Oklahoma — Personal Income Tax

A resident individual for Oklahoma income tax purposes is a natural person domiciled in Oklahoma. Any person who spends more than seven months of the taxable year in Oklahoma is presumed to be a resident absent proof to the contrary. A person who spends less than seven months in Oklahoma is presumed to be a part-year resident absent contrary proof. Domicile is defined as a person's true, fixed, and permanent home and, once established, continues until a new domicile is established.

Source: 68 O.S. § 2353(4); Oklahoma Tax Commission, 2025 Form 511-NR Packet

Oklahoma residents must file an individual income tax return if their gross income from all sources (within and outside Oklahoma) exceeds the sum of the Oklahoma standard deduction and personal exemption for their filing status. The standard deduction and personal exemption amounts are set by statute and published annually by the Oklahoma Tax Commission, and taxpayers should always confirm the current year's thresholds before assuming a filing requirement or exemption. Okla. Admin. Code § 710:50-3-1 sets this legal requirement, but it does not specify the annual dollar amounts; official threshold amounts for each year are found in the annually published Form 511 Packet instructions or other official guidance.

For part-year residents, the obligation to file is based on the same threshold, applied to gross income earned during the period of Oklahoma residency. During periods of non-residency, the nonresident rules apply for filing obligations.

Unable to confirm 2025-specific threshold dollar amounts in the current version of Oklahoma administrative regulations or the publicly available Oklahoma Tax Commission guidance as of 2026-07-10. Taxpayers are advised to refer to the most recent Form 511 Packet or official Tax Commission publication for year-specific figures.

Source: Okla. Admin. Code § 710:50-3-1 Source: Oklahoma Tax Commission, Income Tax Help Center

Not yet human confirmed. Thresholds should be rechecked annually for legislative or administrative updates.

For tax year 2026 and subsequent years, Oklahoma imposes graduated income tax rates on individuals. Single filers and married filing separately pay 0% on the first $3,750 of taxable income, 2.5% on income from $3,751 to $4,900, 3.5% on income from $4,901 to $7,200, and 4.5% on income above $7,200. Married filing jointly, head of household, and surviving spouse filers pay 0% on the first $7,500, 2.5% on income from $7,501 to $9,800, 3.5% on income from $9,801 to $14,400, and 4.5% on income above $14,400.

House Bill 2764 (2025) includes a trigger mechanism under which all rates may decrease by 0.25 percentage points when specified revenue conditions are met, as certified by the State Board of Equalization each February. Successive certifications can reduce rates by additional 0.25-point increments until rates reach zero.

Source: Oklahoma Tax Commission, 2025 Tax Legislation Summary

For tax year 2025, Oklahoma allows a standard deduction of $6,350 for single filers and married filing separately, $12,700 for married filing jointly and qualifying surviving spouse, and $9,350 for head of household. Taxpayers who claim the standard deduction on their federal return must also claim the Oklahoma standard deduction; those who itemize federally must itemize for Oklahoma purposes.

Source: Oklahoma Tax Commission, 2025 Form 511 Packet

Every nonresident individual having Oklahoma gross income of $1,000 or more for the taxable year must file an Oklahoma income tax return, except as otherwise provided for in the Pass-Through Entity Tax Equity Act of 2019. This filing requirement is set forth in 68 O.S. § 2368(C)(2), which states that "every nonresident individual having Oklahoma gross income for the taxable year of One Thousand Dollars ($1,000.00) or more shall file an Oklahoma income tax return."

The $1,000 threshold applies to gross income from Oklahoma sources—before deductions or expenses are applied. This is a substantially lower threshold than the federal filing requirement and lower than many other states' nonresident thresholds. Nonresidents use Form 511-NR (Oklahoma Nonresident/Part-Year Income Tax Return) to report Oklahoma-source income.

