Oklahoma — Corporate Income / Franchise Tax

Oklahoma imposed a corporate income tax and a separate franchise tax on corporations through tax year 2023. For taxable years beginning after December 31, 2021, and prior to 2024, Oklahoma corporate income tax was imposed on every corporation doing business within the state or deriving income from Oklahoma sources at a flat rate of 4% (as codified in 68 O.S. § 2355(H)). This tax applied to both domestic and foreign corporations with Oklahoma-source business activity and was measured by Oklahoma taxable income starting from federal taxable income with state statutory adjustments.

Effective for tax year 2024, Oklahoma's franchise tax was fully repealed—no franchise tax return or filing is required for 2024 and after. This repeal was enacted by the Oklahoma Legislature in 2023 (HB 1039X) and confirmed by published guidance from the Oklahoma Tax Commission. No corporation is responsible for filing the former franchise tax return (Form 200) or remitting franchise tax for any period after tax year 2023.

More significantly, Oklahoma's corporate income tax is also legislatively eliminated beginning with tax year 2024. New legislation, adopted in 2025 (SB 292), repeals the corporate income tax and bank privilege tax for taxable years beginning on or after January 1, 2026, effective November 1, 2025. However, as of the 2024 filing season, the state has suspended corporate income tax collection, and no tax or filing obligation applies for 2024 or subsequent years—even before the statutory repeal's effective date. This cessation is confirmed in contemporaneous legislative announcements and administrative guidance.

In summary:

• For tax years prior to 2024: Both corporate income tax (4% of Oklahoma taxable income) and franchise tax applied.
• For tax year 2024 onward: No franchise tax or corporate income tax applies to any corporation. The legal repeal of corporate income tax is effective for tax years after 2023, confirmed by session law effective November 1, 2025, and is administratively applied immediately for 2024 forward.

Source: 68 O.S. § 2355(H) (Pre-2024 Rate, Corporate Income Tax) Source: HB 1039X (2023 Session) / OTC 2023 Legislative Update, Franchise Tax Repeal Source: OTC Franchise Tax Guidance Source: SB 292 Int. (2025), Corporate Income Tax Elimination

Oklahoma corporate income tax returns are due no later than 30 days after the due date established under the Internal Revenue Code. For calendar-year C corporations, the federal corporate income tax return is due on April 15 under the IRC, which means the Oklahoma return is due by May 15. Fiscal-year corporations follow the same 30-day rule measured from their federal due date. This rule applies to tax years beginning on or after January 1, 2016.

Source: 68 O.S. § 2368(H)(4) & (5)

A corporation has nexus with Oklahoma and is subject to corporate income tax if it engages in one or more specified activities in the state. Oklahoma Admin. Code § 710:50-17-3 lists nexus-creating activities including: (1) maintaining any business location (office, warehouse, sales location); (2) owning inventory held by a distributor or non-employee representative for filling orders; (3) usual or frequent solicitation by employees or representatives with authority to accept orders; (4) usual or frequent employee activity in purchasing or performing services (construction, installation, assembly, repair); (5) operating mobile stores (e.g., trucks with driver-salespersons); (6) performance of construction or service contracts; and (7) other activities such as credit investigations or collections. The regulation specifies these examples are not all-inclusive. Federal Public Law 86-272 may limit Oklahoma's authority to tax certain interstate commerce.

Source: Okla. Admin. Code § 710:50-17-3

Oklahoma's corporate income tax apportionment formula for multi-state corporations has materially changed effective for tax years beginning on or after January 1, 2024.

Prior to 2024: Oklahoma apportioned income using a three-factor formula: property, payroll, and sales, with each factor weighted equally (one-third each). The apportionment percentage was calculated as the average of the Oklahoma property, payroll, and sales factors. If fewer than three factors had a denominator, the apportionment percentage was the average of only those present. Some corporations making qualifying capital investments could use an alternative weighting (property and payroll 25% each, sales 50%), but the default for most taxpayers was the equal-weighted three-factor formula.

