---
title: "How to File an Amended Tax Return: Deadlines & Steps (2026)"
description: Learn how to file an amended tax return with Form 1040-X, including the deadline to claim a refund, e-filing rules, and how long it takes.
image: https://blog.cmp.cpa/hubfs/_How%20to%20File%20an%20Amended%20Tax%20Return%20Deadlines%20%26%20Steps%20(2026)-%20Blog%20Cover%20Art%202026.jpg
---
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# How to File an Amended Tax Return: Deadlines & Steps (2026)
July 09, 2021 By [Zach Kimball](https://blog.cmp.cpa/author/zach-kimball)
How to File an Amended Tax Return: Deadlines & Steps (2026)
15:11
*Updated Sep 24, 2026*
*Originally published Jul 9, 2021*
Filing your federal income tax return can be stressful even when your taxes are straightforward. But what happens when you find something you need to change on a return you already filed? The short answer: you file an amended tax return with the IRS.
# Key Takeaways
- You file an amended return on Form 1040-X to correct something on a return you already filed, such as your filing status, income, deductions, or credits.
- You can e-file Form 1040-X for the current tax year and the two years before it. Older years, and any return you originally filed on paper, have to be amended on paper.
- To claim a refund, you generally have three years from the date you filed the original return, or two years from the date you paid the tax, whichever is later.
- Most amended returns take about 8 to 12 weeks to process, and sometimes up to 16.
- You usually don't need to amend for a math error or a missing form or schedule. The IRS may correct the error or contact you for the missing document. You should amend if the missing information changes your income, deductions, credits, or tax liability.
At CMP, we work with our clients to make sure their taxes are filed accurately and on time. Even so, things come up, and sometimes an amendment is the right fix. In this post, we explain how and when to file one.
-%20Blog%20Cover%20Art%202026.jpg?width=978&height=505&name=How%20to%20File%20an%20Amended%20Tax%20Return%20Deadlines%20%26%20Steps%20(2026)-%20Blog%20Cover%20Art%202026.jpg)
## What is an Amended Tax Return?
The possibility of making an error on your federal tax return may be something you haven't considered, but it's important to know what happens if you do. The best remedy is to file an [amended tax return with the IRS](https://www.irs.gov/newsroom/what-taxpayers-should-know-about-amending-a-tax-return). An amended return allows you to make one or more changes to your original tax return.
Some of the most common reasons to file an amended return include:
- A change in your filing status (for example, [married filing separately to married filing jointly](https://blog.cmp.cpa/married-filing-jointly-vs-separately))
- A change in your income (you forgot to report some)
- A[tax credit](https://blog.cmp.cpa/tax-credit-vs-deduction) taken in error or missed when you should have claimed it
- A tax deduction taken in error or missed
You'll want to be careful when you file. We walk through the steps below, but the short version is that you need the right IRS form, all your supporting documentation, and to follow the IRS rules for amending.
## How an Amended Return Works
When you[file your individual income tax return](https://cmp.cpa/services/income-tax-services/), you either pay what you owe or figure your refund, and you submit any supporting documents along with it.
An amended return works a little differently, and the biggest difference is how and when you can file electronically. You can e-file [Form 1](https://www.irs.gov/pub/irs-pdf/f1040x.pdf) for the current tax year and the two tax years before it. For any year older than that, you file on paper. One rule catches people off guard: A prior-year return originally filed on paper generally must also be amended on paper, even if the year still falls within the e-file window.
If your original return included a refund, wait until the IRS has processed the return and issued the refund before filing an amendment for an additional refund. Any additional refund from the amendment will be handled separately. If the amendment shows that your original refund was too large, don't spend the excess amount.
An amended return usually takes about 8 to 12 weeks to process, and sometimes up to 16. You can track it online whether you filed electronically or by mail.
Do you want to get more value for your money when it comes to healthcare? A health savings account (HSA) is a great way to invest for future healthcare costs and can help make your cash go further. Check out our blog post: [Using HSA Triple Tax Advantage To Save On Your Taxes](https://blog.cmp.cpa/hsa-triple-tax-advantage).
