Mailing Tax Returns Near Deadline Comes With Risks

Postal Service changes mean postmark dates may not align with when you actually mail your return.

Apr. 7, 2026 at 1:09pm

Got story updates? Submit your updates here. ›

An extreme close-up of heavy, industrial postal machinery like scales, meters, and stamping devices, representing the tangible financial security and infrastructure of the tax filing process.The Postal Service's operational changes have created uncertainty around postmark dates, making it riskier to mail tax returns near the April 15 deadline.Dallas Today

As the U.S. Postal Service continues operational changes, the day you mail your tax return may not be the day it receives a postmark, which could cause issues if your return is not received by the April 15 deadline. Experts advise taxpayers to take extra precautions when mailing time-sensitive documents like tax returns, such as using certified mail or having the post office clerk manually postmark the envelope.

Why it matters

With more people still relying on the mail to file their tax returns, the disconnect between when you mail something and when it receives a postmark is a growing concern. Missing the tax filing deadline can result in costly penalties, so it's important for taxpayers to understand the risks and take steps to ensure their returns are received on time.

The details

Due to reduced mail pickups at many post offices and increased travel times for mail to reach regional processing centers, the postmark date may not align with the date you actually mailed your tax return. This is because postmarks are applied at the processing facilities, not when the mail is first accepted. As a result, your return could be postmarked a day or more after you dropped it in the mailbox, potentially causing it to be received after the April 15 deadline.

  • The IRS considers tax returns postmarked by April 15 as being filed on time.
  • In 2026 through March 27, the IRS had received 88.4 million tax returns, with 1.6 million not filed electronically.
  • In 2025, of the 165.8 million tax returns received by the IRS, about 10.9 million were not e-filed.

The players

Joshua Youngblood

Founder of The Youngblood Group in Dallas and an IRS enrolled agent.

U.S. Postal Service

The agency responsible for mail delivery in the United States, which is undergoing operational changes that are impacting postmark dates.

Got photos? Submit your photos here. ›

What’s next

Taxpayers should consider using certified mail or having the post office clerk manually postmark their tax return envelope to ensure it is received by the IRS on time. They can also explore private delivery services that the IRS accepts.

The takeaway

With the Postal Service's operational changes, the disconnect between when you mail your tax return and when it receives a postmark is a growing concern. Taxpayers need to be proactive in ensuring their returns are received by the April 15 deadline to avoid costly penalties, even if they filed and paid on time in previous years.