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

July 1 Occupational excise taxes
File Form 11C to register and pay the annual tax if you are in the business of accepting wagers.

July 4 Everyone
Federal Holiday (Independence Day) - Details

July 10 Employees who work for tips
If you received $20 or more in tips during June, report them to your employer - Details

July 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 June.

July 14 Regular method taxes
Deposit the tax for the last 15 days of June.

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

July 15 Nonpayroll withholding
If the monthly deposit rule applies, deposit the tax for payments in June.

July 27 Communications and air transportation taxes under the alternative method
Deposit the tax included in amounts billed or tickets sold during the last 15 days of June.

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

July 31 Social security, Medicare, and withheld income tax
File Form 941 for the second quarter of 2015. Deposit or pay any undeposited tax under the accuracy of deposit rules.

July 31 Certain small employers
Deposit any undeposited tax if your tax liability is $2,500 or more for 2015 but less than $2,500 for the second quarter.

July 31 Federal unemployment tax
Deposit the tax owed through June if more than $500.

July 31 All employers
If you maintain an employee benefit plan, such as a pension, profitsharing, or stock bonus plan, file Form 5500 or 5500EZ for calendar year 2014. If you use a fiscal year as your plan year, file the form by the last day of the seventh month after the plan year ends.

July 31 Form 720 taxes
File Form 720 for the second quarter of 2015.

July 31 Wagering tax
File Form 730 and pay the tax on wagers accepted during June.

July 31 Heavy highway vehicle use tax
File Form 2290 and pay the tax for vehicles first used in June.

View More Tax Dates