Important Tax Dates 2026

Staying on top of tax deadlines is one of the easiest ways to avoid penalties, reduce stress, and keep more of your hard-earned money. Whether you're an individual filer, a small business owner, or self-employed, here's your roadmap for the key dates coming up.

• September 15, 2026 – Third quarter 2026 estimated tax payment due.

• September 15, 2026 – Business tax returns.

• October 15, 2026 – Deadline for extended individual and C corporation returns.

Coming up for 2027…

• January 15, 2027 – Fourth quarter 2026 estimated tax payment due.

• Late January 2027 – The IRS typically opens the new filing season and begins accepting 2026 returns (exact date announced closer to the season).

• February 2027 – W-2 and 1099 deadlines roll around again for the 2026 tax year.

Note: Some dates shift slightly if they fall on a weekend or holiday, and disaster relief can extend deadlines in affected areas. For the full, official list, the IRS Publication 509 tax calendar is always the definitive source.

How Four Rivers Accounting Can Help

Tax deadlines have a way of sneaking up, especially when you're busy running a business or managing a household. That's where Four Rivers Accounting comes in; our team handles tax preparation and planning, bookkeeping, payroll, audits, and business startup services, so you're never scrambling to piece things together at the last minute. We keep track of the dates that matter to your specific situation, help you plan ahead for estimated payments, and make sure your filings are accurate and on time. Whether you need year-round bookkeeping support or just want a trusted expert to handle your return this season, Four Rivers Accounting is here to help with real people who know your business, not just a piece of software.