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California Tax Non-Conformity: What High Earners Need to Know
California follows its own rules. Here's what doesn't carry over from your federal return, and how it changes your tax strategy math.
What 'Non-Conformity' Means
California calculates state income tax starting from your federal AGI, then makes adjustments for provisions where state law differs from federal law. These adjustments are reported on Schedule CA (540). When California 'does not conform,' it means a deduction or exclusion you claim on your federal return must be added back for California purposes. This creates a gap between your federal and state tax savings, sometimes a very large one.
Bonus Depreciation: California's Biggest Divergence
California does NOT conform to federal bonus depreciation under IRC §168(k). While the federal government allows 100% first-year expensing of cost-seg-reclassified assets, California requires you to use standard MACRS depreciation schedules. On a $1M property where cost seg reclassifies $216K: federally, you deduct $216K in year one. For California, you depreciate those same assets over 5, 7, and 15 years. Your year-one CA deduction might be $45K instead of $216K, a $171K difference. At CA's 13.3% top rate, that's a $22,700 difference in state tax savings.
QBI Deduction: Not Recognized
The Qualified Business Income deduction under IRC §199A allows a 20% deduction on qualified business income from pass-through entities. California does not conform to §199A. If you claim a $40K QBI deduction on your federal return, you must add it back on your CA return. This means the QBI deduction reduces your federal taxes but not your California taxes. For S-Corp owners and self-employed earners, this is a significant gap.
SALT Cap: Different Treatment
The federal SALT cap ($40,400 MFJ under OBBBA) limits your deduction of state and local taxes on Schedule A. California does not conform to this cap for state purposes, but the practical impact is different than you might expect. On your CA return, you cannot deduct CA state income taxes at all (no state deducts its own income tax). You can deduct property taxes and local taxes without the federal cap, but the net effect for most CA high earners is similar because the income tax exclusion was already in place before the SALT cap existed.
What California DOES Conform To
California conforms to: (1) Passive activity rules under IRC §469, including the STR material participation exception. This is critical, as it means STR losses are non-passive for BOTH federal and CA purposes. (2) Standard MACRS depreciation schedules. (3) 1031 exchange rules for CA properties (though there are filing requirements for out-of-state exchanges). (4) HSA and 401(k) contribution limits. (5) Most charitable deduction rules. The STR strategy conformity is particularly important, it means the core strategy of deducting rental losses against W-2 income works at the state level, even though the depreciation amount differs.
How to Calculate Your True CA Savings
For any tax strategy, calculate federal and state savings separately. Federal savings: use federal depreciation rules (including bonus), federal brackets, and federal-specific deductions. CA savings: add back bonus depreciation, add back QBI deduction, apply CA brackets (up to 13.3% + 1% Mental Health Services Tax above $1M). A strategy that saves $80K federally might only save $25K at the state level due to non-conformity. Your total savings is the sum, but don't assume the state savings mirror the federal calculation. This is where many online calculators get it wrong.
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Frequently Asked Questions
Does California's non-conformity make STR strategies less valuable?
It reduces the STATE-level savings but doesn't eliminate the strategy. The federal savings from cost seg + bonus depreciation are unchanged. The STR strategy itself (passive loss recharacterization) works at both levels. A CA high earner still saves significantly, just less than someone in a conforming state like New York or a no-income-tax state like Texas. Expect about 60-70% of the total savings you see quoted in generic STR guides.
Should I buy my STR outside California to avoid non-conformity?
Buying in a no-income-tax state (NV, TX, FL, AZ) means the rental income isn't subject to another state's income tax, and your federal deductions are unchanged. However, your CA state tax savings are still limited by non-conformity on depreciation, owning the property out of state doesn't change how CA treats the deductions on your CA return. The main advantage of out-of-state is avoiding double state taxation on rental income.
Will California ever conform to bonus depreciation?
Unlikely in the near term. California has never conformed to federal bonus depreciation since it was introduced in 2001. The state budget relies on the additional revenue from disallowing accelerated depreciation. Legislative proposals to conform have been introduced but never passed. Plan for non-conformity to be permanent.
How do I report the non-conformity on my CA return?
Use Schedule CA (540) to make the adjustments. For bonus depreciation, add back the difference between federal bonus depreciation and CA MACRS depreciation in Column B (Subtractions from federal amounts) or Column C (Additions to federal amounts). For QBI, add back the full §199A deduction in Column C. Your CPA or tax software should handle this, but verify the adjustments, errors here are one of the most common sources of CA audit triggers for high earners.