How to File for the December 15th US Tax Extension in 2024

November 23, 2023 | | 3 minute read
Expat Tax Blog. Tax Tips for US Americans abroad.

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If you are an American living abroad and the thought of filing your US tax return for the October 15th deadline concerns you, you can take a deep breath. The IRS has another extension deadline on December 15th.

Keep in mind this additional extension is only available for those who were already granted the October 15th extension.

Necessary Tax Filing Obligation Information

Before we explain how to file for the December 15th US tax extension, we must share the standard US expat tax deadlines and extension dates.

A woman looking up on a tablet How to File for the December 15 US Tax Extension.

As an American or Green Card Holder living abroad, you must report your worldwide income if your adjusted gross income is above the filing threshold.

Expats who need to file their US taxes receive an automatic 2-month extension to report their worldwide income. We made it easy to do this via our expat tax software. However, if you owe US federal or state taxes, you’ll need to file by the typical filing deadline of April 15th.

Additionally, US expats could apply for a free tax extension or write a letter to the IRS and mail it by post to request more time to do the tax work until October 15th. However, you must fill out the free tax extension form through our software before the June 15th deadline.

Assuming you got your October extension and still need more time to finish up your US taxes, you can still file an extension for the December 15th deadline. You can do this by filing Form 1040 with additional documents we’ll explain below.

Writing and Sending a Letter to the IRS

There is no way to send an online email or message to the IRS requesting an extension to file US taxes until the December 15th deadline. Instead, you’ll have to use the traditional route of writing and mailing a physical letter to the IRS. This process is according to the current regulations by the US Treasury.

Points to write in the letter:

  • Your full name and Social Security Number
  • Which tax return or documents and the year or tax period you need to get an extension for.
  • A reason why the IRS should grant you the time to extend your tax filing obligation to December 15th (and not October 15th). This could be because it takes extra time to collect expense and income documents to prepare your 2023 tax return. Especially since you live abroad as a US citizen, and communication and mailing delays could happen. Whatever is truthful and applies to your situation should work. It’s crucial you come off confident and as a conscientious taxpayer.

Example Letter for the IRS


“I, (full name), with Social Security Number (your Social Security Number) request an extension to file Form 1040 for the 2023 tax year until December 15, 2024. The reason is ______ . I sincerely hope I can have this extension.

Best regards,

(Your name)”

Make a couple of copies of this letter to have on file!

Mailing Address of the IRS in the United States

Please send your letter in an internationally stamped envelope to

Department of the Treasury
Internal Revenue Service
Austin, TX 73301-0215

The above address would be the same as the IRS Service Center if you were to mail your US tax form. We suggest you send your letter through a private delivery service like DHL or FedEx. Using these services allows you to receive the of proof that your letter arrived safely at the headquarters.

We recommend that taxpayers send their own signed extension letter.

If you are in the Premium Tier at MyExpatTaxes, we will send out a December extension letter on your behalf if necessary. However, there is always a risk the IRS will reject it as you have not personally signed it.

Send your Letter as Soon as Possible

With the current pandemic, and shipments of Stimulus checks getting delayed for Americans abroad, we suggest not to wait and submit your letter as soon as possible. Hence, it should arrive at the IRS before the October 15th deadline.

Yes, folks, you need to have your letter in on or before October 15th of this year.

Getting no IRS notice or confirmation from the IRS about your letter as a US citizen abroad is normal. You won’t hear whether your letter was processed and the extension accepted by the IRS. But you can have a representative sign that your letter has arrived at their office, as we explained above.

Start Filing for the December 15th Deadline

Despite not receiving a confirmation you are granted the December 15th extension, you should still go ahead, and prepare and file your 2023 tax return to the IRS.

Of course, you have us at MyExpatTaxes, who can happily accept you and allow you to walk through our DIY expat tax software.

Otherwise, you can fill the tax documents manually through the following steps:

  1. Attach a copy of the letter you wrote to the IRS requesting an extension with your 2023 tax return. Write ‘’Taxpayer Abroad’’ on top of Form 1040.
  2. Mail it to the address above at your local post office.
  3. Congrats, you’re done!

Know all the US Expat Tax Deadlines


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Our team of tax professionals is not only dedicated but also friendly, ready to support you at every turn. Need reassurance about our software and service? Check out our stellar reviews on Facebook or join the conversation in American expat communities to hear what your fellow Americans abroad have to say about us. Our US tax filing process is designed to be streamlined, simple, and affordable, ensuring a hassle-free experience for you.

Written by Ellen M

November 23, 2023 | | 3 minute read

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