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@Terry53029 wrote:

This is from Intuit.

How will the IRS know my client was affected by a disaster?

The IRS looks at the address of record on the return to apply disaster relief automatically. If the address on the return isn’t in a disaster area, but the return qualifies for another reason (like books or records being located in a disaster area), clients should contact the IRS by phone.

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That is what the IRS does, but the OP cited the California FTB saying the State return should have a note on the top of the return.