Pass-Through Entity Tax Election: When the State Workaround Saves Federal Tax

Federal saving from a pass-through entity tax election ≈ state income tax the entity pays × your federal marginal rate, minus the part of that state tax your personal SALT deduction would have covered anyway, minus any QBI deduction you lose. That one line explains when the election is worth doing and when it isn't.

The mechanism comes from IRS Notice 2020-75. When a partnership or S corporation pays a state income tax imposed on the entity, the entity deducts it in computing its non-separately stated income. The payment is not treated as the owner's state tax for the individual SALT limitation. The owner's K-1 income is lower by the tax paid, and the state usually gives the owner a credit or exclusion for the entity-level tax.

What changed for 2026, and what didn't

The One Big Beautiful Bill Act raised the SALT cap, which made some owners assume the workaround was obsolete. For many high-earning owners it isn't, because the higher cap phases back down.

IRS Publication 505 gives the 2026 numbers: the limit is $40,400 ($20,200 married filing separately). It is reduced when modified adjusted gross income exceeds $505,000 ($252,500 married filing separately), but not below $10,000 ($5,000 married filing separately). The statute, IRC §164(b)(7), sets the reduction at 30% of the MAGI above the threshold, and the 2025 Schedule A instructions walk through it line by line on a worksheet.

Apply that 30% to the 2026 figures and the cap falls to the $10,000 floor at about $606,333 of MAGI:

$40,400 - 0.30 x (MAGI - $505,000) = $10,000
MAGI = $505,000 + ($30,400 / 0.30) = about $606,333

An owner taking $600,000 or more of profit and salary out of a healthy service business is above that line. For that owner, the personal SALT deduction is back to $10,000, and the entity-level election matters as much as it did before the cap went up. Our earlier piece on the SALT deduction cap for business owners covers the background, and the broader OBBBA 2026 tax plan changes are in a separate guide.

Who benefits, by income band

Two more conditions: you have to itemize for the personal SALT comparison to matter, and you have to live or earn in a state that actually offers an elective entity-level tax with a credit or exclusion for owners. States differ on election deadlines, rates, estimated-payment rules, and how nonresident owners are treated. Check the specific state's rules before relying on the election.

The PTET answer depends on three numbers most owners don't see until their preparer runs them in spring: this year's MAGI, the state tax on your K-1, and your QBI position. A Leak Check on owner tax gets you rough versions of all three while there's still time to pay by December 31.

A hypothetical owner at $900,000 of K-1 income

Hypothetical figures. A married owner of a non-SSTB S corporation in a state with a 5% elective entity-level tax. K-1 income is $900,000, the owner also takes a $150,000 W-2 salary, and there is no other significant income. The company's total W-2 payroll is large enough that the QBI wage limit doesn't bind, and the couple itemizes. Property tax on the home is $12,000.

The 37% rate applies because taxable income stays above the 2026 joint threshold of $768,700 in the IRS 2026 inflation adjustments with or without the election. Drop the salary and the same owner lands in the 35% bracket, where the gross saving is $15,750. Use your own bracket, not the top one.

The QBI offset

The entity-level tax reduces the S corporation's ordinary income, and that usually reduces qualified business income too. If this owner's QBI deduction is 20% of QBI, $45,000 less QBI means $9,000 less deduction, which at 37% gives back about $3,330.

Gross federal saving                     $16,650
Less: lost QBI deduction ($9,000 x 37%)  ($3,330)
Net federal saving, illustrative          about $13,320

The real answer depends on where you sit in the QBI rules. Rev. Proc. 2025-32 puts the 2026 joint threshold at $403,500 with the phase-in ending at $553,500. A specified service business above that range gets no QBI deduction, so the election has no QBI cost at all. A non-SSTB owner above the range is subject to the wage limit, which can make the QBI effect smaller or larger. Our guide to the QBI deduction for service businesses explains the limits.

The timing rule owners miss

Notice 2020-75 allows the entity's deduction in the taxable year in which the payment is made. For a calendar-year S corporation, that means a 2026 federal deduction requires the entity-level tax to be paid by December 31, 2026, whatever the state's own due date for the return.

That makes PTET a cash-flow decision as much as a tax one. The business is prepaying the owner's state tax in the fourth quarter. If December is a heavy payroll month or the line of credit is drawn, plan the payment in the forecast, not in the last week of the year.

Where the election goes wrong

• Missing the state deadline. Many states require the election on a timely filed return or by a set date. Miss it and the year is gone.
• Double-paying. The owner keeps making personal state estimates while the entity also pays. The overpayment comes back eventually, but it ties up cash.
• Multiple owners with different situations. A partner in a no-income-tax state, or one below the SALT phase-down, may not benefit. Agree on how the entity tax is allocated before electing.
• Ignoring the salary interaction. Entity tax reduces K-1 income, not W-2 wages. Your reasonable salary and payroll withholding stay the same.
• Forgetting next year's cash cycle. Once the entity pays the owners' state tax, personal state estimates should drop. If nobody updates both payment schedules together, the business funds the tax in December and the owner funds it again in January. Put both on the same calendar.
• Skipping the QBI check. For a non-SSTB owner well below the QBI threshold, the lost deduction can eat a material share of the saving.

A four-line screen with your own numbers

Before you call your preparer, run this on a napkin:

1. Projected MAGI for 2026. If it's above about $606,333 on a joint return, your personal SALT cap is $10,000. Between $505,000 and that figure, calculate your reduced cap.
2. State income tax on your share of business income. Use your state's elective entity-level rate times your projected K-1 income.
3. Uncovered state tax. Subtract whatever room you have left under your personal cap after property tax. That's the state tax the election can move to the entity.
4. Federal value. Multiply the uncovered amount by your marginal rate, then subtract 20% of it times the same rate if you expect to take the QBI deduction.

If step 4 produces less than a few thousand dollars, the election may not be worth the added entity-level payments and filings. If it's five figures, it belongs on this year's calendar. Using the hypothetical above: $45,000 uncovered, times 37%, is $16,650, less $3,330 for QBI, about $13,320.

When to elect

Elect when your MAGI is clearly above about $606,000, your state offers the election with an owner credit, the entity can fund the payment by December 31, and the QBI offset doesn't erase the saving. Under $505,000 of MAGI, check first whether your state income and property taxes already fit under the $40,400 cap.

The PTET decision sits next to the other owner-tax moves in this series: salary, accountable-plan reimbursements, and retirement funding. All of them change K-1 income, so they have to be run together. That coordinated forecast is the core of the tax planning built into our fractional CFO services.

Run the formula at the top with this year's projected numbers: entity-level state tax, times your marginal rate, minus what the cap already covers, minus lost QBI. If the result is positive and four figures or more, talk to your preparer about the state deadline this month. If you can't fill in the inputs yet, a Leak Check is a quick way to get rough ones and decide before the December payment window closes.