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Bookkeeping engagement letter templates: clauses and onboarding emails you can send

A bookkeeping letter outline you can paste, plus four emails from send the letter through the first close calendar, with AICPA sources on when a letter is required.

By Fabren EditorialPublished October 20, 2026
12 min read

Audience

Owners and admins at small CPA and bookkeeping firms opening new monthly books

Core takeaway

Name the services, the close day, what you will not do, and the client duties, then send the letter before you ask for a login.

A bookkeeping client who has not signed a letter is not a client. They are a prospect sitting in your ledger. The letter names the job. The emails get the letter signed, collect access, and set the first close date. Paste these, change the brackets, have counsel read the letter before it is your firm's letter.

Paste the letter, change the brackets, then send the four emails in order. The intake board that sits around them is client intake and task tracking. The ten working days after they sign are client onboarding. For 1040 chasing, use the missing tax documents email templates.

01

The letter is the job. The emails get it signed.

AICPA's Annual Tax Compliance Kit treats an engagement letter as the contract that sets the services you will provide. The sample letters and the terms addendum were built with CNA, the endorsed underwriter of the AICPA Professional Liability Insurance Program. AICPA tells you to have counsel review them, and to consider your own carrier. A 1040 letter does not cover bookkeeping. Use the letter that matches the work. (Annual Tax Compliance Kit)

The outline below is a bookkeeping letter you can edit. It is not AICPA letterhead. It is not a compilation, review or audit letter. If you are also preparing financial statements under SSARS, read AICPA's preparation, compilation and review materials and use that letter instead of this one. (Preparation, compilation and review standards)

02

What the letter has to cover

ClauseWhy it has to be on the page
Parties and entityThe legal name. Related LLCs are separate letters or a named list.
Services you will doMonthly books, recon, a pack on business day [N]. Name each.
Services you will not doPayroll, bill pay, sales tax, filing, advice on a transaction you have not been hired for
Client dutiesConnect feeds, answer named questions by a date, keep source documents
Basis and softwareCash or accrual. QuickBooks Online or Xero. Who owns the subscription.
Close day and packWhich reports. That the pack is management information, not a compilation or review, unless you have a separate SSARS letter.
Fee and when it is billedMonthly fee, what extra work costs, when you stop work for nonpayment
Term and how either side ends itA written notice period. Who keeps the ledger login.
RecordsYou keep copies as your workpapers. They keep originals and the subscription.

A new client needs a letter. Extra work under different standards needs a letter. A short addendum can cover a minor add on if it states the request, your response, the fee, and that the original terms still apply. Texts are a bad place for that. (Do I really need a new engagement letter for that?)

03

Bookkeeping engagement letter templates you can paste and edit

Have counsel review this against your carrier and your state board rules before you send it. Brackets are yours to fill.

Subject

Not an email. This is the letter body.

[Date]

[Client legal name]

[Signer name], [Title]

You have asked [Firm] to provide monthly bookkeeping services for [Client legal name] (the Company). This letter confirms the services, your duties, our fee, and the limits of the work.

Services. Each month we will, for the accounts listed in Exhibit A: categorize bank and card activity in [QuickBooks Online or Xero]; reconcile those accounts to the institution statements; post the recurring entries we have agreed in writing; and send a reporting pack by business day [N] of the following month. The pack will include a short cover note, a profit and loss, a balance sheet, AR and AP if those modules are in use, and a list of open questions.

Not in this letter. We are not hired to pay bills, run payroll, file sales tax, prepare or sign a tax return, or issue a compilation, review or audit report. If you want any of those, we will send a separate letter first. We will not start that work on a verbal.

Your duties.You will keep the [QuickBooks Online or Xero] subscription in the Company's name, connect every in scope bank and card feed, send statements and receipts we name, and answer questions on the open list by the date we put on that list. You remain responsible for the accuracy of the information you give us, and for decisions about the business.

