August 22, 2025
The One Big Beautiful Bill Act (OBBBA) shifts the landscape for federal income tax deductions for state and local taxes (SALT), albeit temporarily. If you have high SALT expenses, the changes could significantly reduce your federal income tax liability. But it requires careful planning to maximize the benefits — and avoid potential traps that could increase your effective tax rate. A little background Less than a decade ago, eligible SALT expenses were generally 100% deductible on federal income tax returns if an individual itemized deductions. This provided substantial tax savings to many taxpayers in locations with higher income or property tax rates (or higher home values). Beginning in 2018, the Tax Cuts and Jobs Act (TCJA) put a $10,000 limit on the deduction ($5,000 for married couples filing separately). This SALT cap was scheduled to expire after 2025. What’s new? Rather than letting the $10,000 cap expire or immediately making it permanent, Congress included a provision in the OBBBA that temporarily quadruples the limit. Beginning in 2025, taxpayers can deduct up to $40,000 ($20,000 for separate filers), with 1% increases each subsequent year. Then in 2030, the OBBBA reinstates the $10,000 cap. While the higher limit is in place, it’s reduced for taxpayers with incomes above a certain level. The allowable deduction drops by 30% of the amount by which modified adjusted gross income (MAGI) exceeds a threshold amount. For 2025, the threshold is $500,000; when MAGI reaches $600,000, the previous $10,000 cap applies. (These amounts are halved for separate filers.) The MAGI threshold will also increase 1% each year through 2029. Deductible SALT expenses include property taxes (for homes, vehicles and boats) and either income tax or sales tax, but not both. If you live in a state without income taxes or opt for the sales tax route for another reason, you don’t have to save all your receipts for the year and manually calculate your sales tax; you can use the IRS Sales Tax Deduction Calculator to determine the amount of sales tax you can claim. (It includes the ability to add actual sales tax paid on certain big-ticket items, such as a vehicle.) The increased SALT cap could lead to major tax savings compared with the $10,000 cap. For example, a single taxpayer in the 35% tax bracket with $40,000 in SALT expenses and MAGI below the threshold amount would save an additional $10,500 [35% × ($40,000 − $10,000)]. The calculation would be different if the taxpayer’s MAGI exceeded the threshold. Let’s say MAGI is $560,000, which is $60,000 over the 2025 threshold. The cap would be reduced by $18,000 (30% × $60,000), leaving a maximum SALT deduction of $22,000 ($40,000 − $18,000). Even reduced, that’s more than twice what would be permitted under the $10,000 cap. The itemization decision The SALT deduction is available only to taxpayers who itemize their deductions. The TCJA nearly doubled the standard deduction. As a result of that change and the $10,000 SALT cap, the number of taxpayers who itemize dropped substantially. And, under the OBBBA, the standard deduction is even higher — for 2025, it’s $15,750 for single and separate filers, $23,625 for heads of household filers, and $31,500 for joint filers. But the higher SALT cap might make it worthwhile for some taxpayers who’ve been claiming the standard deduction post-TCJA to start itemizing again. Consider, for example, a taxpayer who pays high state income tax. If that amount combined with other itemized deductions (generally, certain medical and dental expenses, home mortgage interest, qualified casualty and theft losses, and charitable contributions) exceeds the applicable standard deduction, the taxpayer will save more tax by itemizing. Beware the “SALT torpedo” Taxpayers whose MAGI falls between $500,000 and $600,000 and who have large SALT expenses should be aware of what some are calling the “SALT torpedo.” As your income climbs into this range, you don’t just add income. You also lose part of the SALT deduction, increasing your taxable income further. Let’s say your MAGI is $600,000, you have $40,000 in SALT expenses and you have $35,000 in other itemized deductions. The $100,000 increase in income from $500,000 actually raises your taxable income by $130,000: