California’s tax system is one of the most complicated in the country. We provide fast access to forms from 2010–2025, plus guides and checklists to help you file correctly and avoid penalties.
Form 3539 (2011) is used by corporations and exempt organizations to pay California tax when filing for an automatic extension. Learn more in this guide.
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Learn how to use Form 3539 (2010) to pay your California business taxes on time while taking advantage of the state’s automatic extension type.
FILLABLE FORMSLearn how to prepare California Form 540 2EZ (2015) with clear eligibility rules, filing steps, required documents, and critical state tax credit information.
FILLABLE FORMSCalifornia Form 540NR (2010) overview for nonresidents and part-year residents, including Schedule CA allocation, withholding, deadlines, and common errors.
FILLABLE FORMSCalifornia Form 540-ES (2024) guide covering eligibility, worksheet steps, dates, Web Pay options, and penalties, for accurate estimated tax payments.
FILLABLE FORMSCalifornia Form 540-ES (2023) explains due dates, payment options, and key rules for quarterly estimated tax payments to the Franchise Tax Board.
FILLABLE FORMSCalifornia Form 540-ES (2022) outlines estimated tax thresholds, installment percentages, payment vouchers, Web Pay steps, and what happens after filing.
FILLABLE FORMSCalifornia Form 540-ES (2021) explains estimated tax vouchers, installment percentages, Web Pay options, and key rules to avoid underpayment penalties.
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