Team
Journeys
Services
Resources
Contact
Client Center
Resources
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Deadlines to Deliver Tax Materials to ENDVR
Feb
23
Aug
10
EXTENSION
Forms Due
1065 (Partnership) & 1120S (S Corporation)
Return Filing Date:
Extended Filing Date
March 16, 2026
September 15, 2025
Mar
23
Sep
18
EXTENSION
Forms Due
1040 (Individual) & 1120 (Corporation)
Return Filing Date:
Extended Filing Date
April 15, 2025
October 15, 2026
Mar
23
Sep
18
EXTENSION
Forms Due
1041 (Estate & Trusts)
Return Filing Date:
Extended Filing Date
April 15, 2026
September 30, 2025
Apr
24
Oct
19
EXTENSION
Forms Due
990 (Nonprofit)
Return Filing Date:
Extended Filing Date
May 15, 2025
November 16, 2026
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Client Center Instructions
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Refund Tracker
Oklahoma Refund Tracker
Visit oktap.tax.ok.gov
Federal Refund Tracker
Visit irs.gov
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Pay Your Taxes Electronically
Oklahoma Tax Payments
Visit oktap.tax.ok.gov
Federal (IRS Direct Pay)
Visit irs.gov
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Government Forms
Form W-4
Employee's Witholding
Download from irs.gov
Form W-9
Tax Payer Identification
Download from irs.gov
Form I-9
Employment Eligibility Verification
Download from uscis.gov
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Website Links
Oklahoma
State Tax Comission
Visit oklahoma.gov/tax
Internal Revenue Services
Federal Tax Services
Visit irs.gov
Small Business Administration
Visit sba.gov
