tax write-off, tax deduction, deduction -- (a reduction in the gross amount on which a tax is calculated; reduces taxes by the percentage fixed for the taxpayer's income bracket)
deduction, discount -- (an amount or percentage deducted)
deduction, entailment, implication -- (something that is inferred (deduced or entailed or implied); "his resignation had political implications")
deduction, deductive reasoning, synthesis -- (reasoning from the general to the particular (or from cause to effect))
subtraction, deduction -- (the act of subtracting (removing a part from the whole); "he complained about the subtraction of money from their paychecks")
discount, price reduction, deduction -- (the act of reducing the selling price of merchandise)