Yes, it is legal to file taxes for someone else, but what you need in order to do it depends on two things: whether you’re being paid, and what legal relationship you have with the person whose return you’re filing. A friend helping a parent at the kitchen table operates under one set of rules; a paid preparer operates under another; an executor filing for a deceased relative operates under a third. Get the category right and the paperwork is straightforward.
Helping for Free
If you’re preparing a return for a family member or friend without charging them, you don’t need a license, a registration number, or IRS permission. You can gather their documents, work through tax software with them, and talk them through every line of the return. The one firm rule is that the taxpayer has to sign for themselves, either on paper or by entering their own PIN for an e-filed return. You’re acting as helpful hands, not as the filer of record.
Preparing Returns for Pay
The moment money changes hands for the work, the rules shift. Anyone who prepares or helps prepare 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 That number has to appear in the paid preparer section of every return the preparer touches.2Internal Revenue Service. Frequently Asked Questions: Do I Need a PTIN Federal law requires it on every return and refund claim.3Office of the Law Revision Counsel. 26 USC 6109 – Identifying Numbers The PTIN fee is $18.75 for the 2026 filing season.4Internal Revenue Service. IRS Reminds Tax Pros to Renew PTINs for the 2026 Tax Season There are no exceptions. If you accept payment, you need the number.
Being paid also raises what the IRS expects of you on accuracy. Paid preparers are expected to exercise due diligence: asking the right questions, reviewing supporting documents instead of taking the client’s word, and flagging things that don’t add up. Civil penalties for understating a client’s tax liability start at $1,000 or 50 percent of the preparer’s fee for the return (whichever is greater) for positions that lack a reasonable basis, and jump to $5,000 or 75 percent of the fee for willful or reckless conduct.5Office of the Law Revision Counsel. 26 US Code 6694 – Understatement of Taxpayers Liability by Tax Return Preparer Those penalties fall on the preparer personally. The taxpayer still owes any additional tax, interest, and penalties on the return itself.
Filing for a Deceased Person
A final return is due for anyone who had income in the year they died, and someone has to file it. The rules depend on who you are in relation to the decedent.
A surviving spouse can file a joint return for the year of death and sign it as the primary taxpayer, writing “Filing as surviving spouse” in the signature area.6Internal Revenue Service. Topic No. 356, Decedents If the death happened before the previous 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 attaches a copy of the court appointment document to the original filing.6Internal Revenue Service. Topic No. 356, Decedents If the return produces a refund, a surviving spouse filing an original joint return needs nothing extra to claim it, and a court-appointed personal representative who already attached the court certificate is also covered. Anyone else claiming a refund on behalf of the estate generally has to include Form 1310, Statement of Person Claiming Refund Due a Deceased Taxpayer.7Internal Revenue Service. Form 1310, Statement of Person Claiming Refund Due a Deceased Taxpayer
Filing for a Taxpayer Who Cannot Sign
If the person is alive but can’t manage their own return because of illness, injury, or incapacity, the path depends on the legal authority you 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 put the IRS on notice of the arrangement.8Internal Revenue Service. About Form 56, Notice Concerning Fiduciary Relationship
- Someone holding a power of attorney granted before the taxpayer’s incapacity can sign on the taxpayer’s behalf and should attach a copy of the POA document to the return.
- A spouse whose husband or wife is injured or ill and verbally asks them to sign can sign the absent spouse’s name followed by “By [your name], Husband” or “Wife,” with a dated statement explaining the circumstances attached to the return.
The IRS Authorization Forms, and Which One You Actually Need
If what you want is permission to deal with the IRS on someone else’s behalf (not to prepare or sign their return), the IRS has separate forms for separate levels of access. Choosing the wrong one is a common mistake because each does something different.
Form 2848, Power of Attorney and Declaration of Representative
Form 2848 authorizes someone to represent you before the IRS for the specific tax matters and periods you list.9Internal Revenue Service. About Form 2848, Power of Attorney and Declaration of Representative That representative can see your confidential information, negotiate on your behalf, and sign agreements. The authorization lasts until you revoke it or the representative withdraws.10Internal Revenue Service. Know the Different Types of Authorizations for Third-Party Representatives Not everyone qualifies. The representative generally has to be an attorney, CPA, enrolled agent, or another professional category listed on the form.11Internal 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 name, but it does not authorize them to advocate your position, sign anything, or represent you.12Internal Revenue Service. About Form 8821, Tax Information Authorization This is the right form when you want a relative to call the IRS and get copies of your transcripts without having authority to make decisions for you.
The Third-Party Designee Checkbox
The simplest option is the checkbox near the bottom of Form 1040. Checking it and naming someone lets that person discuss the return with the IRS for that tax year. The authorization expires one year after the return’s due date.10Internal Revenue Service. Know the Different Types of Authorizations for Third-Party Representatives Useful when a preparer needs to answer IRS follow-up questions, but far short of the broader representation Form 2848 provides.
Form 8879, IRS e-file Signature Authorization
When a paid preparer e-files your return, Form 8879 is how you authorize them to enter or generate your electronic PIN. It functions as the signature declaration for the e-filed return and has to be completed before the return is transmitted.13Internal Revenue Service. About Form 8879, IRS e-file Signature Authorization The preparer keeps it in their records rather than sending it to the IRS.
When Filing for Someone Else Becomes a Crime
Filing a return in another person’s name without their knowledge or consent crosses from tax law into criminal law. At the extreme, this is identity theft: using someone’s Social Security number to generate a fraudulent refund. Even without a theft motive, filing without authorization can delay the real taxpayer’s refund, trigger confusing IRS notices, and take months to untangle.
Willfully preparing or helping to prepare a fraudulent return is a federal felony. The statute sets a fine of up to $100,000 for individuals and $500,000 for corporations, plus up to three years in prison.14Office of the Law Revision Counsel. 26 USC 7206 – Fraud and False Statements Because the offense is a felony, federal sentencing law lets courts impose fines of up to $250,000 on individuals when that exceeds the tax-code figure.15Office of the Law Revision Counsel. 18 US Code 3571 – Sentence of Fine
The actual taxpayer is still on the hook for the tax, interest, and penalties on their return, no matter who prepared it or whether that 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.16Internal Revenue Service. Topic No. 653, IRS Notices and Bills, Penalties and Interest Charges
If someone filed using your information without permission, submit Form 14039, Identity Theft Affidavit, to flag your account for suspicious activity.17Internal Revenue Service. Reporting Identity Theft To report misconduct by a specific preparer, use Form 14157, Return Preparer Complaint.18Internal Revenue Service. Form 14157, Return Preparer Complaint For broader tax fraud reports, the IRS directs taxpayers to Form 3949-A, Information Referral.19Internal Revenue Service. Report Tax Fraud, a Scam or Law Violation