Does a federal accounting method change automatically apply for California?
Edvin Givargis Published 6 minute read
The short answer
Only when California conforms to the law behind it. California grants no freestanding automatic consent for accounting method changes. Instead, under the Franchise Tax Board's current guidance, FTB Notice 2024-01, a taxpayer that properly obtains a federal method change receives deemed California consent if, and only if, California conforms to the underlying provision, and the taxpayer attaches a copy of the federal filing to its original California return. Where California does not conform, where the taxpayer wants a different method for California than for federal purposes, or where the federal change was granted under a nonautomatic procedure, the taxpayer must ask the Franchise Tax Board separately, and must do so at least sixty days before the original due date of the return. The trap is the gap between the two systems: a method change that is automatic federally and simply assumed for California can leave the California return on an unconsented method, which is a return the Franchise Tax Board can recompute.
Why California is different
Federal practice has trained taxpayers to think of most method changes as routine. The Internal Revenue Service publishes an annually updated list of automatic changes, currently maintained under the Rev. Proc. 2015-13 framework, and a taxpayer files Form 3115, implements the change, and computes the section 481(a) adjustment without ever receiving individualized permission. California never adopted that model. The state's position, stable across decades of guidance, is that consent to change a method of accounting for California purposes belongs to the Franchise Tax Board, and federal consent substitutes for it only through conformity: where California conforms to the federal provision at issue, a valid federal election or consent produces a deemed California election or consent under the conformity statutes (see Rev. and Tax. Code sections 17024.5 and 23051.5). The current procedural expression of that position is FTB Notice 2024-01, which superseded Notice 2020-04; the framework traces back through Notice 2000-8, with subject-specific installments along the way, including the 2017 guidance in which the Franchise Tax Board agreed to follow the federal automatic procedure for previously unclaimed depreciation and amortization, withdrawing a 1996 notice that had refused to.
The practical architecture under Notice 2024-01 has three lanes. First, the deemed consent lane: the taxpayer made a proper federal automatic change, California conforms to the underlying law, and the taxpayer wants the same method for California. Nothing is filed in advance; a copy of the federal Form 3115 goes with the timely filed original California return, and no acknowledgment arrives, because none is issued for deemed consent items. Second, the California-only lane: the taxpayer wants a change for California but not for federal purposes, or wants a different method for California. That requires a request to the Franchise Tax Board itself, filed with the Change in Accounting Periods and Methods Coordinator, using the federal forms adapted for California and identified with the taxpayer's California corporation number and a cover letter. Third, the nonautomatic lane: where the federal change itself required advance IRS consent, or where California does not conform, Franchise Tax Board consent must be requested at least sixty days before the original due date of the return for the year of change. The sixty-day rule is California's own clock, chosen deliberately so the state is not bound to federal due dates, and a return filed before required consent is obtained is grounds for denial by itself.
The conformity question is the whole analysis
Because deemed consent rides on conformity, every method change carries a threshold question that federal practice never asks: does California conform to the provision this change implements? California conforms to the Internal Revenue Code as of a fixed date, moved by SB 711 (Stats. 2025) from January 1, 2015 to January 1, 2025 for taxable years beginning on or after January 1, 2025, subject to a long list of specific decouplings. The date move reshuffles this analysis in both directions. Method changes implementing provisions California now conforms to, which previously required the California-only lane or produced permanent state adjustments, can newly qualify for deemed consent. And the standing decouplings still cut the other way: California does not conform, for example, to the federal capitalization and amortization regime for research expenditures under section 174 as amended, so a federal method change implementing that regime does not carry into California by deemed consent, and the California computation keeps its own treatment with the state adjustments that follow. The same discipline applies to any provision on the decoupling list; the federal Form 3115 attached to the California return documents the federal change, not California's agreement with it.
The section 481(a) adjustment needs the same two-system care. Where deemed consent applies and the methods align, the federal adjustment and its spread period generally carry into the California computation, but the amount can differ, because the cumulative difference between old and new methods is computed on California basis and California history, not federal. An adjustment built on years when California conformity diverged, different depreciation, different capitalization, a different conformity era, will not equal the federal number, and pasting the federal 481(a) amount into the California return is one of the recurring errors in this area. The related article on revenue recognition changes walks through that state-by-state arithmetic in more depth.
Practice notes
The failure pattern here is silence: the federal change is filed, the California return follows the new method, and nobody asked the conformity question or attached anything. Where California in fact conformed, the cure is usually just the missing attachment; where it did not, the California return is on an unconsented method and the exposure runs as long as the statute stays open, because an unconsented method change is an adjustment the Franchise Tax Board can make without sympathy. The sixty-day advance clock for nonautomatic and California-only requests is the other recurring miss, since it has no federal analog and arrives before most compliance calendars start thinking about the state return at all. A method change memo for any significant federal Form 3115 should therefore answer three California questions as a matter of routine: does California conform to the provision, does the deemed consent lane apply or is a filing to the Coordinator required, and what does the California section 481(a) adjustment actually equal on California attributes. Finally, the conformity date change enacted in 2025 makes this a good moment to revisit method items that were handled under the old date; a change that needed special California handling in 2023 may be a deemed consent item in 2025, and the reverse is true for anything newly decoupled.
This article states the law as of September 15, 2026
Statutes, rates, thresholds, and agency practice change, and a different set of facts can change the answer. Before acting on anything discussed above, contact G&G State Tax Group to confirm what has changed since this was written and how the rules apply to a specific situation.
G&G State Tax Group, LLC is a state and local tax advisory firm. The firm provides state and local tax consulting and representation in state and local tax controversies. G&G does not prepare or file tax returns, perform attest services, or provide bookkeeping, and is not a CPA firm.