How do I know what AMT prior-year depreciation to enter here?
If you were subject to the Alternative Minimum Tax (AMT) in a prior year (usually because you had high income and a lot of itemized deductions), then your asset or vehicle would have needed to be depreciated differently, using a longer depreciation period. In this case, just enter the total depreciation taken for this asset or vehicle in the years you were subject to the AMT.
If you've never had to pay the AMT, then you can just enter zero here.
If you're not sure, look at your prior federal returns and see if there's a Form 6251 included with the return and an amount on the Alternative minimum tax line on your Form 1040, Schedule 2. If there is, then that year's depreciation for this asset or vehicle would go in this AMT prior-year depreciation box (the bottom one). If not, then you can just enter all prior-year depreciation for this asset or vehicle in the regular prior-year depreciation box (the top one).
If you've never had to pay the AMT, then you can just enter zero here.
If you're not sure, look at your prior federal returns and see if there's a Form 6251 included with the return and an amount on the Alternative minimum tax line on your Form 1040, Schedule 2. If there is, then that year's depreciation for this asset or vehicle would go in this AMT prior-year depreciation box (the bottom one). If not, then you can just enter all prior-year depreciation for this asset or vehicle in the regular prior-year depreciation box (the top one).
