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Don’t miss these June 15 tax filing and paying deadlines

June 14, 2026
Photo by Glen Carrie on Unsplash

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June 15 is Tax Day for millions of U.S. taxpayers. Those living and working abroad must file their 1040s. And those who owe estimated tax must make this year’s second payment.

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Tomorrow — Monday, June 15 — is another Tax Day for millions of us.

The U.S. deadlines span the globe, but let’s start with the one that affects millions of us domestic filers.

Estimated tax time again: June 15 is the due date for the second estimated tax payment for this year. The amount is for earnings that weren’t subject to withholding that you (me, too!) received in April and May.

This includes both earned income from freelance or gig jobs, as well as unearned investment amounts and other payouts, such as prizes and gambling winnings. Some Social Security recipients who must pay tax on these government retirement benefits also pay that amount via estimated taxes.

The Internal Revenue Service prefers we estimated taxpayers make our added payments in four equal installments. That’s how these amounts came to be called quarterly (as in four) payments, since the IRS follows a different calendar as shown in the table below.

Payment #Due Date*For income received
1April 15Jan. 1 through March 31
2June 15April 1 through May 31
3Sept. 15June 1 through Aug. 31
4Jan. 15
of the next year
Sept. 1 through Dec. 31
*If the 15th is on a weekend or federal holiday
the estimated payment is due the next business day.

Regardless of the calendar curiosity, make your estimated tax payments on time or you could face penalties for late- and/or underpayment.

The IRS makes meeting the due dates easy. It accepts electronic estimated tax payments. You can make your e-payment via your IRS individual taxpayer account, tax software, or by credit or debit card using one of the two authorized e-payment services.

Note, however, that if you pay by plastic, the processors will tack on an added fee.

First Tax Day for some overseas filers: If you’re a U.S. citizen or resident alien, including those with dual citizenship, you must pay tax to Uncle Sam even if you’re living and working abroad.

This tax rule also applies to members of the U.S. military who are posted at facilities outside the United States or Puerto Rico.

That means that some border-bounding Americans could have two deadlines to meet tomorrow. In addition to the estimated tax deadline, it’s actual Tax Day for them.

The IRS gives foreign-based U.S. taxpayers an automatic two-month extension from the usual April 15 deadline to file their 1040 forms. U.S. Service personnel posted outside the United States or Puerto Rico are part of this extended filing time contingent.

This calendar math is more straightforward. Their later Tax Day is June 15. Again, that’s Monday. Tomorrow.

But one tax rule does remain the same for all filers, regardless of where they reside. This June 15 extension is for filing the proper tax return form, not for paying any due tax.

That means U.S. taxpayers in other countries who didn’t pay the tax they owe for the 2025 tax year by April 15 now also owe interest on that unpaid amount.

The good news, though, is that they won’t face a late-filing penalty if they file by June 15.

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So, if you’re an American taxpayer in Paris (a la Gene Kelly’s struggling artist in the classic movie musical; poster pictured above) or anywhere else in the world, get to work on that filing. Your best bet at this deadline-nearing date is to, like most of us in the United States, file it electronically.

If you just can’t meet tomorrow’s due date, no worries. Just file IRS Form 4868 instead. That will give you until the regular Oct. 15 tax-filing extension deadline. Again, be sure to pay your due tax if you haven’t already.

Finally, as long-time readers of the ol’ blog have already guessed, June 15 is today’s By the Numbers figure.

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TAX-SAVVY WAYS 
TO WRAP UP 2026

It’s over! With October’s extended filing deadline behind us, it is now time to focus on year-end moves to reduce your 2026 tax bill. 

You’ll find ways to do just that on the Tax Tips page (see the More Tax Posts drop-down menu at the top of the blog), as well as the separate tax tip pages for each month, notably October through December. If you’re on the Tax Tips page, you’ll find a monthly list at the end of this column. If you’re on another blog page, you can head straight to the October tips; at the bottom of that tips page you’ll find links to all the other 11 months’ collections of tax advice.

Not to spoil what you’ll find in that tax advice, but it does cover such things as tax deductions for charitable donations, investment moves that could reduce tax due, and ways to max out your tax-favored retirement savings. 

Finally, as the year winds down, things get hectic. There are lots of other things to occupy our time, like the much more fun upcoming holidays. But don’t lose sight of taxes, since timing is key. To be of use, most tax moves must be made by the end of the tax year. That’s Thursday, Dec. 31, which also is the last business day of the year. 

So that you don’t miss that final tax year deadline, also keep an eye on the countdown clock below. It will keep you on top of just how much time is left to make important, tax-saving moves. (Note: I’m in the Central Time Zone, so adjust accordingly for where you live.)

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