Yes, it is legal to file taxes for someone else in several defined situations: helping a family member or friend without pay, preparing returns professionally after registering with the IRS, filing for a deceased person as a surviving spouse or personal representative, and signing for a living taxpayer who cannot sign themselves when you hold the right legal authority. What separates lawful help from a federal crime is whether you’re being paid and whether the taxpayer has authorized you.
Helping for Free vs. Getting Paid
Helping a parent, spouse, or friend with their Form 1040 at no charge requires no license, no registration, and no special IRS paperwork. You can collect their documents, enter figures into tax software, and walk them through every line. One rule holds: the taxpayer signs the return themselves, either on paper or by entering their own PIN for an electronic filing. You’re a knowledgeable set of hands, and the IRS has no objection to that.
Accepting money changes the picture completely. Anyone who prepares or assists in preparing a federal tax return for compensation must first obtain a Preparer Tax Identification Number from the IRS.1Internal Revenue Service. PTIN Requirements for Tax Return Preparers The PTIN has to appear in the paid preparer section of every return that preparer completes.2Internal Revenue Service. Frequently Asked Questions: Do I Need a PTIN Federal law requires the identifying number on every return and refund claim a paid preparer touches.3Office of the Law Revision Counsel. 26 USC 6109 – Identifying Numbers The fee to obtain or renew a PTIN is $18.75 for the 2026 filing season.4Internal Revenue Service. IRS Reminds Tax Pros to Renew PTINs for the 2026 Tax Season No exceptions. Money in, PTIN required.
Filing for Someone Who Has Died
A final return is due for anyone who earned income during the year they died, and someone has to sign it. A surviving spouse can file a joint return for the year of death and sign it personally, writing “Filing as surviving spouse” in the signature area and listing themselves as the primary taxpayer.5Internal Revenue Service. Topic No. 356, Decedents If the death happened before the prior year’s return was filed, that one can be filed jointly too.
When a court has appointed a personal representative, that person signs the return, and a copy of the court appointment document has to be attached to the original return.5Internal Revenue Service. Topic No. 356, Decedents
Refunds add one step. A surviving spouse filing an original joint return needs no extra form. Anyone else claiming a refund on behalf of the estate generally must file Form 1310, Statement of Person Claiming Refund Due a Deceased Taxpayer.6Internal Revenue Service. Form 1310, Statement of Person Claiming Refund Due a Deceased Taxpayer A court-appointed personal representative who attaches the court certificate to the original return is also exempt from Form 1310.
Filing for Someone Who Cannot Sign
If the taxpayer is alive but mentally or physically unable to handle their own return, whether you can sign depends on what legal relationship you already hold.
A court-appointed guardian or conservator signs the return in their own name on behalf of the taxpayer, and files Form 56, Notice Concerning Fiduciary Relationship, to notify the IRS of the arrangement.7Internal Revenue Service. About Form 56, Notice Concerning Fiduciary Relationship
Someone holding a power of attorney granted before the taxpayer became incapacitated can sign on their behalf, attaching a copy of the POA document to the return.
A spouse who is injured or ill can verbally ask the other spouse to sign for them. In that case, the signing spouse writes the incapacitated spouse’s name followed by “By [your name], Husband” or “Wife,” and attaches a dated statement explaining the circumstances.
The IRS Authorization Forms, in Plain Terms
Several IRS forms give another person some level of access or authority over your tax matters. They are not interchangeable, and picking the wrong one is a common mistake.
Form 2848: Power of Attorney
Form 2848 authorizes a specific individual to represent you before the IRS for the tax matters and periods you list on the form.8Internal Revenue Service. About Form 2848, Power of Attorney and Declaration of Representative The representative can receive your confidential information, negotiate with the IRS, and sign agreements. Authorization stays in effect until you revoke it or the representative withdraws.9Internal Revenue Service. Know the Different Types of Authorizations for Third-Party Representatives Not everyone qualifies as a representative. The person must be eligible to practice before the IRS, generally an attorney, CPA, enrolled agent, or another category listed on the form.10Internal Revenue Service. Instructions for Form 2848 – Power of Attorney and Declaration of Representative
Form 8821: Tax Information Authorization
Form 8821 is narrower. It lets someone view and receive your confidential tax information for the years and tax types you specify, but it does not authorize them to advocate your position, sign anything, or represent you.11Internal Revenue Service. About Form 8821, Tax Information Authorization If you want a family member to call the IRS and pull your transcripts without giving them decision-making power, Form 8821 is the right tool.
Third-Party Designee Checkbox
The simplest option sits near the bottom of the Form 1040. Checking the third-party designee box and naming a person lets that person discuss your return with the IRS for that specific tax year. The authorization expires automatically one year from the return’s due date.9Internal Revenue Service. Know the Different Types of Authorizations for Third-Party Representatives It is useful when a preparer needs to answer follow-up questions, and nothing more.
Form 8879: E-File Signature Authorization
When a paid preparer e-files your return, they need your permission to enter or generate your electronic PIN. Form 8879 is that authorization and functions as the declaration document for an e-filed return.12Internal Revenue Service. About Form 8879, IRS e-file Signature Authorization The preparer keeps this form in their records rather than mailing it in, but it has to be completed before the return is transmitted.
Filing Without Authorization
Filing someone else’s return without their knowledge or consent is not a paperwork problem. It is a federal crime. At its worst, using another person’s Social Security number to generate a fraudulent refund is identity theft. Even without intent to steal a refund, an unauthorized filing can produce delayed refunds, IRS notices, and months of untangling for the actual taxpayer.
Anyone who willfully prepares or helps prepare a fraudulent return commits a felony under federal law. The statute sets a base fine of up to $100,000 for individuals and $500,000 for corporations, along with up to three years in prison.13Office of the Law Revision Counsel. 26 USC 7206 – Fraud and False Statements Because the offense is a felony, federal sentencing law allows courts to impose fines of up to $250,000 on individuals when that amount exceeds the statute-specific cap.14Office of the Law Revision Counsel. 18 US Code 3571 – Sentence of Fine
The actual taxpayer remains liable for every dollar of tax, interest, and penalties on the return regardless of who prepared it or whether the preparation was authorized. Failure-to-file penalties alone run 5 percent of unpaid tax per month up to 25 percent, with a minimum penalty of $525 for returns required to be filed in 2026 that are more than 60 days late.15Internal Revenue Service. Topic No. 653, IRS Notices and Bills, Penalties and Interest Charges
If Someone Filed a Return in Your Name
If a return was filed using your information without your consent, submit Form 14039, Identity Theft Affidavit, to alert the IRS and have your account flagged for suspicious activity.16Internal Revenue Service. Reporting Identity Theft To report a specific tax preparer’s misconduct, use Form 14157, Return Preparer Complaint.17Internal Revenue Service. Form 14157, Return Preparer Complaint For broader tax fraud or scam reporting, the IRS directs taxpayers to Form 3949-A, Information Referral.18Internal Revenue Service. Report Tax Fraud, a Scam or Law Violation