Return must be postmarked by April 15. Residents whose gross income sourced within and outside of Oklahoma exceeding their standard deduction plus any personal exemptions is required to file an Oklahoma income tax return. Individuals not required to file a federal income tax return must attach a completed federal income tax return to the state income tax return to show adjusted gross income (AGI) and deductions. For more info and gross income requirements visit: here
Part-year residents are subject to the same filing requirements as residents. They may also be subject to Oklahoma income tax on income sourced from Oklahoma during time of non-residency if $1,000 or more. Use Form 511-NR.
Nonresidents with $1,000 or more in Oklahoma sourced income are subject to Form 511-NR filing requirements.
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