The best email software for a CPA firm is usually two things. One is the mail service you already pay for, Microsoft 365 or Google Workspace. The other is one tool on top, picked for the place your mail breaks. If clients write to one address that several people answer, that’s a shared inbox. If mail has to land on a job with a status, that’s practice management. If each person’s own inbox is the problem, that’s an AI email client.
This page compares those four kinds for a firm with staff. Prices were checked on October 4, 2026, and there’s a worked cost for seven seats. It ends with a two-week test you can run on your own mail. Point is one of the options, and its section comes after the test.
What software CPA firms use
Most firms run five layers. Email software is one of them, and it touches all the others.
- Tax preparation. The program the returns are built in.
- Practice management. Jobs, deadlines, staff assignments, often billing and a client portal.
- Documents. Where the W-2s, K-1s and workpapers live, inside the portal or beside it.
- The mail and calendar suite. Microsoft 365 or Google Workspace, with every address on it.
- The email layer. How each person reads, sorts and answers what arrives.
This page is about the last layer. Email marketing software is a separate purchase. Newsletters and campaigns go out through it, and client conversations don’t.
Email software for a CPA firm comes in four kinds
Every product a firm is likely to shortlist falls into one of these.
| Kind | Examples | What it does for a firm | Where it stops |
|---|---|---|---|
| The suite’s own app, with its AI | Outlook with Copilot, Gmail with Gemini | Each person reads their own mail, with summaries and drafting built in | Nothing is shared unless you set up delegation or a shared mailbox |
| Shared inbox | Front, Missive | Several people work one address together, with assignment and internal comments | It’s built around the shared address, and knows little about the client’s engagement |
| Practice management with email | Karbon, TaxDome, Canopy, Financial Cents | Client mail lands on the client and the job, where the team can see it | Email is one part of a larger system, priced like one |
| AI email client | Point, and others | Each person’s mail is read, ranked, summarized and drafted for | It works on the mail, not the engagement |
Most firms of five to twenty people end up with the suite plus one of the other three. A few run practice management and an AI email client side by side, because they solve different halves.
What each one costs, checked October 4, 2026
All prices are per user per month on annual billing unless the row says otherwise.
| Product | Plan | Price | What matters for email |
|---|---|---|---|
| Microsoft 365 | Business Basic | $7.00 | Web and mobile apps only |
| Microsoft 365 | Business Standard | $14.00, or $23.50 with Copilot | Copilot adds thread summaries and drafting |
| Microsoft 365 | Business Premium | $32.00 with Copilot | The top business plan |
| Microsoft 365 | Copilot Business add-on | $21.00 ($18.00 first year if bought by December 31, 2026) | For firms already on a business plan |
| Google Workspace | Business Starter / Standard / Plus | $7 / $14 / $22 | Gemini in Gmail is included from Starter up |
| Front | Starter / Professional / Enterprise | $25 (up to 10 seats) / $65 / $105 | Its AI Copilot is $20 a seat extra below Enterprise |
| Missive | Starter / Productive / Business | $14 (up to 5 users) / $24 / $36 | 30-day trial of Productive, no card |
| Karbon | Team / Business | $59 / $89 ($79 / $99 monthly) | Email and Triage on both; each shared inbox adds a monthly fee |
| TaxDome | Pro / Business | $1,000 / $1,200 a year | Essentials, at $800 a year, is one user only |
| Canopy | Standard / Plus / Premium | $74 / $109 / $149 | A unified inbox for client communications |
| Financial Cents | Team / Scale | $49 / $69 ($69 / $89 monthly) | A shared email inbox starts on Scale |
| Point | Private beta | No published price | Priced per seat; access is by waitlist |
Prices move. Each vendor’s page is linked, and it’s worth a look on the day you buy.
What seven seats cost
Here’s the same firm priced four ways. Seven people, annual billing, before tax.
