Who Has Authority to Sign a Tax Return on Behalf of Another?

Only a narrow set of people can sign a tax return on behalf of another taxpayer: a spouse signing a joint return for an incapacitated husband or wife, a parent or guardian signing for a minor child, a court-appointed fiduciary signing for someone who cannot manage their own affairs, a personal representative signing the final return of a deceased taxpayer, or an agent signing under a valid power of attorney when the taxpayer is medically unable to sign, has been outside the United States for at least 60 continuous days before the due date, or has written IRS permission for other good cause.¹ Every signature is a declaration under penalty of perjury, so both the taxpayer and whoever signs remain on the hook for what the return says.²

When an Agent Can Sign for a Living, Competent Taxpayer

Treasury regulations recognize three grounds on which an agent may sign an individual income tax return:¹

Disease or injury that leaves the taxpayer physically unable to sign.
Continuous absence from the United States, including Puerto Rico, for at least 60 days before the return’s due date.
Other good cause, if the taxpayer requests permission in writing and the IRS approves.

Whichever ground applies, a power of attorney has to travel with the return. Form 2848 does the job, and the IRS also accepts substitute powers of attorney that meet the standards in 26 CFR 601.503(a).³ Helping prepare a return is a different matter: preparers do not need signing authority, because preparing and signing are separate acts.

Signing for an Incapacitated Spouse

When one spouse cannot sign a joint return because of disease or injury, the other spouse can sign for both. The signing spouse writes the incapacitated spouse’s name on the signature line, then adds “By [signing spouse’s name], Husband” or “Wife.”⁴ A dated statement goes with the return giving the form being filed, the tax year, the reason the incapacitated spouse cannot sign, and confirmation that the incapacitated spouse consented.¹

Consent is the pinch point. The incapacitated spouse must give it orally. If that spouse is unconscious or otherwise unable to communicate, this route closes, and a court-appointed conservator or guardian has to handle the return through a fiduciary relationship instead.

Signing for a Minor Child

If a child has enough income to trigger a filing requirement but cannot sign, a parent, guardian, or other legally responsible person signs the child’s name and adds “By [parent or guardian signature], parent or guardian for minor child.”⁴ The adult who signs takes responsibility for the accuracy of the return, including full reporting of the child’s investment income or wages. The same penalties that would apply to an adult’s return apply here.

Signing a Deceased Taxpayer’s Final Return

A personal representative, meaning an executor, administrator, or anyone placed in charge of the decedent’s property, files the final return for the year of death together with any earlier returns that were never filed.⁵ When a court has appointed a representative, that person signs.

The representative should also file Form 56 to formally notify the IRS of the fiduciary relationship. This form tells the IRS where to send notices and establishes the representative’s legal standing to act for the estate. The representative checks the box for whether the decedent left a valid will or died intestate, and attaches letters testamentary or a court certificate as proof of appointment.⁶

If the final return produces a refund, whoever claims it usually needs Form 1310, which asks for the date of death and whether a court has appointed a personal representative.⁷ A surviving spouse filing a joint return for the year of death generally does not need Form 1310. Anyone else claiming the refund does.

Combat Zone Spouses Get an Easier Path

Rules loosen when a spouse is deployed. If your spouse is serving in a combat zone or performing qualifying service outside one, you can sign a joint return for both of you without a power of attorney. You attach a signed statement explaining that your spouse is in a combat zone.⁸

The filing deadline itself also shifts. Most tax deadlines are extended for the entire period of combat zone service plus 180 days after the service member’s last day in the zone. Hospitalization outside the United States for combat zone injuries extends the clock through the hospital stay plus 180 days; hospitalization inside the United States can extend it up to five years.⁹ Many military families never need a representative to sign because they can simply wait and file after the service member returns.

The Form That Actually Grants Signing Authority

Form 2848 is the standard document for authorizing someone to represent you before the IRS, and it is the form most people need when handing over signing authority. Line 3 requires you to list the tax matters covered (income tax, employment tax, and so on), the form numbers, and the exact tax years or periods. Authority applies only to what is listed, so an omitted year is an unauthorized year.³

For your representative to actually sign the return, you have to check the box on line 5a and include a specific statement citing the regulation that permits agent signatures. That statement must identify which of the three qualifying grounds applies: disease or injury, continuous absence from the country, or IRS-granted permission for good cause.³ Without that box checked and that statement attached, the representative can handle IRS matters on your behalf but cannot sign your return. A general power of attorney, even one filed on Form 2848, does not automatically include return-signing authority.

