Did you discover that you made a mistake after you filed your federal tax return? You can make it right by filing an amended tax return. Here are the top ten things to know about filing an amended tax return.

1. Use Form 1040X, Amended U.S. Individual Income Tax Return, to correct errors on your tax return. You must file an amended return on paper. It can’t be e-filed.
2. You usually should file an amended tax return if you made an error claiming your filing status, income, deductions or credits on your original return.
3. You normally don’t need to file an amended return to correct math errors. The IRS will automatically make those changes for you. Also, do not file an amended return because you forgot to attach tax forms, such as a W-2 or schedule. The IRS will usually send you a request for those.
4. You usually have three years from the date you filed your original tax return to file Form 1040X to claim a refund. You can file it within two years from the date you paid the tax, if that date is later. That means the last day for most people to file a 2010 claim for a refund is April 15, 2014. See the 1040X instructions for special rules that apply to certain claims.
5. If you are amending more than one tax return, prepare a 1040X for each year. You should mail each year in separate envelopes. Note the tax year of the return you are amending at the top of Form 1040X. Check the form’s instructions for where to mail your return.
6. If you use other IRS forms or schedules to make changes, make sure to attach them to your Form 1040X.
7. If you are due a refund from your original return, wait to receive that refund before filing Form 1040X to claim an additional refund. Amended returns take up to 12 weeks to process. You may spend your original refund while you wait for any additional refund.
8. If you owe more tax, file your Form 1040X and pay the tax as soon as possible. This will reduce any interest and penalties.
9. You can track the status of your amended tax return three weeks after you file with ‘Where’s My Amended Return?’ This tool is available on IRS.gov or by phone at 866-464-2050. It’s available in English and in Spanish. The tool can track the status of an amended return for the current year and up to three years back.
10. To use ‘Where’s My Amended Return?’ enter your taxpayer identification number, which is usually your Social Security number. You will also need your date of birth and zip code. If you have filed amended returns for multiple years, select each year one by one.

Additional IRS Resources:

• Tax Topic 308 – Amended Returns
• FAQs about Amended Returns & Form 1040X
• 1040 Central

WASHINGTON — The Internal Revenue Service today reminded taxpayers to review their tax returns for common errors that could delay the processing of their returns. Here are some ways to avoid common mistakes.

File electronically. Filing electronically, whether through e-file or IRS Free File, vastly reduces tax return errors, as the tax software does the calculations, flags common errors and prompts taxpayers for missing information. And best of all, there is a free option for everyone.

Mail a paper return to the right address. Paper filers should check IRS.gov or their form instructions for the appropriate address where to file to avoid processing delays.

Take a close look at the tax tables. When figuring tax using the tax tables, taxpayers should be sure to use the correct column for the filing status claimed.

Fill in all requested information clearly. When entering information on the tax return, including Social Security numbers, take the time to be sure it is correct and easy to read. Also, check only one filing status and the appropriate exemption boxes.

Review all figures. While software catches and prevents many errors on e-file returns, math errors remain common on paper returns.

Get the right routing and account numbers. Requesting direct deposit of a federal refund into one, two or even three accounts is convenient and allows the taxpayer access to his or her money faster. Make sure the financial institution routing and account numbers entered on the return are accurate. Incorrect numbers can cause a refund to be delayed or deposited into the wrong account.

Sign and date the return. If filing a joint return, both spouses must sign and date the return. E-filers can sign using a self-selected personal identification number (PIN).

Attach all required forms. Paper filers need to attach W-2s and other forms that reflect tax withholding, to the front of their returns. If requesting a payment agreement with the IRS, also attach Form 9465 to the front of the return. Attach all other necessary schedules and forms in the sequence number order shown in the upper right-hand corner.

Keep a copy of the return. Once ready to be filed, taxpayers should make a copy of their signed return and all schedules for their records.

Request a Filing Extension. For taxpayers who cannot meet the April 15 deadline, requesting a filing extension is easy and will prevent late filing penalties. Either use Free File or Form 4868. But keep in mind that while an extension grants additional time to file, tax payments are still due April 15.

Owe tax? If so, a number of e-payment options are available. Or send a check or money order payable to the “United States Treasury.”

Taxpayers may find additional help and resources on IRS.gov, including 1040 Central and the IRS Services Guide.