One of the most widely discussed provisions of the One Big Beautiful Bill Act (OBBBA) is the dramatic expansion of the state and local tax (SALT) deduction cap. After years of the $10,000 limit imposed by the 2017 Tax Cuts and Jobs Act, the OBBBA raised the cap to $40,000 for 2026. For homeowners in high-tax states like California, New York, New Jersey, and Illinois, this reshapes the standard vs. itemizing decision for the first time in years.
What Changed: $10,000 → $40,000
Before the OBBBA, the SALT deduction was capped at $10,000 per return regardless of filing status. A homeowner in New Jersey paying $12,000 in property taxes alone blew through the cap without even counting state income tax. Under the OBBBA, the cap increases to $40,000 for 2026 for most filers — a fourfold increase that allows taxpayers to deduct up to $40,000 in combined state income taxes and property taxes.
Who Benefits Most?
The SALT expansion is most valuable for taxpayers who:
- Live in high state income tax states (California: up to 13.3%, New York: up to 10.9%, New Jersey: up to 10.75%)
- Own high-value real estate with significant property tax bills
- Have total SALT exceeding $10,000 — previously capped but now fully or largely deductible
- Have enough other itemized deductions to exceed the standard deduction
For example: a married couple in California earning $200,000 might pay $15,000 in state income tax and $8,000 in property taxes — a combined $23,000 in SALT. Under the old cap, they could only deduct $10,000. Under the $40,000 cap, they deduct the full $23,000.
The Income Phase-Out
The $40,000 cap phases out for higher-income taxpayers, reducing the available SALT deduction once MAGI exceeds certain thresholds, with the cap reducing proportionally until it reaches the old $10,000 floor for very high earners. General guidance: taxpayers with MAGI below approximately $500,000 are most likely to benefit from the full or partial increase. Very high earners above $600,000–$700,000 may see the cap reduced back toward prior levels. Consult IRS guidance or a tax professional for exact phase-out parameters.
Does Itemizing Now Beat the Standard Deduction for You?
The 2026 standard deduction is approximately $15,750 for single filers and $31,500 for married filing jointly. Your key itemized deductions to add up:
- SALT: State income tax withheld + property taxes paid (up to $40,000 cap)
- Mortgage interest: Interest on loans up to $750,000 of acquisition debt
- Charitable contributions: Cash donations to qualifying organizations
- Medical expenses: Qualifying expenses exceeding 7.5% of AGI
Example: Married Couple in New York
- State income tax paid: $16,000
- Property taxes: $9,000
- Total SALT: $25,000 (under the $40,000 cap — fully deductible)
- Mortgage interest: $14,000
- Charitable giving: $3,000
- Total itemized deductions: $42,000 vs. $31,500 standard deduction
- Benefit of itemizing: $10,500 more deducted — worth ~$2,310 in tax savings at 22%
Under the old $10,000 SALT cap, this couple's total itemized deductions would have been $27,000 — barely exceeding the standard deduction and making the choice much less clear.
Example: Single Filer in Texas (No State Income Tax)
- State income tax: $0
- Property taxes: $6,500
- Mortgage interest: $9,000
- Charitable giving: $1,000
- Total itemized deductions: $16,500 vs. $15,750 standard deduction
- Benefit of itemizing: $750 — worth ~$165 at 22%
This filer could technically itemize but the margin is thin enough that the standard deduction is simpler and nearly equivalent. The SALT expansion doesn't move the needle as much for no-income-tax state residents since their SALT is already limited to property taxes.
How to Update Your Withholding
If the SALT expansion means you'll itemize in 2026 where you previously took the standard deduction, your current withholding may be too high. Submit a new W-4 to your employer to reduce withholding and bring more money home each paycheck rather than waiting for a large refund. Use our federal income tax calculator with itemized deductions factored in to estimate your 2026 liability, then compare to your year-to-date withholding.
State Conformity
The SALT deduction is a federal deduction only — it reduces your federal taxable income, not your state taxable income. The OBBBA's SALT expansion has no direct effect on what you owe in state income tax. See our state income tax pages for state-specific deduction rules.
The Bottom Line
The SALT cap expansion from $10,000 to $40,000 is the most impactful OBBBA change for high-tax-state homeowners. If you own a home and pay significant state income tax, run the numbers now — the standard vs. itemize decision may have flipped in 2026. See our standard deduction vs. itemizing guide for the full framework.
SALT, Mortgage Interest, and the Itemizing Decision in 2026
The expanded SALT cap changes the itemizing math for many homeowners in high-tax states. Here is how to run the comparison quickly. Add your projected 2026 SALT (state income tax withheld year-to-date plus expected property tax payment, capped at $40,000) to your mortgage interest (from your lender's Form 1098) and charitable contributions. If the total exceeds your standard deduction ($16,100 single / $32,200 married), itemizing saves you more. If not, take the standard deduction.
For homeowners near the threshold, two strategies can tip the balance. First, prepay January's mortgage payment in December if your lender allows it -- the extra interest counts for 2026. Second, consider bunching charitable contributions into 2026 if you are on the fence, then taking the standard deduction in 2027 and donating less that year. The net giving is the same over two years, but one year you itemize meaningfully and the other you take the full standard deduction, rather than splitting contributions evenly and potentially benefiting from neither.
SALT and the Alternative Minimum Tax
The Alternative Minimum Tax (AMT) does not allow a deduction for state and local taxes at all -- the SALT deduction is completely disallowed under the AMT system. If you are subject to the AMT, the expanded SALT cap provides no additional benefit. The AMT exemption for 2026 is $90,100 for single filers and $140,200 for married filers, with phase-out beginning at $635,900 and $1,271,900 respectively. Most middle-income taxpayers are not affected by the AMT, but high earners who exercise incentive stock options or have other preference items should run an AMT check before assuming the expanded SALT cap benefits them.
Pass-Through Entity SALT Workaround
Many states have enacted Pass-Through Entity (PTE) tax elections that allow partnerships, S-corporations, and multi-member LLCs to pay state income taxes at the entity level. Since the individual SALT cap applies to personal deductions, entity-level payments are deductible as business expenses without being subject to the personal SALT cap. Self-employed business owners and partners with high state income tax liability should evaluate whether the PTE election still makes sense now that the individual cap has risen to $40,000. For those with state tax liability under $40,000, the personal deduction now covers the full amount, reducing the appeal of the PTE election. Those with state tax liability approaching or exceeding $40,000 may still benefit from the entity-level approach.