San Diego · Tax Preparation

Business tax preparation for San Diego startups.

Staxiom prepares and files business tax returns for San Diego startups, federal and California state, with the same team that keeps your bookkeeping current, including grant-funded, pre-revenue companies.

What's included

Federal & California filing

Business tax returns prepared and filed for both federal and California state.

Deadline monitoring

Extension filing tracked so nothing slips through.

Built on reconciled books

The same team that does your bookkeeping prepares the return.

Grant-funded companies need the same discipline, applied earlier

A Delaware C-corp doing business in San Diego still needs to foreign-qualify in California and file a state return alongside Delaware's own franchise tax. For a pre-revenue biotech company, grant income and R&D spend both need to be tracked precisely enough to substantiate the return and any credit claim, a different discipline than a typical revenue-generating company's return.

Read the full breakdown on the business tax preparation guide, or see how this looks for Los Angeles and Orange County startups.

San Diego tax preparation FAQ

Does a Delaware C-corp based in San Diego need to file in California too?

Yes, the same statewide rule applies regardless of city: a Delaware C-corp doing business in California needs to foreign-qualify with the Secretary of State and file a California return in addition to Delaware's own franchise tax filing.

Do grant-funded biotech startups have different tax prep needs?

Grant income and R&D spend both need to be tracked precisely enough to substantiate both the tax return and any R&D credit claim, which is a different discipline than a typical revenue-generating company's return. It's part of why bundling tax prep with bookkeeping matters more for a pre-revenue biotech than for a company where the books are simpler to begin with.

See what your return might be missing.

Add your revenue and website for a full review, reviewed by a CPA who ran EY's West Coast R&D Tax Credit practice for 13 years.

Get your review