Tax & income
Tax deduction vs. tax credit: Definition, Formula and Example
A tax deduction reduces the income used to calculate tax; a tax credit reduces the calculated tax, subject to the credit’s rules.
Scope: General tax concept with U.S. federal examples; hypothetical rates rather than tax-year thresholds.
Other names and related labels: Income deduction; Tax credit.
How it works
A deduction’s value depends on how it changes taxable income across brackets. A nonrefundable credit generally cannot reduce the relevant tax below zero; a refundable credit may produce a refund if eligibility and other conditions are met. The meaning and availability depend on jurisdiction and tax year.
Simple deduction saving ≈ deductible amount × marginal rate; credit saving is the usable credit amount
The deduction approximation assumes no bracket crossing or interactions. Limitations, phaseouts and refundability can change the result.
$1,000 deduction versus $1,000 usable credit
Assume a 20% marginal rate and $3,000 of pre-adjustment tax.
- Deduction saving: $1,000 × 20% = $200; tax becomes $2,800.
- A separate $1,000 fully usable credit reduces $3,000 to $2,000.
In these separate cases, the deduction saves $200 and the credit saves $1,000.
Hypothetical tax treatment; no phaseouts or bracket changes; enough tax to use the full credit.
The worked example uses the assumptions above. Related tools may model a different scope; check their descriptions before comparing results.
A $1,000 deduction does not usually save $1,000
Some deductions reduce income in a different part of the tax calculation. Some credits are limited or require repayment. Do not treat a credit as cash received without checking how it can be used.
Explore with a calculator
- Income Tax Calculator
Inspect the supported deductions and credits for its labeled tax year.
- Marriage Tax Calculator
Review the included household deductions and credit assumptions.
Sources and checks
Definition and example arithmetic checked . Sources explain the concepts; numerical examples use the assumptions stated above.
Calculation methodology and review status · All glossary terms