For high earners in California and other high-tax states, the $40,000 SALT cap looks like real relief. The phase-out math says something different. The cap is the headline. The phase-out is the planning.
The new $40,000 SALT cap reads as straightforward relief for high earners in California, New York, and other high-tax states. The math underneath says something different. For many of the families this provision was supposedly designed to help, the phase-out — not the cap — determines the actual benefit. And the phase-out moves fast.
The One Big Beautiful Bill Act, signed in July 2025, raised the SALT (state and local tax) deduction cap from $10,000 to $40,000 starting in tax year 2025. Coverage of the provision has focused on the headline number — a 4x increase, real relief for taxpayers in high-tax states. What the headlines undersell is the phase-out and the 2030 snap-back. For California households at typical Orange County, Bay Area, or Los Angeles income levels, those two details often matter more than the cap itself.
What actually changed
For tax years 2025 through 2029, the SALT deduction cap rises from $10,000 to $40,000 (with both the cap and the MAGI thresholds increasing 1% per year — so the 2026 cap is $40,400). Married-filing-separately taxpayers see a halved $20,000 cap.
But the cap is reduced by 30% of any modified adjusted gross income (MAGI) over $500,000 ($250,000 MFS). The reduction continues until the effective cap reaches the original $10,000 floor — which happens at $600,000 of MAGI in 2025, or about $606,000 in 2026. Above that, the cap is back to $10,000.
In 2030, absent further legislation, the cap reverts to $10,000 — and the snap-back amount is not indexed for inflation. This is a 4-year window.
The phase-out in concrete terms
If you’re a California household with 2026 MAGI of:
• $450,000: Full $40,400 cap. You can deduct up to that amount of state income and property tax if you itemize.
• $500,000: Still at the full cap. The phase-out begins above $505,000 in 2026.
• $550,000: Roughly $26,900 effective cap. You’ve lost $13,500 of deduction capacity to the phase-out.
• $600,000: Roughly $11,900 effective cap. You’re nearly at the floor.
• $606,000 and above: Back to $10,000. The OBBBA increase no longer applies to you.
This is the part the headlines miss. The window where the new cap delivers $30,000+ of additional deduction capacity is narrow — roughly $400,000 to $500,000 of MAGI. Above $500,000, the benefit phases out fast. Above $606,000, it’s gone.
The “SALT torpedo”
Inside the phase-out range, the marginal effective tax rate spikes. Each additional dollar of income above the threshold isn’t just taxed at the regular marginal rate — it also reduces the SALT cap, which costs you 30 cents of deduction per dollar of income. At a 35% federal marginal bracket, the SALT phase-out adds roughly 10.5 percentage points to the effective rate on income earned in the phase-out band.
The result: for an income increase that moves a household from $500,000 to $600,000 MAGI, the effective marginal federal rate on that band can run around 45% — well above the published bracket. Tax professionals have started calling this the “SALT torpedo.” For households sitting near the threshold, an end-of-year bonus, a capital gain, a Roth conversion, or a deferred-comp distribution can move you into the torpedo unintentionally.
Why California makes this acute
California has the highest top state income tax rate in the country (13.3%) and average property tax of roughly 1.1% per year on assessed value. For a household with $400,000 of state-taxable income and a $1.5 million home, the combined annual SALT bill easily exceeds $50,000.
That makes the cap matter. The phase-out matters too: high-earning households in Orange County, the Bay Area, and other California wealth centers often sit squarely in the $500,000–$700,000 MAGI range where the phase-out is most punitive. The cap rose, the deduction window expanded, but the population of households who can actually use the full $40,400 cap is smaller than the headlines suggest.
For California households well above $606,000 of MAGI, the OBBBA SALT change is functionally a non-event. They’re still effectively capped at $10,000 — same as before.
The 2030 snap-back
Even for households the new cap does help, the timeline is short. The expanded cap applies for tax years 2025 through 2029. In 2030, the cap reverts to $10,000 — and unlike the OBBBA cap, the $10,000 snap-back isn’t indexed for inflation.
For households planning multi-year income strategies — sequencing Roth conversions, planning business sales, structuring deferred compensation, exercising stock options — the 2030 snap-back is a material input. Deduction capacity available in 2025–2029 is not deduction capacity available in 2030 and beyond.
What to consider
The interactions between SALT, MAGI, and other tax provisions create several practical planning levers:
Income timing. If your MAGI puts you near the phase-out threshold, accelerating or deferring income across years can affect how much of the cap you preserve. A year that crosses from $480,000 to $530,000 MAGI loses around $7,500 of deduction capacity, and the marginal rate on that band spikes. Coordinating capital gains, bonus timing, retirement-plan distributions, and Roth conversions against the phase-out threshold matters.
Pass-through entity (PTE) tax election. California, like most high-tax states, lets pass-through entities (S-corps, partnerships, LLCs taxed as partnerships) elect to pay state income tax at the entity level. The entity-level tax is deductible as a business expense — not subject to the SALT cap. The PTE election was a TCJA-era workaround that OBBBA didn’t change. For California business owners with substantial pass-through income, the PTE election often delivers more SALT relief than the $40,400 direct cap. Owners who previously elected PTE because of the $10,000 cap should revisit the question — for some, the higher direct cap is now sufficient and the PTE election adds compliance burden without much benefit. For others, especially those above the phase-out, PTE remains the better path.