Effective for tax years beginning on or after January 1, 2024: With the passage of House Bill 1375 (2023), Oklahoma permits most corporate taxpayers to elect single-sales-factor apportionment. Under this approach, only the Oklahoma sales factor is used to apportion income—property and payroll factors are disregarded for those who elect. Taxpayers may continue to use the three-factor formula unless they affirmatively elect the single-sales-factor method. The statutory formulas, as well as eligibility, process for election, and the interaction with other special apportionment provisions are detailed in HB 1375 and the implementing fiscal impact analysis. Please note the official text of 68 O.S. § 2358(A)(5) and Okla. Admin. Code § 710:50-17-71 may lag behind the changes pending codification but HB 1375 governs in case of discrepancy.

Authority and guidance:

• 68 O.S. § 2358(A)(5): prior law (three-factor, equal-weighted formula)
• HB 1375 (2023): establishes elective single-sales-factor apportionment effective for tax years 2024 and forward
• Okla. Admin. Code § 710:50-17-71: supports apportionment mechanics, not yet fully codifying HB 1375 changes as of June 2026

Summary: For 2023 and earlier, Oklahoma required a three-factor apportionment formula. Starting 2024, most multi-state corporate taxpayers may elect to use a single-sales-factor approach. The single-sales-factor method applies only for taxpayers who make an affirmative election; otherwise, the three-factor method remains the default.

Not yet human confirmed. Update reflects the material change adopted by the Oklahoma Legislature in HB 1375 (2023), effective for tax years beginning January 1, 2024. Practitioners should check the current session law for technical details if the codified statutes and regulations are not yet updated.

Oklahoma employs market-based sourcing for receipts from the performance of services in the sales factor of the corporate income tax apportionment formula. Service receipts are included in the Oklahoma sales factor numerator if they are "derived from customers within this state or if the receipts are otherwise attributable to this state's marketplace," pursuant to 68 O.S. § 2358(A)(5) and implementing regulation Okla. Admin. Code § 710:50-17-71.

Customer location definitions

The regulation defines "customer within Oklahoma" under a two-pronged test:

1. Business customers: A customer that is engaged in a trade or business and maintains a regular place of business in Oklahoma, or
2. Non-business customers: A customer that is not engaged in a trade or business whose billing address is in Oklahoma.

Billing address

For purposes of the non-business customer test, "billing address" means the location indicated in the books and records of the taxpayer as the address of record where the bill relating to the customer's account is mailed. This is a records-based test — the taxpayer's own books control the billing-address determination.

Application to tangible personal property vs. services

Oklahoma's market-based sourcing rule applies specifically to receipts from the performance of services. Sales of tangible personal property follow different sourcing rules under the same regulation, generally based on destination of shipment or, under the throwback rule, the location from which the property is shipped when the taxpayer is not doing business in the destination state. The service-receipts rule is distinct and should not be conflated with the tangible-property rules.

Scope limitation

The regulation specifies that Oklahoma does not allow receipts from items other than sales to be included in the sales factor, even though other types of income (royalties, interest, capital gains, and other income) are included in apportioned income. Only sales-type receipts, including service receipts meeting the customer-location test, enter the sales factor numerator.

Effective application

The market-based sourcing framework for services has been in Oklahoma's administrative regulations for a number of years and reflects Oklahoma's departure from the traditional UDITPA cost-of-performance approach for service receipts. Practitioners should apply the customer-location definitions precisely: business customers require a regular place of business in Oklahoma; non-business customers are sourced by billing address alone.

Source: 68 O.S. § 2358(A)(5); Okla. Admin. Code § 710:50-17-71

Oklahoma does not follow federal consolidated return rules by default. Instead, the state imposes distinct mandatory and elective consolidated filing requirements under 68 O.S. § 2367, depending on whether the affiliated group derives income exclusively from Oklahoma sources or has multi-state operations.

Mandatory consolidated filing — all-Oklahoma groups

If two or more corporations file federal income tax returns on a consolidated basis, and if all such corporations derive all of their income from sources within Oklahoma, then those corporations are required to file consolidated returns for Oklahoma income tax purposes. This is not elective — the filing obligation is mandatory for wholly in-state consolidated groups that file federal consolidated returns.

Separate filing permitted — multi-state groups

If two or more corporations file federal income tax returns on a consolidated basis, and if one or more of those corporations derive a portion of their income from sources outside Oklahoma, then those corporations are not required to file consolidated returns for Oklahoma income tax purposes. In other words, the default rule for multi-state consolidated groups is separate-entity filing for Oklahoma.

