Tax preparer engagement letter: what to include

What should a US tax preparer engagement letter include?

An engagement letter is the written agreement that says what you will prepare, for which year, for how much, and where your responsibility stops. For an individual return, most disputes trace back to one of four gaps: an unclear scope, a missing list of client duties, a vague fee, or no exit clause.

At a minimum, a US individual tax engagement letter should cover:

• Parties and tax year. The taxpayer, a spouse if filing jointly, and the tax year, for example the 2026 returns filed in 2027.
• Scope. The federal Form 1040 and the named state and local returns, plus any extension.
• Client responsibilities. Supplying complete and accurate documents, keeping records that support deductions, and reviewing the return before signing.
• Fees and payment. How the fee is set, when it is due, and what happens if it is unpaid.
• E-file authorization. The client signs Form 8879 after reviewing the return, and you do not transmit before you have it.
• Out-of-scope work. IRS notices, examinations, amended returns, bookkeeping and planning, each billed separately if agreed.
• Termination and records. How either side can end the engagement and how records are returned and kept.

None of this is a substitute for advice from your attorney or professional liability insurer, who may have required wording. Treat the checklist below as a review tool for whatever template you use.

Which clauses belong on your engagement letter checklist?

Use this table when you review your 2027 template. The right-hand column is where the rule or risk comes from, so you can check it rather than copy someone else's wording.

Two clauses are often missing from older templates: a data security line and a plain statement that work begins only once the signed letter is back. Both are cheap to add and save arguments later.

Can the engagement letter include section 7216 consent?

Generally, no. Internal Revenue Code section 7216 and the regulations at Treas. Reg. 301.7216 limit how a preparer may use or disclose tax return information. The IRS section 7216 information center notes that final regulations on these consent requirements took effect on December 28, 2012. Some uses need no consent, but others, such as using return information to offer non-tax services, need the taxpayer's written consent.

The format rules sit in Rev. Proc. 2013-14. Per that guidance:

• A consent generally must be its own written document, on paper or electronic, and its text must relate only to the disclosure or use being authorized.
• Consents to disclose and consents to use must be in separate documents.
• Paper consents need at least 12-point type on paper of at least 8½ by 11 inches.
• The taxpayer must sign and date it. Opt-out consents are not allowed, and you may not hand over a form with blanks to fill in later.
• Most consents must start with the sentence beginning “Federal law requires this consent form be provided to you” and say that signing is not a condition of getting tax preparation services.
• Every consent must tell the taxpayer how to report improper use or disclosure to the Treasury Inspector General for Tax Administration.
• If no duration is stated, the consent lasts one year from the date signed.

So the engagement letter can mention that a separate consent may be offered, but the consent itself travels as its own form. The penalties are real: the IRS section 7216 FAQs describe a criminal fine of up to $1,000, up to one year in prison, or both for each knowing or reckless violation, plus a $250 civil penalty under section 6713. If your practice discloses information to preparers outside the US, Rev. Proc. 2013-14 adds longer mandatory wording, so get that consent reviewed.

How does Circular 230 shape the fee and records clauses?

Treasury Department Circular No. 230 governs practice before the IRS, and two of its sections speak directly to engagement letter wording.

Section 10.27: fees

A practitioner may not charge an unconscionable fee. Contingent fees are barred for most IRS matters, and Circular 230 defines them to include a fee based on a percentage of the refund or of taxes saved. It also counts any promise to refund the fee if a position on the return is challenged. Limited exceptions cover IRS examinations of an original return, certain refund claims about interest or penalties, and judicial proceedings. If your template says anything like “our fee is 10% of your refund,” remove it.

Section 10.28: return of client records

On request, a practitioner must promptly return the client's records needed to meet their federal tax obligations, and may keep copies. A fee dispute generally does not change that. If state law allows records to be held during a fee dispute, you need only return records that must be attached to the return, while giving reasonable access to the rest. Records do not include a return you prepared and are withholding pending payment of the fee for that return. That distinction is why some firms bill before releasing the finished return; our guide to collecting tax prep fees before releasing the return covers that workflow.

Write your records clause to match: originals go back on request, your work product may be held until its fee is paid, and state law may add rules of its own.

