If you discover an error on your federal income tax return after you e-filed or mailed it, you may want or need to amend your return. Perhaps you are eligible for a deduction or credit and you missed it the first time?

Here are eight key points the IRS wants you to know about when considering whether to file an amended federal income tax return.

  1. Use Form 1040X, Amended U.S. Individual Income Tax Return, to file an amended income tax return.
  2. Use Form 1040X to correct previously filed Forms 1040, 1040A or 1040EZ. An amended return cannot be e-filed; you must file it by paper.
  3. Generally, you do not need to file an amended return to correct math errors. The IRS will automatically make that correction. Also, do not file an amended return because you forgot to attach tax forms such as W-2s or schedules. The IRS normally will send a request asking for those.
  4. Be sure to enter the year of the return you are amending at the top of Form 1040X. Generally, you must file Form 1040X within three years from the date you filed your original return or within two years from the date you paid the tax, whichever is later.
  5. If you are amending more than one tax return, prepare a 1040X for each return and mail them in separate envelopes to the appropriate IRS campus. The 1040X instructions list the addresses for the campuses.
  6. If the changes involve another schedule or form, you must attach that schedule or form to the amended return.
  7. If you are filing to claim an additional refund, wait until you have received your original refund before filing Form 1040X. You may cash that check while waiting for any additional refund.
  8. If you owe additional 2011 tax, file Form 1040X and pay the tax before the due date to limit interest and penalty charges that could accrue on your account. Interest is charged on any tax not paid by the due date of the original return, without regard to extensions.

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

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Upcoming Tax Dates

April 10 Employees who work for tips
If you received $20 or more in tips during March, report them to your employer. You can use Form 4070.

April 10 Communications and air transportation taxes under the alternative method
Deposit the tax included in amounts billed or tickets sold during the first 15 days of March.

April 14 Regular method taxes
Deposit the tax for the last 16 days of March.

April 15 Individuals
File a 2014 income tax return (Form 1040, 1040A, or 1040EZ) and pay any tax due. If you want an automatic 6 month extension of time to file the return, file Form 4868, Application for Automatic Extension of Time To File U.S. Individual Income Tax Return. For more information, see Form 4868. Then, file Form 1040, 1040A, or 1040EZ by October 15.

April 15 Individuals
If you are not paying your 2015 income tax through withholding (or will not pay in enough tax during the year that way), pay the first installment of your 2015 estimated tax. Use Form 1040ES.

April 15 Household Employers
If you paid cash wages of $1,800 or more in 2014 to a household employee, you must file Schedule H - Details

April 15 Partnerships
File a 2014 calendar year return (Form 1065) - Details

April 15 Partnerships
Electing large partnerships: File a 2014 calendar year return (Form 1065-B) - Details

April 15 Corporations
Deposit the first installment of estimated income tax for 2015 - Details

April 15 Social security, Medicare, and withheld income tax
If the monthly deposit rule applies, deposit the tax for payments in March.

April 15 Nonpayroll withholding
If the monthly deposit rule applies, deposit the tax for payments in March.

April 15 Household employers
If you paid cash wages of $1,900 or more in 2014 to a household employee, you must file Schedule H (Form 1040). If you are required to file a federal income tax return (Form 1040), file Schedule H (Form 1040) with the return and report any household employment taxes. Report any federal unemployment (FUTA) tax on Schedule H (Form 1040) if you paid total cash wages of $1,000 or more in any calendar quarter of 2013 or 2014 to household employees. Also, report any income tax you withheld for your household employees.

April 27 Communications and air transportation taxes under the alternative method
Deposit the tax included in amounts billed or tickets sold during the last 16 days of March.

April 29 Regular method taxes
Deposit the tax for the first 15 days of April.

April 30 Social security, Medicare, and withheld income tax
File Form 941 for the first quarter of 2015. 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 May 11 to file the return.

April 30 Federal unemployment tax.
Deposit the tax owed through March if more than $500.

April 30 Form 720 taxes
File Form 720 for the first quarter of 2015.

April 30 Wagering tax
File Form 730 and pay the tax on wagers accepted during March.

April 30 Heavy highway vehicle use tax
File Form 2290 and pay the tax for vehicles first used in March.

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