AMTT: Alternative Minimum Tax (Calculation of Tax) (2025)
Minnesota · Minnesota DOR · Used for tax years 2025
Minnesota Form AMTT calculates a corporation’s alternative minimum tax for 2025 by comparing tentative minimum tax with regular tax. It also calculates the AMT credit and the credit carryover to 2026.
Who files this form
The form includes a column for a single or designated corporate filer. Unitary businesses must complete a separate column for each member with nexus in Minnesota.
The supplied text does not state broader requirements for who must file Form AMTT.
What you'll need
Have these forms and details available to complete the 2025 AMTT:
- Corporation name, FEIN, and Minnesota Tax ID.
- Schedule AMTI, line 9, for alternative minimum taxable income.
- M4A, line 9, for the apportionment factor.
- M4T, lines 4a, 8, and 10, for Minnesota nonapportionable income, the dividends-received deduction, and regular tax.
- Your 2024 AMTT, line 15, for any AMT credit carryover.
If you claim an alternative tax net-operating-loss deduction on line 6a, attach a schedule showing its computation. The loss must include all adjustments and preference items listed on Schedule AMTI, including the adjusted current earnings statement.
Common mistakes
- Not rounding amounts to the nearest whole dollar, as required.
- Completing lines 6a, 6b, and 6 when line 5 is zero or less. In that case, skip those lines and leave line 7 blank.
- Exceeding the deduction limits. Line 6a, line 6b, and their combined total on line 6 must each be no more than 90 percent of line 5.
- Forgetting to attach the computation schedule for the alternative tax net-operating-loss deduction.
- Entering an amount on line 10 or line 12 when the result is zero or less. Leave the applicable line blank.
- Forgetting to transfer line 10 amounts to M4T, line 11, and line 13 amounts to M4T, line 13.
Questions people ask
How is tentative minimum tax calculated?
Multiply Minnesota alternative minimum taxable income on line 7 by 0.058 and enter the result on line 8.
How do I calculate AMT?
Subtract regular tax on line 9 from tentative minimum tax on line 8. Enter the result on line 10. If the result is zero or less, leave line 10 blank.
Can an alternative tax net operating loss be carried back?
No. The form says net operating losses may be carried forward only. The carryforward period is 15 years.
How is the AMT credit calculated?
Enter the AMT credit carryover from your 2024 AMTT, line 15, on line 11. On line 12, subtract line 8 from line 9, leaving it blank if the result is zero or less. Line 13 is the smaller of line 11 or line 12.
How do I calculate the credit carried to 2026?
Add lines 10 and 11 to get line 14. Then subtract line 13 from line 14 and enter the result on line 15 as the AMT credit carried to 2026.