Oklahoma pass-through entity tax election: the two March deadlines

As of mid-March 2026, two separate windows for the Oklahoma pass-through entity tax election are open at the same time, and most owners we talk to are aware of only one. That overlap is the reason we're writing about this now rather than in the fall.

The election lets a partnership or S corporation pay Oklahoma income tax at the entity level instead of passing the income through to its owners' personal returns. The reason anyone bothers is federal: the entity-level payment is a business deduction, which sidesteps the individual cap on state and local tax deductions. Since that cap changed in 2025, the math behind the election changed too.

What follows is how we think about the decision, in the order the questions actually come up: who can elect, what the election does, when it has to be filed, what the federal cap looks like now, and who should be careful.

What the election is, mechanically

Oklahoma's version comes from the Pass-Through Entity Tax Equity Act of 2019. Any pass-through entity required to file an Oklahoma partnership return or an Oklahoma S corporation return may elect to become an electing PTE. The entity then computes its own Oklahoma tax on a supplement schedule, Form 587-PTE, and pays it.

The rate isn't a single number. Each member's distributive share of the entity's Oklahoma net entity income is taxed at the rate that would apply to that member. For the 2025 forms, that's 4.75% for individual and trust members and 4% for corporate, S corporation, and partnership members. The Commission's rule ties the individual figure to the highest marginal individual income tax rate, so the number on the form follows whatever the top bracket is for that year.

On the owner side, the income the entity already taxed doesn't get taxed again. A member may exclude the Oklahoma income or loss covered by the election from personal Oklahoma taxable income, attaching a schedule that lists the electing entity, its FEIN, the federal and Oklahoma amounts covered, and a copy of the Commission's acknowledgement letter. A first-year member also attaches the Form 586 itself.

Two side effects worth knowing

The election switches off Oklahoma's nonresident withholding requirement for the entity. The Commission's rule says the withholding obligation doesn't apply once a qualifying partnership or S corporation elects to pay at the entity level, and the S corporation instructions add that an electing entity doesn't file the nonresident shareholder agreement form because the nonresident shareholder won't need to file an Oklahoma return on that income.

Estimated payments follow. The S corporation packet says an entity paying tax at the corporate level must make estimated payments when its expected tax for the year is $500 or more. An electing PTE that made no estimates during the year should expect to reckon with that when the return is filed.

Oklahoma pass-through entity tax election deadlines: two windows in March

This is the part that gets missed. Oklahoma allows the election to be made two different ways, and the deadlines don't line up.

Window one: the stand-alone Form 586

A stand-alone election form may be filed at any time during the preceding tax year, or within two months and fifteen days after the beginning of the current tax year. For a calendar-year entity that wants the election in place for all of 2026, that window runs from the start of 2025 until roughly mid-March 2026.

Miss it, and the stand-alone route for 2026 closes. The entity can still file Form 586 later in 2026, but then it's electing for 2027.

Window two: the election on the return

Beginning with tax year 2024, the Commission also accepts the election on the income tax return itself, made prior to, but not later than, the due date of the applicable return, with Form 586 attached. Oklahoma partnership and S corporation returns are due 30 days after the federal due date, and a valid federal extension automatically extends the Oklahoma return when no Oklahoma liability is owed.

So in March 2026 an entity that never elected for 2025 can still do so, by making the election on its 2025 return before that return's due date. An entity that doesn't want 2025 but does want 2026 files the stand-alone form instead. Two routes, two windows, one month.

Here's the practitioner's edge: the return-based route is made after the fact, which means you already know the year's numbers before you decide. That's a genuine advantage over most planning decisions. The stand-alone route commits you before the year's income exists. Either way the election is binding until revoked, so an election made on the 2025 return carries into 2026 unless the entity revokes it within the window described below. When an owner's income swings hard between years, we prefer deciding after the fact and treat the stand-alone form as a convenience for entities with steady, predictable Oklahoma income.

Revocation is not symmetrical

The election is binding until revoked by the entity or by the Commission. Revocation happens only on Part 2 of Form 586; it cannot be made on a return. If the revocation is filed within the same two-months-and-fifteen-days window, it takes effect on the first day of the current tax year. After that, it takes effect the first day of the following year.

Separately, the Commission can revoke the election on its own if the entity's taxes go unpaid. An entity that elects and then stops paying can find itself involuntarily bounced back to owner-level taxation, with owners who no longer expect the income on their returns.

