Missouri's PTET Election in 2026: A SALT Parity Act Guide

If you own a Missouri S corporation or partnership, the state will tax your share of the business income at the top individual rate — currently 4.7% — one way or another. The SALT Parity Act election simply decides who writes the check: you, on your individual return, or the business itself, on a separate entity-level return. That single choice can be worth thousands of federal tax dollars, because tax the entity pays is deductible against the business income before it ever reaches your Form 1040.

Here is how Missouri's pass-through entity tax (PTET) works in 2026, who should elect it, and the filing traps that catch first-timers.

How the SALT Parity Act Works​

Missouri's SALT Parity Act (Section 143.436, RSMo) has allowed partnerships and S corporations — including LLCs taxed as either — to elect entity-level taxation since tax year 2022. The mechanics:

1. The entity elects annually by filing Form MO-PTE, the Pass-Through Entity Income Tax Return. A separate election is required every year, and once made it cannot be revoked for that year.
2. The entity pays Missouri tax at the top individual rate. On the 2025 return that rate is 4.7% (Form MO-PTE, Line 10). The rate tracks Missouri's top individual bracket, which steps down 0.1% at a time when state revenue triggers are met — so always confirm the current-year figure in that year's MO-PTE instructions.
3. Each member claims a credit for their pro rata share of the tax the entity actually paid. You claim it on your own Missouri return with Form MO-TC, attaching a report, statement, or K-1 note from the entity showing your share of the tax.
4. The federal benefit comes from the entity-level deduction. Under IRS Notice 2020-75, state income tax an electing pass-through pays is deductible in computing the entity's federal taxable income. That moves the deduction off your Schedule A — where the SALT cap lives — and onto the business return, where no cap applies.

The member-level credit is nonrefundable, but any excess carries forward to future years until fully used. Members still file their own Missouri returns; the election changes where the tax is paid, not whether members file.

Why It Still Matters After OBBBA Raised the SALT Cap​

Congress raised the federal SALT cap to $40,400 for 2026 (phasing out above $505,000 of modified adjusted gross income), with a reversion to $10,000 scheduled for 2030. That narrows — but does not close — the PTET window:

• If your total state and local taxes already exceed the cap, every dollar of Missouri tax shifted to the entity still saves federal tax at your marginal rate.
• If you are under the cap, the election may add paperwork without adding benefit. Run both scenarios before electing.
• High earners in the phase-out range get squeezed from both directions, which makes the uncapped entity-level deduction relatively more attractive.

Missouri adds its own wrinkle: since 2025, individuals can deduct 100% of capital gains reported for federal purposes (HB 594, signed July 2025). If a large share of your entity's income is capital gains, model the election carefully — the interplay can change the value of electing, and this is exactly the year to have your CPA run the numbers rather than assuming last year's answer still holds.

Who Can Elect — and Who Gets the Credit​

Eligible entities: partnerships and S corporations for federal purposes. That includes LLCs taxed as partnerships or S corporations. Sole proprietorships, single-member LLCs taxed as disregarded entities, and C corporations cannot elect.

Members who benefit:

• Individual resident and nonresident members claim the credit against Missouri individual income tax.
• Trust and estate members can claim the credit against fiduciary tax, per Department of Revenue guidance.
• Corporate members get a nonrefundable credit on the Missouri corporate return, carried forward until used.
• Tiered structures work: if your S corporation or partnership owns part of another electing entity, the credit flows through to indirect members too.

One important subtlety: Missouri computes the entity's tax starting from the entity's own figures — including a pro forma federal qualified business income computation using the entity's income and the single-filer thresholds — not by adding up what each member could claim individually. For most operating businesses this detail stays in the background, but high-income entities near the Section 199A thresholds should know the entity-level math can differ from the sum of the members' individual math.

Making the Election: Deadlines and Paperwork​

When to elect. The election is made on the Form MO-PTE itself, filed on or before the due date or the extended due date. Pass-through returns are due on the 15th day of the fourth month after year-end — April 15 for calendar-year entities. A federal extension automatically extends the Missouri PTET return (up to six months) if you check the extension box on the MO-PTE and attach a copy of the federal extension. No separate Missouri extension form is needed in that case.

Two timing traps:

• An extension of time to file also extends the time to pay, but interest still runs from the original due date. Miss the extended payment date and a 5% addition to tax applies.
• You can decide as late as the extended deadline — but estimated payments made during the year via Form MO-PTEAP earn no benefit if you ultimately don't elect. (Overpayments can be refunded on written request.)

