Form 1040X


DEFINITION of 'Form 1040X'

A form used by taxpayers who have to amend their tax returns for any reason. Form 1040X is an itemized, line-by-line description of all necessary adjustments, so that the taxpayer can clearly record the exact type and amount of each amendment, and give a brief description of what is being amended and why.


Form 1040X can be downloaded off the Internal Revenue (IRS) website. In most cases, taxpayers who use this form need to also amend their state tax returns. Taxpayers must fill out this form regardless of whether they initially used Form 1040, Form 1040A or Form 1040EZ.

To learn more about this IRS tax form, read When would I need to fill out an IRS Form 1040X when filing my taxes?

  1. Amended Return

    A return filed in order to make corrections to a tax return from ...
  2. 1040EZ Form

    The 1040EZ is an alternative to the Internal Revenue Service's ...
  3. 1040 Form

  4. Duty Free

    Goods that international travelers can purchase without paying ...
  5. Tax Deductible Interest

  6. Deferred Tax Asset


  2. Does everyone have to file a federal tax return?

  3. What is the difference between comprehensive income and gross income?

  4. What tax breaks are afforded to a qualifying widow?

  5. How is income taxed on prorated salary?

  6. How can I tell which of my business expenses count as write-offs?

Related Articles
  1. Taxes

    Inaccurate Tax Return, Now What?

  2. Taxes

    Get A Tax Credit For Your Foreign Investments

  3. Taxes

    3 Common Tax Questions Answered

    We clarify some rules that often puzzle taxpayers.
  4. Taxes

    What's a Tax Shield?

  5. Taxes

    What's an Indirect Tax?

  6. Taxes

    Understanding Excise Taxes

  7. Taxes

    Understanding the W-2 Form

  8. Taxes

    IRS Refund Lost? Here's What to Do

  9. Economics

    What's a Deductible?

  10. Taxes

    Explaining Taxable Income

    Taxable income is the net of gross income and allowable deductions.

You May Also Like

Hot Definitions
  1. OsMA

  2. Investopedia

  3. Unfair Claims Practice

  4. Killer Bees

  5. Sin Tax

  6. Grandfathered Activities

Trading Center

You are using adblocking software

so you'll never miss a feature!