Engagement letters for accounting firms: what to include, with templates
Download the templates
- Bookkeeping engagement letter (Word) Monthly or quarterly books, cash or accrual, with catch-up terms.
- Tax preparation engagement letter (Word) Individual or entity returns, with section 7216, extension and e-file clauses.
- Tax planning and advisory engagement letter (Word) Written plan, quarterly reviews, projections, with a no-guarantee clause.
Each template marks every item to replace in brackets. They are general templates, not legal advice: have the final wording reviewed by your professional liability carrier and, where required, your state board of accountancy.
Why the letter matters more than it looks
Firms think of the engagement letter as paperwork. Insurers think of it as the first exhibit. When a client disputes a fee, claims you should have caught something, or says a service was included, the letter is what decides it. The AICPA's professional liability program has said for years that most claims against small firms involve either no engagement letter or one that did not cover the service in dispute.
There is a second reason that has nothing to do with disputes. A signed letter is the natural trigger for the engagement: the moment to open the client's portal, send the document list, and put the work on the calendar. Firms that treat the letter as the start button collect documents faster than firms that send it as an afterthought.
What every engagement letter must contain
- The parties. Your firm's legal name and the client's legal name, including the entity for business clients. A letter addressed to "John" for an S corporation's return is a letter with the wrong party.
- Scope. Exactly what you will deliver, by form number and period for tax work, by frequency and deliverable for bookkeeping, by deliverable and meeting cadence for advisory. Then a sentence saying that anything not listed is outside the engagement.
- The client's responsibilities. Providing complete and accurate information by a date, answering questions within a set number of days, reviewing drafts, keeping records, and maintaining their own internal controls. This is the clause that makes late or missing documents the client's problem rather than yours.
- Fees and payment. The amount or the basis, when it is billed, when it is due, what happens on late payment, and what is billed separately (notices, amended returns, catch-up work).
- Limitations. That you are not auditing or verifying the information, that the engagement is not designed to detect fraud, that estimated savings are projections, and that responding to notices or audits is separate.
- Term and termination. When the engagement starts and ends, how either side can end it, and what is owed if it ends early.
- Confidentiality and records. How long you keep working papers, that they are your property, and that original records go back to the client.
- Dispute resolution and limitation of liability. Mediation first, a cap on liability tied to fees, and a time limit for claims. Enforceability varies by state, which is one of the reasons to have a professional review the wording.
- Signatures and date. Both parties, with title for entity signers.
Clauses that differ by engagement type
Tax preparation
- Section 7216. Internal Revenue Code section 7216 restricts how a preparer may use or disclose tax return information. State in the letter that you will use the information only to prepare the returns listed, and that any other use needs separate written consent in the IRS-prescribed form.
- E-file authorization. The returns will not be filed until the client signs Form 8879 or the state equivalent, and the return is considered filed when the taxing authority accepts it.
- Extensions and payment. An extension extends the time to file, not to pay, and estimated payments for the next year are the client's responsibility unless agreed otherwise. Our state tax deadlines pages list the dates and extension rules by state.
- Information cutoff. A date after which information received may require an extension. This is the single most useful sentence in the letter during March.
Bookkeeping
- Basis and frequency. Cash or accrual, monthly or quarterly, and the deliverable package.
- Document deadline and suspense. Records due by a date each month, and a suspense account for unanswered questions so the close does not wait on one transaction.
- No assurance. The statements are for management use and you express no assurance on them.
- Internal controls. Preventing and detecting fraud is the client's responsibility.
- Catch-up work. Priced and paid separately before ongoing services begin.
Tax planning and advisory
- Projections are not guarantees. Savings depend on final figures, implementation and future law.
- Implementation. Who files the election, adopts the plan or changes the payroll. If it is the client, say so.
- Fee not contingent on savings. Contingent fees for tax advice are restricted for many practitioners under Circular 230 and state rules.
- No third-party reliance. The written plan is for the client, not a lender or investor.
Getting it signed
The letter that works is the one the client can sign on a phone in a minute and that opens the portal when they do. In LucaLedger, engagement letters are templates you reuse, sent for e-signature inside your client portal, and the signature creates the organizer, the document requests and the tasks for that engagement. The templates above import as they are.
Frequently asked questions
What is an engagement letter?
An engagement letter is the written agreement between an accounting or tax firm and a client that sets out the scope of the work, each side's responsibilities, the fee, the timing, and the limits of the engagement. It is signed before work begins and renewed for each new engagement or year.
Is an engagement letter a contract?
Yes. Once both parties sign, an engagement letter is a binding contract. That is the point: it is the document a court, an insurer or a board of accountancy reads first when there is a dispute about what the firm agreed to do.
What is the purpose of an engagement letter?
Three things. It sets expectations so the client knows what is and is not included. It protects the firm by documenting scope, reliance on client information and limits of liability. And it starts the engagement: a signed letter is the trigger for collecting documents, opening the portal and scheduling the work.
Do I need a new engagement letter every year?
For tax preparation, yes, one per return year. For bookkeeping and advisory work, an evergreen letter that renews until terminated is common, with a written amendment when scope or fees change. Professional liability carriers generally recommend an annual refresh either way.
What should a tax preparation engagement letter say about IRC section 7216?
That the firm will use the client's tax return information only to prepare the returns in the letter, and that any other use, such as planning or sharing with another adviser, requires the client's separate written consent. Section 7216 restricts use and disclosure of tax return information by preparers, and the consent must meet the IRS's format rules.
Can clients sign engagement letters electronically?
Yes. Electronic signatures are valid under the federal E-SIGN Act and state UETA laws. Capture the signer's name, the signed document, the timestamp and the method, and keep that record with the letter.
Sources: Internal Revenue Code section 7216 and Treasury Regulation 301.7216; IRS Form 8879 instructions; Treasury Department Circular 230; the federal E-SIGN Act (15 U.S.C. 7001). This guide is general information, not legal advice.