If you bought a rental in LA and ran a cost segregation study, your federal return probably shows a very large first-year deduction. Your California return will not. California never adopted IRC Section 168(k), so bonus depreciation does not exist for FTB purposes. Same building, same money, two different deduction schedules.
What California Actually Allows
For most rental real estate, California wants straight MACRS over the normal recovery period: 27.5 years residential, 39 years commercial, plus the shorter lives for the 5-, 7-, and 15-year components a cost seg breaks out. No 100% first-year writeoff. California Section 179 limits are also far below the federal number, so that workaround does not rescue the state return either.
The practical result: your federal Schedule E and your California return stop matching in year one, and they stay mismatched for decades.
You Are Now Keeping Two Sets of Books
Not two sets in the shady sense. Two depreciation schedules, per property, per asset class, run side by side for the life of the asset. Every year the state schedule keeps depreciating what the federal schedule already wrote off, and the gap between the two closes a little.
Most of the messy returns I clean up have the same cause. Someone ran the federal numbers, copied them to the state, and moved on. The FTB adjustment shows up years later, with interest.
The Real Bill Comes When You Sell
Because you took more depreciation federally, your federal adjusted basis is lower than your California basis. Lower basis means more gain. So on the same sale, at the same price, your California gain is smaller than your federal gain, and the recapture math is different on each return.
Track that difference every year. If you only reconstruct it at closing, you are guessing at a number the FTB can check. The same issue follows you into a 1031 exchange, where the two carryover bases drift apart, and into California AMT and passive loss limits, which run off the state figures.
What To Actually Do
Have your preparer produce a federal and a California depreciation schedule for every property, every year, and keep both. Ask for the state basis, not just the federal one, before you sign a purchase or sale contract. And model the state result before you pay for a cost segregation study. The study is often still worth it, but the payoff is a federal timing benefit, not a California one, and that changes how much cash you should expect to see.
If you own California property and only one depreciation schedule exists, that is worth a look before the next filing season. Happy to walk through your schedules. Book a 30-minute consultation.