Oklahoma-source income for nonresidents. According to the Oklahoma Tax Commission, a nonresident is taxed on the following sources of income: salaries, wages, and commissions for work performed in Oklahoma; income from rental of Oklahoma real or tangible personal property; income from business, trade, profession, or occupation carried on in Oklahoma; distributive shares of partnership income and S corporation income from entities doing business in Oklahoma; and gain from the sale of Oklahoma real property. Oklahoma oil and gas royalty income is also subject to Oklahoma withholding and taxation for nonresidents.

Calculation and proration method. The Oklahoma taxable income of a nonresident individual is calculated as if all income were earned in Oklahoma, using Form 511-NR. The taxpayer begins with federal adjusted gross income (AGI) and then applies the Oklahoma adjustments allowed under 68 O.S. § 2358 to arrive at AGI from all sources. The AGI from all sources is used to determine taxable income. After taxable income is calculated, it is prorated using a percentage: the Oklahoma-source AGI divided by AGI from all sources. This prorated amount yields the Oklahoma tax. This methodology ensures that nonresidents pay Oklahoma tax only on the portion of their income attributable to Oklahoma.

Exception for electing pass-through entity members. Under 68 O.S. § 2355.1P-4(E), a nonresident individual who is a member of an electing pass-through entity is not required to file an Oklahoma income tax return if, for the taxable year, the only source of income allocable or apportionable to Oklahoma for the member (or, if filing a joint return, for the member and spouse) is from one or more electing pass-through entities, and each electing pass-through entity files and pays the taxes due under the Pass-Through Entity Tax Equity Act of 2019 (68 O.S. § 2355.1P-1 et seq.).

Composite partnership returns. A nonresident partner may elect to be included in a composite partnership return in lieu of filing an individual Oklahoma return. The Oklahoma Tax Commission has promulgated rules for partnership composite returns; see OAC 710:50-19-1.

Voluntary filing for refunds. Nonresidents who do not have an Oklahoma filing requirement but had Oklahoma tax withheld or made estimated tax payments may file Form 511-NR to claim a refund of those payments.

Source: 68 O.S. § 2368

Source: 68 O.S. § 2355.1P-4

Source: 68 O.S. § 2358

Source: Oklahoma Tax Commission, 2025 Form 511-NR Packet

Source: Oklahoma Tax Commission, Income Tax Help Center

Oklahoma individual income tax returns are generally due on April 15 following the close of the calendar year, consistent with the federal deadline. Under 68 O.S. § 2368(H)(1), all individual returns filed on paper (except corporate returns and individual returns filed electronically) on a calendar-year basis shall be due on or before the fifteenth day of April following the close of the taxable year. The statute further provides that if the Internal Revenue Code provides for a later due date for individual returns, the Oklahoma Tax Commission shall accept returns filed by that later date and treat them as timely filed.

Electronic filing deadline extension (administrative). The Oklahoma Tax Commission grants an administrative extension for individual taxpayers who file their Oklahoma return electronically. According to the Tax Commission, if you file your return electronically—through a preparer or the internet—your due date is extended to April 20. This five-day extension is an administrative accommodation, not a statutory requirement. The Tax Commission further states that any payment of taxes due on April 20 must be remitted electronically in order to be considered timely paid; if the balance due on an electronically filed return is not remitted electronically, penalty and interest will accrue from the original April 15 due date.

Federal automatic extension. Oklahoma administratively honors the federal automatic extension when no additional Oklahoma tax is owed. The Oklahoma Tax Commission states: "If you have a valid extension of time to file your federal return and no Oklahoma tax is owed, your federal extension automatically extends the due date of your Oklahoma return." A copy of the federal extension must be enclosed with the Oklahoma return when filed. This policy recognizes that the Oklahoma return cannot be completed until the federal return is completed.

