2025 Tax Calendar
Key federal deadlines and Washington State B&O tax due dates for business owners and high-net-worth individuals.
January
Q4 Estimated Tax Payment Due
Final estimated tax payment for the previous tax year.
W-2 and 1099-NEC Deadline
Deadline to issue forms to employees and independent contractors.
WA State B&O Tax Due (Annual/Q4)
Annual and Q4 filers must submit Washington State Department of Revenue returns.
March
S-Corp and Partnership Returns Due
Form 1120-S and Form 1065 due, or file for a 6-month extension.
April
Individual Tax Returns Due
Form 1040 due or file for an automatic 6-month extension.
C-Corp Returns Due
Form 1120 due for calendar-year C-Corporations.
Q1 Estimated Tax Payment Due
First estimated tax payment for the current tax year.
WA State B&O Tax Due (Q1)
Quarterly filers must submit Q1 Washington State returns.
June
Q2 Estimated Tax Payment Due
Second estimated tax payment for the current tax year.
July
WA State B&O Tax Due (Q2)
Quarterly filers must submit Q2 Washington State returns.
September
Extended S-Corp & Partnership Returns Due
Final deadline for entities that filed extensions in March.
Q3 Estimated Tax Payment Due
Third estimated tax payment for the current tax year.
October
Extended Individual Returns Due
Final deadline for individuals who filed extensions in April.
Extended C-Corp Returns Due
Final deadline for calendar-year C-Corporations that filed extensions.
WA State B&O Tax Due (Q3)
Quarterly filers must submit Q3 Washington State returns.
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