## When to File an Amended Return
So when do you actually need to amend, and when can you leave it alone? Start with the cases where an amendment is necessary:
- You used the wrong filing status and need to change it. (If filing status is where things went sideways, our guide on[how to fill out a W-4 form](https://blog.cmp.cpa/how-to-fill-out-w4-form) walks through the options.)
- You misreported your income, whether you overstated it or left out[income from a side gig](https://blog.cmp.cpa/tax-guide-for-gig-economy-workers-dos-donts) or an investment account.
- You took a credit or deduction in error.
- You missed a credit or deduction you were entitled to.
In other words, anything that changes the substance of your return, rather than a slip the IRS fixes on its own, calls for an amendment. If you forgot to claim the[Child Tax Credit](https://blog.cmp.cpa/child-tax-credit) or to report profit from a rental or other[passive income](https://blog.cmp.cpa/passive-income-tax), for example, you'll need to file one.
Now, the cases where you don't need to amend. Skip it if you:
- Made a math error. The IRS corrects the math for you.
- Forgot to attach a form or schedule. The IRS will write to you and ask for it.
The pattern is simple: the IRS handles the procedural stuff, and you handle anything that changes your taxable income or your tax liability.
**CPA Insight:**
When you're deciding whether something is worth amending, weigh the change against the effort. A small dollar swing that lands in your favor may not be worth the filing and the wait, but anything that changes what you owe, affects a credit, or could surface in a future IRS notice is worth correcting. If you're not sure which side of that line you're on, a quick review with a CPA is cheaper than guessing wrong.
## How to File an Amended Tax Return
Filing an amended return isn't hard, but a few rules are worth knowing. As mentioned above, you can e-file Form 1040-X for the current year and the two years before it; older years must be filed on paper.
Here are the steps:
1. Make sure the IRS has processed your original return first. This keeps your original from getting confused with the amendment.
2. Gather your documentation. You'll need a copy of your original return plus anything that supports the change, such as an amended W-2, a 1099 that arrived late, or a form backing up a deduction you missed.
3. Get the right forms. Every amendment needs Form 1040-X, and depending on what you're changing, you may also need:
- Schedule A, if you're changing itemized deductions.
- Schedule B, for changes to interest or dividend income.
- Schedule C and Schedule SE for changes to business income or expenses.
- [Form 8949](https://blog.cmp.cpa/how-to-fill-form-8949) and Schedule D, for changes to[capital gains](https://info.cmp.cpa/minimize-cap-gain-tax) and losses.
4. Complete Form 1040-X. You'll put the figures from your original return in Column A, the changes in Column B, and the corrected totals in Column C. The IRS has full line-by-line[instructions for Form 1040-X](https://www.irs.gov/instructions/i1040x).
5. File it. If you're amending the current year or one of the two years before it, and you filed that original return electronically, you can e-file. Otherwise, print Form 1040-X and any related forms and mail them.
6. Handle payment or refund. If you owe, include your payment with the filing, since paying right away limits interest and penalties. If you're due a refund, you can e-file with direct deposit to get it faster or wait for a mailed check.
File a separate Form 1040-X for each tax year you're correcting. You can't combine multiple years on one form.
## Amending vs. Refiling: What's the Difference?
A common point of confusion is whether you should "*refile*" your taxes or amend them. You don't refile. Once the IRS has accepted your original return, you can't submit a fresh one over the top of it. What you do next depends on the timing:
| Situation | What you file | When it applies |
| --- | --- | --- |
| You catch the error **before** the filing deadline | A superseding return (a corrected original) | It replaces your original return entirely |
| You catch the error **after** the filing deadline | Form 1040-X (an amended return) | It reports what changed, rather than replacing the return |
| The IRS has already accepted your return | Not a duplicate original | Filing another plain return won't work; you supersede (before the deadline) or amend (after) |
**CPA Insight:**
If you need to fix more than one year, file a separate Form 1040-X for each. The IRS lets you e-file up to three amended returns per tax year, but each year is its own filing. Bundling several years onto one form will get the whole thing rejected.
## Is There a Deadline to File an Amended Tax Return?
The IRS has tax deadlines for most things, so it should come as no surprise that there are deadlines for amended tax returns.
To claim a refund, you generally need to file the amended return by the later of:
- Three years from the date you filed the original return, or
- Two years from the date you paid the tax.
