Why does a CPA engagement letter matter?

It records the services the firm agrees to provide, the information you must provide, the fee arrangement, deadlines, and important limits or exclusions.

Should bookkeeping be included in a tax engagement?

Only if the letter says so. Tax preparation, bookkeeping, payroll, advisory work, and financial statement services are separate scopes unless expressly included.

What should I do if I do not understand a limitation?

Ask the CPA to explain the effect in plain language and request any agreed clarification in writing before signing.

What to Review in a Small-Business CPA Engagement Letter

October 3, 2026 · Small business guide · 2 min read

An engagement letter translates a CPA firm's proposal into the working agreement. Read it before sending sensitive records or assuming the firm will handle a task. The name “CPA services” can cover very different combinations of tax, bookkeeping, payroll, reporting, and advisory work.

Check the covered services

Look for the exact returns, periods, entities, locations, and deliverables included. Confirm whether bookkeeping cleanup, payroll filings, sales tax, financial statements, tax planning, notices, or year-round questions are covered. If the letter excludes work you expected, ask for a revised scope and price.

Understand your responsibilities and timing

Review which records you must provide, in what format, and by what dates. Ask what happens if information arrives late or is incomplete. Confirm who reviews the work, how questions are routed, when drafts are available, and how filing authorization is obtained.

Make fees and extra work predictable

Identify fixed, hourly, recurring, or per-return charges and whether fees can change. Ask how the firm prices notices, amended returns, additional states, corrected books, and work caused by late or revised information. Confirm deposit, billing, and payment timing.

Review limits, data handling, and termination

Understand what the firm is not promising, how confidential information is handled, how records are returned, and how either party can end the engagement. Clarify whether the firm can represent you in an examination or only prepare filings; these responsibilities can depend on credential and authorization.

Ask for plain-language clarification

Before signing, write down the tasks you expect and compare them with the letter line by line. IRS guidance says small businesses should understand a professional's qualifications, fees, and availability, and review a return before signing. See the IRS small-business selection guide. Find firms in our CPA directory and compare written scopes.

Frequently Asked Questions

Why does a CPA engagement letter matter?: It records the services the firm agrees to provide, the information you must provide, the fee arrangement, deadlines, and important limits or exclusions.
Should bookkeeping be included in a tax engagement?: Only if the letter says so. Tax preparation, bookkeeping, payroll, advisory work, and financial statement services are separate scopes unless expressly included.
What should I do if I do not understand a limitation?: Ask the CPA to explain the effect in plain language and request any agreed clarification in writing before signing.