have before you open anything: is this client agreeing, asking, or struggling.

The writing itself is the other half. The draft arrives in your own hand, so the message you’ve put off since Tuesday starts as something to correct. Where a client’s mail arrives in Spanish, the draft is in Spanish too. A standing instruction lives as one plain sentence you can read and change, so “always give the state number in the same line as the federal one” is something you say once rather than a habit you carry in your head across forty returns. A question you asked and heard nothing back on is kept as something you’re owed, dated, and raised again when the date passes. That matters more on this message than on most, because you’re waiting on a decision about money, and a client who is still deciding rarely writes to say so. Where the answer is a conversation, Point runs the back and forth to find a slot, and the meeting lands on the calendar you already keep.

The setting for how far Point takes something is held per kind of action, and all of them ship at review, so the work gets prepared and then waits. On this subject the setting worth moving first is the sorting rather than the sending. The outcome email carries a figure, a payment instruction and sometimes an apology, so that one wants your name on it and your eyes on it before it goes, at any setting. How the dial works is set out properly elsewhere. Every action taken on your behalf leaves a timed entry in order, and that entry is the place you approve it, decline it or reverse it. One limit is absolute and belongs to email rather than to any product: a message sitting on somebody else’s server stays sent, which is its own argument for reading a five-figure number twice before it goes.

Getting started is one sign-in, against the mailbox your firm already has, Google or Microsoft. The mail sits where it sat and the address reads the same, so a client who wrote in February writes to the same place in March.

Most of this page sits outside what Point does. What this client was expecting, whether $14,200 is survivable for them, whether the cause is one worth naming, whether this particular return should be a phone call at nine in the morning instead: those are yours. The full list of what Point does handle is on the benefits page, and AI email for accountants works the buying question through a small practice. If the doubt underneath the whole question is whether client tax data should be going near an AI product at all, that one comes first and is taken apart properly here.

Common questions

How do I tell a client they owe money on their tax return?

Put the amount and the due date in the first two lines. Give the federal and state figures together, and name one thing for them to do now. Then one sentence of cause with a number attached to it, then how to pay and what to do if they can’t, then a single line about next year. Lead with the figure: a client scans for the number, finds it in paragraph four with no context, and reads everything above it as an attempt to soften them up. Send the balance on its own too, ahead of the signature request, because the easiest way for a client to defer an uncomfortable number is to leave the 8879 unsigned.

How much should I explain about why the balance is what it is?

One cause, quantified, plus a two-line comparison of last year against this year on the numbers that moved. That’s enough for almost every client. Leave the mechanism out entirely, meaning marginal versus effective rates, phase-outs and ordering rules, and offer a call to anyone who wants it. A client reads the size of an explanation as a signal about the size of the problem, so four paragraphs on the code produce more anxiety than one sentence does. Most of those paragraphs go unread anyway.

What do I say when a client’s refund is smaller than last year?

Show the total tax rather than arguing about the refund. Four numbers do it: total tax and amount withheld for each year. In most cases the client sees that they paid the same or less tax and simply had less withheld during the year, usually because of a W-4 change or a raise that was withheld more accurately. Skip the lecture about a refund being an interest-free loan. It’s true, and it lands as a correction of their preferences. If they’d genuinely rather have the big April refund, offer to set the withholding to produce it.

Should I call the client or send an email?

Email for the great majority, because a written outcome can be reread, forwarded to a spouse, and used to pay the bill. A phone call leaves a memory. Call first in five situations. The number is more than the client plausibly has. It’s materially worse than a figure your firm gave them. The cause is something they kept back. The outcome exposes something between two people. Or the relationship is already tense. In every one of those the call comes first, and the full written version still follows within the hour.

Can anything be done after the year has ended?

A short list stays open, and it’s worth running before you write rather than after the client asks. A deductible traditional IRA contribution and an HSA contribution can both still be made for the prior year up to the April filing deadline, which is the original April date even where the return goes on extension. A self-employed client can fund a SEP as late as the extended due date of the return. Compute the effect and put the actual figure in the email, since “there may be some options” produces a phone call and “$7,000 into an IRA takes this from $14,200 to about $12,700” produces a decision. Where the answer is nothing, say that you checked and say why.

What if the client cannot pay what they owe?

Raise it before they do, in the original message, because a frightened client often goes silent rather than replying. One sentence is enough: an individual owing $50,000 or less can generally set up a payment plan online, interest keeps running, and the failure-to-pay penalty is charged at a lower rate while a plan is in place. Say in the same breath that an extension postpones the filing and never the payment, so the return still goes in on time. The detail matters less than the effect it has. The client learns there is a normal route through this, before they have spent a weekend assuming otherwise.

Should the next-year conversation be in the same email?

One sentence, and that’s the whole of it. Name the fix and stop: the withholding change, or that the estimates below are set at the level that avoids a penalty. A client who has just absorbed an unexpected number has spent their attention, and a full planning proposal attached to bad news reads as an upsell. Send the real conversation two or three weeks later as its own message, once the balance is paid. Firms that skip that second message write nearly the same email to the same client next April.

The short version

Work out what the client was expecting before you write. The message is about the gap rather than about the balance, and a $400 bill to somebody counting on $3,100 back is the harder email. Send the number on its own, ahead of the signature request, to both spouses, in the body of the message rather than only in the attachment. Lead with the amount and the due date, federal and state together, then one thing to do now. Give one cause with a figure on it, and a two-line comparison of last year against this year. Leave the mechanism out and offer a call instead. Resist every sentence that establishes you were right in November. Answer the “can anything be done” question before it’s asked, with the IRA or HSA number already computed. Then spend five lines on the part that is about cash. How to pay. That an extension moves the filing and leaves the payment where it is. That a payment plan exists. What those four extra slips in the packet are. One sentence about next year, and the real planning conversation two weeks later. Call first where the number is bigger than the client’s bank balance, where it’s worse than a figure you gave them, or where it exposes something between two people, and send the written version within the hour anyway. Once it’s filed, the message that closes the loop is a different one, and the turnaround you promised for the replies this email is about to generate is set in your response time policy.