Oklahoma-specific extension (Form 504-I). When a taxpayer's federal return is not extended or an Oklahoma tax is owed, an extension of time to file the Oklahoma return can be granted by filing Form 504-I, Application for Extension of Time to File an Oklahoma Income Tax Return for Individuals. According to the form instructions, an extension of time to file is not an extension of time to pay the tax. The extension will not be granted unless 90% of the tax liability is paid on or before the original due date of the return.

Form 504-I sets forth the following requirements:

• An extension cannot be granted for more than one-half the accounting period covered by the individual (i.e., a six-month extension for calendar-year filers).
• Applications for extensions of time must be postmarked on or before the due date for filing the income tax return, or before the expiration of the automatic federal extension.
• When the Oklahoma return is filed, a copy of the Oklahoma extension (Form 504-I) must be attached.
• If the extension payment is made electronically through the Oklahoma Taxpayer Access Point (OkTAP), the taxpayer should not mail Form 504-I; when filing the income tax return, the taxpayer should provide the electronic payment confirmation.

Military exception. Form 504-I provides that an automatic extension, without request, is granted to members of the active military service serving outside the United States or confined to a hospital. This extension is granted to the 15th day of the third month following their return to the United States or their release from a hospital.

Weekend and holiday adjustments. Although not specified in 68 O.S. § 2368, the Oklahoma Tax Commission follows standard administrative practice that when a filing deadline falls on a Saturday, Sunday, or legal holiday, the deadline is extended to the next business day.

Source: 68 O.S. § 2368

Source: Oklahoma Tax Commission, Help Center – Income Tax

Source: Form 504-I, Application for Extension of Time to File

For Oklahoma individual income tax purposes, each taxpayer may claim a personal exemption of $1,000 for themselves, their spouse (if filing jointly), and each dependent for tax years 2025 and 2026.

Amount per exemption. The personal exemption is set at $1,000 per individual claimed. This applies to the taxpayer, their spouse (if married filing jointly), and each qualifying dependent. For example, a married couple filing jointly with two dependent children may claim four personal exemptions totaling $4,000. This amount is deducted from Oklahoma adjusted gross income to calculate taxable income for state tax purposes.

Consistency across tax years. There is no statutory adjustment for inflation or automatic increase scheduled through at least tax year 2026. The exemption amount has remained $1,000 for several years. Unless changed by future legislation, the $1,000 figure applies for both tax year 2025 and 2026.

Authority and application. The amount is set by Oklahoma statute, confirmed in current Oklahoma Tax Commission guidance, and used in the calculation of state tax withholding. The exemption also applies to the determination of filing requirement thresholds (see the filing-requirements-residents section above) and the calculation of Oklahoma taxable income.

Source: Oklahoma Tax Commission, Exemptions Source: Oklahoma Tax Commission, 2026 Withholding Tables

Not yet human confirmed. Amount should be rechecked annually for legislative updates.

For tax year 2025 (returns due April 2026), Oklahoma imposes a graduated individual income tax based on filing status. The official rate schedule for 2025, as published by the Oklahoma Tax Commission, is as follows:

Single or Married Filing Separately

• $0 – $1,000: $0.00 plus 0.25% of amount over $0.00
• $1,001 – $2,500: $2.50 plus 0.75% of amount over $1,000
• $2,501 – $3,750: $13.75 plus 1.75% of amount over $2,500
• $3,751 – $4,900: $35.63 plus 2.75% of amount over $3,750
• $4,901 – $7,200: $67.25 plus 3.75% of amount over $4,900
• $7,201 and over: $153.50 plus 4.75% of amount over $7,200

Head of Household; Married Filing Jointly; Qualifying Widow(er)

• $0 – $2,000: $0.00 plus 0.25% of amount over $0.00
• $2,001 – $5,000: $5.00 plus 0.75% of amount over $2,000
• $5,001 – $7,500: $27.50 plus 1.75% of amount over $5,000
• $7,501 – $9,800: $71.25 plus 2.75% of amount over $7,500
• $9,801 – $14,400: $134.50 plus 3.75% of amount over $9,800
• $14,401 and over: $307.00 plus 4.75% of amount over $14,400

These brackets apply to taxable income after Oklahoma deductions and exemptions. Filers should always use the year-specific tax tables published by the Tax Commission, as rates may be changed legislatively from year to year.

