Procrastinating on Taxes? Discover Why Last-Minute Filing Could Cost You Big!

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As millions of Americans scramble to file their taxes by the April 15 deadline this Wednesday, they might unknowingly be heading straight into an expensive pitfall, even if they believe everything is in order.

A recent change at the United States Postal Service (USPS) could result in your tax return being considered late by the IRS, despite mailing it on time, effectively moving the deadline up a day.

The IRS determines the timeliness of your return based on the postmark date, not the date you drop it in the mailbox. A return postmarked April 15 or earlier is deemed on time.

However, new USPS regulations mean the postmark might not accurately reflect the mailing date. Consequently, a tax return sent on April 15 might receive a postmark indicating it’s late, potentially leading to hefty penalties.

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Until recently, you were more or less guaranteed to get a postmark on the day you sent a piece of mail, but because of the Postal Service changes, that’s no longer true.

Last December, the Postal Service warned that customers should expect delays between when they drop off mail and when it receives a postmark – up to one day or more, in some cases. 

That means if you waited until April 15 to mail your tax return, you might not get a postmark until a day later – or more.  The IRS late filing penalty is typically 5 percent of the unpaid tax for each month – or part of a month – that a tax return is late, capped at 25 percent of the total unpaid tax.

‘The core issue is that taxpayers assume the day they drop a return in the mailbox is the day it gets postmarked,’ Joshua Youngblood, an IRS enrolled agent, told CNBC. ‘That has never been guaranteed, but it matters more now than ever.’

Last December, the Postal Service warned that customers should expect delays on postmarks

IRS enrolled agent Joshua Youngblood

In the current tax season through March 27, the IRS had received 88.4 million tax returns, of which 1.6 million were not filed electronically.

Fewer and fewer Americans file their tax returns via the US Postal Service – last year less than 7 percent of tax returns were sent by mail – and most use online tax filing services like TurboTax.

Since 2021, the Postal Service has been modernizing operations to save money and boost efficiency.

A key change has been to consolidate mail processing from nearly 200 local centers to just 60 regional facilities, as well as reducing the number of dispatches between processing facilities and local post offices.

As a result, it’s much more common for mail to be postmarked with a delay of a day or more after mailing, creating new risks not just for tax filing, but also elections and legal deadlines that depend on postmark dates.

When the IRS receives a tax form after a deadline, the postmark date determines whether the submission is considered timely, and whether late filing or late payment penalties may apply.

Filing tax returns on time means you avoid late fees and other penalties.

Be aware that you can request a tax filing extension – which also must be received by the IRS before the April 15 tax day deadline – even if you can’t pay some or all of the taxes you owe.

Last year fewer than 7 percent of tax returns were sent by mail

Fill out IRS Form 4868 to request an extension of time to file your income tax return. 

You can file the form using an online tax platform or send it by mail – but be mindful of the delays discussed above, as the extension must have a postmark dated no later than April 15.

The extension will let you file your return by October 15, 2026.

Be aware that this only extends the time you have to file your return without penalties. 

A tax extension doesn’t extend the time to pay a balance due, although most taxpayers have their tax withheld from paychecks throughout the year.

Since the beginning of the 2026 tax season, the IRS has refunded more than $221 billion to taxpayers – up more than 13 percent from the total amount refunded one year ago.

At $3,521, the average tax refund amount is 11 percent higher than last year, according to the latest IRS update on tax season 2026.

The IRS has received 88.4 million individual returns, out of about 164 million expected through the April 15 deadline.