Helpful Tools & Guides
Resources to keep you prepared.
Quick links to the IRS tools you'll use most, key tax deadlines for the year, and downloadable checklists and guides to help you get organized.
Official IRS Tools
Helpful links
Mark Your Calendar
2026 Tax Deadline Calendar
Form 1040 (Individual Income Tax Return)
Individual Extension Deadline (Form 4868)
Form 1120 (C Corporation Tax Return)
C Corp Extension Deadline (Form 7004)
2026 1st Quarter Estimated Tax Payment Due
IRA & HSA Contribution Deadline
January 15, 2026
2025 4th Quarter Estimated Tax Payment Due
January 31, 2026
W-2 & 1099 Filing Deadline
March 16, 2026
Form 1065 (Partnership Income Tax Return)
Form 1120-S (S Corporation Income Tax Return)
Business Extension Deadline (Form 7004)
April 15, 2026
May 15, 2026
Form 990 (Exempt Organization Tax Return)
Exempt Organization Extension (Form 8868)
June 15, 2026
2026 2nd Quarter Estimated Tax Payment Due
September 15, 2026
2026 3rd Quarter Estimated Tax Payment Due
Extended Form 1065 (Partnership Return)
Extended Form 1120-S (S Corporation Return)
October 15, 2026
Extended Form 1040 (Individual Return)
Extended Form 1120 (C Corporation Return)
November 16, 2026
Extended Form 990 (Exempt Organization Return)
January 15, 2027
2026 4th Quarter Estimated Tax Payment Due
Disclaimer: Tax deadlines are subject to change based on IRS announcements and federal legislation. Please consult the IRS or a qualified tax professional regarding your specific situation.
Get Organized
Tax document checklists
Individual Tax Preparation Checklist
Everything to gather before filing your personal return.
Small Business Tax Preparation Checklist
Stay ready for your business filing season.
New Business Setup Checklist
Start your new venture on the right foundation.
For Business Owners
Downloadable guides
Choosing a Business Structure
Understand the options and what they mean for you.
Small Business Owner's Guide to Tax Deductions
Common deductions you don't want to miss.