Start with where the work occurred.
A California business address does not establish that every development expense belongs in a California research credit calculation. Begin with the projects and the locations where the research was performed. Match the activity records to the people, periods, and costs under review.
This matters when employees work remotely, teams operate across state lines, or contractors perform different parts of a project. An expense schedule that combines all development spending can hide the information needed for a state analysis. Our state credit guide explains why federal and state schedules should be coordinated but kept distinguishable.
California calculation methods need separate attention.
California offers a regular research credit and, for taxable years beginning on or after January 1, 2025, a California alternative simplified credit (ASC). California's ASC uses a 3% rate on qualifying expenses above its historical threshold; a 1.3% rule applies when any of the three prior years has no qualified research expenses. These are state rules, not the federal ASC rates.
The FTB states that the ASC election is made on a timely filed original return and that the method cannot be changed on an amended return. Ask your preparer to review the applicable election requirements before choosing a method. California research credit provisions appear in Revenue and Taxation Code §§17052.12 and 23609.
A method comparison requires reliable current and historical inputs. Identify earlier claims, any method elections, and missing years before treating a calculation as ready for the return.
Document your California research expenses.
Provide a project list, payroll detail, work-location information, contractor agreements, and the accounting records behind potentially qualifying supplies or other costs. If people moved between locations during a year, flag that fact rather than assigning the whole year to their current address.
- Identify the taxpayer and tax year for each schedule.
- Separate federal totals from California amounts.
- Explain location allocations and retain their support.
- Reconcile adjustments back to payroll or accounting records.
- List historical inputs that still need confirmation.
Consider a team with California engineers and an out-of-state testing contractor. The project description may be shared, but the expense review must address the different locations and arrangements. A percentage applied to the federal credit would not explain that analysis.
Coordinate the study with the California return.
The study package should give your accountant a clear path from activities and expenses to the state calculation. Ask your tax preparer to address Form FTB 3523, entity-specific treatment, available carryovers, and any limitations affecting use of the credit. Calculating a credit and determining how much can be used on a return are separate tasks.
Tell us if the engagement involves an S corporation, related entities, a short tax year, or an amended return. These facts help define the questions and records needed at the beginning. Keep a copy of the schedules actually used for filing, along with any changes made during your accountant's review.
Discuss your California development work.
Bring a brief description of what your team developed, where the work took place, and the tax years involved. If a federal study already exists, identify its scope and the records behind it; a California review may need additional location or historical information.
Paribus Advisors prepares federal and state R&D study packages. Call to discuss the federal and state preparation your accountant needs. We have no up-front fees; engagement terms depend on your project.