Here's the detail that trips people up: if you filed the original return early, the IRS treats it as filed on the April due date, and your three years run from there. So a 2025 return filed in February 2026 has a three-year clock that starts April 15, 2026.
If you miss the refund deadline, you lose the chance to collect any additional refund for that year. If instead you owe more than you paid, pay it as soon as you can even if the deadline has passed, since interest and penalties keep adding up. A handful of situations, such as bad debts, worthless securities, and certain carrybacks, come with longer windows, so check with a tax professional if one of those applies to you.
The IRS generally has three years to assess additional tax, although longer periods can apply in certain situations.
## What Happens After You Amend Your Tax Return?
After you file, expect a wait while the IRS processes the amendment. Most take about 8 to 12 weeks, though some run up to 16. Amended returns generally take longer to process than original returns.
It is reasonable to expect an electronic filing to take less time to process than a filing by mail. The reason is that e-filings are received immediately, while mailed filings take additional time to travel and process.
If the IRS requires any additional documentation for your amendment, they will contact you to request it. That means if you make an error filling out a tax form or schedule, or if you neglect to include a form, they will let you know. Be aware that any mistakes like these will likely add to your waiting time for a refund or resolution.
**CPA Insight:**
If your amendment increases the tax you owe, file and pay as soon as you find the error rather than waiting. Interest runs from the original due date of the return, not from the date you amend, so the sooner you pay, the less it costs you.
## Frequently Asked Questions
Here are answers to the questions we hear most often about Form 1040-X, amended returns, and refund deadlines.
### How do I check the status of my amended return?
Use the IRS[Where's My Amended Return?](https://www.irs.gov/filing/wheres-my-amended-return) tool, which you can start checking about three weeks after you file. It tracks your Form 1040-X through three stages: received, adjusted, and completed. "Adjusted" means the IRS made a change to your account, and "completed" means it's done and any related notice is on its way to you by mail.
### How far back can I amend a tax return?
For a refund, the practical limit is the deadline above: three years from when you filed the original return, or two years from when you paid the tax, whichever is later. You can technically file an amendment for an older year if you owe more tax, but once the refund window has closed, you won't get money back for that year.
### Can I amend a tax return more than once?
Yes. You can correct the same year again if you find another error. The IRS allows up to three electronically filed amended returns per tax year, and once a third one is accepted, any further attempts for that year are rejected.
### How long does an amended return take to process?
Plan on about 8 to 12 weeks, and sometimes up to 16. E-filing can trim a week or two off the front end because it skips the mail, but the IRS still processes amended returns largely by hand, so they take longer than an original return.
### Can I file an amended return for free?
The IRS doesn't charge a fee to file Form 1040-X. Whether you pay anything depends on how you file it, since some tax software includes amended returns and some charge for them. You can also fill out and mail the paper form yourself at no cost.
### Does filing an amended return trigger an audit?
Amending doesn't automatically flag you for an audit. The IRS reviews amended returns, and a large or unusual change can draw a closer look, but correcting an honest mistake is a normal part of the process. Accurate figures and good documentation are your best protection either way.
## Let Our Tax Advisors Assist You with Your Tax Returns
A mistake on your federal return can be stressful, but amending it to fix the error usually isn't. What we've covered here should help you amend your return and collect any additional refund you're owed.
Need help filing your income taxes or amending a federal return? Our tax advisors are here for it. Read about our[income tax services](https://cmp.cpa/services/income-tax-services/) and book a free consultation today.
[](https://blog.cmp.cpa/hs/cta/wi/redirect?encryptedPayload=AVxigLJRLvV9T4HqO%2BzrVKl%2BMgac5EngAgvvemFFjBZgcrivWMf1WJCt7qNP4LPV2rOp4uFxobylsQOHHWIMnKR7HIlJXFQoILzjNtjPharqry6ANOm1MHOwEEuHu5blKDdSb6YcRMaknEZoWC4qvCuj9yrEbjUJz75EYGFbq6ylnKK4lyKaWHKu3zkGL1dlVaHivjabDw%3D%3D&webInteractiveContentId=208861202306&portalId=1853761)
*This content is for educational purposes only and may not apply to your specific tax situation. Tax laws are complex, subject to change, and depend on individual circumstances. Consult a qualified tax advisor before relying on this information.*
[](https://cmp.cpa/team/zach-kimball/)
About Zach Kimball
Zach Kimball is a Tax Associate in the Logan Office. He is currently completing his master’s degree in accounting at Southern Utah University and will graduate in the Fall of 2025. A Cache Valley native, Zach is eager to help individuals and business owners with their tax-related issues. He currently helps with bookkeeping, payroll, and tax return preparation. Outside of work, Zach likes to mountain bike, ski, and golf.