Basis. We will keep the books on the [cash or accrual] basis unless we both agree in writing to change it. The pack is management information for your use. It is not a financial statement we have compiled, reviewed or audited.

Fee. [Amount] per month, billed on [day], for the services above. Work outside this letter is billed at [rate] after we write down the extra scope. We may pause work if an invoice is more than [N] days past due.

Term.Either of us may end this letter with [N] days' written notice. You keep the ledger and the source documents. We keep copies of our workpapers.

Please sign and return this letter through [portal]. We will not open the books until we have it.

[Firm signer name], [Title]

Accepted: [Client signer], [Date]

Attach Exhibit A: legal name, EIN, entity type, year end, software, accounts in scope, close day, pack contents, client contact, reviewer.

04

Email 1: send the letter

Subject

Your bookkeeping engagement letter from [Firm]

Hi [First name],

Attached, and in the portal at [Upload link], is the engagement letter for monthly bookkeeping for [Client legal name]. It names what we will do, what we will not do, the close day, and the fee we discussed ([Amount] per month).

Please read it, send any edits in a reply, and sign in the portal. We will not ask for logins or start coding until it is signed.

If anything in the letter does not match what you thought we agreed, say so on this email before you sign. It is cheaper to fix the letter than to argue in month three.

Thanks,
[Your name]
[Firm] | [Phone]

05

Email 2: signed, here is access

Subject

Next step: access for [Client legal name] books

Hi [First name],

We have your signed letter on file. Thank you. Here is what we need so we can open the file. Please do these in the portal, not by emailing a password.

[Access list]

A complete [Access list] looks like this:

  • Invite [Firm email] as accountant on the QuickBooks Online or Xero file for [Client legal name] only
  • Connect the operating account and the card ending [last four], or tell us in writing that a feed is not available and you will upload statements
  • Name one person we should email with coding questions

When those three are done, we will send the first close calendar.

[Your name]

06

Email 3: first close calendar

Subject

First close for [Client legal name]: [Month]

Hi [First name],

Access is working. We will close [Month] by business day [N] ([Date]). To hit that date we still need:

[Outstanding list]

Upload here: [Upload link]

After this first close, the monthly rhythm is: we send a named missing list on business day 1, you answer by business day [X], we send the pack on business day [N]. If something will not arrive, reply with the item and a date. We will park it on the pack rather than guess.

[Your name]

07

Email 4: we are live, here is how questions work

Subject

[Client legal name] books are live. How questions will work

Hi [First name],

[Month] is closed and the pack is in the portal. Going forward:

We will email questions as a named list, not as a forward of a bank line with "???" in the subject. You can reply on that email or upload a receipt. If an item does not apply, say so in a sentence we can file ("that Amazon charge was personal, reimburse me" is usable; "ignore" is not).

If you want us to add payroll, bill pay, a second entity, or a tax return, we will send a new letter or an addendum first. We will not add it because it came up on a call.

Questions about this pack? Reply here or call [Phone].

[Your name]

08

What stays out of email

  • Passwords, EINs, SSNs, full card numbers. Portal or a password manager invite.
  • A verbal 'yes, add payroll' with no letter.
  • Tax advice dressed up as a bookkeeping question. That is a different engagement.
  • The signed letter as a photo in a text thread. Keep the signed PDF in the file.

Placeholders: [First name], [Firm], [Client legal name], [Amount], [Upload link], [Access list], [Outstanding list], [Month], [Date], [N], [X], [Your name], [Phone].

After the letter is signed, collecting statements is still what stalls the first close. The tax season operator keeps each missing list current and drafts the follow ups, with your staff approving what goes out.

Next step

Want the first request drafted after the letter is signed?

The letter opens the file. Collecting statements still stalls the first close. The tax season operator keeps each missing list current and drafts the follow ups. Your staff approve what goes out. Your CPA reviews and signs every return.

See the tax season operator

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