nondeductible \nondeductible\ adj. not allowable as a tax deduction; as, political contributions are nondeductible. Opposite of {deductible}. [WordNet 1.5]
If you add in state taxes, especially those nondeductible sales taxes, the rosy glow fades even more.
It prompted an IRS study that found many sellers were concealing income and treating large amounts of nondeductible travel and other personal expenses as business costs, Mr. Washburn says.
For this couple, it would be better to file a joint return and for the wife to make a nondeductible IRA contribution if she wants to continue funding her retirement plan.