[Read Full Bio](https://cmp.cpa/team/zach-kimball/)
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```
```json
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"description" : "Filing your federal income tax return can be stressful even when your taxes are straightforward. But what happens when you find something you need to change on a return you already filed? The short answer: you file an amended tax return with the IRS.",
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```json
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"text" : "An amended tax return lets you make one or more changes to a tax return you already filed with the IRS. You file it on Form 1040-X to correct things like your filing status, income, deductions, or credits."
},
"name" : "What is an amended tax return?"
}, {
"@type" : "Question",
"acceptedAnswer" : {
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"text" : "You don't refile. Once the IRS has accepted your original return, you can't submit a fresh one over the top of it. If you catch the error before the filing deadline, you file a superseding return, which replaces your original return entirely. If you catch it after the deadline, you file Form 1040-X, an amended return that reports what changed rather than replacing the return."
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"name" : "Amending vs. refiling: what's the difference?"
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"text" : "Yes. To claim a refund, you generally need to file the amended return by the later of three years from the date you filed the original return or two years from the date you paid the tax. If you filed the original return early, the IRS treats it as filed on the April due date, and your three years run from there. If you miss the refund deadline, you lose the chance to collect any additional refund for that year."
},
"name" : "Is there a deadline to file an amended tax return?"
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"acceptedAnswer" : {
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"text" : "Expect a wait while the IRS processes the amendment. Most take about 8 to 12 weeks, though some run up to 16. If the IRS requires any additional documentation for your amendment, they will contact you to request it, and mistakes like a missing form will likely add to your waiting time."
},
"name" : "What happens after you amend your tax return?"
}, {
"@type" : "Question",
"acceptedAnswer" : {
"@type" : "Answer",
"text" : "Use the IRS Where's My Amended Return? tool, which you can start checking about three weeks after you file. It tracks your Form 1040-X through three stages: received, adjusted, and completed. Adjusted means the IRS made a change to your account, and completed means it is done and any related notice is on its way to you by mail."
},
"name" : "How do I check the status of my amended return?"
}, {
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"acceptedAnswer" : {
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"text" : "For a refund, the practical limit is three years from when you filed the original return, or two years from when you paid the tax, whichever is later. You can technically file an amendment for an older year if you owe more tax, but once the refund window has closed, you won't get money back for that year."
},
"name" : "How far back can I amend a tax return?"
}, {
"@type" : "Question",
"acceptedAnswer" : {
"@type" : "Answer",
"text" : "Yes. You can correct the same year again if you find another error. The IRS allows up to three electronically filed amended returns per tax year, and once a third one is accepted, any further attempts for that year are rejected."
},
"name" : "Can I amend a tax return more than once?"
}, {
"@type" : "Question",
"acceptedAnswer" : {
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"text" : "Plan on about 8 to 12 weeks, and sometimes up to 16. E-filing can trim a week or two off the front end because it skips the mail, but the IRS still processes amended returns largely by hand, so they take longer than an original return."
},
"name" : "How long does an amended return take to process?"
}, {
"@type" : "Question",
"acceptedAnswer" : {
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"text" : "The IRS doesn't charge a fee to file Form 1040-X. Whether you pay anything depends on how you file it, since some tax software includes amended returns and some charge for them. You can also fill out and mail the paper form yourself at no cost."
},
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}, {
"@type" : "Question",
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"text" : "Amending doesn't automatically flag you for an audit. The IRS reviews amended returns, and a large or unusual change can draw a closer look, but correcting an honest mistake is a normal part of the process. Accurate figures and good documentation are your best protection either way."
},
"name" : "Does filing an amended return trigger an audit?"
} ]
}
```