Engagement Letter Format for Chartered Accountants

"But I thought that was included." Every professional office has heard it, usually when nobody can find anything in writing. This guide gives you an engagement letter format for chartered accountants that any CA, CS, CMA or tax consultant's office can use: why every job needs one, the ten section headings every letter should have, how to get it accepted, and what changes when the job is an audit.

A good engagement letter is short. One or two pages, plain words, sent before the work starts. It protects the client as much as it protects you.

Why every job needs an engagement letter

Many small offices skip the letter for "simple" work, like a yearly return or monthly bookkeeping. That is exactly where fee arguments start, because simple work has the most assumptions on both sides.

• The fee is agreed before the work, not argued about after it.
• Extra work is clearly extra, so you can quote for it without awkwardness.
• The client knows their own duties: documents, dates and approvals.
• If a question comes up later, you can show what you were asked to do, and what you were not.

What is not written down is remembered differently by each side. A letter takes ten minutes to prepare from a template. A fee dispute can take months and cost you the client.

The real reason most offices skip it is not laziness. It is that nobody has a ready letter for each service, and drafting one from a blank page during the busy season never happens.

Engagement letter format for chartered accountants: the 10 sections

Use these ten headings for any non-audit service. Keep each section to a few lines, so the whole letter fits on one or two pages.

1. Parties and date
2. Scope
3. Deliverables
4. Not included
5. Client duties
6. Timelines
7. Fees
8. Payment terms
9. Confidentiality, records and limits
10. Term, ending and acceptance

The order matters. Scope and "Not included" come before fees, so the client reads what the fee pays for before they read the number. Client duties come before timelines, so your delivery date is visibly linked to their documents arriving.

What a good letter does, and does not do

Headings alone do not make a good letter. The wording inside them does. Three tests tell you if a letter will protect you when a question comes up a year later.

• It does not promise outcomes. It says what you will do, not what result the client will get.
• It does not say "all accounting work". It names the work, the period and the output, so there is nothing to stretch.
• It links every deadline of yours to a duty of the client's. "Within ten working days of complete documents" is fair. "By the 15th" is a promise you cannot control.

Tone matters too. A letter full of legal phrases makes a small business owner nervous. A letter that starts "Thank you for asking us to look after your books. This letter sets out what we have agreed" reads like good service. Plain words, short sentences and the client's own name do more than any clause.

Finally, the letter should end with a clear way to accept it, so you are not left wondering whether the client has agreed. How that acceptance should look depends on the job, which is covered below.

Audits are different: SA 210

For a statutory audit, the terms are not just good practice. SA 210, "Agreeing the Terms of Audit Engagements", issued by ICAI, deals with the auditor's responsibility to agree the terms with management and, where appropriate, those charged with governance. It is effective for audits of financial statements for periods beginning on or after 1 April 2010.

As summarised in ICAI's Checklist on Standards on Auditing, paragraph 10 of SA 210 requires the agreed terms to be recorded in an audit engagement letter or other suitable written agreement, and to include:

• the objective and scope of the audit of the financial statements;
• the responsibilities of the auditor;
• the responsibilities of management;
• the applicable financial reporting framework; and
• the expected form and content of any reports, with a statement that a report may differ from its expected form in some circumstances.

Support work before someone else's audit, such as preparing schedules, is a separate non-audit service. Give it its own letter so the client does not confuse it with the audit.

Getting it accepted and renewed

• Send it before work starts, ideally within two days of the first meeting.
• Accept a clear reply by email or WhatsApp for everyday non-audit work, and save it in the client's folder.
• Check what the job needs. Some engagements need a signed letter: where a law, a standard, a regulator, a bank or the client's board asks for it, or where the stakes are high. A WhatsApp reply never replaces that.
• Check authority. For a company, firm or trust, make sure the person accepting can act for the client.
• Renew every year with the fee revision, in the same format, and whenever the scope changes.

Renewal is where most offices slip. The letter is sent once, in the first year, and never again. Three years later the scope has grown, the fee has not, and the old letter describes a job that no longer exists.

Explain it in one line on the phone: "I have sent a short note with what we will do and the fee, so there is no confusion later. Please reply when you have read it." Most clients appreciate the clarity.

A short note on client data

Your letter is a natural place to tell clients how you handle their personal data. The DPDP Rules 2025, notified on 13 November 2025, bring in a duty to give notice when personal data is processed on consent; that rule starts eighteen months after notification, around mid-May 2027. Rule 3 says the notice must be understandable on its own and written in clear and plain language, listing the personal data and the purpose. Whether a clearly marked section of your letter or a separate one-page notice works better for your office is worth asking a legal adviser. The Act also provides certain legitimate uses, including where a person is obliged by law to disclose information to the State. Ask a legal adviser whether that applies to a particular engagement. For the wider checklist, see Data Security for CA Firms: DPDP-Ready 12-Point Checklist.

Adapting the format to different services

The same engagement letter format for chartered accountants works across services; only the details inside the headings change. Monthly bookkeeping needs the software, the cut-off date for documents and the monthly summary in its scope. A yearly return filing names the year covered and says the work is based on documents the client provides. Company secretarial work names the filings and registers. An advisory job names the question being answered and how the output may be used.

The "Not included" list changes most from service to service, and it is worth taking time over. Think about what clients of that service have asked for "free" in the past, and write it down.

Keep a template for each service you offer regularly, and keep them in one shared folder so the whole office sends the same version. New practices find this hardest, because the first clients arrive before any system is in place, and work starts on a phone call.

Common mistakes to avoid

• One letter for everything. "All tax and accounting work" invites the argument that everything is included. Use one letter per service.
• No "Not included" list. This is where most disputes come from.
• Deadlines without client duties. Your delivery date should depend on complete documents reaching you.
• Fee without payment terms. Say when the bill comes and when it is due.
• Letter sent after the work. By then it looks like a demand, not an agreement.

Most of these mistakes happen not because a partner does not know better, but because staff send old or different versions of the letter, or forget to send it at all.

A clear letter is also the first step in polite fee collection; see How to Ask a Client for Payment Politely: A CA Office Guide. If you are just setting up, How to Start CA Practice in India: A 6-Month Plan and our Starting Your Own CA Practice course cover the other systems to build early.

For the whole client journey, from taking on a new client to the yearly renewal talk, see our course on client handling and fees for professional offices. You can read the first lesson free, and the Office Subscription Plan gives every staff member who deals with clients this course and every other one.

Questions people ask

Sources

• ICAI AASB, Checklist on Standards on Auditing (June 2023 edition): SA 210, Agreeing the Terms of Audit Engagements, scope, effective date, paragraph 10 and paragraph 13 on recurring audits (ICAI PDF)
• ICAI AASB, Illustrative Audit Engagement Letter under the Companies Act, 2013 (17 December 2014)
• Digital Personal Data Protection Rules, 2025, G.S.R. 846(E), 13 November 2025, Rules 1 and 3 (MeitY Gazette PDF)
• Digital Personal Data Protection Act, 2023, sections 4, 5 and 7 (India Code)