Practice management

Engagement letter

An engagement letter is the written agreement between an accounting firm and a client. It sets the services the firm will provide, the fee, the client's responsibilities, the records the client will provide and the limits of the engagement.

Reviewed November 3, 2026

Why it matters

The engagement letter is the record of what the firm agreed to do. It reduces the chance of a scope dispute and gives the firm a written basis for asking for the records it needs.

Example

Before the first monthly close, the client signs an engagement letter that names the bookkeeping services, the monthly fee and the client's responsibility to send the bank statements by the 10th.

Related terms

Questions about Engagement letter

Can an engagement letter be signed electronically?

Yes, if the firm keeps a record of who signed, when and the exact text. Many firms send the letter through an e-signature tool and keep the signed copy with the engagement file.

Sources

Checked November 3, 2026. Public pages and tax rules change; confirm them before relying on them.

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