Don't worry if you made a mistake on your tax return or forgot to claim a tax credit or deduction. You can fix it by filing an amended return. Here are 10 tips that you should know about amending your federal tax return:

  1. When to amend. You should amend your tax return if you need to correct your filing status, the number of dependents you claimed, or your total income. You should also amend your return to claim tax deductions or tax credits that you did not claim when you filed your original return. The instructions for Form 1040X, Amended U.S. Individual Income Tax Return, list more reasons to amend a return.
  2. When NOT to amend. In some cases, you don't need to amend your tax return. The IRS usually corrects math errors when processing your original return. If you didn't include a required form or schedule, the IRS will send you a request for the missing item.
  3. Form to use. Use Form 1040X to amend a federal income tax return that you previously filed. Make sure you check the box at the top of the form that shows which year you are amending. Since you can't e-file an amended return, you'll need to file your Form 1040X on paper and mail it to the IRS.
  4. More than one year. If you file an amended return for more than one year, use a separate 1040X for each tax year. Mail them in separate envelopes to the IRS. See "Where to File" in the instructions for Form 1040X for the correct address to use.
  5. Form 1040X. Form 1040X has three columns. Column A shows amounts from the original return. Column B shows the net increase or decrease for the amounts you are changing. Column C shows the corrected amounts. You should explain what you are changing and the reasons why on the back of the form.
  6. Other forms or schedules. If your changes involve other tax forms or schedules, make sure you attach them to Form 1040X when you file the form. Failure to do this will cause a delay in processing.
  7. Amending to claim an additional refund. If you are waiting for a refund from your original tax return, don't file your amended return until after you receive the refund. You may cash the refund check from your original return. Amended returns take up to 12 weeks to process. You will receive any additional refund you are owed.
  8. Amending to pay additional tax. If you're filing an amended tax return because you owe more tax, you should file Form 1040X and pay the tax as soon as possible. This will limit any interest and penalty charges.
  9. When to file. To claim a refund, you generally must file Form 1040X within three years from the date you filed your original tax return. You can also file it within two years from the date you paid the tax, if that date is later than the three-year rule.
  10. Track your return. 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.

TaxAct Deluxe includes Form 1040X. View instructions for amending your federal return and instructions for amending your state return.

Additional IRS References

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Upcoming Tax Dates

January 1 — Everyone
Federal Holiday (New Year's Day) Details

January 10 — Employees who work for tips
If you received $20 or more in tips during December, report them to your employer Details

January 15 — Individuals
Make a payment of your estimated tax for 2018 if you did not pay your income tax for the year through withholding (or did not pay in enough tax that way). Use Form 1040-ES Details

January 15 — Social security, Medicare, and withheld income tax
If the monthly deposit rule applies, deposit the tax for payments in December 2018

January 15 — Farmers & fishermen
Pay your estimated tax for 2018 using Form 1040-ES Details

January 21 — Everyone
Federal Holiday (Martin Luther King, Jr. Day) Details

January 31 — All Employers
Give your employees their copies of Form W2 for 2018. If an employee agreed to receive Form W2 electronically, have it posted on a website and notify the employee of the posting.

January 31 — Individuals who must make estimated tax payments
If you did not pay your last installment of estimated tax by January 15, you may choose (but are not required) to file your income tax return (Form 1040) for 2017 by January 31. Filing your return and paying any tax due by January 31 prevents any penalty for late payment of the last installment. If you cannot file and pay your tax by January 31, file and pay your tax by April 15.

January 31 — Payers of gambling winnings
If you either paid reportable gambling winnings or withheld income tax from gambling winnings, give the winners their copies of Form W2G.

January 31 — Social Security, Medicare, and withheld income tax
File Form 941 for the fourth quarter of 2018. Deposit or pay any undeposited tax under the accuracy of deposit rules. If your tax liability is less than $2,500, you can pay it in full with a timely filed return. If you deposited the tax for the quarter timely, properly, and in full, you have until 02-10 to file the return.

January 31 — Certain small employers
File Form 944 to report social security and Medicare taxes and withheld income tax for 2018. Deposit or pay any undeposited tax under the accuracy of deposit rules. If your tax liability is $2,500 or more for 2018 but less than $2,500 for the fourth quarter, deposit any undeposited tax or pay it in full with a timely filed return. If you deposited the tax for the year timely, properly, and in full, you have until February 10 to file the return.

January 31 — Farm employers
File Form 943 to report social security and Medicare taxes and withheld income tax for 2018. Deposit or pay any undeposited tax under the accuracy of deposit rules. If your tax liability is less than $2,500, you can pay it in full with a timely filed return. If you deposited the tax for the year timely, properly, and in full, you have until February 10 to file the return.

January 31 — Federal unemployment tax
File Form 940 for 2018. If your undeposited tax is $500 or less, you can either pay it with your return or deposit it. If it is more than $500, you must deposit it. However, if you deposited the tax for the year timely, properly, and in full, you have until February 10 to file the return.

January 31 — All businesses
Give annual information statements to recipients of certain payments you made during 2018 Details

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