Source: Oklahoma Tax Commission, Pay Taxes – Individuals (2025 Tax Rates)

Not yet human confirmed.

Oklahoma requires individuals (and certain other taxpayers) to make quarterly estimated income tax payments if they expect their income tax liability to exceed the amount withheld by $500 or more for the year. This is the payment obligation threshold: if your estimated Oklahoma tax owed (after subtracting withholding and refundable credits) is $500 or greater, you must pay estimated tax.

Due Dates: Estimated payments for calendar-year taxpayers are due in four roughly equal installments: April 15, June 15, September 15, and January 15 of the following year. If the fourth payment is made by January 31 with the return, that installment is waived. Fiscal-year filers adjust accordingly. [68 O.S. § 2385.9]

Safe Harbor to Avoid Underpayment Penalty: To avoid an underpayment penalty, you must pay the lesser of (a) 70% of your current-year Oklahoma tax liability or (b) 100% of your prior-year Oklahoma tax liability through a combination of estimated payments and withholding. If this is done, no penalty applies, even if you ultimately owe additional tax when you file. [68 O.S. § 2385.9]

Farming Exception: If at least two-thirds of your gross income is from farming (measured using either the current year or the prior year), you are not required to make estimated tax payments. "Gross income from farming" is not further defined in current Oklahoma administrative code, but generally refers to total receipts, not profits. [OAC 710:50-13-5]

Under $1,000 Exception (OTC Practice): The Oklahoma Tax Commission will not assess underpayment interest if your total income tax liability for the year, after credits and withholding, is under $1,000. This threshold is reflected in official OTC publications and forms, though it does not appear verbatim in statute.

Authority references:

• 68 O.S. § 2385.7 (who must pay, $500 threshold)
• 68 O.S. § 2385.9 (due dates; safe harbor)
• OAC 710:50-13-5 (farming exception, measurement period)
• OTC Help Center – Income Tax (implementation practice including $1,000 exception)
• OTC Individuals – Pay Taxes (summarizing penalty, due dates, $1,000 exception)

Source: 68 O.S. § 2385.7 Source: 68 O.S. § 2385.9 Source: OAC 710:50-13-5 Source: Oklahoma Tax Commission: Income Tax Help Center Source: OTC – Individuals: Pay Taxes

Not yet human confirmed.

Oklahoma House Bill 2764 (2025) establishes an automatic mechanism under which individual income tax rates decrease by 0.25 percentage points if specified revenue conditions are met, as certified by the State Board of Equalization (BOE). The law sets out a detailed process for determining when and how the reductions occur:

Statutory revenue conditions for trigger:

1. The "income tax rate reduction threshold" is defined each year as the estimated twelve-month revenue loss from reducing each individual income tax bracket by 0.25 percentage point, multiplied by 1.25 (to create a margin of safety). This figure is calculated by the Tax Commission and reported to the BOE.
2. The BOE, in its regular December meeting, makes a preliminary certification comparing (a) "base year total collections" (total General Revenue Fund receipts attributable to individual income taxes for the twelve months ending the previous June 30) with (b) "comparison year total collections" (for the twelve months ending in the current year).
3. If, in December, comparison year collections exceed base year collections plus the threshold amount, a trigger event is tentatively met. The BOE must then, in its regular February meeting, make a final certification that the condition remains satisfied.
4. Upon final certification each February, all individual income tax rates are reduced by 0.25 percentage points for the tax year beginning the following January 1. Further reductions are possible in successive years if the condition is repeatedly met, until all rates reach zero.
5. For the December 2026 certification (affecting 2027 rates), the law adds two requirements: (a) revenues for July 1–mid-December 2026 must be at least 95% of the prior February's certified estimate; and (b) no revenue failure must have been declared for that fiscal year under 62 O.S. § 34.49.

