The ACE depreciation will equal the AMT depreciation for all assets placed in service after December 31, 1993. The Adjusted Current Earnings (ACE) depreciation adjustment is computed as the difference between the Alternative Minimum Tax and ACE depreciation.
The difference occurs when tax return depreciation is different than book accounting depreciation. This creates the AMT adjustment.
Line 20 AH - Other Information
Box 20, Code AH are other items of information not found elsewhere on the Schedule K-1 (Form 1065) Partner's Share of Income, Deductions, Credits, etc. The taxpayer should receive instructions from the partnership needed to address the items contained in this box.
The firm who prepared the Partner's K-1 should include a description of the information and instructions on how to report the information on the Partner's individual return. If the firm didn't include a description or instructions, you must decide where you should report Other Information.
https://turbotax.intuit.com/tax-tips/irs-tax-return/alternative-minimum-tax-common-questions/L50YotK...
https://ttlc.intuit.com/turbotax-support/en-us/help-article/taxation/alternative-minimum-tax-amt-202...
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