This is Not Good | New Postmark Rules Could Delay Mailed Tax Payments, Dodge County Treasurer Warns

"...A recent U.S. Postal Service rule change means that mail sent more than 50 miles from a regional processing center—like Milwaukee or Minneapolis—won’t be postmarked when it’s dropped off. Instead, it’ll be stamped a day or two later when it reaches the processing facility.

That delay could cause problems for taxpayers because Wisconsin law says mailed tax payments are considered on time