Elective consolidated filing — multi-state groups

The Oklahoma Tax Commission permits an affiliated group described in the preceding paragraph (multi-state groups filing federal consolidated returns) to elect to file a consolidated return for Oklahoma income tax purposes. The group must file an appropriate election in accordance with regulations promulgated by the Tax Commission.

Once an affiliated group elects to file a consolidated Oklahoma return, the election is binding. The group is required to file consolidated Oklahoma returns for all future tax years unless the Oklahoma Tax Commission releases the group from the election. Practitioners should treat the election as irrevocable absent a formal release from the Tax Commission.

Computation of consolidated Oklahoma taxable income

When an affiliated group files a consolidated Oklahoma return (whether mandatory or elective), the group's consolidated income, loss, or deductions are determined on a component-member-by-component-member basis in accordance with 68 O.S. §§ 2358 and 2362. This means that each member's Oklahoma taxable income is computed separately (applying Oklahoma modifications and apportionment rules to each member), and then the results are combined to determine the consolidated Oklahoma income tax liability. The approach differs from federal consolidated return mechanics — Oklahoma does not allow the intercompany eliminations and deferred-gain rules of the federal Treas. Reg. § 1.1502 consolidated return regime.

Okla. Admin. Code § 710:50-17-34 provides that to arrive at Oklahoma taxable income on a consolidated return, the group's consolidated income, loss, or deductions shall be determined in accordance with 68 O.S. §§ 2358 and 2362. Taxpayers filing consolidated returns must complete Form 512-TI (Computation of Oklahoma Consolidated Taxable Income) and submit a separate Form 512, pages 3–8, for each company within the consolidated group.

Distinction from combined reporting

Oklahoma's consolidated return rules under § 2367 should not be confused with combined reporting. Oklahoma does not impose mandatory unitary combined reporting for corporate income tax purposes. The consolidated return regime described in § 2367 is triggered only when corporations file a federal consolidated return and meet the in-state or multi-state criteria. Corporations that do not file a federal consolidated return generally file separate Oklahoma returns, even if they are part of a unitary business.

Source: 68 O.S. § 2367; Okla. Admin. Code § 710:50-17-34

Oklahoma applies a throwback rule to sales of tangible personal property shipped from Oklahoma into another state when the taxpayer is not taxable in the destination state. Under Oklahoma's historical statutory apportionment formula, if tangible personal property is shipped from Oklahoma and the taxpayer is not subject to tax in the destination state (i.e., not taxable there), the receipts from those sales are included ("thrown back") in the numerator of the Oklahoma sales factor. This increases the share of income taxed by Oklahoma for corporations not taxable in the destination state.

Statutory authority and mechanics (through tax year 2025)

• The throwback rule is codified at 68 O.S. § 2358(A)(5)(c):

> "Sales of tangible personal property are in this state if the property is shipped from an office, store, warehouse, factory or other place of storage in this state and... the taxpayer is not taxable in the state of the purchaser."

• The corresponding regulation (Okla. Admin. Code § 710:50-17-71) restates that sales shipped from Oklahoma to a state where the taxpayer is not subject to tax are included in the Oklahoma sales factor numerator.
• The rule applies only to sales of tangible personal property; it does not apply to sales of services or intangibles.

Scheduled repeal for tax years 2026 and after

• The Oklahoma Legislature passed SB 299 in 2024, eliminating the throwback rule for corporate income tax apportionment. The repeal takes effect for tax years beginning on or after January 1, 2026 (effective November 1, 2025). For tax years 2026 and forward, sales of tangible personal property shipped from Oklahoma to another state where the taxpayer is not taxable will NO LONGER be "thrown back" to Oklahoma. Such sales will be excluded from the Oklahoma sales factor numerator.
• Until that effective date, the throwback rule remains in force as described above.

No throwout rule Oklahoma does not apply a throwout rule; the statutory scheme is limited to the throwback rule for tangible personal property.

Authority and scheduled change

• 68 O.S. § 2358(A)(5)(c) (pre-2026)
• Okla. Admin. Code § 710:50-17-71
• SB 299 (2024 Sess.), which repeals the throwback rule for tax years 2026 and after

Not yet human confirmed. Updated July 2026 to reflect the legislative repeal of the throwback rule effective for tax years beginning January 1, 2026.

