Tax deadlines 2026 are here. April 15 is final. Missing it can cost up to 25% in penalties. Millions must file before Tax Day 2026 or request an IRS tax extension 2026. You can extend filing to October 15, but not payment. Unpaid taxes trigger a 5% monthly penalty, while late payment adds 0.5% plus interest. Key tax filing deadlines 2026 also include W-2 by January 31 and 1099 by mid-February. Quarterly estimated taxes 2026 start April 15. Most IRS refund status 2026 updates appear in 24 hours after e-filing. File early. Pay on time. Avoid penalties.
