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Never miss a tax deadline again

Every major federal filing date, estimated payment, and retirement contribution deadline for solopreneurs, built for the way the tax year actually falls. Pick your year, add it to your calendar, and stop keeping this in your head.

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Subscribes to both years and stays up to date. Download 2026 instead

2 deadlines in 2026 from this month on. Dates are adjusted for weekends and federal holidays, so what you see is the real date, not just the 15th.

Marked dates are the ones worth planning around: missing them costs money, and extending them is a decision rather than a formality.

Q4

Oct to Dec
Nov 2Mon

  • 2026 Q3 payroll tax return due

    Federal and state quarterly payroll return, for entities running payroll.

    ALLPAYROLL

    Oct 31, 2026 is a Saturday, shifted to the next business day.

Dec 31Thu

  • 2026 Solo 401(k) employee contribution due

    Employee elective-deferral deadline. S Corp owner-employees must have it withheld from payroll by Dec 31; sole proprietors and single-member LLCs should lock in the election by Dec 31, with funding allowed up to the filing deadline.

    ALLRETIREMENT

Informational only, not tax, legal, or accounting advice. Deadlines are set by the IRS and adjusted here for weekends and federal holidays; always confirm specifics with a tax professional. State deadlines vary and may apply separately.

Want someone else watching these dates for you?

Collective handles your bookkeeping, filings, and payroll year-round, so these deadlines never land on your desk as a surprise.

More free tools

S Corp tax savings calculatorSee what an S Corp election would save you this year.Estimated tax & extension calculatorWork out your next quarterly payment or extension balance.S Corp vs LLC calculatorWhat electing S Corp status saves you in self-employment tax.

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