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Tax Calendar

Know what's coming
before it arrives.

ProCFO keeps track of every deadline so your calendar doesn't have to be a source of anxiety. Peak season months are highlighted. Book early.

✓ All Major Federal Deadlines
✓ Estimated Tax Payments
✓ Non-Profit 990 Dates
✓ Year-End Planning Windows
2026 Tax Calendar

Every deadline that matters.

Tax laws change frequently , consult a tax professional for current guidance specific to your situation. Contact ProCFO →

Peak Season
January
Jan 31: W-2 & 1099 Deadline
Kick off tax season. W-2s and 1099s due to recipients. Time to gather documents and book your appointment early. Demand peaks now.
Peak Season
February
Tax Season in Full Swing
Individual tax prep peaks. Common deductions reviewed. Especially important for self-employment, rental income, investments, and prior-year job changes.
Peak Season
March
Mar 15: S Corp & Partnership Returns
S Corporation and partnership tax returns due. Final push for business owner tax prep and year-end retirement contributions for self-employed.
Peak Season
April
Apr 15: Individual & C Corp Deadline
The primary filing deadline. Q1 estimated tax payment also due. Extension to file does NOT equal extension to pay. Don't wait until the last week.
May
May 15: Non-Profit 990 Deadline
Form 990 due for calendar-year nonprofits. Late filings jeopardize tax-exempt status and donor trust. We manage this proactively for our clients.
Jun – Aug
Jun 15: Q2 Estimated Tax Due
Mid-year tax planning window. Reviewing financials, adjusting withholding, planning major purchases. The best time to reduce next April's bill.
September
Sep 15: Q3 Estimated + Extended Returns
Third quarter estimated payment due. Extended S Corp and partnership returns due. Year-end planning season starts. Don't wait until December.
Oct – Dec
Oct 15: Extended Individual Returns · Dec 31: Year-End
Last extended individual filings. Then the year-end push: charitable giving, retirement contributions, loss harvesting, bonus depreciation. Act before December 31.
Individuals

Key dates for individuals

  • Jan 31 W-2 and 1099 forms due to you
  • Apr 15 Federal income tax return or extension
  • Apr 15 Q1 estimated tax payment
  • Jun 15 Q2 estimated tax payment
  • Sep 15 Q3 estimated tax payment
  • Oct 15 Extended individual returns due
  • Dec 31 Year-end tax planning window closes
Individual Services →
Businesses

Key dates for businesses

  • Jan 31 W-2s due to employees; 1099s due
  • Mar 15 S Corp & Partnership returns due
  • Apr 15 C Corp return due
  • Sep 15 Extended S Corp/Partnership returns
  • Oct 15 Extended C Corp returns
Non-Profits

Key dates for nonprofits

  • May 15 Form 990 due (calendar-year filers)
  • Aug 15 990 extension deadline
  • Nov 15 Final 990 extension deadline
Never Miss a Deadline

ProCFO keeps track so you don't have to.

Tax laws change every year. Stephen has been navigating those changes since the 1980s. His clients don't have to keep up because he does it for them.

📞 630-681-9020Schedule Consultation