California · AMT Credit Carryforward
AMT Credit Carryforward in California (2026)
If you paid Alternative Minimum Tax in prior years due to timing differences (like ISO exercises), you can claim a credit against regular tax in future years. California has a progressive income tax with a top rate of 13.3%, so a California filer's combined marginal rate on the next dollar at $91,905 of income is about 31.3% (22% federal + 9.3% CA).
2026 savings example for California
Planning estimate for a single filer earning $91,905 (California median household income in LevyIO's state dataset) who claims a $5,000 credit. Federal tax uses the 2026 IRS brackets after the $16,100 standard deduction; CA tax uses the state brackets in LevyIO's dataset and assumes the state follows the federal treatment.
Estimated total savings
$5,000
Federal savings
$5,000
$11,389 → $6,389 · 22% bracket
CA state savings
$0
Federal credit only; check for a state credit
Combined marginal rate
31.3%
Credits do not depend on the bracket
Federal × California marginal rates (2026, single)
Gross-income ranges include the federal standard deduction. The CA column is the state marginal rate at the midpoint of each range. A credit saves its face value regardless of bracket.
| Federal bracket | Gross income (single) | CA marginal | Combined | Per $1,000 |
|---|---|---|---|---|
| 10% | $16,100 - $28,500 | 2% | 12% | $1,000 |
| 12% | $28,500 - $66,500 | 6% | 18% | $1,000 |
| 22% | $66,500 - $121,800 | 9.3% | 31.3% | $1,000 |
| 24% | $121,800 - $217,875 | 9.3% | 33.3% | $1,000 |
| 32% | $217,875 - $272,325 | 9.3% | 41.3% | $1,000 |
| 35% | $272,325 - $656,700 | 11.3% | 46.3% | $1,000 |
| 37% | Over $656,700 | 11.3% | 48.3% | $1,000 |
Eligibility & forms
Taxpayers with prior-year AMT payments from timing differences
- Must have paid AMT in prior years due to deferral items
- Credit for AMT paid on timing (not exclusion) items
- Can be carried forward indefinitely
Federal forms: Form 8801, Form 6251
California filing notes
Maximize tax-deferred contributions. Plan for the additional 1% surcharge over $1M. If leaving California, document your move thoroughly. The FTB aggressively audits departing high-income residents.
Common mistakes: Not tracking AMT credit from prior years; Confusing exclusion items with deferral items; Forgetting to file Form 8801 to claim the credit.
Frequently asked questions
How much can the AMT Credit Carryforward save a California taxpayer in 2026?
Credits reduce tax dollar-for-dollar. In LevyIO's example, a single filer with $91,905 of income (the California median household income in our state dataset) and a $5,000 credit would cut 2026 federal tax from $11,389 to $6,389, a $5,000 saving. Whether California offers a matching state credit depends on the CA return, so the estimate counts federal savings only.
What is the California income tax rate for 2026?
California has a progressive income tax with a top rate of 13.3%. The CA standard deduction in LevyIO's dataset is $5,706 single / $11,412 married. Highest state income tax (13.3%). Additional 1% Mental Health Services Tax over $1M. No preferential capital gains rate.
Who qualifies for the AMT Credit Carryforward in California?
Taxpayers with prior-year AMT payments from timing differences. The federal rules are the same in every state; the requirements are: Must have paid AMT in prior years due to deferral items; Credit for AMT paid on timing (not exclusion) items; Can be carried forward indefinitely. California filers should confirm on the CA return whether the state follows the federal treatment.
Which forms do I file to claim the AMT Credit Carryforward?
Federal: Form 8801, Form 6251. California: check the California Franchise Tax Board instructions for the matching state schedule. Common mistakes: Not tracking AMT credit from prior years; Confusing exclusion items with deferral items; Forgetting to file Form 8801 to claim the credit.
AMT Credit Carryforward in other states
Sources
Reviewed 2026-09-17. Estimates are educational planning figures computed from the IRS 2026 inflation adjustments and LevyIO's state bracket dataset; they are not tax advice.