1120 Oklahoma electronic filing information

State contact information

If you have specific questions about what you can e-file or about rejections you received, contact the state for more information.
Oklahoma Tax Commission
Oklahoma City, OK 73194
Email
: businessincometax@tax.ok.gov
Phone
: 405.521.3126

State electronic filing details

Grace period
None
E-filing mandate
Yes, Forms 512 and 512-S must be filed electronically
Accepts state-only filings
Yes
Return types accepted
C Corporation
S Corporation
Consolidation/Combined
Amended
Short-year
Estimated Payments (with return)
Return types not accepted
Extension
Withholding
Direct deposit of refunds
Yes, required
Accepted forms of payment
Direct debit (EFW)
Electronic funds transfer (EFT)
Check by mail
Signature requirements
ERO retains signed Form EF
Supports PDF attachments
Yes
Tax year(s) supported for e-filing
Current tax year and two prior tax years
Special considerations

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