AB 1219 replaces California’s resident and head‑of‑household personal income tax schedules for taxable years beginning on or after January 1, 2025 and before January 1, 2030 with a new, condensed set of brackets and marginal rates. The bill also pauses the standard inflation indexing for 2025 and instructs the Franchise Tax Board how to recompute brackets for 2030.
Beyond rates and thresholds, the bill clarifies how nonresidents and part‑year residents are taxed (using a proportional computation), limits inclusion of carryover items to California‑source amounts for nonresidents, treats estates and trusts like individuals for this part, and changes one state modification to the federal “kiddie tax.” These are temporary, statutory changes to the way California calculates taxable income and administers brackets for a defined period.
At a Glance
What It Does
For taxable years beginning in 2025 through 2029, AB 1219 installs a new set of resident and head‑of‑household tax brackets with different thresholds and marginal rates, suspends the annual inflation adjustment for 2025, and prescribes how to recompute brackets for 2030. It also changes rules for nonresident/part‑year computations, carryovers, and a state modification to the federal unearned‑income (kiddie) tax.
Who It Affects
California resident taxpayers and those filing as head of household; nonresidents and part‑year residents with California source income; tax preparers, payroll and tax software vendors, and the Franchise Tax Board, which must implement the temporary schedule and special recomputation rules.
Why It Matters
The bill alters taxable income thresholds and marginal rates for a five‑year window, reshaping who pays which marginal rate without changing the statutory top rate. That creates both operational work for administrators and vendors and distributional changes for millions of filers who will face a different schedule for those years.
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What This Bill Actually Does
AB 1219 is a temporary, statute‑level rewrite of the state’s rate tables and several related mechanics that together change how California computes individual income tax for a limited period. Rather than leaving adjustments solely to the Franchise Tax Board’s annual CPI indexing, the Legislature prescribes a new schedule that applies for tax years starting in 2025 through the end of 2029, then returns to the usual indexing regime with a special recomputation for 2030.
The bill keeps the existing framework—separate computations for residents, heads of household, nonresidents/part‑year residents, and estates/trusts—but replaces the numeric brackets that determine marginal rates and liabilities for the affected years. For taxpayers who are not full‑year residents, the statute requires the tax to be calculated proportionally: the tax owed is the product of the nonresident’s California taxable income and a rate equal to what the full resident tax would be on the taxpayer’s total income divided by that total income.On carryovers and losses, the statute tightens what nonresidents may claim: net operating losses and other carryover items are allowable only to the extent attributable to the resident portion of the year or to California‑source income during nonresident periods.
The Franchise Tax Board remains responsible for implementing the mechanics—accepting the Department of Industrial Relations’ CPI input, computing an inflation factor, rounding, and applying the temporary exceptions the bill creates.Finally, the bill treats estates and trusts as individuals for purposes of these brackets, explicitly notes the tax is not a surtax, and modifies a state tweak to the federal unearned‑income (kiddie) tax provision. Those changes are narrow but they affect how certain low‑income trusts, custodial accounts, and taxpayers with children’s unearned income will be taxed under state law during the covered years.
The Five Things You Need to Know
For taxable years starting Jan 1, 2025 and before Jan 1, 2030, the bill replaces the resident rate table with five brackets: 1% up to $25,499; 3% for income over $25,499 up to $40,245 (with $254.99 base); 5% from $40,245 to $55,866 (with $697.37 base); 7% from $55,866 to $70,606 (with $1,478.42 base); and 9.3% on income over $70,606 (with $2,510.22 base).
For heads of household for the same years the bill sets analogous, higher thresholds: 1% up to $51,000; 3% $51,000–$65,744 ($510 base); 5% $65,744–$81,364 ($952.32 base); 7% $81,364–$96,107 ($1,733.32 base); and 9.3% over $96,107 ($2,765.33 base).
Subdivision (h) pauses the Franchise Tax Board’s automatic CPI‑based inflation adjustment for taxable years beginning on or after Jan 1, 2025 and before Jan 1, 2026, and instructs a special recomputation for taxable years beginning Jan 1, 2030 (to use what brackets would have been absent the temporary schedule).
Subdivision (b) (and parallel (d)) requires nonresidents and part‑year residents to compute tax by multiplying their California taxable income by a rate equal to the tax that would be computed under the resident schedule on their total income divided by that total income (a proportional method).
Subdivision (g) modifies the state application of IRC §1(g): it applies the federal kiddie‑tax rules "except as otherwise provided" and specifically substitutes “1 percent” for the federal “10 percent” figure in Section 1(g)(7)(B)(ii)(II) for purposes of this part; estates and trusts are taxed under subdivision (e) like individuals.
