Missing tax deadlines can be costly for entrepreneurs. Penalties, interest, and cash-flow disruptions often stem from simple calendar oversights. Staying compliant starts with knowing the most critical tax dates that affect your business.
Key Deadlines to Track
- January 15 – Final estimated tax payment for the prior year (if applicable)
- March 15 – S-Corporation and Partnership tax returns due
- April 15 – Individual tax returns, C-Corporation returns, and first quarterly estimated payment
- June 15 / September 15 – Estimated tax payments
- October 15 – Extended individual returns due
Employers must also monitor payroll tax deposits and Form 941 quarterly filings. Missing these deadlines can trigger IRS notices and penalties quickly.
How to Stay Ahead
- Use calendar reminders or accounting software alerts
- Work with a tax professional to estimate quarterly payments accurately
- File extensions when necessary—extensions prevent late-filing penalties but not late payments
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Proactive deadline management protects your business, cash flow, and peace of mind.
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