A recent policy change by the United States Postal Service could affect how postmark dates are applied to outgoing mail—and that may have important implications for individuals mailing time-sensitive legal documents.
Beginning in December 2025, the USPS began applying postmarks at regional processing centers instead of local post offices under a new rule known as Rule 608.11. Because mail may take additional time to reach these processing facilities, the official postmark date may no longer match the day a document was placed in the mail.
For legal filings, including probate and estate administration paperwork, the postmark date is often used to determine whether documents were submitted on time. If a document is mailed before a deadline but receives a later postmark, it could create complications.
Individuals working through estate matters should be especially cautious when mailing:
· Court filings and legal documents
· Tax filings or payments sent to the IRS
· Contractual notices or legal correspondence
· Applications or forms with hard submission deadlines
Read more on our website here.
Our probate attorneys in Ann Arbor often advise clients to plan ahead when sending important legal paperwork. Visiting the post office and requesting a manual timestamp or using certified mail can help provide proof of mailing dates.
If you’re navigating probate or estate administration and have questions about deadlines or required filings, our legal team can help guide you through the process and ensure your documentation is handled properly. Contact us today to schedule a consultation!

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