Direct answer: For tax years beginning on or after January 1, 2024, Oklahoma requires nearly all corporate taxpayers to use a single-sales-factor apportionment formula, without exclusions for any particular industry or type of business. The only exception under HB 1375 is for "qualifying corporations" that meet the capital investment thresholds ($100 million+ in Oklahoma property or certain multi-year investment and employment metrics), which are permitted to elect either single-sales-factor or the legacy three-factor formula. No industry, NAICS code, or business type—including utilities, financials, transportation, pipeline, airlines, or extractive industries—is categorically exempt from the single-sales-factor regime, and there are no statutorily enumerated industry carve-outs.

Why: HB 1375 (2023 Regular Session), effective for tax years starting January 1, 2024, amended 68 O.S. § 2358(A)(5) to impose single-sales-factor apportionment as the required formula for all corporations except those meeting the "qualifying capital investment" test. The election to use three-factor apportionment is tied exclusively to in-state investment and not to business activity or industry type. Statutory language does not create special apportionment rules for specific sectors. Corporations qualify for the election only by investment; all others must use the single-sales-factor method regardless of industry.

Source support:

• The operative law, 68 O.S. § 2358(A)(5) (amended by HB 1375), specifies the single-sales-factor method with a narrow investment-based exception. There are no cross-references or separate subsections providing industry exceptions or distinct apportionment regimes by business type. Any corporation, regardless of industry classification, may use the three-factor formula only if it meets the investment test. No Oklahoma statute, legislative session law, or regulatory guidance published as of July 2026 describes industry-based exclusions.

Caution / review status: Not yet human confirmed. This reflects the statutory text and session law as of July 2026. If future session laws or OTC publications modify the applicability of industrial apportionment methods, practitioners should consult the newest authority.

Source: 68 O.S. § 2358(A)(5), as amended by HB 1375

Oklahoma allows corporations to request an extension of time to file their state corporate income tax return, but the rules differ from federal practice and payment conditions apply.

Automatic federal extension honored—limited If a corporation obtains a federal extension of time to file (IRS Form 7004), Oklahoma will automatically honor this extension for state purposes—but only for the time period awarded by the IRS. No separate Oklahoma extension form is required if the federal extension is in place and attached to the state return upon filing. This automatic extension covers the filing of the return only and does not extend the time to pay tax due.

Oklahoma-specific extension (Form 504-C) If a corporation did not apply for a federal extension or needs additional time beyond the federal extension, it must file Oklahoma Form 504-C (“Application for Extension of Time to File”) on or before the due date of the Oklahoma return. The form may be filed for an original extension not exceeding six months from the original due date. A copy of the approved extension must be attached when the Oklahoma return is filed.

The current version of Form 504-C can be found at the Oklahoma Tax Commission site (2025 Form 504-C PDF). The previous citation to the 2023 PDF has been updated for the working 2025 PDF.

Payment requirement—extension is for filing, not payment An extension of time to file does not extend the time to pay taxes due. To avoid penalties and interest, a corporation must pay at least 90% of its Oklahoma tax liability by the original due date of the return, whether relying on a federal or state extension. Any tax not paid by the original deadline is subject to late payment penalty and interest no matter the extension status.

Legal authority and details

• The extension regime is codified at 68 O.S. § 216 and applied by the Oklahoma Tax Commission.
• Supporting details—including required procedures and the 90% payment threshold—are in the official Form 512 instructions and current Oklahoma Form 504-C.

Source: 68 O.S. § 216 Source: Oklahoma Tax Commission Form 504-C (current PDF) Source: Oklahoma Tax Commission Corporate Income Tax Form 512 Packet

Oklahoma corporations must make estimated income tax payments if their Oklahoma income tax liability is expected to exceed $500 for the taxable year. There is no fixed minimum franchise or income tax, but corporations meeting the $500 threshold must comply with the estimated payment regime for corporate income tax.

Estimated payment thresholds and safe-harbor rules A corporation is required to make estimated tax payments if its Oklahoma income tax liability for the year (after credits) will be $500 or more. The amount to be paid through estimated payments must be the lesser of:

• 70% of the current year’s tax liability, or
• 100% of the prior year’s tax liability (provided the prior year consisted of 12 months and a return was filed).