Effective date and process:

• The process repeats annually. Each February, rate reductions become effective the next January if the trigger is confirmed.
• If the required conditions are not satisfied in a given cycle, rates are not reduced for that year.

Source: 62 O.S. § 34.103 (as amended by HB 2764, 2025) Source: 68 O.S. § 2355 (as amended by HB 2764, 2025)

Not yet human confirmed. December 2026 requirements should be reconfirmed with tax commission guidance as the date approaches.

Oklahoma House Bill 2764 (2025) establishes a multi-step fiscal trigger mechanism that reduces individual income tax rates by 0.25 percentage points when specified revenue conditions are met. The exact revenue or fiscal threshold, the process for determination and certification, and the timing and method of public announcement are as follows:

Definition of threshold and calculation

• The "income tax rate reduction threshold" is calculated each year as the estimated twelve-month revenue loss resulting from a 0.25% reduction in all individual income tax rates, multiplied by 1.25. The Oklahoma Tax Commission (OTC) provides this estimate to the State Board of Equalization (BOE) each December. [62 O.S. § 34.103(B)(2)]

Certification process

• At its regular December meeting, the BOE makes a preliminary certification by comparing total General Revenue Fund receipts from individual income taxes for the most recent twelve-month period (ending June 30) to the prior year’s receipts. If tax collections in the "comparison year" exceed the "base year" by at least the threshold amount, a tentative trigger event is recorded.
• The BOE reviews this condition again at its regular February meeting. If the revenue condition is still met, the BOE issues a final certification, officially triggering a 0.25-point rate reduction for the following January 1. This process repeats annually until all rates reach zero or the trigger criteria are not met.
• For the December 2026 certification (governing 2027 rates), two additional requirements apply: (a) receipts for July 1–mid-December 2026 must be at least 95% of the estimate certified by the BOE in the most recent February; and (b) there must not have been a General Revenue Fund revenue failure declared for that fiscal year. [62 O.S. § 34.103(B)(2),(H)]

Public announcement and applicability timing

• The BOE’s February certification is a matter of public record and published in official meeting minutes on the Oklahoma Office of Management and Enterprise Services (OMES) website. Rate reductions take effect the following January 1. Taxpayers and practitioners should consult the BOE's published minutes and the Oklahoma Tax Commission website for official public notice of an impending rate change. The Oklahoma Tax Commission typically updates tax tables, guidance, and public notices following a BOE certification.
• The law’s effective date for this trigger mechanism is for certifications beginning in December 2025, affecting tax rates for calendar year 2026 and later.

Source: 62 O.S. § 34.103 (as amended by HB 2764, 2025) Source: 68 O.S. § 2355 (as amended by HB 2764, 2025)

For tax year 2026, Oklahoma offers several significant state-level individual income tax credits and deductions in addition to the commonly referenced Oklahoma Earned Income Tax Credit (EITC), retirement exclusions, and Social Security exemptions. The most commonly-claimed Oklahoma-specific credits and subtractions are detailed below, with statutory and form references:

Oklahoma child tax credit / child care credit: Oklahoma provides a nonrefundable credit for taxpayers with Federal Adjusted Gross Income (FAGI) of $100,000 or less. The credit is equal to the greater of:

• 5% of the federal child tax credit allowed (including both refundable and nonrefundable portions); or
• 20% of the federal child care credit (Child and Dependent Care Expenses Credit as claimed on IRS Form 2441).

Only one may be claimed; taxpayers calculate both and take the larger amount. This credit is computed on Form 511, typically on Schedule 511-C (2026 Form 511 Packet, p.8; 68 O.S. § 2357(A)). The credit is nonrefundable and may not be carried over.