- The suite with its own AI. Microsoft 365 Business Standard with Copilot is 7 × $23.50, or $164.50 a month. Google Workspace Business Standard is 7 × $14, or $98 a month, with Gemini included.
- The suite plus a shared inbox. Add Missive Productive at 7 × $24, or $168 a month. Missive’s Starter plan stops at five users. Front Starter would be 7 × $25, or $175 a month, and Professional would be $455.
- The suite plus practice management. Add Karbon Team at 7 × $59, or $413 a month. TaxDome Pro is 7 × $1,000, or $7,000 a year, about $583 a month. Financial Cents Scale, the plan with the shared inbox, is 7 × $69, or $483 a month.
- The suite plus an AI email client. Point has no published price yet. Ask for one when you join the waitlist.
Practice management costs more because it does more. You’re paying for workflow, billing and a portal, and the email is part of it. Compare it with a shared inbox only if email is the whole reason you’re looking.
The criteria that change once a firm has staff
A sole practitioner chooses for one desk. A firm chooses for mail that passes through several people. These are the questions that decide it.
Where client mail actually arrives
Look at last month’s client mail. Count how much came to personal addresses and how much came to tax@ or info@.
If most of it goes to people, the suite’s app or an AI email client fits. If a shared address carries a lot of it, you need something built for a shared address. How a shared mailbox gets worked without two replies going out is covered in one mailbox, two accountants. If one partner reads several addresses, the mailboxes one partner reads covers that.
Whether mail has to attach to the job
Some firms need every client email filed against an engagement, with a status the whole team sees. That’s what practice management does. Karbon puts client emails on the client timeline “so the team can keep things moving when someone is out.” TaxDome can turn a client email into a task with the client already filled in.
If your jobs already live somewhere and the trouble is just reading and answering, you don’t need that. Whose list a client email lands on walks through the handoff from email to task in more detail.
Who can see whose mail
Every tool that shares mail across the team has a setting for it. Karbon, for example, added one in 2019 that shares all of a user’s emails with any contacts in Karbon. Decide your answer before you connect anything. Ask each vendor three things:
- Is sharing on or off by default for a new user?
- Can a partner keep some threads private?
- What does an admin see that staff don’t?
What the vendor can account for
Once your firm prepares returns, it counts as a financial institution under the FTC Safeguards Rule (16 CFR 314.2). Any email tool that reads client mail is a service provider. 16 CFR 314.4(f) says what the firm owes in choosing one:
Oversee service providers, by: (1) Taking reasonable steps to select and retain service providers that are capable of maintaining appropriate safeguards for the customer information at issue; (2) Requiring your service providers by contract to implement and maintain such safeguards; and (3) Periodically assessing your service providers based on the risk they present and the continued adequacy of their safeguards.
So the purchase is part of your security plan. Keep each vendor’s written answers with it. With seven people, that also means knowing which tools each person connected on their own. The questions to put to a vendor before it reads client tax data are in what to ask of an email client. What a firm should be able to tell a client about all this is in the questions clients ask about their records.
Who decides what goes out
A reply about a client’s return is advice, and it goes out under the firm’s name. Look for drafts that wait for a person by default. Each person should be able to see what the software did. AI replies that sound like the firm covers where the approval gate sits for a team.
What each person’s morning needs
A partner, a manager and a preparer want different things at the top of their day. Software that ranks and summarizes each person’s own mail helps all three. What a firm’s morning briefing carries shows it role by role. Reading a colleague’s thread covers summaries of a thread somebody else started.
How it reaches your tax software
Tax software and email rarely meet directly. Where they’re linked, it’s usually through practice management. If that link matters to you, ask each practice management vendor which tax programs it connects to and what passes across. An email client sits beside both.
Which kind fits which firm
Start from what went wrong last month.
- Two people answered the same client. That’s a shared address without ownership. A shared inbox, or practice management with a shared triage view, is the fix.
- Nobody knew where a return stood. That’s an engagement problem. Practice management is the purchase.
