A federal Form W-2 reports your wages and the taxes withheld from your pay. For a California return, the figures in boxes 16 and 17 are especially important: the 2025 Form 540 instructions use box 16 for state wages and box 17 for California income tax withheld. If your W-2 is missing or wrong, contact your employer; California’s Franchise Tax Board (FTB) also points taxpayers to MyFTB for available wage and withholding information and to Form 3525 when the original cannot be obtained.
What a W-2 reports
Your employer issues Form W-2, Wage and Tax Statement, to report wages and salary information and taxes withheld from your pay. The FTB describes wages as earnings from an employer, which can include regular earnings, bonuses, commissions, severance pay, and tips. The form records amounts for the tax year; it is not the form you use to change withholding on future paychecks. FTB: Wages (W2)
A W-2 contains federal, state, and, where applicable, local information. The different boxes do not all represent the same tax or jurisdiction. For a California return, use California-specific entries rather than assuming that every state or local withholding amount is California income tax.
Which W-2 boxes go on a 2025 California return?
For tax year 2025, the California Form 540 instructions direct taxpayers to use W-2 box 16 for total state wages and box 17 for California income tax withheld. Enter them on the lines specified by those instructions, and follow the instructions for how to report the withholding total and whether to attach withholding forms when filing on paper. 2025 Instructions for Form 540
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- W-2 filing deadlines: Employers must file Copy A with the Social Security Administration and provide employee copies by February 2, 2026, regardless of whether they file electronically or by paper.
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- Box 16 — State wages. Use the total state wages shown for California as instructed for the state-wages line.
- Box 17 — State income tax withheld. Include the amount withheld for California in the specified California withholding total.
Do not count other-state, city, county, or local withholding as California income tax withheld. If your W-2 lists multiple jurisdictions, identify the California entries and follow the Form 540 instructions. Box numbers and return lines are year-specific; use the instructions for the return year you are filing, not a prior year’s guide.
How W-2 wages fit into California taxable income
Wage income is included in federal adjusted gross income (AGI), which is reported on a California return. California treatment is not identical to federal treatment in every situation: Schedule CA provides adjustments for certain items. The 2025 Schedule CA instructions, for example, discuss certain IHSS supplementary payments and employer HSA contributions. If one of those or another special compensation or adjustment issue applies to you, check the applicable year’s Schedule CA instructions rather than assuming the federal W-2 amount is handled identically for California. FTB: Wages (W2) and 2025 Instructions for Schedule CA (540)
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- Kit includes 50 six-part W2 forms 2025: Copies A, B, C, D, 1 and 2, plus 6 1096 forms and free access to the Helper; print code included
- Make tax season successful and easy; comes with 6 W-3 transmittal forms for summarizing and submitting W-2s to the IRS by mail; be sure to add security envelopes
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- W-2 filing deadlines: Employers must file Copy A with the Social Security Administration and provide employee copies by February 2, 2026, regardless of whether they file electronically or by paper.
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Withholding is a prepayment, not your final tax bill
Withholding is income tax paid in advance through deductions from wages. The amount depends on income subject to tax and the allowances claimed on the applicable withholding certificate. Your W-2 reports withholding already taken; a change to withholding affects future paychecks.
Federal and California withholding are handled separately. Use federal Form W-4 to adjust federal wage withholding and California Form DE 4 to adjust California wage withholding. If your goal is to change only the amount withheld for California, consult the FTB’s DE 4 guidance. FTB: Withholding and FTB: Adjust your wage withholding
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What to do if your W-2 is missing, lost, or incorrect
If you have not received it
Contact your employer first. For tax year 2025, the Form 540 instructions say to contact the employer or access MyFTB if a W-2 has not arrived by January 31, 2026. That date is specific to the 2025 instructions; check the current instructions for another tax year. FTB says only an employer can issue or correct a federal W-2. 2025 Instructions for Form 540
If you need California wage or withholding information
FTB says California wage and withholding information may be available through MyFTB. Availability of that information does not replace the employer’s role in providing or correcting the federal W-2. 2025 Personal Income Tax Booklet, Forms 540
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If you still cannot obtain the form
FTB Form 3525 is a substitute for Form W-2 in specified circumstances. Its instructions say to try first to obtain the original or corrected W-2 from the employer. The form asks for your best estimates of wages and withholding; use it only as directed by its instructions. 2025 Form 3525 Substitute for Form W-2
If information is wrong
Ask the employer to issue a corrected W-2. FTB says the employer is the party that can correct the federal form; MyFTB is not a substitute for that correction. FTB: Wages (W2)
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The FTB booklet identifies CalFile, e-filing, and paper Form 540 or Form 540NR as filing routes, subject to eligibility and your circumstances. Choose based on whether you qualify for a particular service, the complexity of your return, whether you need a resident or nonresident return, and whether you prefer electronic or paper filing. Check the booklet for the applicable year’s instructions and eligibility details. 2025 Personal Income Tax Booklet, Forms 540
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