How to Correct a Tax Return You've Already Submitted

Yes, you can amend a return after you file, but the IRS has specific forms and deadlines

You can change a tax return you've already submitted to the IRS. The tool for this is Form 1040-X, Amended U.S. Individual Income Tax Return. You file it with the IRS the same way you filed your original return — by mail or through tax software that supports amended returns. The IRS will process it and issue a new notice of assessment, which updates your tax record.

You have three years from the date you filed your original return (or three years from the tax deadline, whichever is later) to file an amended return and claim a refund. If you owe additional tax, you can file an amended return at any time, though the IRS will charge interest and penalties on the unpaid amount from the original due date.

Key Takeaways

File Form 1040-X to amend a return you've already submitted; you can do this by mail or through tax software that supports amended returns.
You have three years from when you filed (or from the tax deadline, whichever is later) to amend and claim a refund.
If you owe additional tax, you can file an amended return anytime, but interest and penalties apply from the original due date.
The IRS processes amended returns in the order they arrive; expect four to six weeks for processing, longer during tax season.
Do not file the same amended return more than once; multiple filings can delay processing and create confusion with the IRS.

What goes on Form 1040-X and what you need to gather

Form 1040-X asks you to report the original amounts from your filed return, the corrected amounts, and the difference. You only report the lines that changed — you do not resubmit your entire return. For example, if you forgot to report income from a 1099 form, you would enter the original income amount, the corrected amount (original plus the missed income), and the difference.

Gather the documents that support the change: a corrected W-2 or 1099 form, receipts for deductions you missed, proof of a dependent you forgot to claim, or documentation of a life event that changes your filing status. You do not send these documents with Form 1040-X unless the IRS asks for them, but you should keep them in case you are contacted.

If you are amending because you received a corrected form from an employer or financial institution, wait until you have that form in hand before filing. The IRS matches your return against the forms employers and banks file, and filing before you have the corrected form can create a mismatch that triggers an IRS notice later.

How to file your amended return by mail or software

If you file by mail, print Form 1040-X, fill it out by hand or type it, and mail it to the IRS address for your state. The address appears on the form itself and varies by location. Include a copy of the pages of your original return that changed, and include payment if you owe additional tax. Mail it certified with return receipt so you have proof of delivery.

If you use tax software, many programs that prepare returns also prepare amended returns — TurboTax, H&R Block, and TaxAct all offer this. You enter your original return information, make the corrections, and the software generates Form 1040-X for you. You can then file electronically, which is faster than mail. Not all software supports e-filing amended returns, so check before you buy or start.

Do not file Form 1040-X more than once for the same tax year and the same issue. If you realize you made an error on your amended return, file a second amended return (another Form 1040-X) that corrects the first one. The IRS processes these in order, and filing duplicates slows down processing and can create errors in your account.

Processing time and what to expect from the IRS

The IRS processes amended returns in the order they arrive. During the filing season (January through April), expect four to six weeks. Outside filing season, processing can take eight to twelve weeks. You will not receive a confirmation that your amended return arrived; the IRS simply processes it when it reaches the front of the queue.

Once the IRS processes your amended return, you will receive a new Notice of Assessment (Form 1040-X) in the mail. This notice shows the changes the IRS made to your account and your new tax liability or refund amount. If the IRS disagrees with a change you made, they will send you a separate notice explaining the issue and asking for more information or payment.

If you filed an amended return claiming a refund and the IRS approves it, the refund will be issued by check or direct deposit, depending on how you requested it. If you owe additional tax, the IRS will bill you. You can pay online through IRS.gov, by mail, or by phone.

Reasons you might need to amend and common mistakes

The most common reasons to amend are: you forgot to report income from a 1099 form, you missed a deduction you are may have access to to, you claimed a dependent incorrectly, your filing status changed, or you received a corrected W-2 or 1099 from your employer or a financial institution. You might also amend if you made a math error, claimed the wrong tax credit, or reported income on the wrong line.

A frequent mistake is amending too quickly. If you filed your return and then immediately realized an error, wait a few days before filing the amended return. The IRS's systems take time to record your original return, and filing an amended return before the original is fully recorded can create processing delays.

Another common issue is amending when you should not. If the IRS has already contacted you about your return, do not file an amended return without talking to them first. If you file an amended return while the IRS is reviewing your original return, you may create confusion and delay resolution. Contact the IRS using the number on the notice they sent you.

What happens if you miss the three-year deadline

If three years have passed since you filed your original return (or three years from the tax deadline, whichever is later), you cannot file an amended return to claim a refund. The IRS will reject it. However, you can still file an amended return to report additional tax you owe, though interest and penalties will apply from the original due date.

If you are past the deadline and you are owed a refund, you have limited options. You can file Form 1040-X anyway and include a letter explaining why you are filing late; the IRS may consider it, but they are not required to. Some situations — such as a casualty loss or a bad debt deduction — have different time limits, so if your situation is unusual, contact the IRS or a tax professional before giving up.

Frequently Asked Questions

How long does it take to get a refund after I file an amended return?

The IRS processes amended returns in the order they arrive, which takes four to six weeks during filing season and eight to twelve weeks outside filing season. Once processed, a refund is issued by check or direct deposit within two to three weeks. Total time from filing to receiving the refund is usually six to ten weeks, longer during peak season.

Can I file an amended return if the IRS is already auditing me?

Do not file an amended return while the IRS is auditing your original return. Contact the IRS agent or office handling your audit first. Filing an amended return can complicate the audit and delay resolution. The IRS will tell you whether amending is appropriate in your situation.

What if I amend my return and the IRS disagrees with my changes?

The IRS will send you a notice explaining what they disagree with and asking for more information or payment. You can respond to the notice by mail or by phone using the number on the notice. If you disagree with the IRS's decision, you have the right to appeal through the IRS Appeals process.

Do I need to amend if I received a corrected W-2 or 1099 after I filed?

You should amend if the corrected form shows income or withholding that is significantly different from what you reported. If the difference is small or the IRS will catch it anyway when they match your return against the forms your employer filed, amending may not be necessary. When in doubt, amend to avoid an IRS notice later.

Can I file an amended return for a year the IRS has already audited and closed?

Yes, you can file an amended return for a closed year, but the IRS will not reopen the audit unless you have new information or evidence that changes the outcome. If you discover an error after an audit is closed, file Form 1040-X and include a letter explaining the situation. The IRS will decide whether to reopen the case.

This guide is for general information only and is not medical, financial, legal, or other professional advice. For decisions specific to your situation, consult a qualified professional. See our Editorial Policy.