California FTB notice decoder

FTB 4600: California asks where your tax return is

An FTB 4600 Request for Tax Return means the Franchise Tax Board has no record of a California return from you for the year shown and believes you may have had a filing requirement. You have 30 days from the notice date to file the return or explain why you did not need to. Respond in the window and this usually ends quietly; ignore it and California escalates faster and more expensively than the IRS does.

General information, not tax or legal advice. Deadlines and dollar figures below reflect what the Franchise Tax Board publishes and can change; the controlling dates are the ones printed on your own notice. ClearChoiceRadar is not affiliated with the Franchise Tax Board or any government agency.

Where you are in California's collection sequence

Why you got it

The FTB's own wording: it does not have a record of your California personal income tax return, and its records indicate you may have a filing requirement. That sweeps in real non-filers, but also people who moved away and kept California-source income, nonresidents with rental or business income in the state, and people whose federal filing simply never had a California companion.

This is a request, not yet an assessment. Nothing is owed by the notice itself. What matters is the 30 day response window printed on it.

Your three clean responses

File the missing return if you were required to file. If you already filed, or you were not required to file, the notice comes with a Reply to FTB form built for exactly those answers, and the FTB runs an online response portal for the same purpose.

If you respond that you had no filing requirement, be ready for a possible follow up called a Request for Information (PIT 4044) asking for substantiation, with its own 30 day window.

If you ignore it

The FTB assesses you from its own records

The FTB states that without a response within 30 days it will assess tax based on available information, adding interest and a delinquent filing penalty. Income records without your deductions, credits, or basis almost always produce a larger number than a real return would. The next letter in the sequence, the FTB 4601 Demand, brings a penalty the IRS process simply does not have.

FTB 4600 questions

Is the FTB 4600 the same as the Demand for Tax Return?

No. The 4600 is the Request for Tax Return, the softer first letter. The Demand for Tax Return is FTB 4601, and it carries the threat of a 25% demand penalty on top of late filing penalties if you do not respond. The names are commonly confused, including by sites that cite the 4600 number for the demand letter.

What if I was not required to file a California return?

Say so, in the window. The notice includes a Reply to FTB form for exactly that answer, covering situations like income below the filing threshold or full-year residency elsewhere with no California-source income. Keep proof of your facts, since the FTB can follow up with a Request for Information asking for substantiation.

I moved out of California years ago. Why is the FTB writing to me?

California-source income reaches nonresidents: rentals, business income, partnership interests, deferred compensation, and part-year residency questions are common triggers. Responding with your facts beats ignoring it, because an FTB assessment made without your side of the story becomes collectible and California collects for 20 years.

Sources: FTB: Letters index (Request for Tax Return, FTB 4600), FTB: Penalties and interest. The deadline that governs your case is the one printed on your notice.

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