BROWN COUNTY, Wis. (WBAY) - The Brown County Treasurer’s Office is warning residents who pay property tax bills by mail about a U.S. Postal Service policy change that may affect when envelopes are postmarked.

In August 2025, the Postal Service instituted a nationwide change for when postmarks are affixed to incoming mail. Instead of postmarks being stamped when items are first handled by the Postal Service, postmarks are now applied at regional sorting centers.

“That means your postmark could be several days after you put it in your mailbox,” Brown County Treasurer Ray Suennen said. “In other words, if you plan to pay your property taxes by mail, don’t wait until right before the deadline to put it in the mail.”

Many federal and state laws define timely payment based on the USPS postmar

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