Roth conversion coordination. A Roth conversion raises MAGI in the conversion year. For households near the SALT phase-out threshold, a conversion can push you into or through the phase-out band — losing SALT deduction at the same time you incur conversion tax. The bracket math on a Roth conversion (covered in an earlier post in this series) doesn’t capture the SALT phase-out interaction. Both need to be modeled together.
AMT exposure. SALT is not deductible under the alternative minimum tax. OBBBA made TCJA’s higher AMT exemptions permanent but tightened the AMT phase-out for joint filers starting in 2026. Households with substantial SALT and high MAGI should run AMT projections — a larger SALT deduction in the regular system can simply transfer to AMT exposure, partially or fully neutralizing the benefit.
Residency considerations. For households with flexibility on state residency, the math on a move to a no-state-income-tax state changes when the SALT cap snaps back in 2030. A move that’s modestly attractive at the current cap level may become significantly more attractive when the cap drops back to $10,000.
The pattern
SALT, like most provisions in OBBBA, is a headline number that hides the actual planning issue underneath. The cap is one input. The phase-out, the MAGI thresholds, the PTE election, the AMT interaction, the residency timeline, and the snap-back all interact.
The household that reads the $40,000 headline and assumes it applies often discovers, when the return is filed, that the actual deduction is much smaller. The households that get the most benefit are the ones modeling the phase-out in advance — both within a single year, and across the 4-year window before snap-back.
The cap is the headline. The phase-out is the planning.
The plan is the residue. The planning is the work.
Key takeaways
• OBBBA raised the SALT cap from $10,000 to $40,000 for tax years 2025–2029 (rising 1% per year — $40,400 in 2026), but it phases out for MAGI above $500,000 ($250,000 MFS).
• The cap is reduced by 30% of MAGI excess over the threshold, with a floor of $10,000. Full phase-out occurs at $600,000 of MAGI in 2025 (about $606,000 in 2026).
• The phase-out creates a “SALT torpedo” — an effective marginal federal rate of around 45% on income earned in the $500K–$600K band, well above the published bracket.
• For California households above the full phase-out, the OBBBA SALT change is effectively a non-event. They remain capped at $10,000.
• The cap reverts to $10,000 in 2030 with no inflation indexing on the snap-back. The expanded cap is a 4-year window with multi-year planning implications.
• For California business owners with pass-through income, the PTE tax election often delivers more SALT relief than the direct cap and remains available under OBBBA.
Common questions about the SALT cap
What is the SALT cap in 2026?
The state and local tax (SALT) deduction cap is $40,400 for tax year 2026, rising 1% per year through 2029. The cap allows taxpayers who itemize to deduct up to that amount of combined state income tax, state and local property tax, and state and local sales tax. The cap reverts to $10,000 in 2030 absent further legislation.
Who qualifies for the new $40,000 SALT cap?
Taxpayers who itemize their deductions and have modified adjusted gross income (MAGI) below $505,000 in 2026 receive the full cap. For MAGI between $505,000 and approximately $606,000, the cap phases out. Above $606,000 of MAGI, the cap returns to the $10,000 floor.
What is the SALT cap phase-out?
For MAGI above $500,000 (rising 1% per year), the SALT cap is reduced by 30% of the excess MAGI over the threshold. The cap cannot fall below $10,000. The phase-out fully eliminates the OBBBA increase at $600,000 of MAGI in 2025 (about $606,000 in 2026), at which point the effective cap is back to the original $10,000 limit.
What is the “SALT torpedo”?
The “SALT torpedo” is the effective marginal tax rate spike that occurs for income earned within the phase-out band (roughly $500,000 to $600,000 of MAGI). Each additional dollar of income above the threshold reduces SALT deduction capacity by 30 cents. Combined with the regular marginal tax rate, this can push the effective marginal rate above 45% inside the phase-out band — creating strong incentives to manage MAGI carefully around the threshold.
Will the SALT cap return to $10,000?
Yes, absent further legislation. The expanded cap applies for tax years 2025 through 2029. In 2030, the cap reverts to $10,000 — and the snap-back amount is not indexed for inflation. The 4-year window matters for multi-year planning strategies like Roth conversions, charitable bunching, and equity-compensation exercises.
How does the SALT cap affect California taxpayers specifically?
California has the highest top state income tax rate in the country (13.3%) and significant property taxes, so most California high earners have combined SALT bills well above the cap. However, many California wealth-center households (Orange County, the Bay Area, parts of Los Angeles) have MAGI in or above the phase-out range, meaning the OBBBA increase delivers only partial benefit or no benefit at all. For California business owners with pass-through income, the pass-through entity (PTE) tax election often delivers more SALT relief than the direct cap and remains available.
This article is for informational and educational purposes only and is not intended as tax, legal, or financial planning advice. SALT cap provisions and phase-out calculations depend on individual facts including filing status, modified adjusted gross income, itemization vs. standard deduction, and state of residence. Consult your CPA and tax advisor about how the OBBBA SALT provisions apply to your specific situation.
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