Business Tax Deadlines

Staying on top of business tax deadlines is essential for avoiding penalties, interest charges, and unwanted IRS attention. Unlike individual taxpayers who face a single annual deadline, business owners must juggle multiple due dates throughout the year for income tax returns, estimated tax payments, payroll tax filings, information returns, and state-level obligations. Missing any of these deadlines can trigger automatic penalties that add up quickly.

This guide provides a month-by-month calendar of the most important business tax deadlines, organized by type of obligation. We cover federal and state income tax returns, estimated tax payment schedules, payroll tax reporting, information returns such as 1099s, and special deadlines for different business entity types. Bookmark this resource to keep your business on track all year.

The annual tax return deadlines vary by business entity type. Sole proprietors and single-member LLCs report business income on Schedule C as part of their personal Form 1040, which is due on April 15. Partnerships (Form 1065) and S Corporations (Form 1120-S) must file by March 15. C Corporations (Form 1120) file by April 15. Automatic six-month extensions are available for most returns by filing the appropriate extension form.

It is important to note that while extensions grant additional time to file, they do not extend the time to pay any tax due. Estimated payments should be sent by the original deadline to avoid interest and penalty charges. State tax return deadlines often mirror federal deadlines, but some states have different due dates or require separate extension requests. Always verify state-specific deadlines for each jurisdiction where your business operates.

Business owners who expect to owe $1,000 or more in tax must make quarterly estimated tax payments throughout the year. These payments are due on April 15 (covering January-March), June 15 (April-May), September 15 (June-August), and January 15 of the following year (September-December). Each payment should cover one-fourth of your estimated annual tax liability, though you can adjust amounts if your income fluctuates.

Corporations follow a slightly different estimated tax schedule, with payments due April 15, June 15, September 15, and December 15. Corporate estimated tax payments must cover 100% of the current year's tax liability unless the corporation qualifies as a large corporation with special rules. Use Form 1120-W for corporate estimates and Form 1040-ES for individual business owner estimates.

Payroll tax returns have their own schedule of deadlines throughout the year. Form 941 (Employer's Quarterly Federal Tax Return) is due by the last day of the month following each calendar quarter: April 30, July 31, October 31, and January 31. Employers must deposit payroll taxes on a monthly or semi-weekly schedule based on their tax liability. Form 940 (FUTA) is due annually by January 31. W-2 forms must be provided to employees and filed with the Social Security Administration by January 31.

Information returns, including Form 1099-NEC for nonemployee compensation and Form 1099-MISC for other payments, must be provided to recipients by January 31 and filed with the IRS by January 31 (or February 28 if filing by paper, March 31 if filing electronically). Missing information return deadlines can result in penalties ranging from $60 to $310 per form, depending on how late the filing is.

• Sole proprietors and C Corps file by April 15; partnerships and S Corps file by March 15 for calendar year taxpayers.
• Estimated tax payments for business owners are due April 15, June 15, September 15, and January 15.
• Form 941 payroll tax returns are due the last day of the month following each calendar quarter.
• Forms W-2 and 1099-NEC must be provided to recipients and filed with the IRS by January 31.
• Extensions extend filing time but not payment time; pay estimated taxes by original deadlines to avoid penalties.