New Postmark Rule Puts Pasadena Paper Tax Filers at Risk on Deadline Day

Pasadena residents mailing paper tax returns today face a hazard that did not exist a year ago: a return dropped in a blue collection box on April 15 may not be postmarked until April 16 or later, and the IRS will treat it as filed late.

A USPS rule effective Dec. 24 formalized the change. Under Section 608.11 of the Domestic Mail Manual (FR Doc. 2025-20740), postmarks now reflect when mail is first processed at a regional sorting facility — not when a customer deposits it. That undermines the “timely mailed, timely filed” protection under Internal Revenue Code Section 7502, which treats a return as on time if the envelope is postmarked by the deadline.

The IRS’s Taxpayer Advocate Service warned on April 8 that filers should not rely on a mailbox alone. One in five taxpayers lives in a rural area where delays are more pronounced; mail originating more than 50 miles from a processing center may be postmarked one to three days late. A late-postmarked return can trigger a 5 percent failure-to-file penalty per month on unpaid tax (up to 25 percent), a 0.5 percent failure-to-pay penalty per month (up to 25 percent), and interest at 6 percent annually, compounded daily, with no cap.

Blue collection boxes, letter carriers, self-service kiosks and lobby slots after hours no longer guarantee a same-day postmark. To secure one, go to a USPS retail counter and request a free manual “round-date” stamp — ask the clerk to place it in a clean area to avoid legibility issues — or pay for postage to receive a Postage Validation Imprint, a white rectangular sticker recording the acceptance date. Certified Mail, which tax experts call “the gold standard,” produces a dated receipt. Registered Mail, the highest level of USPS accountability, provides a chain-of-custody receipt. The IRS also accepts specific FedEx, UPS and DHL services listed at irs.gov/filing/private-delivery-services-pds.

All six Pasadena post offices are open today:

•  600 Lincoln Ave. (main);
• 281 E. Colorado Blvd. (Plaza Pasadena);
• 967 E. Colorado Blvd. (Catalina);
• 99 W. California Blvd. (Orangewood);
• 1355 N. Mentor Ave. (Jackie Robinson); and
• 3016 E. Colorado Blvd. (East Pasadena).

Most close retail windows at 5 p.m. The main office has conflicting hours across sources; call (626) 304-7164 to confirm. No extended hours have been announced. Arrive before the retail window closes, not just before the last collection time.

California state returns carry the same postmark risk. Taxpayers not ready to file can submit IRS Form 4868 by midnight for a six-month extension to Oct. 15, but taxes owed must still be paid today. The Taxpayer Advocate Service recommends electronic filing as the safest option.

“If you’re close to a deadline, don’t rely on a mailbox — go inside the post office, and get proof of your mailing date,” the Taxpayer Advocate Service wrote.

This article is for general information only and is not tax, legal or financial advice. Consult a qualified tax professional before making any decisions based on the information presented here; Pasadena Now assumes no responsibility for any actions taken or penalties incurred.