Form AMTT, Alternative Minimum Tax (Calculation of Tax) (2025), is the Minnesota Department of Revenue form for figuring the Minnesota alternative minimum tax (AMT), the AMT credit and the credit carried to 2026. It asks for a corporation name and Minnesota Tax ID, and unitary businesses complete a FEIN column for each member with nexus in Minnesota. On this page you can fill out the form online on FillingPDF and download or print the completed PDF; the original PDF is published by the Minnesota Department of Revenue.
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What is AMTT?
Form AMTT, Alternative Minimum Tax (Calculation of Tax) (2025), is the Minnesota Department of Revenue form that works out a corporation's Minnesota alternative minimum tax (AMT), the AMT credit, and the AMT credit carried to 2026.
The form has three blocks. The AMT computation (lines 1 to 10) starts from alternative minimum taxable income on Schedule AMTI, line 9, applies the apportionment factor from M4A, line 9, adds Minnesota nonapportionable income from M4T, line 4a, subtracts the AMT net-operating-loss deduction and the deduction for dividends received, and compares the resulting tentative minimum tax with the regular tax from M4T, line 10. The AMT credit block (lines 11 to 13) starts from the carryover on the 2024 AMTT, line 15. The AMT carryover calculation (lines 14 and 15) produces the credit carried to 2026.
The results do not stay on this form: the form tells you to enter the line 10 amount on M4T, line 11, and the line 13 amount on M4T, line 13. Amounts are rounded to the nearest whole dollar. The printed heading reads "Single/designated filer".
Who needs to file AMTT?
The form's header asks for a Corporation Name and a Minnesota Tax ID, which places Form AMTT with corporations that calculate Minnesota alternative minimum tax as part of their Minnesota return, together with the M4T, M4A and Schedule AMTI figures it draws on.
- Unitary businesses: the form tells you to complete a FEIN column for each member with nexus in Minnesota.
- Filers with an AMT credit carryover from 2024: line 11 picks up the amount from line 15 of the 2024 AMTT.
- Filers with an alternative tax net operating loss: line 6a takes the deduction, and a schedule showing its computation must be attached.
If the result of line 5 is zero or less, the form tells you to skip lines 6a, 6b and 6 and leave line 7 blank. The form does not describe who may sign or file on a corporation's behalf.
When to file AMTT
Form AMTT has no due date of its own printed on it. You complete it when you prepare the Minnesota return that uses form M4T, because the form directs you to enter the line 10 amount on M4T, line 11, and the line 13 amount on M4T, line 13.
Two timing rules are printed on the form. Line 11 uses the AMT credit carryover from the 2024 AMTT, line 15, so you need last year's form first. And line 15 shows the AMT credit carried to 2026, which becomes next year's starting point. For the alternative tax net operating loss on line 6a, the form says losses may be carried forward only, and the carryforward period is 15 years.
Documents you need
- A schedule showing the computation of your alternative tax net-operating-loss deduction, attached only if you claim a deduction on line 6a.
- Schedule AMTI, line 9, which supplies the alternative minimum taxable income entered on line 1; the net operating loss must include all its adjustments and preference items, including the adjusted current earnings statement.
- Form M4A, line 9 (apportionment factor), and form M4T, lines 4a, 8 and 10, which supply the amounts for lines 2, 4, 6b and 9.
- The 2024 AMTT, line 15, if you had an AMT credit carryover, since line 11 takes the carryover from that line.
How to fill out AMTT
Enter corporation name and IDs
Fill in the Corporation Name and Minnesota Tax ID at the top. If you are a unitary business, complete a FEIN column for each member with nexus in Minnesota.
Round amounts to whole dollars
The form says you must round amounts to the nearest whole dollar, so enter whole numbers on every line.
Enter AMTI and apportionment factor
Line 1: alternative minimum taxable income from AMTI, line 9. Line 2: the apportionment factor from M4A, line 9. Line 3: multiply line 1 by line 2.
Add nonapportionable income
Line 4: Minnesota nonapportionable income from M4T, line 4a. Line 5: add lines 3 and 4; if the result is zero or less, skip lines 6a, 6b and 6 and leave line 7 blank.
Enter the AMT net operating loss
Line 6a: the AMT net-operating-loss deduction, which may not exceed 90 percent of line 5. Attach a schedule showing the computation; the loss is carried forward only, for 15 years.
