Alternative Minimum Tax (AMT)

Accelerated Depreciation and AMT: Common AMT Trigger

4:44Premium Video

Written byLipai WangFounder · IRS-registered tax professional

Key Takeaways

Regular tax uses faster MACRS depreciation; AMT uses slower methods
The difference creates a timing adjustment that can trigger AMT
Most impactful for businesses with large depreciable asset purchases
This is a timing difference — total depreciation is the same over the asset's life
AMT paid due to depreciation timing may be recoverable through future AMT credits

Accelerated Depreciation and AMT

The U.S. tax system uses MACRS (Modified Accelerated Cost Recovery System) for depreciation, which allows businesses to recover the cost of assets faster in earlier years. Under the regular tax system, you might use 200% declining balance depreciation. Under the AMT system, depreciation is generally calculated using 150% declining balance or straight-line methods.

This difference in depreciation speed creates a temporary timing difference between regular tax and AMT, potentially triggering AMT in the years when accelerated depreciation is highest.

Why This Matters for Business Owners

If your business has significant depreciable assets — equipment, vehicles, machinery — the accelerated depreciation deductions that reduce your regular tax may simultaneously increase your AMT exposure. This is particularly relevant for capital-intensive industries like manufacturing, technology infrastructure, and real estate.

The good news is that this is a timing difference, not a permanent one. Over the life of the asset, total depreciation is the same under both systems. The AMT paid in early years may generate credits that can be recovered in later years.

Frequently Asked Questions

Does Section 179 also trigger AMT?

Section 179 expensing is generally allowed for both regular tax and AMT purposes, so it typically does not create an AMT adjustment. However, the interaction between Section 179, bonus depreciation, and overall AMT calculations can be complex.

Is post-2017 property affected?

The TCJA changed depreciation rules (including 100% bonus depreciation), which has altered the AMT impact of depreciation for property placed in service after 2017. As bonus depreciation phases down, the AMT impact of depreciation timing differences may increase again.

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