Should you renew engagement letters every year or use evergreen letters?

Some templates say the letter continues into future tax years until either side ends or amends it in writing. That evergreen approach saves paperwork, but it carries risk for individual returns.

• Fees change. A rolling letter often quotes last year's fee or a vague “standard rate,” which invites a dispute.
• Scope changes. A client who adds a rental property, a K-1 or a new state is no longer the client the letter described.
• Consents expire anyway. A section 7216 consent with no stated duration lapses after one year, so you are back in touch with the client regardless.

For most firms, an annual letter for individual returns is the cleaner choice: one letter per tax year, sent before the season, with the fee and scope confirmed. Evergreen terms can make sense for ongoing monthly bookkeeping or payroll work, where the service rarely changes. Either way, the letter should be signed before any work starts.

How do you get 400 engagement letters signed before work starts?

Here is a worked example with illustrative figures. A three-preparer firm has 400 individual clients for the 2027 season: 360 returning and 40 expected new. Last season it started work on 55 returns without a signed letter, and four of those ended in fee disputes averaging $650 each, about $2,600 in fees it struggled to collect.

For 2027 it runs the renewal like this:

1. Early December. Update the template: tax year 2026, new fee schedule, a data security line, and a “no work before signature” clause.
2. Mid-December. Send the 360 renewals in three batches of 120, each with the client's name, filing status and quoted fee pre-filled, for e-signature.
3. Reminders. Send an automatic chaser at day 7 and day 14 to anyone who has not signed. Phone the remainder in the first week of January.
4. Gate. Documents can be uploaded, but no preparer opens a job until the letter shows as signed.
5. New clients. Send the letter with the welcome message and the document request, so signing is the first step.

Say 75% of the 360 renewals sign within a week (270), another 15% after the reminders (54) and the calls bring in 30 of the last 36. Add 36 of the 40 new clients, and the firm has about 390 signed letters before tax forms arrive. That leaves a short list of stragglers it can handle one by one, instead of 55 open risks.

Pair the letter with the e-file step. Our guide to Form 8879 e-signature explains remote signing for the authorization itself.

Where do Form 8879 and the Safeguards Rule fit in?

The engagement letter sets expectations; Form 8879 is the authorization. The Form 8879 instructions say the ERO must receive the completed, signed form before the return is transmitted. The ERO keeps it for three years from the return due date or the IRS received date, whichever is later, and does not send it to the IRS unless asked. Say this in your letter so clients know a second signature is coming after they review the return.

On data security, the FTC Safeguards Rule lists tax preparation firms among the businesses it covers. Covered firms need a written information security program and a designated Qualified Individual. They must also notify the FTC within 30 days of discovering a breach involving unencrypted information of at least 500 consumers. A short line in the letter on how documents are exchanged supports that program. Our WISP guide for tax preparers goes further. For anything specific to your firm, check the official guidance or a professional.

How Zaquil handles engagement letter renewals and e-signing

The hard part of engagement letters is not the wording. It is getting hundreds signed in a few weeks and making sure no one starts a return without one. Here is how a tax firm runs that in Zaquil.

Client portal e-signing. The client opens the firm's branded secure portal, reads the 2027 engagement letter and e-signs it. The firm gets a signed PDF certificate on the client record. A section 7216 consent, if the firm offers one, goes out as its own separate document to sign.

Recurring jobs with a checklist. Each client has an annual return job built from a template. The first checklist item is “engagement letter signed,” and the kanban board shows at a glance who is still outstanding.

Automations for chasers. Rules send reminders at day 7 and day 14 to unsigned clients, create a call task for the stragglers, and move the job to document collection once the letter is signed.

Quotes, invoices and locked documents. The client accepts the fee as a quote and pays invoices online. The firm can lock the finished return until the invoice is paid, in line with its records clause.

One inbox. Questions about the fee or scope arrive by email, SMS or WhatsApp in one inbox on the client record, so staff answer them from the same place.

See how this fits a tax practice on the accounting and tax solution page, or check Zaquil pricing: plans from $19 a month, with a 14-day free trial and no credit card needed to start.