Section-by-Section Breakdown
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Temporary resident rate schedule for 2025–2029
This clause supplies the explicit numeric tax table that replaces the standing resident brackets for taxable years beginning on or after January 1, 2025 and before January 1, 2030. It establishes five marginal rate bands with corresponding base amounts and breakpoints. Practically, this shifts many filers into a different marginal‑rate structure for that five‑year window; tax software and FTB forms must implement these exact numbers for those years.
Temporary head‑of‑household schedule for 2025–2029
Mirroring the resident schedule, this paragraph sets an adjusted set of thresholds and base amounts for filers who qualify as head of household for the same temporary period. The separate table preserves the statutory treatment of filing status while changing the numeric progression that determines where filers land in the rate structure.
Inflation indexing pause and 2030 recomputation rules
This section keeps the usual FTB indexing mechanics (the DIR‑provided California CPI and the FTB’s inflation adjustment factor and rounding rules) but carves out two exceptions: it prevents the standard adjustment from applying to taxable years beginning in 2025, and it requires that for 2030 the ‘‘preceding taxable year’’ brackets used in the CPI computation be what those brackets would have been if the temporary 2025–2029 schedule had never been enacted. That creates a defined restart point for the indexation mechanism.
Nonresident/part‑year income and carryover limits
This clause defines ‘‘taxable income of a nonresident or part‑year resident’’ and limits net operating losses and carryovers so they are only usable to the extent tied to the resident portion of the year or California‑source income during nonresident periods. It also specifies that carryovers, deferred income, suspended losses, and suspended deductions are includable only to the extent they were derived from California sources, calculated as if the taxpayer had been a nonresident for all prior years for the nonresident portion.
Kiddie‑tax modification and estates/trusts treatment
Subdivision (g) applies the federal kiddie tax rules to California but replaces a particular federal percentage with "1 percent" for purposes of this part; that narrows the state’s add‑on in the referenced clause. Subdivision (e) directs that estates, trusts, and common trust funds pay tax equal to what an individual with the same taxable income would pay under subdivision (a), folding fiduciary entities into the new temporary schedule.
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Every bill creates winners and losers. Here's who stands to gain and who bears the cost.
Who Benefits
- Taxpayers with incomes that fall into the new middle bands — many filers whose incomes previously sat in low middle brackets may face lower marginal rates under the temporary tables, reducing tax on incremental income during 2025–2029.
- Tax preparers and tax‑software vendors who can market simplified rate structures for the temporary period — the condensed schedule reduces the number of micro‑brackets to map, easing certain calculations once systems are updated.
- Franchise Tax Board (administratively) in the medium term if the temporary schedule reduces litigation over indexing choices, because the statute prescribes explicit brackets for the covered years.
Who Bears the Cost
- Franchise Tax Board and state IT contractors must implement new tables, the indexing exception, and the 2030 recomputation logic—work that includes systems changes, form updates, and taxpayer guidance.
- Tax software vendors, payroll providers, and accounting firms: time and expense to update product logic, client guidance, and withholding tables for the temporary schedule.
- Nonresidents and part‑year residents with complex carryover histories: limits on NOLs and carryovers tied to California‑source amounts will reduce deductions available and increase compliance complexity.
Key Issues
The Core Tension
The central dilemma is between legislative control and administrative simplicity: the bill gives explicit, temporary bracket numbers to achieve a policy outcome, removing automatic CPI indexing for a set period, but that precision imposes implementation and transition costs on the Franchise Tax Board, software vendors, employers, and taxpayers—solving one problem (indexing drift) while creating operational complexity and potential fairness questions for multi‑state filers.
The bill trades legislated numeric certainty for a disruption in the normal indexing regime. By prescribing five‑year bracket tables, the Legislature removes the simple, annually updated CPI mechanism for a defined period; that avoids the automatic creep of thresholds but forces the state and private sector to implement a one‑off rewrite and then reconcile the statutory tables with the index in 2030.
The recomputation rule for 2030 is technical and could produce non‑intuitive bracket baselines depending on how cumulative CPI changes are applied during the temporary period.
Limiting carryovers and NOL use for nonresidents to California‑source amounts aligns tax liability with source‑based income allocation, but it raises operational questions. Taxpayers with multi‑state years and suspended losses must trace origins precisely; disputes over provenance of carryover items could increase audit volume and litigation.
The kiddie‑tax tweak is narrow in text but can materially change how custodial account income is taxed at the state level and may require updating reliance positions based on federal filings.
Finally, the statute’s temporary nature creates transition costs: withholding schedules, estimated tax calculations, and taxpayer planning all need adjustments for five years and then another shift in 2030. Those toggles create administrative and compliance friction that the bill text does not fund or otherwise mitigate.
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