For seven years, the $10,000 cap on state and local tax deductions — known as the SALT cap — was one of the most resented lines in the entire tax code. Introduced by the 2017 Tax Cuts and Jobs Act, it quietly raised the real tax bill of millions of homeowners and business owners in higher-tax states, who suddenly could no longer deduct the full weight of their property and income taxes. In many households, a $30,000 or $40,000 stack of state and local taxes shrank to a $10,000 deduction overnight.
The One Big Beautiful Bill Act (OBBBA) changed that. Beginning in 2026, the SALT cap quadruples to $40,000 — a shift that will meaningfully lower federal tax bills for a large slice of upper-middle-income filers. But the new cap comes with an income phase-out and a built-in expiration, so capturing the full benefit takes planning, not just paperwork. Here is exactly how the new rule works and who stands to gain the most.
What the SALT Deduction Actually Is
If you itemize deductions, the SALT deduction lets you subtract certain state and local taxes from your federal taxable income. It covers two main buckets:
- State and local income taxes (or, alternatively, state and local sales taxes — you choose one).
- Property taxes on your home and other real estate.
Add those together, and under the old rule you could deduct only the first $10,000 — no matter how large the actual bill. For a family in a state with high property values and an income tax, that ceiling was easy to blow past on property taxes alone.
The Three Things That Changed in 2026
The OBBBA rewrote the SALT rules in three important ways. Understanding all three matters, because the headline number is not the whole story.
1. The Cap Jumps to $40,000
The core change is simple: the deduction ceiling rises from $10,000 to $40,000 for 2026. For a household that pays $28,000 in combined state income and property taxes, the deductible amount goes from $10,000 to the full $28,000 — an extra $18,000 of deductions that directly lowers taxable income. The cap is scheduled to grow by 1% per year through 2029.
2. There Is Now an Income Phase-Out
The larger cap is not available to everyone. For filers with modified adjusted gross income above roughly $500,000, the $40,000 cap begins to phase down — reduced by 30% of income over the threshold — until it floors back at the old $10,000 for the highest earners. In other words, the biggest winners are households in the upper-middle bracket, not the very top.
SALT Cap at a Glance (2026)
- New cap: $40,000 (up from $10,000).
- Annual growth: +1% per year through 2029.
- Phase-out begins: around $500,000 modified AGI.
- Phase-out floor: back to $10,000 for the highest earners.
- Scheduled to revert to $10,000 after 2029 unless extended.
3. The Marriage Penalty Persists
Here is a detail that surprises many couples: the $40,000 cap is the same for single filers and married couples filing jointly. Two single people can each claim up to $40,000, but a married couple shares a single $40,000 ceiling. For dual-income households in high-tax areas, that quirk is worth modeling carefully with a tax preparation and strategy professional.
The SALT cap increase is one of the few 2026 changes that puts real money back in the pockets of ordinary homeowners — but only those who itemize, and only up to the income line. Knowing which side of that line you fall on is the difference between a bigger refund and a missed opportunity.
Old Rule vs. New Rule
| Feature | 2018–2025 | 2026 |
|---|---|---|
| Deduction cap | $10,000 | $40,000 (+1%/yr) |
| Income phase-out | None | Begins ~$500,000 MAGI |
| Married vs. single | Same $10,000 either way | Same $40,000 either way |
| Must itemize? | Yes | Yes |
Who Benefits Most?
The bigger cap reshapes the itemize-vs.-standard-deduction math for a specific group of taxpayers. You are most likely to come out ahead if you:
- Own a home in a high-tax area. Sizable property taxes plus a state income tax are the fastest way to fill up the new $40,000 room.
- Have income under the phase-out. Households between roughly $200,000 and $500,000 in income tend to capture the full benefit.
- Already itemize — or now will. The larger SALT deduction can push your total itemized deductions above the standard deduction for the first time, unlocking write-offs you previously lost.
If you are unsure whether itemizing now beats the standard deduction, that is exactly the kind of comparison to run before year-end — and it pairs naturally with a review of your quarterly estimated tax payments so you are not over- or under-withholding along the way.
Business Owners: The SALT Cap and the PTET Workaround
For owners of pass-through businesses — S corporations, partnerships, and many LLCs — the picture is more nuanced. Many states allow a Pass-Through Entity Tax (PTET) election that lets the business pay state tax at the entity level and deduct it in full, sidestepping the individual SALT cap entirely. With the individual cap now at $40,000, the question becomes: is the PTET election still worth it, or does the higher personal cap make it unnecessary?
The answer depends on your income, your state, and how much state tax flows through your return. For many owners, combining a PTET election with the new $40,000 personal cap produces the best result — but it has to be modeled, not assumed. We break down the mechanics in our guide to the PTET SALT cap workaround, and our CFO and advisory team runs these projections for owners every year.
How to Plan for It Now
Because the cap is temporary and income-sensitive, a few proactive moves can help you lock in the benefit:
- Project your income against the phase-out. If you are near the $500,000 line, timing a bonus, a Roth conversion, or a capital gain into a different year could preserve thousands in deductions.
- Bunch deductible taxes strategically. Prepaying certain property taxes or timing state estimated payments can help you fill the $40,000 room in the years it counts most.
- Keep clean records. Full deductions require documentation of every property tax and state payment — the kind of detail solid bookkeeping and accounting and coordinated financial planning make effortless.
- Watch the 2029 sunset. Unless Congress acts, the cap reverts to $10,000 after 2029. Multi-year planning should assume the window is finite.
The Bottom Line
The jump from a $10,000 to a $40,000 SALT cap is one of the most broadly felt tax changes of 2026 — a genuine break for homeowners and business owners who have spent years watching their state and local taxes go partly undeducted. But the benefit narrows as income rises, disappears above the phase-out, and expires at the end of the decade. The taxpayers who gain the most will be the ones who plan around those edges rather than discovering them at filing time.
Not sure how the new SALT cap changes your itemizing decision, or whether a PTET election still makes sense for your business? Schedule a free consultation and our tax strategy team will model your specific numbers — personal and business — so you capture every dollar the new $40,000 cap allows.
