To deduct is to remove or take away some amount. If your boss deducts money from your paycheck because you're always late to work, she subtracts it.

When taxes are withheld from your salary, your employer deducts them to pay your contribution. Each time you use a debit card, it deducts the amount you spend from your bank account. A different way to deduct is to come to a reasoned, thoughtful conclusion, or to deduce. The two words were once interchangeable, while now it's more common to use deduct to mean "remove a portion," and deduce to mean "infer logically."

Definitions of deduct

v make a subtraction

subtract, take off
add, add together
make an addition by combining numbers
add, add together, add up, sum, sum up, summate, tally, tot, tot up, total, tote up
determine the sum of
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carry back
deduct a loss or an unused credit from taxable income for a prior period
Type of:
calculate, cipher, compute, cypher, figure, reckon, work out
make a mathematical calculation or computation

v retain and refrain from disbursing; of payments

recoup, withhold
deduct from someone's wages
Type of:
hold on, keep
retain possession of

v reason by deduction; establish by deduction

deduce, derive, infer
gain knowledge of (an area not known or experienced) by extrapolating
infer from incomplete evidence
derive by reason
Type of:
conclude, reason, reason out
decide by reasoning; draw or come to a conclusion

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