Startup tax deadline calendar
Most startup tax penalties are calendar problems, not money problems. Three answers below and you get every upcoming federal and state deadline for your company, soonest first.
Upcoming deadlines
Q4 estimated tax paymentfederal
Quarterly estimated income tax, required once you expect to owe $500+ for the year.
December 15, 2026
60 days
Form 1099-NEC to contractorsfederal
Due to every US contractor you paid $600+ during the prior year, and to the IRS, by January 31.
January 31, 2027
107 days
Form W-2 to employeesfederal
Due to employees and the Social Security Administration by January 31 (your payroll provider usually files these).
January 31, 2027
107 days
Delaware franchise tax + annual reportstate
Delaware corporations owe franchise tax and a $50 annual report by March 1. Use the Assumed Par Value method - the default notice is usually far too high.
March 1, 2027
136 days
Form 1120 - corporate income tax returnfederal
Due the 15th day of the 4th month after your fiscal year end. File Form 7004 by this date for an automatic extension.
April 15, 2027
181 days
Q1 estimated tax paymentfederal
Quarterly estimated income tax, required once you expect to owe $500+ for the year.
April 15, 2027
181 days
Q2 estimated tax paymentfederal
Quarterly estimated income tax, required once you expect to owe $500+ for the year.
June 15, 2027
242 days
Q3 estimated tax paymentfederal
Quarterly estimated income tax, required once you expect to owe $500+ for the year.
September 15, 2027
334 days
Form 1120 - extended deadlinefederal
Final deadline if you filed a Form 7004 extension. The extension moves the paperwork, not the payment - tax owed was still due at the original date.
October 15, 2027
364 days
Standard deadlines only, computed for the next occurrence of each date. Weekends and federal holidays roll deadlines to the next business day, and this list does not cover payroll tax deposits, sales tax, or registrations in states where you do business but are not incorporated. The authority's own calendar is the final word.
Never track a deadline again
Every date on this list - plus payroll, sales tax, and the states you expand into - is tracked, prepared, and filed by Vecty, with CPA review.
Book a free call to hand it overMore free tools
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