AMT Credit Calculator — Form 8801 Multi-Year Tracking

The AMT credit (also called the "minimum tax credit", IRC §53) is a credit against future regular tax for the portion of prior-year Alternative Minimum Tax that resulted from timing differences — preferences that will reverse in future years. The classic example is the ISO bargain element: when you exercise ISOs and hold, the bargain is an AMT preference at exercise but eventually flows through as part of the capital-gain basis at sale. The §53 credit lets you recover the AMT paid in the exercise year against later years' regular tax, after the timing reversal.

Deferral preferences are timing differences — they create AMT now and reverse in a future year (creating a regular-tax deduction). The ISO bargain element is the most common deferral preference. Deferral AMT generates §53 credit. Exclusion preferences are permanent — they reduce regular taxable income but never reverse (e.g., SALT deduction, miscellaneous itemized deductions, private-activity bond interest). Exclusion AMT does NOT generate credit. The calculator isolates the deferral portion by recomputing AMT with the ISO bargain set to zero and treating the difference as the credit-generating amount.

In any future year where your regular tax exceeds your tentative minimum tax (TMT) — i.e., a year where you're NOT subject to AMT. The credit is limited to the gap between regular tax and TMT. For ISO holders this typically means: AMT in the year you exercised and held; credit recovered in the year you sell the shares (because the regular-tax cost basis includes the bargain, but the AMT-cost basis doesn't, so regular tax > TMT in the sale year). The credit carries forward indefinitely until used.

Generally no, post-TCJA. The §53(e) refundable AMT credit (which let unused old AMT credits be partially refundable) was repealed for tax years beginning after December 31, 2017. The credit can only offset regular tax above the AMT line. If you accumulate a large credit and never have enough regular tax to use it, the credit dies with you (it's not transferable, refundable, or deductible upon expiration). The exception: §53(e) was reinstated briefly under TCJA for corporations only — does not apply to individuals.

On your most recent Form 8801 (Credit for Prior Year Minimum Tax — Individuals, Estates, and Trusts), line 26 shows the credit carryover to the following year. If you used tax software (TurboTax, H&R Block, FreeTaxUSA, TaxAct), look at the Form 8801 generated for the most recent year you filed. If you've never had AMT, your balance is $0. The credit carries forward indefinitely; there's no expiration.

The standard ISO planning playbook: exercise-and-hold ISOs in a year with AMT headroom (limit the bargain element so AMT is owed but manageable), pay the AMT, generate the credit, then in a future year sell the ISO shares as a qualifying disposition to recover the credit. The sale year typically has regular tax > TMT because the AMT basis equals exercise FMV (already higher) while regular basis equals strike — the higher capital gain on regular tax pushes regular > TMT. Some sophisticated planners also harvest other ordinary income (Roth conversions, deferred comp distributions) in the sale year to maximize regular-tax-minus-TMT and accelerate credit usage.

The federal AMT credit (Form 8801) is purely federal — moving states doesn't change it. However, some states have their own state-level AMT (California most notably) with their own state-AMT credit. State AMT credits are separate from the federal one and follow each state's own rules. California's state AMT credit (Form 540 Schedule P) has been simplified post-2008 but still tracks separately. If you move from a state-AMT state to a no-state-AMT state, the federal credit is unaffected; the state credit follows that state's residency / sourcing rules.