Form 8821 is a common source of confusion here. It authorizes someone to view and receive your confidential tax information for specified years and tax types, and nothing more. The appointee cannot sign documents, represent you, or take any action with the IRS.¹⁰ If you need a signature or negotiation, Form 2848 is the right form.

How the Signature Attaches to the Return

Paper Returns

The signature format depends on the relationship. A spouse signing for an incapacitated spouse writes the spouse’s name followed by “By [signing spouse’s name], Husband (or Wife).” A parent signing for a child writes the child’s name followed by “By [parent’s signature], parent or guardian for minor child.” A court-appointed conservator or fiduciary signing for an incompetent taxpayer signs their own name and files Form 56.¹¹ The power of attorney or supporting documentation goes in the envelope with the return.

Electronic Returns

For e-filed returns, Form 8453 is the transmittal sheet for paper documents that back up the electronic return. If an agent is signing under a power of attorney, that power of attorney must be attached to Form 8453 and mailed to the IRS separately.¹² Only documents listed in Form 8453’s checkboxes belong with it; sending anything else can cause processing problems.

Who Is on the Hook

Both the taxpayer and the agent who signs are responsible for the return as filed. If it contains errors or fraud, both parties can be penalized.¹ Having someone else sign does not shield the taxpayer from interest, penalties, or additional tax.

If a representative or preparer alters the return after the taxpayer authorized it, the taxpayer may be able to avoid liability for the changes, but only by proving what the original return actually said. Keep a copy of the return at the moment you authorize someone to file it. If the IRS later questions the filing, that copy is what lets an investigator sort out who bears responsibility.¹³

An unauthorized signature is a different kind of problem. If someone signs a return without proper authority, the IRS may treat the filing as invalid. That triggers failure-to-file penalties of 5% of the unpaid tax for each month the return remains unfiled, up to a maximum of 25%.¹⁴

Ending Someone’s Authority

Either the taxpayer or the representative can end a power of attorney. To revoke without naming a new representative, write “REVOKE” across the top of the first page of the existing Form 2848, sign and date it below the notation, and mail or fax the annotated copy to the IRS office handling the matter. If you no longer have the original form, send a signed and dated statement declaring the authority revoked, listing the tax matters and years, and naming the representative. To revoke everything, write “revoke all years/periods” in place of a list.¹⁵

A representative withdrawing on their own uses the same mechanics: write “WITHDRAW” across the top, sign and date it, and send it in. Without a copy of the form, the representative sends a signed statement identifying the taxpayer, listing the matters and years, and stating that the authority is withdrawn.¹⁵ Once the IRS has processed the authorization, the representative can also request transcripts, receive notices, and sign agreements or consents on the taxpayer’s behalf, always within the scope written on the form.¹⁶

1
eCFR. 26 CFR 1.6012-1 – Individuals Required to Make Returns of Income
2
Office of the Law Revision Counsel. 28 USC 1746 – Unsworn Declarations Under Penalty of Perjury
3
Internal Revenue Service. Instructions for Form 2848 – Power of Attorney and Declaration of Representative
4
Internal Revenue Service. Publication 4012 – Return Signature
5
Internal Revenue Service. Publication 559 – Survivors, Executors, and Administrators
6
Internal Revenue Service. Instructions for Form 56 – Notice Concerning Fiduciary Relationship
7
Internal Revenue Service. Form 1310 – Statement of Person Claiming Refund Due a Deceased Taxpayer
8
Internal Revenue Service. Publication 3 – Armed Forces Tax Guide
9
Internal Revenue Service. Extension of Deadlines – Combat Zone Service
10
Internal Revenue Service. Preparation of Forms 2848 and 8821 and Their Uses
11
Internal Revenue Service. Publication 4012 – Return Signature
12
Internal Revenue Service. Form 8453 – U.S. Individual Income Tax Transmittal for an IRS e-file Return
13
Taxpayer Advocate Service. Tax Return Preparer Fraud
14
Office of the Law Revision Counsel. 26 USC 6651 – Failure to File Tax Return or to Pay Tax
15
Internal Revenue Service. Instructions for Form 2848
16
Internal Revenue Service. Topic No. 311 – Power of Attorney Information