IRS Form 6251 is a document used to calculate the Alternative Minimum Tax (AMT) for individual taxpayers.
With our fillable Form 6251, you can skip the confusing IRS instructions; just enter your figures and download it as a PDF in no time.
Form 6251
2025
Trusted by accountants
Official IRS form
Filed annually
How to Fill Out Form 6251
- Open the editable Form 6251
- Enter income adjustments from Form 1040
- Add back preference items like ISOs and SALT
- Calculate your tentative minimum tax
- Compare it to your regular tax
- Download and attach to your return
What Is Form 6251 Used For?
Form 6251 is used to calculate whether an individual owes the Alternative Minimum Tax (AMT), a separate tax system that limits certain deductions, exclusions, and other tax benefits. It accounts for specific AMT adjustments and preference items, such as income from exercising certain incentive stock options, that may receive different treatment under the regular tax system.
Who Should Use Form 6251?
Taxpayers should file Form 6251 when their income and AMT adjustments or preference items cause their tentative minimum tax to exceed their regular tax, or when certain tax credits require the calculation. Common factors that can affect AMT include exercising incentive stock options and claiming deductions for state and local taxes.
When Is Form 6251 Due?
The Form 6251 due date is the same as that for the individual income tax return and is generally due by April 15. If you receive an automatic filing extension, the return and Form 6251 can generally be filed by October 15, although any tax owed is still due by the original April deadline.
What Happens If Form 6251 Is Not Submitted?
If Form 6251 is not submitted, the IRS may recalculate your liability, bill you for the unpaid alternative minimum tax, and add penalties plus interest for late payment. Correcting the omission generally means filing an amended return with the missing form attached.
How and Where Do I File Form 6251?
You file Form 6251 as an attachment to your individual income tax return, and it can generally be submitted electronically or with a paper return. If filing by mail, you should send it with your return to the IRS address listed in the instructions for that underlying return.
How to Get Your Form 6251
1Open the printable Form 6251
2Enter your AMT adjustments and preferences
3Download Form 6251 to your device
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Frequently asked questions
#1. How do I get a blank Form 6251?
You can get a blank Form 6251 directly from pdf.net. Once you access it in our editor, you can enter your figures, and once finished, save the form to your device.
#2. Can I submit the Form 6251 electronically?
Yes, you can submit Form 6251 electronically as part of your e-filed Form 1040 through most tax software. Mailing a paper return instead just means attaching the completed Form 6251 behind your 1040.
#3. What if my Form 6251 is missing information?
If your Form 6251 is missing information, the IRS may contact you for additional information or request a missing form or schedule. If the error changes your income, deductions, credits, or tax liability, you may need to file Form 1040-X with a corrected Form 6251, Alternative Minimum Tax.
#4. Can I fill out my Form 6251 online?
Yes, you can fill out Form 6251 online using pdf.net's editor, with no printing or scanning required. Enter your adjustments while referring to Form 6251 instructions, save your progress, and download the finished form when you're done.
#5. Is this form free?
Opening and completing Form 6251 in our editor is free; however, downloading the completed form requires a paid plan.
#6. Can I correct mistakes on Form 6251?
Yes, you can correct mistakes on Form 6251. If an error on Form 6251 affects your tax liability after you have already filed your return, you can generally fix it by filing Form 1040-X and including a revised Form 6251. Simple math errors may be corrected by the IRS automatically and may not require an amended return.
#7. Do I need to file Form 6251 if I don't owe AMT?
No, you don’t necessarily need to file Form 6251 if you don’t owe AMT. You generally only need to do so if you meet one of the IRS filing conditions, which can include certain AMT calculations or tax credits, even if the final amount of AMT you owe is zero.
#8. How do I calculate my alternative minimum tax?
To calculate AMT, use Form 6251 to adjust your taxable income for items treated differently under the AMT rules, then subtract the applicable AMT exemption and apply the AMT tax rates. The result is used to determine whether your tentative minimum tax exceeds your regular tax and whether you owe additional AMT. Reviewing a Form 6251 example with sample entries can make the math easier before you enter your own numbers.