Why the federal cap still matters, and what it is now

The federal reason for the election traces to a 2020 IRS notice. Notice 2020-75 confirmed that a partnership or S corporation is allowed a deduction, in computing its own taxable income, for state income tax it pays on its own liability, and that any such payment is not taken into account in applying the SALT deduction limitation to any individual owner. Treasury said it intended to issue regulations to that effect, and the notice applies to payments made on or after November 9, 2020, with an option to apply it to earlier post-2017 payments.

Put simply, the state tax comes off the top of the K-1 income rather than landing on the owner's Schedule A, where a cap would limit it.

The cap after the 2025 legislation

Public Law 119-21, enacted July 4, 2025, rewrote the individual cap. For tax years beginning after December 31, 2024, the limitation is $40,000 for 2025 and $40,400 for 2026, then 101 percent of the prior year's amount for 2027 through 2029. In 2030 it returns to $10,000. Married individuals filing separately get half.

The cap phases down for higher earners. The limitation is reduced by 30% of the amount by which modified adjusted gross income exceeds $500,000 for 2025 and $505,000 for 2026, with the threshold rising by 101 percent each year after that. The reduction can't push the cap below $10,000. The 2025 Schedule A instructions confirm the same numbers on the worksheet: $40,000 ($20,000 married filing separately), reduced above $500,000 ($250,000 married filing separately), never below $10,000 ($5,000).

Who benefits, and who doesn't

At bottom, the election is a state-tax timing and character move that produces a federal deduction. Whether it's worth the administrative weight depends on which side of the cap an owner sits.

• Owners over the phase-down threshold. An owner with modified AGI well above the threshold is back at a $10,000 cap. For that owner, the entity-level deduction is doing nearly the same work it did before 2025, and the election is usually the clearest win in the room.
• Owners below the threshold with modest state taxes. A $40,000 cap covers a lot of Oklahoma income tax plus property tax for many households. If the owner's total state and local taxes already fit under the cap, the election adds compliance cost and delivers little federal benefit. It may still be neutral, but "neutral plus paperwork" is not a reason to elect.
• Entities with nonresident owners. The switch-off of Oklahoma nonresident withholding is real, but the nonresident owner still has a home-state return, and how that state credits an entity-level Oklahoma tax is a home-state question. We treat the credit issue as a threshold question before anyone discusses the federal side.
• Entities with mixed owner types. Because corporate members are taxed at the corporate rate and individual members at the top individual rate, the entity-level tax isn't uniform across the cap table. Operating agreements that allocate tax distributions need to account for that, or one class of owner ends up funding another's state tax.

The counter-considerations we raise every time

Oklahoma's side of this deserves a fair reading. Oklahoma is collecting the same tax from a different taxpayer; the state isn't giving anything away. What the election changes is federal, and federal law can change again. The current cap already schedules its own drop back to $10,000 in 2030, and the deduction rests on a notice and the regulations it promised rather than on a statute written specifically for it.

There's also a cash-flow and governance point. Once the entity pays the tax, the owners' personal estimated payments should come down, and the entity's should go up. Entities that elect without changing distributions end up double-funding state tax for a year, which is annoying, or under-funding it, which draws a Commission notice and can lead to revocation.

And the acknowledgement letter is not decorative. Owners must attach it to claim the exclusion. An entity that elected but never received or filed the letter has owners who can't easily prove their exclusion if their personal return is questioned.

How we think about the decision this month

We start with the owners, not the entity. For each owner we ask whether their modified AGI puts them near or over the phase-down, how much state and local tax they already deduct, and whether they file in another state that has to credit an Oklahoma entity-level tax. Only then do we look at whether the entity's income is predictable enough for a stand-alone election or volatile enough to prefer the return-based route.

If the answer is yes for 2025, the election on the 2025 return is the move, and the return's due date is the deadline. If the answer is yes for 2026 as well, a stand-alone Form 586 filed within the mid-March window locks it in without waiting a year. If the answer is no, the entity does nothing and revisits before next March.

This is the point where an operating agreement, a tax distribution clause, and a federal deduction become a single problem rather than three. If your company is weighing the election or has a cap table that makes the arithmetic uneven, reach us through the contact page or the Oklahoma City office. A conversation before the window closes tends to be a good deal cheaper than fixing a missed or mistimed election after it.

This article is general information about Oklahoma, Texas, and federal law, not legal advice, and it does not create an attorney-client relationship. Facts matter; talk to a lawyer about yours.