Prepare a 2025 California resident tax return packet

A California personal return starts with the facts and documents for the tax year. If you were a California resident, gather your federal return information, wage statements, California withholding and records for any state-specific adjustments before speaking with a preparer. This guide focuses on organizing a 2025 resident return; it does not determine whether you were a resident, whether you must file or how much tax you owe.

The California Franchise Tax Board's 2025 Form 540 resident booklet contains the instructions discussed here. Do not apply 2025 amounts or line instructions to another year without checking that year's official forms.

Start with the household and the return year

Record the legal names, taxpayer identification information, filing status and dependents relevant to 2025. If a household change occurred during the year, keep the supporting dates and documents and ask the preparer how the facts affect both the federal and California returns. Protect identification information and use a verified secure method when sharing it.

The California filing-status guidance explains the available statuses and notes situations involving registered domestic partners. Ask which status applies to your own circumstances for the year; do not choose one solely because it produced a particular result in an earlier return. Supply federal filing information and any records needed to evaluate the California treatment.

If you moved during the year, tell the preparer the dates and places involved. The resident Form 540 instructions are not a substitute for deciding whether a part-year or nonresident return is appropriate. Keep housing and work-location records and ask which California form and instructions apply before using the rest of this resident-return checklist.

Gather wages and other income records

Collect every wage statement for the year, including corrected statements. The 2025 resident instructions say Form 540 line 12 uses the total state wages from all states shown in box 16 of the federal Forms W-2. Give the preparer every relevant statement rather than assuming that one California wage box is the complete line amount. If a statement appears wrong or is missing, identify it and ask how to obtain or correct it before the return is finalized.

Include interest, dividends, investment sales, retirement distributions, business income and other items that apply to your household. Give the preparer the supporting statements and ask which additional records are needed. The wage-record guide covers the separate task of identifying a missing or corrected federal wage statement; this California guide focuses on the resident state return packet.

Prepare the federal return information alongside the California records. The Form 540 instructions direct filers to complete the federal return before using the California income section and generally start the California calculation with federal adjusted gross income. Do not copy a total from an unfinished federal draft or assume that federal and state taxable amounts will always be identical.

Identify differences that need California review

The 2025 instructions describe Schedule CA (540) for California adjustments when there are differences between federal and California income or deductions. They give Social Security benefits as an example of income that can require an adjustment. Give the preparer both the federal treatment and supporting statement, then ask whether and how the California instructions apply. A difference in law does not mean every item has the same adjustment or that an adjustment is available in every case.

Review the records for deductions and credits separately. Ask whether the California return uses a standard or itemized deduction for your facts, and provide the documents needed for any state credit you intend to discuss. The booklet provides a credit chart and conditions; do not assume that a federal credit automatically produces the same California credit. A preparer should check the year-specific rules and complete any required forms.

For example, a wage earner also receives a retirement statement and has a deduction question. Provide the W-2, the retirement statement, the federal return information and the relevant receipts. Ask which amounts require California adjustments and which deduction records matter. The example organizes a question; it does not establish a deduction, credit or tax result.

Reconcile California payments and withholding

Collect California withholding statements, estimated-payment confirmations and any prior-year overpayment designated for 2025. The FTB booklet identifies mistakes in totaling or transferring withholding and in claiming estimated payments among common errors. Compare the documents and confirmations with the return before signing, and ask the preparer to investigate any mismatch. Do not treat a payment for a different year or taxpayer as automatically available on this return.

If a wage statement was corrected after preparation began, keep both versions and tell the preparer which statement replaced the earlier one. If a payment record is missing, ask how to obtain reliable confirmation. Retain any relevant real-estate withholding statement separately; a closing document alone does not establish the amount that may be claimed.

A balance due, refund or preparer's estimate is not a substitute for reviewing the entries. Ask who will verify the filing and payment method, and check the current agency instructions for the actual filing date and any applicable relief. An extension or other special circumstance should be reviewed for the particular year instead of assumed from a general checklist.

Review the return and retain the packet

Before signing, compare names, identification details, filing status, state wages, adjustments and California payments with your records. Ask the preparer to explain any difference from the federal return and to identify unresolved questions. The 2025 booklet says that a paper Form 540 has six sides and all six must be sent to the FTB with side six signed. Electronic filing follows the applicable electronic instructions; confirm the method and documentation with the preparer.

Keep a copy of the completed return, schedules, supporting documents, payment confirmations and any filing acknowledgement. If a corrected statement arrives afterward, provide it to the preparer and ask what review is needed. A later document does not by itself establish that an amended return is required.

This guide does not verify a particular preparer, fee or appointment. Use the actual year's FTB instructions and seek qualified help for residency, special income or other questions outside the packet described here.