Oklahoma State Tax Calculator (2026)

How Oklahoma taxes income

Oklahoma charges 2.5% to 4.5%. State tax is a separate calculation from your federal return rather than a share of it — Oklahoma sets its own schedule and its own definition of taxable income.

• Top marginal rate: 4.5%, reached at $7,200 for a single filer
• Brackets: 3 graduated bands, starting at 2.5% above $3,750
• Standard deduction: $6,350 single / $12,700 joint
• Personal exemption: $1,000 single, $2,000 joint, $1,000 per dependent (not applied here)

Rate figures are as of January 1, 2026 and come from the published Tax Foundation compilation; they have not been independently checked against Oklahoma Tax Commission. States do change rates mid-year, so confirm a figure there before relying on it.

What catches people out in Oklahoma

• Oklahoma has 3 brackets for a single filer, from 2.5% up to 4.5%, and the first band starts at $3,750 rather than at zero — income below that is untaxed.
• Oklahoma doubles every bracket floor for joint filers, so a married couple is taxed the same as two single filers on the same combined income and the schedule carries no marriage penalty.
• The Oklahoma standard deduction is $6,350 for a single filer and $12,700 for a couple filing jointly. It is a separate figure from the federal standard deduction and usually much smaller, so itemising is a decision you make once federally and again for the state.
• House Bill 2764 collapsed Oklahoma's six brackets into three and cut the top rate from 4.75% to 4.5% effective 1 January 2026. The brackets are NOT indexed for inflation. The same law created a trigger to phase the income tax out in 0.25-point steps when revenue conditions are met.

What this estimate leaves out

Three things are deliberately outside this calculation, because they change more often than annually and a confident wrong number does real damage on a tax page.

• The personal exemption — $1,000 single, $2,000 joint, $1,000 per dependent — is not applied, so the figure runs slightly high.
• Local and city income tax is not included. New York City is the significant one nationally.
• State-specific credits, subtractions and income addbacks are out of scope and can move the result either way.

If you have income in India, Oklahoma is where treaty relief runs out

States are not parties to the India-US tax treaty, and a state credit for "taxes paid to other jurisdictions" almost always means other US states rather than other countries.

So NRO interest, Indian rental income or a gain on Indian shares can be taxed by Oklahoma with no credit for the Indian tax deducted at source — even though Form 1116 largely neutralises that same tax federally.

The treatment is not uniform across states, so treat this as the general position rather than as Oklahoma's confirmed one, and check the credit rules with Oklahoma Tax Commission before relying on relief.

Sources

• Tax Foundation — 2026 State Income Tax Rates and Brackets
• Oklahoma Tax Commission — the authority for Oklahoma