Topic 03 · 5 min read
Deductions, Explained Simply
A deduction shrinks the income that gets taxed — not the tax itself.
A deduction lowers the amount of income the government is allowed to tax. Its value depends on your tax rate: a $1,000 deduction saves $120 for someone in the 12% bracket and $220 for someone in the 22% bracket. That is why the same deduction is worth different amounts to different people.
What to know
- Deduction math
- Deduction amount times your marginal rate equals the tax saved. It never saves the full dollar.
- Above-the-line adjustments
- Student loan interest, educator expenses, and traditional IRA or HSA contributions come off before AGI and are available even without itemizing.
- Standard or itemized, not both
- You take the flat standard amount or you add up specific expenses. Whichever is larger wins.
- Business expenses are separate
- Self-employed people subtract the costs of doing the work from their revenue first; that happens before either deduction choice.
- Records make it real
- A deduction you cannot document is a deduction you may have to give back if asked.
The tax benefit
Deductions are the main lever for lowering taxable income, and a handful of them are available to nearly every worker, student, and saver.
Worked example
The value of a rate
Two people each contribute $2,000 to a traditional IRA. One is taxed at 12% and saves $240. The other is taxed at 24% and saves $480. Same contribution, very different tax result.
Watch out for
- Most employees cannot deduct unreimbursed work expenses on a federal return.
- A charitable gift only counts when it goes to a qualifying organization, with a receipt.
- Commuting miles from home to a regular job are never deductible.
Terms from this topic
DeductionAdjusted gross incomeMarginal rateAdjustment to income
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