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27 CFR 70.305 - Timely mailing treated as timely filing.
Thus, if the cover containing such document bears a timely postmark, the document will be considered filed timely although it is received after the last date,
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PS Form 3811-A - Return Receipt
Note: This PS Form 3811-A serves to provide delivery information for a hardcopy return receipt (PS Form 3811) that was not received by the customer. It is not
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Proof of mailing | FTB.ca.gov - Franchise Tax Board
Sep 22, 2021 sent us mail, to verify its been submitted on time. The postmark date is the filing date of the tax return, document, or payment. Generally
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