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CAUTION

If the loss is from a passive activity, use line 13 instead. If the loss is from a tax shelter farm activity (that isn't passive), use line 21.

Refigure your allowable losses for AMT purposes from activities for which you aren't at risk and basis limitations applicable to interests in partnerships and stock in S corporations by taking into account your AMT adjustments and tax preference items. See sections 59(h), 465, 704(d), and 1366(d).

Enter the difference between the loss reported for regular tax purposes and the AMT loss. If the AMT loss is more than the loss reported for regular tax purposes, enter the adjustment as a negative amount.

Line 15—Circulation Costs

Expenditures for the development or exploration of a mine or certain other mineral deposits (other than an oil, gas, or geothermal well) deducted under sections 616(a) and 617(a) for regular tax purposes must be amortized for AMT purposes over 10 years beginning with the year the expenditures were paid or incurred.

Enter the difference between the amount allowed for AMT purposes and the amount allowed for regular tax purposes. If the amount allowed for AMT purposes exceeds the amount deducted for regular tax purposes, enter the difference as a negative amount.

If the estate or trust had a loss on property for which mining expenditures haven't been fully amortized for the AMT, the AMT deduction is the smaller of (a) the amount of the loss allowable for the expenditures had they remained capitalized, or (b) the remaining expenditures to be amortized for the AMT.

Line 18—Research and Experimental Costs

Don’t make this adjustment for costs paid or incurred