Client Email Templates for US Accounting Firms
Ten emails every CPA, tax and bookkeeping firm sends — written once, ready to copy.
These are ready-to-copy email templates for the communications US CPA, tax and bookkeeping firms send most: onboarding, engagement letters, tax season kickoff, document requests, extensions, estimated taxes, invoices and year-end planning. Each one uses merge fields you can replace manually or map to Remindoo's client tokens.
Last updated: September 16, 2026 · Reviewed by Waqas Sagar, ACA FCCA, chartered accountant (UK) and founder of Remindoo.
How merge fields work
Fields in {curly braces} can be replaced manually. In Remindoo, use the matching tokens such as Client Name and Company Name. Fields in [square brackets] are details you fill in for each send, such as dates, amounts and document lists.
Ten client email templates you can copy
Edit the tone to match how your firm speaks. Check every date, amount and form reference before you send.
1. Welcome a new client
Immediately after a prospect agrees to work with you
Subject: Welcome to {Firm Name}
Hi {Client Name}, welcome to {Firm Name}. We're glad to be working with you. Over the next few days we'll send your engagement letter to review and sign, then a short list of the information we need to get started. If you have questions at any point, just reply to this email. We look forward to working with you.
Use this in Remindoo →2. Engagement letter ready to sign
As soon as the engagement letter is prepared
Subject: Your engagement letter from {Firm Name}
Hi {Client Name}, your engagement letter is ready. It sets out the services we'll provide, what we'll need from you and our fees. Please review and sign it by [date] so we can begin work. If anything needs changing, reply and we'll update it.
Use this in Remindoo →3. Tax season kickoff
Late in the calendar year, before documents start arriving
Subject: Getting ready for tax season, {Client Name}
Hi {Client Name}, tax season is almost here. To prepare your return on time, please start gathering your tax documents now. We'll send a checklist of what we need shortly. Sending documents early gives us time to review your return properly and answer your questions before the deadline.
Use this in Remindoo →4. Document request
When you are ready to start the return
Subject: Documents needed for your [tax year] return
Hi {Client Name}, to prepare your return we need the following: [list — e.g. Forms W-2, 1099-NEC, 1099-INT/DIV, Form 1098, prior-year return, records of estimated tax payments]. Please send them by [date]. If a document doesn't apply to you, just let us know.
Use this in Remindoo →5. Missing documents follow-up
When the requested information has not arrived
Subject: Still needed: documents for your return
Hi {Client Name}, we're still missing [documents] for your [tax year] return. Without them we can't finish your return by [date]. Please send them as soon as you can, or reply if you need help finding them.
Use this in Remindoo →6. Extension filed
After an extension has been filed for the client
Subject: We've filed an extension for your return
Hi {Client Name}, we've filed an extension for your [tax year] federal return, which gives more time to file. An extension to file is not an extension to pay; any tax owed is still due by the original deadline. We'll be in touch about next steps and any payment needed.
Use this in Remindoo →7. Estimated tax payment reminder
Ahead of each estimated tax payment date
Subject: Estimated tax payment due [date]
Hi {Client Name}, a reminder that your next estimated tax payment of [amount] is due on [date]. If your income has changed significantly, let us know before you pay so we can review the amount with you.
Use this in Remindoo →8. Invoice sent
When the invoice for completed work goes out
Subject: Invoice {Invoice Number} from {Firm Name}
Hi {Client Name}, your invoice for [service] is attached. The amount due is [amount], payable by [date]. You can pay online using the link in the invoice. Thank you for your business.
Use this in Remindoo →9. Year-end planning check-in
In the closing months of the calendar year
Subject: Year-end planning with {Firm Name}
Hi {Client Name}, as the year closes, it's a good time to review your finances before December 31. If you've had major changes this year — a new business, a home purchase, a change in income — let's schedule a short call to talk through planning options.
Use this in Remindoo →10. Thank you and review request
After the engagement is complete
Subject: Thank you from {Firm Name}
Hi {Client Name}, thank you for trusting us with your [service] this year. If you were happy with our work, we'd appreciate a short review — it helps other businesses and families find us. [review link]
Use this in Remindoo →How to standardize client email in your firm
Pick the ten emails you send most
Look through a month of sent mail and list the messages that repeat. For most firms it is onboarding, engagement, document requests, chasing, extensions, estimated taxes, invoices and year-end.
Agree one version of each
Have one person draft it and one person review it. The goal is a version the firm is happy to send to any client, not a version everyone loves equally.
Add merge fields
Replace names and firm details with merge fields so the template can be used as-is. In Remindoo those become client tokens such as Client Name, Client Type, Company Name and Address.
Set one firm signature
Put the logo and firm details in a global header and footer rather than in ten personal signatures. Then a change of address or phone number is one edit.
Review before each tax season
Read the whole set once a year, in the fall. Dates, form references and fee wording drift, and finding that out in February is expensive.
Once the wording is agreed, email management in Remindoo holds the templates, the global header and footer and the reply settings, so the whole firm sends the same version.
Frequently asked questions
What emails should an accounting firm template?
Template the messages you send repeatedly and word almost identically each time: welcoming a client, sending the engagement letter, opening tax season, requesting documents, chasing what is missing, confirming an extension, reminding about estimated taxes, sending invoices, year-end planning and thanking a client afterwards.
How do I write a document request email to clients?
Say which return it is for, list the specific documents rather than asking for everything, give a date you need them by, and tell the client what to do if something does not apply to them. A clear list gets a faster reply than a general request to send tax documents.
What should an extension email say?
Confirm which return the extension covers and make the payment position explicit: an extension of time to file is not an extension of time to pay, and tax owed is still due by the original deadline. Then say what happens next. Confirm current requirements on IRS.gov before sending.
How often should I send tax season reminders?
There is no single right cadence. A common pattern is an early kickoff, a document request when you are ready to start, and follow-ups spaced far enough apart to be useful rather than irritating. Decide the schedule once, apply it consistently, and review it after the season.
Can I use these templates in Gmail or Outlook?
Yes. They are plain text you can paste into any email tool, save as a canned response or a Quick Part, or load into your practice management system. If you use Remindoo, you can create them as email templates and swap the curly-brace fields for client tokens.
How do merge fields work?
A merge field is a placeholder the system replaces with that client's details when the email goes out, so one template reads personally for every recipient. In these templates the placeholders are in curly braces. In Remindoo, the equivalent tokens include Client Name, Client Type, Company Name and Address.
Sources
- IRS: About Form 4868 — extension of time to file an individual return
- IRS: About Form 1040-ES — estimated tax for individuals
Templates are general examples, not tax or legal advice. Confirm deadlines and requirements with IRS.gov and your state agencies before relying on any wording here.
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Send these from your firm's system
Bring your most-sent client email to a walkthrough and we will set it up as a branded, personalized template on the call.