If you filed for a tax extension earlier this year, the clock is still ticking. Extended deadlines aren’t a finish line, they’re a second chance to get it right. Here’s what’s coming up and what you need to know before time runs out.
Individuals: October 15, 2026
If you requested an extension on your individual return (Form 4868) back in April, your final deadline is October 15, 2026. This is your hard stop, there are no further extensions available.
One thing worth repeating: an extension only buys you time to file, not time to pay. Any taxes owed were still due April 15. If you haven’t paid, interest has been accruing since then.
Special note for expats and military: U.S. citizens living abroad received an automatic extension to June 15. Those who needed additional time beyond that should have filed for the October 15 extension.
S-Corps & Partnerships: September 15, 2026
Business entities that filed Form 7004 for an extension face an earlier deadline. S-corporations (Form 1120-S) and partnerships (Form 1065) must file their extended returns by September 15, 2026.
Again, any taxes owed were due at the original March deadline, not September.
C-Corporations: October 15, 2026
C-corporations that requested an extension also have until October 15, 2026 to file Form 1120.
What This Means for Property Owners and Businesses
If you own commercial real estate or operate a business and haven’t yet taken advantage of tax strategies like cost segregation, R&D tax credits, or Section 179D deductions, an extended filing window can actually work in your favor. There’s still time to complete a study and properly report the deductions on your return before the deadline hits.
Working with experienced specialists ensures the work is done right, and that your return is defensible if the IRS ever takes a closer look.
Don’t wait until mid-October to start. The analysis takes time, and rushing increases the risk of errors. If you’re not sure whether a tax strategy applies to your situation, a free analysis is a low-risk way to find out.