Enter dividends received deduction
Line 6b: the deduction for dividends received from M4T, line 8, not exceeding 90 percent of line 5. Line 6: add lines 6a and 6b, again not exceeding 90 percent of line 5.
Figure Minnesota AMT income
Line 7: subtract line 6 from line 5. Line 8: tentative minimum tax, found by multiplying line 7 by the rate printed on that line.
Compare with regular tax
Line 9: regular tax from M4T, line 10. Line 10: subtract line 9 from line 8, leaving the line blank if the result is zero or less, then enter the amount on M4T, line 11.
Complete the AMT credit lines
Line 11: AMT credit carryover from the 2024 AMTT, line 15. Line 12: subtract line 8 from line 9 (blank if zero or less). Line 13: the lesser of line 11 or line 12, entered also on M4T, line 13.
Calculate the credit carried to 2026
Line 14: add lines 10 and 11. Line 15: subtract line 13 from line 14; this is the AMT credit carried to 2026.
Review and download the completed PDF
Check the rounding, the 90 percent limits and the amounts carried to M4T, then download or print the completed PDF from FillingPDF and attach the line 6a schedule if you claimed that deduction.
How to submit AMTT
Form AMTT prints no mailing address, portal or appointment rule of its own. Its results are entered on M4T, line 11 and line 13, so follow the Minnesota Department of Revenue's submission instructions for the return that includes M4T.
- Complete the form: round every amount to the nearest whole dollar and enter the corporation name and Minnesota Tax ID.
- Attach the line 6a schedule: if you claim an alternative tax net-operating-loss deduction, attach a schedule showing how you computed it.
- Carry the results: enter the line 10 amount on M4T, line 11, and the line 13 amount on M4T, line 13.
FillingPDF lets you fill out and download the PDF; submission follows the channels of the Minnesota Department of Revenue.
Common mistakes to avoid
- Entering cents instead of rounding every amount to the nearest whole dollar, as the form requires.
- Completing lines 6a, 6b, 6 and 7 when line 5 is zero or less; the form says to skip 6a, 6b and 6 and leave line 7 blank.
- Letting line 6a, line 6b or the line 6 total exceed 90 percent of line 5.
- Claiming a line 6a deduction without attaching the schedule that shows the alternative tax net-operating-loss computation.
- Using a net operating loss that omits the adjustments and preference items on Schedule AMTI, or treating it as carried back; it may be carried forward only, for 15 years.
- Entering a negative amount on line 10 or line 12 instead of leaving the line blank when the result is zero or less.
- Entering on line 13 an amount other than the lesser of line 11 or line 12.
- Taking line 11 from the wrong year; it is the carryover from line 15 of the 2024 AMTT.
- Forgetting to enter the line 10 and line 13 amounts on M4T, lines 11 and 13.
- Leaving out a FEIN column for a unitary business member that has nexus in Minnesota.
Frequently asked questions
What is Form AMTT for the Minnesota alternative minimum tax?
Form AMTT, Alternative Minimum Tax (Calculation of Tax) (2025), is the Minnesota Department of Revenue form that calculates a corporation's Minnesota alternative minimum tax, the AMT credit and the AMT credit carried to 2026. Its results are entered on M4T.
Where do the AMTT amounts go on the Minnesota return?
Enter the line 10 amount (AMT) on M4T, line 11, and the line 13 amount (AMT credit) on M4T, line 13. The form prints both instructions directly under those lines.
What is the limit on the net operating loss deduction on line 6a?
Line 6a may not exceed 90 percent of line 5. The loss must include all adjustments and preference items listed on Schedule AMTI, can be carried forward only for 15 years, and you must attach a schedule showing the computation.
What do I enter on line 11 of Form AMTT?
Enter the AMT credit carryover from 2024, taken from line 15 of the 2024 AMTT. Line 13 then uses the lesser of line 11 or line 12 as the AMT credit for the year.
What if line 5 is zero or less?
Skip lines 6a, 6b and 6 and leave line 7 blank. The form prints this instruction on line 5; do not enter a deduction in those lines.
How do unitary businesses complete Form AMTT?
Unitary businesses complete a FEIN column for each member with nexus in Minnesota, as noted beside the Corporation Name box at the top of the form. The Minnesota Tax ID is also requested there.
Can I fill out Form AMTT online?
Yes. You can fill out the PDF online on FillingPDF and download or print it. FillingPDF is an independent service and does not file the form with the Minnesota Department of Revenue; submission follows the department's channels.
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