Engagement Letters, Form 2848 and Form 8821: What You Sign

When you hire a tax professional you typically sign an engagement letter with the firm and may also sign IRS forms. The engagement letter defines the services and the fee. Form 8879 authorizes e-filing of a return. Form 2848 (Power of Attorney and Declaration of Representative) lets a representative act for you before the IRS, and Form 8821 (Tax Information Authorization) lets a person only receive your information. Knowing which is which keeps you from granting more authority than you intend.

The engagement letter

An engagement letter is a written agreement describing the relationship. It protects both sides. A solid one covers:

Services: the specific returns, years and tasks. For example, "federal Form 1040 and one state return for 2025."
Exclusions: things not included, such as bookkeeping, audit representation, notice response or planning.
Fees: hourly rates, flat fees, retainers, deposits and when payment is due.
Extra charges: extensions, amended returns, additional states, late documents and notices.
Client responsibilities: accuracy and completeness of the information you provide and the date by which you must provide it.
Preparer responsibilities: reasonable inquiries, confidentiality and timelines.
Records: how long the firm keeps records and how you can get yours back.
Termination: how either party ends the engagement and what happens to fees already incurred.

If a letter is missing any of these, ask for a revision. A professional who resists putting the fee in writing is a warning sign, as discussed in red flags and scams.

Clauses to read carefully

Scope limits: a flat fee that covers "preparation" but excludes "responding to correspondence."
Minimum charges: a minimum fee even if the work takes less time.
Interest on late payments: some firms charge it.
Limitation of liability or arbitration clauses: common in professional agreements, but you should understand them.
Data and portal terms: how your documents are stored and shared.

Form 8879: IRS e-file Signature Authorization

When a preparer files your return electronically, you generally sign Form 8879, which authorizes the e-file and confirms you reviewed the return. The preparer keeps it, and it is a reason to review the final return carefully. Do not sign it for a return that is blank or incomplete, and check the refund and bank information before you authorize. If you want a copy of the form, ask for one along with your return.

Form 2848: Power of Attorney and Declaration of Representative

Form 2848 authorizes a CPA, EA, attorney or other eligible representative to act on your behalf with the IRS for specified tax matters and periods. With it, the representative can receive confidential information, speak with the IRS about the matter and often sign agreements. Tips:

List the specific tax form and years, such as "Income, Form 1040, 2023 through 2025." Avoid vague entries like "all years" unless you intend that.
Check the box about whether the representative may receive refund checks. Most people leave this unchecked, and the representative is generally not permitted to endorse or cash them.
You can revoke it at any time.
Representatives must be eligible under IRS rules. A preparer without a CPA, EA or attorney credential may not be allowed to represent you in many situations.

Form 2848 is commonly used for notices, audits, collections and back-tax work. It is typically not needed just to prepare a return.

Form 8821: Tax Information Authorization

Form 8821 allows a named person to inspect and receive your confidential tax information, such as transcripts, for specified years, but it does not authorize that person to represent you or act in your name. A professional may use it to review your IRS records before preparing prior-year returns or planning a resolution. It is narrower than a power of attorney, so it can be a safer starting point.

	Form 8879	Form 2848	Form 8821
Purpose	Authorize e-filing a return	Authorize representation before the IRS	Authorize access to information
Signs for you?	Authorizes submission of that return	Yes, for specified matters	No
Typical use	Every e-filed return	Notices, audits and collections	Reviewing transcripts and records
Time frame	That return	Periods you list	Periods you list

The IRS Online Account and transcripts

You can create an IRS Online Account to see your own balance, payments and transcripts. Some professionals request an authorization through the IRS tax pro account system for returning clients, which has its own process. The details change, so confirm on IRS.gov what is current when you sign.

State forms

States have their own authorization forms. If your preparer will speak with a state tax agency, expect a separate form. Ask whether it is needed for your state.

Understanding your own responsibility

Signing a form does not remove your responsibility for the content of your return. The return is yours, and the IRS expects the information to be accurate and complete. A preparer who signs is also responsible for their work, but you cannot avoid penalties by saying a professional made the error. In some cases, reasonable reliance on competent advice can help in a penalty abatement request, but it depends on the facts.

A practical sequence for new clients

Receive the engagement letter. Read it and ask questions.
Sign and return it with a deposit if required.
Send the documents securely.
Review the draft return.
Sign Form 8879 when you are satisfied.
If an IRS matter exists, sign a Form 2848 limited to specific forms and years.
Keep copies of everything.

Frequently asked questions

Do I need a Form 2848 for a regular return?

Usually no. It is for representation before the IRS on specific matters, such as notices or audits.

Can a preparer cash my refund check?

Generally no. Representatives are not permitted to endorse or negotiate refund checks, and you should deposit refunds into your own account.

How do I cancel a Form 2848?

You can revoke by sending a written statement to the IRS, or by filing a new form that replaces the earlier one. Check IRS.gov for current instructions.

Is an engagement letter legally binding?

It is a contract and usually binding. Read it as you would any contract, and ask for changes before you sign.

Sources

Internal Revenue Service — forms 2848, 8821 and 8879 and their instructions
National Association of State Boards of Accountancy — resources about professional standards for CPAs
Taxpayer Advocate Service — assistance with IRS problems

This article is general information and not legal or tax advice.