How long does the IRS take to process the faxed extension Form 15397?

Last modified 7/18/2025 1:01:14 AM EST

Once you complete your Form 15397, we’ll validate the information, print the extension form, and fax it to the IRS on your behalf. The IRS typically processes faxed Form 15397 within 24 to 48 hours, but delays may occur during peak filing seasons. Once approved, you’ll receive a 30-day extension to furnish recipient copies.