January
Jan 31, Form 1099-NEC + 1099-MISC due to recipients & IRS (contractors paid $600+)
Jan 31, Form W-2 due to employees
Jan 31, Form 941 (Q4 payroll) due
February
Feb 28, Paper 1099s/W-2s due to IRS/SSA (Mar 31 for e-file)
Varies, Many states' annual report filings
March
Mar 31, E-file deadline for 1099s/W-2s
Varies, State charitable registrations & renewals
April
Apr 15, Form 990 series due (orgs with fiscal year ending Nov 30)
Apr 30, Form 941 (Q1 payroll) due
May
May 15, Form 990 due (calendar-year orgs that didn't file extension)
Varies, State annual reports continue rolling in
June
Jun 30, Many fiscal years end here
Varies, State charitable solicitation renewals
July
Jul 31, Form 941 (Q2 payroll) due
Jul 31, Form 5500 (employee benefit plans, calendar year)
August
Aug 15, First Form 990 extension deadline (calendar-year orgs)
Varies, Many states' annual filings
September
Sept 30, Common fiscal year end
Varies, State charitable registration renewals
October
Oct 31, Form 941 (Q3 payroll) due
November
Nov 15, Form 990 due (orgs with fiscal year ending June 30)
Varies, State annual reports
December
Dec 31, Most common fiscal year end
Year-end, Acknowledge donor contributions ≥$250 in writing
Varies, State filings
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