Tax planning proposal template or engagement letter?

For most planning engagements, you don't need a long tax planning proposal template. Send the engagement letter the same day as the meeting, with two or three scope options inside it, so the owner can choose and sign in one step.

Use a separate proposal only when the work is large or unusual, such as several entities or a business sale, and the scope needs agreeing before you can write the letter. Either way, the engagement letter is the document that matters. This guide covers what goes in each and the Circular 230 points the letter should handle.

The difference in one line each

A proposal describes what you'd do and what it costs. It helps the owner choose. It isn't the agreement.
An engagement letter is the agreement: scope, fee, responsibilities and terms, signed by both sides.

Why a long proposal slows things down

A long proposal sent days after the meeting gives the owner time to cool off and something to "review with my partner." Then nothing happens, and you're chasing a document.

A letter sent the same afternoon, while the meeting is fresh, with the options you discussed, asks for one decision. If the owner wants changes, you change the letter.

When you do need a proposal

Several entities or owners, with scope that depends on what you find
A sale, merger or new partner, where timing isn't settled
An owner who asks for a written comparison of options before deciding

Keep it to one or two pages: what you heard, the decisions to settle with dates, two or three scope options with fixed fees, and the next step.

A one-page tax planning proposal template

What you told us. Two or three lines in the owner's words.
The decisions to settle. Each with a date, such as the next estimated payment or a Form 2553 deadline.
Options. Two or three scopes, each with a fixed fee.
What's not included. Return preparation, implementation or anything else you'll quote separately.
Next step. "Reply with your choice and we'll send the engagement letter today."

See if your firm is a fit

What the engagement letter should cover

Talk to your professional liability insurer or counsel about your letter. These are the points Circular 230 speaks to directly.

Scope and what's excluded

Name the tax years, entities and owners covered, the deliverables and the dates. List what isn't included. A plan for the business isn't a plan for the owner's personal investments unless you say so.

Fees

State the fee, when it's due and what happens if scope changes. Circular 230 section 10.27 bars unconscionable fees and, outside narrow exceptions, contingent fees, which include a fee based on a percentage of taxes saved and any arrangement to reimburse the fee if a position is challenged (31 CFR 10.27). Check that no clause in your letter reads that way.

The client's facts

Say that the plan relies on information the client provides, and that you'll ask follow-up questions where something looks wrong. Section 10.34(d) lets you generally rely in good faith on client information, but requires reasonable inquiries if it appears incorrect, inconsistent or incomplete (31 CFR 10.34).

Penalties

Say you'll explain any penalties reasonably likely to apply to positions you advise on. Section 10.34(c) requires a practitioner to inform a client of penalties reasonably likely to apply to a position they advised on or a return they prepared or signed, and of any chance to avoid them by disclosure (31 CFR 10.34).

Written advice

Your written plan is written advice. Section 10.37 says it must rest on reasonable factual and legal assumptions and relate the law to the facts (31 CFR 10.37). Saying in the letter what the plan is based on protects both sides.

Records

Say how records come back at the end. Section 10.28 says a practitioner must, at the client's request, promptly return records the client needs to comply with federal tax obligations, and a fee dispute generally doesn't change that (31 CFR 10.28).

Conflicts

If you advise more than one owner, or spouses, say how conflicts are handled. Where a conflict exists, section 10.29 lets you proceed only if you reasonably believe you can represent each affected client competently and diligently, the law doesn't prohibit it, and each affected client gives informed consent, confirmed in writing no later than 30 days after the consent. Copies are kept for at least 36 months after the representation ends (31 CFR 10.29).

Data and authorizations

Say how documents will be shared and protected. The FTC Safeguards Rule covers tax preparation businesses (16 CFR 314.2). If you'll need to see IRS records, say which authorization you'll ask for. Form 8821 lets a taxpayer authorize you to inspect or receive their confidential tax information (IRS, about Form 8821). Form 2848 is the power of attorney if you'll represent them (IRS, about Form 2848).

Term

A start date, an end date and how renewal works.

When an owner goes silent after the letter

Send one short note two business days later: "Just checking the letter came through. Any questions on the options?" If there's no reply after another few days, send a final note leaving the door open, and stop. Don't send a revised, cheaper letter nobody asked for.

What our marketing has taught us about written terms

We run marketing that fills tax firms' calendars with qualified planning meetings, and we work from written terms ourselves.

Qualified is defined in writing before we start. At kickoff, the firm signs off on what a qualified meeting means for it. A qualified meeting is one where a business owner we've qualified books onto your calendar and shows up.
The full terms are in the service agreement, which the firm reads before signing anything.

The lesson for your own engagements: agree the definition of done before the work starts, in writing.

Where to start this week

Turn your proposal into a one-page template with fixed-fee options.
Check your engagement letter against the headings above.
Remove any fee wording tied to savings or refunds if a position is challenged.
Set up a same-day send after every planning meeting.
Ask your insurer or counsel to review the letter.

Questions firm owners ask

What is the difference between a proposal and an engagement letter? A proposal describes what you'd do and what it costs so the owner can choose. An engagement letter is the signed agreement that sets scope, fee, responsibilities and terms.

Do I need a tax planning proposal template? For most planning engagements, no. Send the engagement letter the same day with two or three scope options. Use a short proposal for large or uncertain work, such as several entities or a business sale.

What should a tax planning engagement letter include? Scope and exclusions, fees, reliance on client information, how penalties are explained, the basis for written advice, return of records, conflicts, data handling and authorizations, and the term.

Can an engagement letter promise to refund the fee if the IRS challenges a position? Circular 230 section 10.27 treats an arrangement to reimburse the fee if a position is challenged or not sustained as a contingent fee. Outside narrow exceptions, practitioners may not charge contingent fees.

Sources

General information from the official sources listed below, checked 25 Oct 2026. Not tax or legal advice.

If you'd rather have qualified owners booked for you

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Johnny Logan, Founder, Financial Sales Insider.

Financial Sales Insider · Florida · (305) 513-1710