Assuming you are referring to Oklahoma Form 511, Resident Income Tax Return, you can get a copy of the form and instructions here.
TurboTax also provides links to Federal and state forms and information in this tax tips article. You can complete Oklahoma returns using TurboTax.
Oklahoma filing requirements:
Resident - Every resident individual whose gross income from both within and outside of Oklahoma exceeds the standard deduction plus personal exemption is required to file an Oklahoma income tax return.
Part-Year Resident - Every part-year resident, during the period of residency, has the same filing requirements as a resident. During the period of nonresidency, an Oklahoma return is also required if the Oklahoma part-year resident has gross income from Oklahoma sources of $1,000 or more.
Nonresident - Except as otherwise provided for in the Pass-Through Entity Tax Equity Act of 2019, every nonresident with Oklahoma source gross income of $1,000 or more is required to file an Oklahoma income tax return. A nonresident partner may elect to be included in a composite partnership return; see Rule 710:50-19-1.
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