The representative designation is not optional. Every electing entity must designate an Affected Business Entity Representative on Form 2827 — a natural person with sole authority to act for the entity in PTET matters, including disputes and appeals. The form can be filed before or attached to the MO-PTE, and a checkbox re-designates the same person next year. No designation on file means the election is ineffective. Your CPA can still serve separately under a power of attorney; many entities name an owner as the representative and keep the accountant in the POA role.

Signatures. The MO-PTE must be signed by every member as of the filing date, by an authorized officer, manager, or member attesting under penalty of perjury — or by the designated representative.

You still file everything else. Electing does not replace the entity's regular Missouri return: you file Form MO-PTE and Form MO-1065 or MO-1120S. Members still file their individual returns to report the income and claim the credit. Treat the MO-PTE as an add-on filing, not a substitute.

The Opt-Out: When a Member Wants No Part of It​

Since 2024 legislation (SB 1912), individual members can opt out of an electing entity's PTET computation:

• Resident members file Form MO-PTE Opt-Out.
• Nonresident members file Form MO-PTENR, which requires agreeing to file a Missouri return, pay the tax on the entity-source income, and submit to Missouri jurisdiction for collection.

Key rules: the opt-out must reach the Department by the earlier of the MO-PTE's original due date or the date the entity actually files — and if the entity files on time, it can submit members' opt-out notices as attachments. An opt-out sticks for all future years until the member revokes it. Opted-out members are carved out of the entity's tax computation entirely and get no credit; the remaining members' credit percentages are re-weighted so the full tax paid is allocated among participants.

Common opt-out scenarios: a member with no Missouri liability against which to use a nonrefundable credit, a member who prefers to manage their own SALT-cap position, or a nonresident who would rather file independently.

Nonresidents, Withholding, and Composite Returns​

Missouri's composite-return system for nonresident partners and shareholders still exists alongside the PTET regime — the 2025 partnership return retains its composite-return checkbox, and nonresident withholding rules are unchanged. The PTET election and the composite return are separate tools that solve different problems: the PTET shifts tax to the entity for the federal deduction benefit, while composite filing is a convenience that lets qualifying nonresidents satisfy Missouri filing obligations through the entity.

If your entity has nonresident members, coordinate the two decisions rather than assuming one answers the other. Nonresident members of an electing entity receive the PTE credit to use on their Missouri returns, and any nonresident who would rather stay out of the computation has the MO-PTENR opt-out path described above.

What Didn't Change in 2026​

A cleanup bill, HB 3405, would have rewritten parts of the SALT Parity Act starting in 2027 — converting member relief from a credit to an income subtraction and simplifying the entity-level calculation. It passed the Missouri House unanimously on April 30, 2026, but stalled in the Senate and never became law. For 2026, the credit-based system described above remains the law. If a similar bill resurfaces, expect the member-benefit mechanics to be the part that changes.

Mistakes That Cost Real Money​

1. Forgetting Form 2827. Without a designated representative, the whole election fails. Attach it or file it before the return.
2. Assuming MO-PTE replaces the MO-1065/MO-1120S. It doesn't — file both, or face notices on the missing one.
3. Claiming the credit in the wrong year. Members claim the PTE credit for the tax year the entity paid the tax, which may differ from the year the income was earned when estimates and extensions are involved.
4. Letting miscellaneous credits quietly shrink the benefit. Other Missouri tax credits claimed on the MO-PTE reduce the entity's tax paid — and therefore reduce each member's PTE credit dollar for dollar. Model credit ordering before stacking incentives.
5. Amending without warning the members. An amended MO-PTE that reduces the entity's liability can reduce or eliminate every member's PTE credit. Coordinate amendments with all affected members first.
6. Mismatched K-1 percentages. The member percentages on the MO-PTE should match the K-1s. Special allocations need to be reflected consistently, or the Department will question the credit amounts.

Keep Your Entity-Level Tax Records Organized​

A PTET election adds a second tax return, quarterly estimated vouchers, per-member credit reports, opt-out tracking, and a representative designation to your compliance stack — all of which must tie back to the same K-1 figures. That is fundamentally a bookkeeping discipline problem: clean entity books make the MO-PTE, the member credit statements, and next year's estimates straightforward, while messy books turn every one of them into a reconstruction project. If you are new to ledger-based bookkeeping, the /docs/ guides walk through setting up accounts and recording transactions step by step.

Simplify Your Financial Management​

As you weigh Missouri's PTET election against the higher federal SALT cap, maintaining clear financial records is what makes the modeling — and the filing — actually work. Beancount.io provides plain-text accounting that gives you complete transparency and control over your financial data, so entity payments, member allocations, and credit carryforwards all live in one auditable ledger. Get started for free and see why developers and finance professionals are switching to plain-text accounting.