Understanding Postmarks

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The Amador County Tax Collector's Office would like to remind taxpayers that property tax payments must be received or postmarked by the delinquency date to avoid penalties.  If a payment is received after the delinquency date, with no postmark, the payment is considered late, and penalties will be imposed in accordance with State Law.  Taxpayers who send their payments by mail are cautioned that the United States Postal Service (USPS) only postmarks certain mail depending on the type of postage used, and may not postmark mail on the same day it is deposited by a taxpayer.

POSTMARKS are imprints on letters, flats, and parcels that show the name of the USPS Office that accepted custody of the mail, along with the state, zip code and date of mailing.  The postmark is generally applied, either by machine or by hand, with cancelation bars to indicate that the postage cannot be reused.


Standard Postage Stamps:  Stamps purchased and affixed to mail as evidence of the payment of postage.

*POSTAGE THAT IS NOT POSTMARKED:  (If you use these types of postage the USPS will not postmark your mail.  Your mailed payment must be received by the delinquency date to avoid penalties.)

Metered Mail:  Mail on which postage is printed directly on an envelope or label by a postage machine licensed by the USPS.  Many private companies use these types of postage machines.

Pre-Canceled Stamp:  Stamps sold through a private vendor, such as stamps.com.

Automated Postal Center Stamps:  Stamps, with or without a date, purchased from machines located within a USPS lobby.

Permit Imprint:  Pre-sorted mail used by bill pay services, such as online home banking.