SALT Cap $40,000 for 2025: Why PTET Elections Still Matter for Multistate Owners

The ceiling is $40,000. The IRS states it plainly: "Individuals who itemize their deductions can claim up to $40,000 ($20,000 if married filing separately) for state and local taxes paid."^[1] The same page records the ceiling it replaced: "This limit was increased from $10,000 ($5,000 if married filing separately)."^[3]

Two details get lost in the headline number. First, this is a limit on an itemized deduction, listed by the IRS among the year's changes as "An increase in the limitation on the itemized deduction for state and local taxes paid"^[4], so a household that takes the standard deduction gets nothing from the increase. Second, the larger figure is not permanent. The statute steps the limit up only modestly in the years after 2025 and then restores the prior $10,000 ceiling^[3], so a multiyear plan should treat this window as temporary.

Higher earners do. The IRS puts it this way: "The maximum deduction is reduced for taxpayers with modified adjusted gross income over $500,000 ($250,000 if married filing separately)."^[2]

The test is modified adjusted gross income, not taxable income, and for a partner or an S corporation shareholder that number is driven by the K-1 far more than by a paycheck. A strong year inside the entity can push a household past the threshold with no change at all to salary or distributions. The reduction is also a taper rather than a cliff: the allowance shrinks as income climbs past the threshold and stops falling at the pre-2025 limit of $10,000 ($5,000 if married filing separately)^[3], so a high earner still deducts something, just far less than the headline amount. Because the threshold applies per return, two owners in one household can cross it on combined income even when neither business had an unusual year, so the phase-down is worth modeling before the year closes.

Yes, and that single condition decides whether the increase is worth anything to you. The cap only matters if your itemized deductions beat the standard deduction, and the standard deduction rose in the same law: "$31,500 (up from $30,000) for married filing jointly or a qualifying surviving spouse"^[5], with $23,625 for head of household and $15,750 for single or married filing separately^[5].

So a joint filer has to assemble state, local, property, mortgage interest, and charitable deductions past that bar before the extra SALT room produces a single dollar of benefit. That is a sharp contrast with several other deductions the same package created, which the IRS describes as available to "both itemizing and non-itemizing taxpayers."^[8] The SALT limit got no such treatment, so the first step for most Florida households is a side-by-side comparison, not an assumption that a bigger cap means a bigger refund.

It does, in two ways that have nothing to do with a Florida income tax bill. Florida imposes no personal income tax, so a Florida-only filer's state and local taxes are essentially property taxes, and for most households those alone do not approach $40,000^[1]. The increase lands much more quietly here than in a state that taxes wages and business income.

The second way is what moves real money for owners. Miami partners and S corporation shareholders routinely hold interests in entities that operate, employ people, or hold property in states that do tax income. That income is taxed at the source, the owner files a nonresident return there, and the resulting state tax lands on the personal federal return, where the cap constrains it. Investors holding out-of-state rental property through partnerships meet the same pattern, which is why out-of-state filing questions and real estate + property management tax help tend to come up in the same conversation. The footprint tests that create the sales tax duties described in Florida economic nexus for remote sellers frequently reveal income tax filing duties in the same states.

A pass-through entity tax election lets a partnership or an S corporation pay a state's income tax at the entity level instead of pushing the entire burden onto the owners' personal returns. The entity deducts that payment against its own income, so the income reported on each K-1 is already lower, and the owner generally receives a state credit or an exclusion for the tax the entity paid.

The federal footing is the guidance the IRS indexes as "Notice 2020-75, Forthcoming Regulations Regarding the Deductibility of Payments by Partnerships and S Corporations for Certain State and Local Income Taxes"^[9]. What that notice does not do is standardize the states. Election mechanics differ everywhere: some elections are annual and irrevocable, some require consent from every owner, some require estimated payments during the year before the deduction is respected, and some exclude certain owner types from the benefit. Because the election is made on the entity return, it belongs with the business tax return preparation file rather than the personal one, and a missed election window usually cannot be reopened after the year ends.

Because the entity-level deduction is not touched by the personal ceiling. The $40,000 limit^[1] and its reduction above $500,000 of modified adjusted gross income^[2] govern an itemized deduction on the individual return. State income tax that the entity pays and deducts never enters that computation at all.

Three fact patterns make the election worth running numbers on for tax year 2025. Owners above the phase-down threshold keep the smallest share of the higher personal cap, so moving tax to the entity level preserves a deduction they would otherwise lose. Owners who take the standard deduction get no personal SALT benefit whatsoever, while the entity-level deduction still reduces the income their K-1 reports. And owners paying tax to more than one state exhaust the personal $40,000 quickly, because the cap is one household number rather than a per-state allowance. Running that comparison is a tax planning exercise that has to happen before the entity return is filed, since the election and the payment both have deadlines that the personal return cannot cure.

Notice 2020-75 is the one that matters, and its neighbors in the IRS guidance index tell you why owners should be careful with anything that looks like a shortcut. The same index lists an earlier approach the agency moved against: "Notice 2018-54, Guidance on Certain Payments Made in Exchange for State and Local Tax Credits"^[10], aimed at state programs that recharacterized a state tax payment as a charitable contribution. Those designs did not survive.

The entity-level route was treated differently. The notice describes forthcoming regulations on "the Deductibility of Payments by Partnerships and S Corporations for Certain State and Local Income Taxes"^[9], and the states built their regimes on that footing. Two practical consequences follow for an owner. The deduction lives on the entity return, so it is only as reliable as the entity's books and the date the payment actually clears. And the regulations the notice announced were still described as forthcoming when it was issued in 2020, so the operating detail keeps coming from each state rather than from one federal rulebook.

It can, and the IRS points the review at the start of the following year: "If you update your withholding for the remainder of 2025, you are encouraged to recheck and update your withholding at the beginning of 2026."^[6]

For an owner who is not on a payroll, the equivalent lever is the quarterly estimate rather than a withholding form. A larger itemized deduction lowers the federal liability the estimates are sized against, and an entity-level state tax payment changes the arithmetic again by reducing the income the K-1 reports. Adjusting one without the other is how owners collect an underpayment penalty in a year when their total tax actually fell. Reworking the estimate calendar alongside the individual tax return preparation file keeps both numbers moving in the same direction.

The SALT increase arrived inside a much larger package, and even its name has shifted. The IRS now publishes the guidance under the label "Working Families Tax Cuts", describing provisions "signed into law on July 4, 2025, as Public Law 119-21, that go into effect for 2025."^[7] Readers who searched for the One Big Beautiful Bill Act are looking at the same statute under a different banner.

That breadth matters for planning. Several of the package's new deductions are available to "both itemizing and non-itemizing taxpayers"^[8] while the SALT limit is not, so a household can easily end up better off taking the standard deduction plus those deductions than itemizing to reach the larger cap. The business provisions in the same law also move entity-level taxable income, which changes the K-1 the SALT and PTET analysis depends on; those are covered in the One Big Beautiful Bill tax guide. Partners in multistate consulting, engineering, and agency firms feel all three effects at once, which is the usual starting point for professional services tax help.