When are Estimated Taxes due? Who must pay, how to file, and all key details explained

Estimated quarterly taxes IRS payment deadlines explained: The 2026 IRS tax season is now active. Freelancers and gig workers must pay quarterly estimated taxes to avoid penalties. Key deadlines include April 15, June 15, and September 15. The final 2026 payment is due January 15, 2027. Underpayment interest remains high at 7% per year. Use Form 1040-ES to calculate your debt. Electronic payments via IRS Direct Pay are free. Stay compliant to protect your earnings.