Deduction for Oklahoma 529 plan contributions: Oklahoma residents can deduct up to $10,000 per individual or $20,000 for joint filers for contributions to the Oklahoma College Savings Plan (OCSP) or OklahomaDream 529 Plan for the tax year of contribution, with excess contributions eligible for carryforward deduction for up to five subsequent years. Only contributions to Oklahoma-sponsored plans qualify. The deduction is reported on Schedule 511-B (2026 Form 511 Packet, p.7; 68 O.S. § 2358(A)(31)). Qualified withdrawals are not subject to Oklahoma income tax.

Sales Tax Relief Credit: Oklahoma's Sales Tax Relief Credit provides $40 per household member for qualifying residents with FAGI below statutory thresholds, provided they are not claimed as a dependent on another return. This credit is computed on Form 511, p.19 (68 O.S. § 2357.3A).

Credit for the Elderly or Disabled: Modeled after the federal credit, this may be available for taxpayers meeting federal eligibility and income limits. See Form 511 Packet, p.20 and 68 O.S. § 2357(A)(1).

Previously covered credits/subtractions:

• Oklahoma EITC: Refundable, 5% of federal EITC (68 O.S. § 2357.43).
• Retirement exclusions: Up to $10,000 retirement exclusion per taxpayer, full exemption for military retirement income, full exemption for Social Security (68 O.S. § 2358, OAC 710:50-15-49).

For all credits/deductions, amounts and procedures should be confirmed annually in the Form 511 Packet.

Source: Oklahoma Tax Commission, 2026 Form 511 Packet Source: 68 O.S. § 2357 Source: 68 O.S. § 2358 Source: Okla. Admin. Code § 710:50-15-49

Not yet human confirmed. All thresholds and computational details should be rechecked against official Form 511 Packet and statute annually.

Oklahoma law entitles taxpayers to interest if the Oklahoma Tax Commission (OTC) does not pay an approved individual income tax refund within a set statutory period. The applicable interest rate and the start date for accruing interest depend on both how and when the return was filed.

Processing periods before interest accrues:

• For returns filed electronically for tax years 2021 and after, interest begins to accrue if the refund is not paid within 45 days after the later of the return due date or the date a complete, correct return is filed.
• For returns filed on paper and postmarked by the statutory due date, the OTC has 90 days before interest accrues (applicable for returns for 2016 and after).
• If the paper return is filed after the due date, or if the refund arises from an amended return or claim, interest begins to accrue 120 days after the later of (1) the return due date or (2) the filing date of a complete, correct return or claim.

Interest rate:

• For non-litigated claims, the rate is the same as that charged by the OTC on delinquent tax payments as set forth by the Oklahoma Secretary of Finance and updated annually (see 68 O.S. § 217).

Litigation cases (statutory interest):

• If refund payment is ordered following litigation under 68 O.S. § 2374 (proceedings under the Uniform Tax Procedure Code), interest is paid at a flat rate of 6% per annum from the date of tax payment to the refund’s issuance. This statutory rate supersedes the general administrative interest rate.

Exceptions (when interest is NOT owed):

• If the refund is intercepted for payment of debts owed to state or federal agencies, child support, or other official offsets.
• If the taxpayer’s return is under protest, audit, or litigation, the OTC is allowed additional time to process payment before interest applies.
• Additional exceptions are listed in OAC 710:50-9-3 and should be consulted for rare scenarios.

In summary, electronic filers typically see interest accrue after a delay exceeding 45 days, while paper filings generally face 90- or 120-day thresholds depending on circumstances. The interest rate is the annual delinquency rate for most claims, or 6% for refund cases arising from litigation. Practitioners should always consult the current versions of OAC 710:50-9-3 and relevant statutes to confirm present-day rates and timings, as these can change year to year.

Source: OAC 710:50-9-3 (Refund Interest; Thresholds and Exceptions) Source: 68 O.S. § 2374 (Uniform Tax Procedure Code – Interest on Refunds)

Not yet human confirmed as of 2026-07-10.