Case Studies
Case Study: How the New SALT Deduction Limit Could Impact High-Tax State Residents
An in-depth look at how the temporary increase of the SALT cap under OBBBA affects taxpayers in states like New York and California, including phase-outs and income thresholds.
By NomadicTax Research Team • 5-8 min read • April 17, 2026
## Background: What Has Changed for SALT?
The _One, Big, Beautiful Bill Act_ temporarily raises the cap on the federal **state and local tax (SALT) deduction** from $10,000 (TCJA’s standard) to **$40,000** for tax years **2025 through 2029**, with adjustments for inflation. After 2029, the cap reverts back to $10,000. ([cov.com](https://www.cov.com/news-and-insights/insights/2025/07/key-provisions-of-the-one-big-beautiful-bill-act?utm_source=openai))
The benefit phases down for taxpayers with **modified adjusted gross income (MAGI)** over **$500,000**—at a rate of 30% of the excess MAGI. The deduction never drops below $10,000, even for high MAGI. ([cov.com](https://www.cov.com/news-and-insights/insights/2025/07/key-provisions-of-the-one-big-beautiful-bill-act?utm_source=openai))
## Scenario: New York Resident With High State Tax Payments
- **Individual** filing jointly, resident of New York, with a MAGI of $550,000.
- State and local taxes paid: $50,000 in state income tax and $35,000 in property tax, totaling $85,000.
Under old rules (cap at $10,000), the taxpayer could deduct only $10,000 of SALT. Under **OBBBA’s new temporary cap**, the deduction limit is $40,000—But, because MAGI exceeds $500,000, there's a phase-down:
Phase-down amount = 30% × (MAGI − $500,000) = 30% × $50,000 = $15,000
Adjusted cap = $40,000 − $15,000 = **$25,000**
So, instead of being limited to a $10,000 deduction, this taxpayer may deduct **$25,000** in SALT for 2025 (or for tax year 2025 returns filed in 2026), assuming no other restrictions. That’s a $15,000 increase in potential deduction.
## Practical Takeaways
- **Check your taxable year's income**: MAGI threshold is $500,000; every dollar above it reduces your benefit.
- **Timing matters**: The raised cap applies for 2025-2029; consider whether shifting deductions (property tax payments or state prepayments) can take advantage of these years.
- **Bundle deductions if possible**: If making large property tax or state income payments, timing them in fall 2025 or 2026 could maximize deductions before returning to the lower cap in 2030.
## What To Watch Out For
- Calculate whether **your income level will phase you out significantly**; those with MAGI much above $500,000 may have only modest gains.
- Beware of keeping precise records—property tax, state tax, local tax receipts—that support deduction claims.
- Monitor **inflation adjustments**: Cap (e.g. the $40,000) will increase slightly each year through 2029.
## Takeaway Summary
*For high-tax state residents with moderate to high income, the SALT deduction cap increase under OBBBA offers meaningful relief—but only if you plan ahead for phase-outs and make sure your itemized deductions are large enough to benefit.*