A
AcadiFi
ID
IRSPractitioner_Dan2026-04-14
eaPart 3IRS Procedures

How should I document timely mailing when sending tax documents close to a deadline?

I know the mailbox rule conceptually, but I do not trust vague advice when the deadline is close and the filing has to be defensible. I want a practical procedure answer for how practitioners should think about proof of mailing and proof of delivery.

92 upvotes
AcadiFi TeamVerified Expert
AcadiFi Certified Professional
Timely mailing questions are really evidence questions, so practitioners should use methods and records that prove when and where the item was sent...

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#irc-7502#timely-mailing#proof-of-delivery