Turbotax ask me on schedule E worksheet asset entry worksheet to enter "AMT Special Depreciation Allowance deduction." I am not sure what that is and how to respond?

[PatriciaV]

If you have claimed depreciation on this asset before, you should have an Alternative Minimum Tax Depreciation Report in your prior year return. This report includes a column for AMT Special Depreciation Allowance. Enter the amount from this report for the requested entry.

If you haven't claimed depreciation in the past for this asset, enter zero. Or if you know you didn't claim Special "Bonus" Depreciation the first year you used this asset, enter zero.

If you need to find this report from last year, see How do I view, download, or print a prior-year tax return?