California: United States

California offers the largest state research credit by number of claimants. It follows the federal definitions of qualified research and qualified research expenses, limits them to research performed in California, and applies its own rate, base and limits. It is claimed on Form 3523 with the California return and administered by the Franchise Tax Board.

Overview

Who can claim

Corporations subject to the franchise or income tax, and individuals, including owners of partnerships, S corporations and LLCs taxed as partnerships, through their share of the entity's credit. The research must be performed in California and must be qualified research under section 41(d) as incorporated by California, which adopts the federal four-part test and the federal exclusions. There is no application or pre-certification; the credit is self-assessed on the return.

S corporations are a California peculiarity: the credit is computed at the entity level and only one third of it may be used against the entity's own tax, with the full credit passed through to shareholders.

Rate and calculation

The regular computation mirrors the federal regular credit at a California rate. The base amount is the fixed-base percentage multiplied by average annual gross receipts for the four preceding years, with the same 50% floor as the federal computation, and the fixed-base percentage is computed on California figures with a 16% cap. Gross receipts for the California computation are limited to sales of property delivered or shipped to a purchaser within California, which can make the California base much smaller than the federal one for a company selling nationally and so make the credit larger relative to QREs.

There is no California equivalent of the federal 280C(c) reduced credit; instead, the California deduction for research expenses is reduced by the amount of the credit unless the taxpayer elects a reduced credit under the state's own rule.

Illustrative example. Sequoia Instruments, a hypothetical company, has US$2,000,000 of California QREs. Its California gross receipts average US$10,000,000 over the four preceding years and its fixed-base percentage is 5%. The base amount is 5% of US$10,000,000 = US$500,000, which is below the 50% floor of US$1,000,000, so the base is US$1,000,000. The credit is 15% of US$1,000,000 = US$150,000, against California franchise tax, with any unused amount carried forward.

How to claim

1. Filter the federal business component and QRE workpapers for research performed in California.
2. Compute California gross receipts for the four preceding years and the fixed-base percentage on California figures.
3. Complete Form 3523, choosing the regular credit or, for taxable years beginning on or after January 1, 2025, the alternative simplified credit.
4. Attach Form 3523 to the California return and apply the credit, subject to the ordering rules for California credits and any limitation in force for the year.
5. Track the carryforward schedule; credits carry forward until used.

Deadlines follow the California return: a claim can be made on an original or amended return within the California limitation period, generally four years from the original due date.

Working with the federal claim

The state claim is built from the federal workpapers, not alongside them. Each business component in the Section G schedule carries a location, and the state qualified research expenses are the federal QREs for components, employees and contractors located in California. Two points of difference need their own working. The state base uses state figures, so prior-year California QREs and, where the method needs them, California gross receipts must be kept as a separate series from the federal ones. California conforms to the Internal Revenue Code as of January 1, 2025, but does not apply the federal research expenditure amortization changes for taxable years beginning on or after January 1, 2022 (FTB 2025 Instructions for Form 3523).

Examinations are separate. The California Franchise Tax Board can examine the state credit under its own procedures and limitation period whether or not the IRS examines the federal claim, and it will ask for the same things: the business components, the evidence for each part of the four-part test, the basis of the wage allocations and the location of the work. A single set of records, organised by business component with a location field, answers both.

Common questions

Can we claim the California credit without claiming the federal credit? Yes, where the state computation stands on its own, although the definitions are federal and the workpapers are the same, so claiming one without the other is unusual.

Our researchers work remotely from several states. Which state's QREs are they? Wages are allocated by where the employee performs the research, so remote staff need location records as well as project time records. Work performed outside California is outside the California credit even if the employee is on California payroll.

Can an amended return add the California credit for a past year? Generally yes within the state refund period, which is noted above; elections that the state requires on the original return cannot be added later.

Does a state credit affect the federal payroll tax offset? No. The federal payroll tax election is independent of any state credit, and a qualified small business can use both.

Related pages

• State credits and the federal computation
• The federal regular credit California borrows from
• Qualified research expenses
• In-House Finance Team Program: United States track