- Partners are buried and replies are slow. That’s each person’s inbox. An AI email client, or the suite’s own AI, is the place to start.
- The mail is calm and nothing slipped. The suite on its own may be enough. Keep your money.
Firms often have two of these at once. That’s when practice management and an AI email client sit side by side. One holds the job, the other holds each person’s mail.
A two-week test for a firm
A demo inbox always looks good. Your own mail, read by three of your people, is the fair test.
- Pick three people. A partner, a manager and someone who works the shared address, if you have one.
- Pick five threads each from last month. Use a client with a deadline in it, a document you asked for that hasn’t come, and a long thread two of you touched. Add something sent to tax@ and a notice from the IRS or a state.
- Write down what should happen to each one. Who should see it, where it should rank, and who owns the reply.
- Connect the tool and run a normal two weeks. Keep your current app working beside it.
- Compare at the end. Count the threads that landed where you wrote they should. Ask each person what they stopped doing by hand.
Run the test before your next busy stretch, not in the middle of one. Software that connects to your existing mailbox makes that easy. Nothing changes for clients while you look.
How Point fits a firm’s mail
Point is the AI email client in the table above. Each person connects their own Gmail or Microsoft 365 mailbox, and keeps their address, history and contacts. There’s nothing to migrate, and clients see no change.
Here’s what a Tuesday looks like for your people.
- Their mail and the team’s threads sit in one feed. What needs them is at the top, weighed for importance and urgency.
- Every thread has a plain summary. A manager picking up a colleague’s client reads one line before opening fifteen messages.
- What they’ve handed off comes back. A document request to a client returns when it’s worth chasing.
- Drafts wait for them by default. Point drafts in their voice. Nothing goes until they send it, unless they raise the dial for that kind of work.
- A log shows what Point did. Anything can be approved, turned down or reversed.
- Risky mail is set aside before it reaches anyone.
Point works on the mail. Your practice management, portal and tax software stay where they are. It’s in private beta, priced per seat, and a plan grows a seat at a time as the team does. The full list is on the benefits page.
When another kind fits better
- Your engagements are the problem. If returns lose their place between staff, practice management is the purchase.
- One shared address carries most client mail. A shared inbox gives that address ownership and internal comments.
- Your firm lives in Outlook and wants nothing new. Copilot inside Outlook summarizes and drafts in the app your people already use. Where Copilot in Outlook stops is worth reading first.
- Documents should leave email altogether. A client portal is the route for returns and anything with a client’s numbers going out. The version in play covers attachments.
Common questions
What is the best email software for a CPA firm?
For most firms it’s the suite you already pay for plus one tool on top. Choose the tool by where mail breaks. A shared inbox fits a busy shared address. Practice management fits when mail has to attach to jobs. An AI email client fits when each person’s own inbox is the bottleneck.
What software do CPA firms use?
Most use five layers. There’s tax preparation software, practice management, document storage or a portal, and a mail suite such as Microsoft 365 or Google Workspace. On top of the suite sits whatever each person uses to read and answer mail.
Can ChatGPT do bookkeeping?
A general chatbot can explain an entry or sort a list of transactions you paste in. It doesn’t keep the books. It isn’t connected to your ledger, and it can be confidently wrong. Pasting client data into it is a data-handling decision first. Is it safe to use AI with client financial data? covers that question.
Is email software the same as email marketing software?
No. Email marketing software sends newsletters and campaigns to lists. Email software is where your people read and answer client mail. Many firms use both.
Do we have to change our email address to switch email software?
Not with software that connects to the mailbox you have. Your Microsoft 365 or Google Workspace account stays where it is. Clients keep writing to the same addresses, and you can stop using the software without losing mail.
Does the Safeguards Rule apply to the email software we choose?
Yes, once the software handles client information. The rule treats tax preparers as financial institutions. It asks them to choose capable service providers, require safeguards by contract and review those providers from time to time.