The $40,400 SALT Cap Came With a Hidden 5.4% Haircut
Congress gave you a bigger SALT deduction. Then it shaved 5.4% off the top. Of everything.
The Gift
The One Big Beautiful Bill Act, signed July 4, 2025, raised the SALT cap from $10,000 to $40,400. Big win. Headlines everywhere. Your state and local tax deduction just roughly quadrupled.
That was the part they wanted you to see.
The Fraction
Buried in the same bill is a rewrite of IRC Section 68. Starting in 2026, every dollar of itemized deductions you claim gets reduced by a fraction. Two thirty-sevenths. That's 5.4 cents on every dollar.
Think of it as a toll booth at the end of a highway. You drove the whole road. You collected your deductions. You pulled up to file. And a booth you never saw takes a nickel off every dollar before you pass through.
If you sit in the 37% bracket, each dollar of deductions used to save you 37 cents in tax. Now it saves you 35 cents. The two-cent gap is the haircut. Per dollar. On everything.
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The Grinder
Here's where it turns. The 2/37 rule doesn't just hit SALT. It hits every itemized deduction in one bucket. SALT. Mortgage interest. Charitable gifts. All of them feed the same grinder.
Old tax law had a similar rule called the Pease limitation. Pease left medical expenses alone. It left investment interest alone. It left casualty losses alone. The new rule does not carve any of those out. Everything goes in.
So the bigger your pile of deductions, the bigger the shave.
The Math
Schwab ran the numbers. A married couple in the 37% bracket with $100,000 in total itemized deductions expects to save $37,000 in taxes. They save $35,000.
Two thousand dollars vanished.
Not into a fund. Not into a program. Into a fraction nobody mentioned on signing day.
And that $40,400 SALT cap you just got? Frazier & Deeter calculated that after the 2/37 rule runs, your $40,400 deduction drops to an effective $38,216. The gift shrank before you opened it.
One more thing. The rule applies after all other floors and phaseouts have already reduced your deductions. Every other limit takes its cut first. Then the 2/37 rule walks in last. Last toll booth. No sign. No warning.
The Invisibility
This is the part that got me.
Tax practitioner sites are coaching CPAs on how to handle the new rule. One training guide put it this way:
This calculation will be performed by your software.
Sure.
Your tax software will compute the haircut. It will reduce your deductions. It will spit out a smaller refund or a bigger bill. And no dedicated line on any current form shows you where the money went. The number just changes.
I mean, look. This is elegant work. Congress wrote a rule that clips every itemized deduction by 5.4%, buried it in a fraction that sounds like a homework problem, and let TurboTax do the rest. You never see a line that says "2/37 reduction." You just see a smaller number at the bottom.
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The Fine Print
The bill raised the SALT cap to $40,400. That part is true. It also installed a 5.4% haircut on every itemized deduction you claim. It stuffed them all into one bucket. And it told your software to handle the math.
The $40,400 deduction is worth $38,216. The $100,000 deduction pile saves $35,000, not $37,000. The gap is real. The gap is permanent. And the gap is invisible unless you read a fraction buried on page two-thousand-something of a multi-thousand-page bill.
The government wrote the rules. We're just reading the fine print.
