California Form 540-ES (2014) explains estimated tax vouchers, 30-40-0-30 installments, due dates, safe harbor rules, and common errors.
FILLABLE FORMSCalifornia Form 540-ES (2013) explains worksheets, vouchers, quarterly due dates, and payment methods, so estimated tax payments post correctly.
FILLABLE FORMSCalifornia Form 540-ES (2012) explains estimated tax payments, key due dates, and underpayment penalty rules, including Form 5805 filing notes.
FILLABLE FORMSCalifornia Form 540-ES (2011) overview covering who must pay estimated tax, due dates, payment options, and how credits apply on Form 540.
FILLABLE FORMSCalifornia Form 540-ES (2010) explains quarterly estimated tax payments, due dates, and how taxpayers report credits on Form 540 or Form 540NR.
FILLABLE FORMSCalifornia Form 540X (2014) explains how to amend a California tax return, submit schedules, meet deadlines, and avoid processing delays.
FILLABLE FORMSCalifornia Form 540X (2013) instructions for amending a 2013 return, including required attachments, mailing rules, Part II explanations, and refund timelines.
FILLABLE FORMSCalifornia Form 540X (2012) explains how to amend a 2012 California tax return, report federal changes, add schedules, and avoid common filing errors.
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