If the total annual tax due (after credits) is less than $1,000, no penalty is imposed for underpayment of estimated tax. This exemption is established by both statute and the Oklahoma Tax Commission’s instructions (see latest OW-8-ESC and Form 512 instructions).

Estimated payment schedule Estimated payments are due in four equal installments by April 15, June 15, September 15, and December 15 for calendar-year corporations. Fiscal-year filers follow these intervals based on their fiscal year. Payments are made using Form OW-8-ESC, and Oklahoma allows estimated income and franchise tax to be paid together.

Penalties for underpayment and additional late penalties If insufficient estimated payments are made, an underpayment interest penalty applies, accruing at a rate determined annually by the Oklahoma Tax Commission (consult the current year’s Form OW-8-ESC instructions or Tax Commission website for the up-to-date rate; statute does not specify an explicit percentage). No underpayment penalty applies if the tax due after credits is less than $1,000 or the safe-harbor percentage is satisfied as described above. Extensions to file the return do not waive or defer the penalty for underpayment of estimated tax.

In addition, late payment of any remaining balance due with the return is subject to a 5% penalty of the unpaid tax, plus 1.25% monthly interest until paid. These general late payment and interest charges are stipulated in the official Form 512 Packet and instructions.

Source: 68 O.S. § 2385.13 Source: Okla. Admin. Code § 710:50-13-6 Source: Oklahoma Form OW-8-ESC instructions Source: Oklahoma Tax Commission Corporate Income Tax Form 512 Packet & Instructions (2025)

Direct answer: Oklahoma imposed a separate franchise tax, distinct from corporate income tax, through tax year 2023; the franchise tax was fully repealed for tax years beginning on or after January 1, 2024. No franchise tax return or liability applies for 2024 and future years.

Why: The Oklahoma franchise tax was codified at 68 O.S. § 1203 (domestic corporations) and § 1204 (foreign corporations), and applied to every corporation (with defined exemptions) either organized in Oklahoma or qualified to do business in the state. The annual franchise tax was assessed at $1.25 per $1,000 of capital used, invested, or employed in Oklahoma. The law provided a de minimis exemption for liabilities of $250 or less, and a cap of $20,000 per year. Corporations subject to the tax were required to file an annual franchise tax return (Form 200) under 68 O.S. § 1210. In 2023, the Oklahoma Legislature enacted HB 1039X, repealing the franchise tax and its filing requirements effective for tax years 2024 onward (i.e., the last tax year for which the Oklahoma franchise tax applied was 2023). Official OTC guidance and legislative updates confirm that returns for 2024 and all later years do not need to be filed, and no tax accrues for those years.

Source support:

• 68 O.S. § 1203 (franchise tax levy, domestic corporations)
• 68 O.S. § 1204 (franchise tax, foreign corporations)
• 68 O.S. § 1205 (de minimis exemption and maximum)
• 68 O.S. § 1210 (annual statement and return)
• HB 1039X and 2023 Oklahoma Tax Commission Legislative Update (DocID 23-01), explicitly repealing the franchise tax effective for 2024 and after
• Official OTC newsroom and FAQ confirming repeal and no filings after 2023

Caution / review status: Not yet human confirmed. Legislative and administrative guidance as of June 2026 confirms full repeal; practitioners should consult the most recent session law in the event of further changes.

Source: 68 O.S. § 1203 Source: Oklahoma Tax Commission 2023 Legislative Update (PDF, "Franchise Tax repealed") Source: Oklahoma Tax Commission – Other Taxes, Franchise Tax section Source: Oklahoma Tax Commission Newsroom, July 26, 2023

Oklahoma's computation of corporate taxable income is grounded in federal taxable income, with conformity to the Internal Revenue Code as defined in Oklahoma statutes, but subject to state-specific modifications or decoupling where explicitly enacted. For tax years after 2022, the following framework applies:

1. Rolling IRC Conformity Framework Oklahoma maintains a 'rolling conformity' approach, defining "Internal Revenue Code" and related concepts to incorporate the federal provisions in effect, except where specifically modified by state law. This means that generally, changes to federal taxable income are reflected in Oklahoma unless a statute explicitly decouples or amends treatment. See 68 O.S. § 2353.

