Guide

Certified mail: the cheapest insurance in tax mail

A tax answer that misses its deadline usually doesn't lose on the law — it loses on proof. The tax code hands you the proof for the price of a postage upgrade: under 26 U.S.C. § 7502, the postmark on a properly mailed, certified answer is treated as the filing date. Here is how to make that protection real.

The three pieces

The certified-mail receipt, stamped by the post office with the date. This stamp — not the green card — is the legal proof of when you mailed it.
The return receipt (the green card), which comes back signed. It proves arrival; keep it stapled to the receipt.
Your copy of the exact packet, assembled before sealing. Receipt + card + copy = one folder, one notice, closed forever.

The rules that make it count

Address it exactly as the letter directs — the IRS address on your notice, not a general one.
Mail it by the deadline, from a post office counter, and watch the stamp go on. A mailbox drop the night before is a story, not a stamp.
Registered or certified mail and IRS-designated private delivery services (specific UPS/FedEx/DHL services) qualify under § 7502; ordinary first-class mail does not create the postmark presumption.
Keep the proof permanently. Collection fights resurface years later; the folder outlives the memory.

Tax Court petitions

The same postmark rule protects a Tax Court petition mailed by day 90 — one of the few forgiving features of that unforgiving clock. The 90-day page shows how the pieces fit.

The letter is decoded. Now answer it right.

The free decoder tells you what the letter means and when it is due. The Kit is the doing: response letters for every notice family, the penalty-relief scripts, the payment-plan and Offer in Compromise reality checks, and the proof habits that keep a sent letter from becoming a lost argument.

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One-time payment. No subscription. Education only — we are not a tax firm, and this is not tax advice.

Questions

Is email or the IRS website ever proof?

Upload portals and fax lines give confirmations — keep screenshots and fax confirmation pages with the same folder discipline. For statutory deadlines, certified mail's statute-backed postmark rule remains the gold standard.

What if the green card never comes back?

Your stamped certified receipt still proves mailing, and tracking shows delivery. The card is the belt; the receipt is the suspenders — wear both, rely on either.