08/31/2026
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September 15 is an important tax deadline for many business owners.
If any of these apply to you, mark your calendar now:
βοΈ Third quarter estimated tax payments are due for self-employed individuals and business owners who make quarterly estimated tax payments.
βοΈ Extended Partnership (Form 1065) returns are due.
βοΈ Extended S Corporation (Form 1120-S) returns are due.
Missing a tax deadline can result in unnecessary penalties and interest, so it's worth taking a few minutes now to make sure you're prepared.
While we don't prepare tax returns, one of the best ways to make tax season less stressful is by keeping your bookkeeping accurate and up to date throughout the year. Clean books make the entire process smoother for both you and your tax preparer.
Have you already checked this deadline off your list? β