Hidden Tax Change Reduces Deduction Benefits for High-Income Filers

The One Big Beautiful Bill Act added a new Section 68(a) provision that reduces itemized deductions by 2/37 of qualifying amounts for high-income taxpayers in the 37 percent bracket, effectively cutting the tax benefit from 37 cents to approximately 35 cents per deductible dollar. A married couple earning $1 million with $100,000 in itemized deductions loses roughly $5,405 of those deductions, adding approximately $2,000 to their federal tax bill. Taxpayers can preserve full deduction benefits by using qualified charitable distributions from IRAs and pre-tax 401(k) contributions, which escape the Section 68(a) limitation entirely.

The One Big Beautiful Bill Act, signed in July 2025, fundamentally altered how the federal tax system treats write-offs for wealthy Americans. Rather than eliminating restrictions on deductions outright, lawmakers replaced the previous Pease limitation with a new formula that specifically targets the highest earners. The change applies a mathematical reduction based on how far a filer's income exceeds the threshold where the 37 percent tax bracket begins, creating a sliding scale of impact.

Notably, the provision does not affect all high earners equally. Those whose income barely surpasses the trigger point face significantly smaller reductions than those substantially higher up the income scale. For example, a couple earning $700,000 with $100,000 in deductions loses roughly $592 in tax benefits, while a couple earning $1 million faces a $2,000 hit—demonstrating how the limitation compounds at higher income levels.