Tax Deduction Value Calculator
Find out how much a tax deduction actually saves you.
Enter the deduction amount and your federal tax bracket to see the real after-tax dollar savings.
Changing your currency elsewhere on the site will not affect this page.
Tax deduction dollar value works out what a deductible expense actually saves you. A deduction reduces your taxable income, not your tax bill, so a dollar of deduction is never worth a dollar.
Core formula: Tax Savings = Deduction Amount × Marginal Tax Rate
Where:
- Deduction Amount = the expense that is tax-deductible (business costs, mortgage interest, charitable donations, etc.)
- Marginal Tax Rate = the rate on your last dollar of income, your top bracket, federal plus state where the state taxes income too
Key concept: A deduction reduces taxable income. A tax credit reduces the tax bill directly. A $1,000 deduction at a 24% marginal rate saves $240 in taxes. A $1,000 tax credit saves $1,000 regardless of your bracket.
2026 federal marginal rates, single filers, applied to taxable income:
| Taxable income | Rate |
|---|---|
| $0 to $12,400 | 10% |
| $12,400 to $50,400 | 12% |
| $50,400 to $105,700 | 22% |
| $105,700 to $201,775 | 24% |
| $201,775 to $256,225 | 32% |
| $256,225 to $640,600 | 35% |
| Over $640,600 | 37% |
The condition nobody puts in the headline. A deduction is only worth anything if it is actually coming off your taxable income. Business expenses on Schedule C always do. Personal deductions such as charitable giving and mortgage interest go on Schedule A, and they do nothing at all unless your itemized total already beats the standard deduction. Give $5,000 to charity when your other itemized deductions come to $8,000 and your standard deduction is $16,100, and the tax saving is exactly zero. Only the amount above the standard deduction has any value.
That is why the honest way to read the number on this page is “what this deduction is worth if it reduces your taxable income by the full amount”. For a business expense, that is always true.
Worked examples:
Example 1, a charitable donation: You donate $5,000. Your marginal rate is 22%. Tax savings = $5,000 × 0.22 = $1,100 saved Net cost of the donation = $5,000 − $1,100 = $3,900 out of pocket
Example 2, a home office: Home office deduction: $3,600. Marginal rate: 32%. Tax savings = $3,600 × 0.32 = $1,152 saved
Example 3, business equipment under Section 179: Equipment cost: $12,000. Marginal rate: 24%. Tax savings = $12,000 × 0.24 = $2,880 saved in year 1
State taxes: Add your state income tax rate to the federal rate for total savings. In high-tax states (California 13.3%, New York 10.9%), the combined marginal rate can reach 50%+ for top earners.
How we build and check this calculator
This calculator runs entirely in your browser, so the numbers you enter stay on your device. The math behind it is written by hand and tested against worked examples and standard references before the page goes live.
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