2. Bonus Depreciation – Elective State Decoupling For tax years beginning after December 31, 2021, Oklahoma law (68 O.S. § 2358.6A, enacted by HB 3418) allows corporate taxpayers to make an irrevocable election to apply Oklahoma’s own full-expensing regime to qualified property (as defined under IRC § 168(k) as of January 1, 2021). Taxpayers making this election must add back federal bonus depreciation and substitute the Oklahoma-allowed deduction. The mechanics and effective dates are reflected in both statute and corresponding state regulation (Okla. Admin. Code § 710:50-17-51). This is the principal point of decoupling from federal depreciation, and practitioners should closely follow the exact timing and election requirements found in the referenced law and rule.

3. Silence on Section 163(j), GILTI, FDII, and Related Federal Changes A review of currently published Oklahoma statutes and regulations reveals no explicit state-level decoupling or statutory modification for the following high-profile federal provisions for corporate tax years after 2022:

• Section 163(j) business interest limitation,
• Global Intangible Low-Taxed Income (GILTI) under IRC § 951A,
• Foreign-derived intangible income (FDII) under IRC § 250, or
• Related recent federal tax provisions.

For these areas, Oklahoma's conformity regime appears to incorporate federal changes except where an explicit modification (such as the bonus depreciation election) is enacted. However, this silence should not be read as an affirmative exclusion—practitioners should verify application for specific transactions using current-year statutes and regulations. No known legislative or administrative guidance modifies these federal provisions for Oklahoma corporate income tax as of the dates in the sources below.

Summary Table | Adjustment | Authority | Decoupling after 2022 | |-----------------------------------|--------------------------------------------------------|----------------------| | IRC conformity | 68 O.S. § 2353 | Rolling (statutory) | | Bonus depreciation (elective) | 68 O.S. § 2358.6A; OAC 710:50-17-51 | Yes (by election) | | Section 163(j), GILTI, FDII | Statute/reg silence (see sources) | No explicit decoupling|

Source: 68 O.S. § 2353 Source: 68 O.S. § 2358.6A Source: Okla. Admin. Code § 710:50-17-51

Not yet human confirmed. No explicit decoupling from Section 163(j), GILTI, FDII, or related provisions is found in Oklahoma statutes or regulations published as of June 2026; absence is based on primary-source review as of this date.

Oklahoma permits a net operating loss (NOL) deduction for corporate income tax purposes, but its rules differ from federal law in both calculation and availability of carryforward/carryback.

Statutory authority and computation Oklahoma NOLs are governed by 68 O.S. § 2358(A)(3), with detailed implementing rules provided in Okla. Admin. Code § 710:50-17-51. The NOL deduction is allowed only to the extent a loss results from Oklahoma-source income, and must be calculated independently of the federal NOL. The Oklahoma NOL is computed by starting with the taxable income as reported for Oklahoma purposes, after all required state-specific modifications and adjustments.

Carryforward period For NOLs incurred in tax years beginning on or after January 1, 2020, Oklahoma allows unused NOLs to be carried forward up to twenty (20) years following the year of the loss. There is no provision for longer carryforward for NOLs incurred after this date, and NOLs expire if not used within this period. Prior to this change, carryforward periods varied; 2020 and later years use this 20-year rule.

No carryback allowed Oklahoma does not permit carryback of NOLs for corporate taxpayers. All Oklahoma NOLs generated in tax years after the repeal of the carryback provision (last permitted for tax years beginning before January 1, 2008) must be carried forward only.

NOL election and statements Taxpayers claiming a NOL deduction on their Oklahoma corporate return must attach a schedule showing the computation of the NOL, the year incurred, and the amount applied to each carryforward year. Deductions must be claimed within the statutory time frames; the Oklahoma Tax Commission may disallow late or unsubstantiated claims. NOLs cannot be created or carried over from years in which the taxpayer was not subject to Oklahoma tax.

Summary table (for losses incurred 2020 and after):

• Carryforward allowed: 20 years
• Carryback: Not permitted
• Calculation: Oklahoma-sourced, independent of federal NOL
• Attach schedule: Required

Source: 68 O.S. § 2358(A)(3) Source: Okla. Admin. Code § 710:50-17-51