11/25/2025
The Senate just passed the most significant SALT deduction changes since 2017.
While everyone's celebrating the increase from $10,000 to $40,000, there's a hidden tax trap that creates effective marginal rates exceeding 45% --
Consider a couple earning exactly $500,000 with typical itemized deductions totaling $70,000 (including the full $40,000 SALT deduction). Their taxable income would be $430,000, placing them in the 32% marginal tax bracket.
Scenario B: Income Above the Threshold
Now consider a similar couple earning $600,000 with identical deduction patterns. The phaseout mechanism reduces their SALT deduction by $30,000 (calculated as 30% × ($600,000 - $500,000) =
$30,000). This reduction drops their SALT deduction from $40,000 to $10,000, leaving them with only $40,000 in total itemized deductions. Their taxable income becomes $560,000, pushing them into the 35% bracket.
The Mathematics of the Tax Trap The couple in Scenario B earned $100,000 more in gross income than those in Scenario A, but their
taxable income increased by $130,000 ($560,000 - $430,000). This means they face federal income tax on 130% of their additional earnings, creating an effective marginal rate of 45.5% (35% × 130%) before state income taxes, which can push the combined rate well above 50%
If you earn over $500,000.00 do some tax planning now.