September 15 is an important tax deadline for many business owners and taxpayers. Q3 estimated tax payments are due, along with extended S-Corporation and Partnership returns. It is also an important deadline for certain 2025 employer retirement plan contributions.
If you are making estimated payments, this is a good time to review your year-to-date income and withholding rather than simply relying on last year’s numbers. A quick tax projection now can help prevent surprises—and potentially avoid unnecessary penalties—when you file your 2026 return.
