09/01/2026
🚨 BUSINESS TAX DEADLINE: SEPTEMBER 15
If your S Corporation or Partnership filed a tax extension, your extended filing deadline is September 15, 2026.
Don’t assume an extension means you can wait indefinitely. Missing the extended deadline can become expensive.
• Late-filing penalties can add up quickly. For 2026 returns, the federal late-filing penalty for many S corporations and partnerships can be $255 per shareholder or partner, per month or partial month, for up to 12 months.
• More owners can mean larger penalties. Because the penalty is generally calculated based on the number of shareholders or partners, even a relatively small business can face significant penalties when a return is filed late.
• Late filing can also delay your K-1s. Your shareholders or partners rely on Schedule K-1 information to complete their own tax filings, and separate penalties may apply when required K-1 information isn't furnished timely.
DON’T WAIT UNTIL THE LAST MINUTE.
If your business filed an extension and you still haven't completed your return, call TAX-411 today. Our team can help you get your return prepared and filed by the deadline and help you avoid unnecessary penalties and fees.
📞 (562) 869-4000
TAX-411 — COUNT ON US
11455 Paramount Blvd., Suite A
Downey, CA 90241
