1040 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
P.O. Box 26890
Oklahoma City, OK 73126-0890
Phone
: 405.521.3637 or 405.522.5723 or 800.522.8165 ext. 13637
Tax Refund Inquiries
: 405.521.3160 or 800-522-8165 ext. 13160

State electronic filing details

Grace period
10 days
E-filing mandate
Yes, if filing more than 10 returns
Accepts state-only filings
Yes
Return types accepted
Resident
Nonresident
Part-year
Estimate Payments
Amended
Return types not accepted
Extension
Accepts returns with these conditions
Refund
Zero balance
Balance due
Direct deposit of refunds
Yes
Accepted forms of payment
Direct debit (EFW)
Electronic funds transfer (EFT)
Credit card
Signature requirements
ERO retains signed Form 511-EF for 3 years.
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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