physically or mentally demanding

they find the work too taxing

impose a tax on (someone or something)

the income will be taxed at the top rate

make heavy demands on (someone's powers or resources)

she knew that the ordeal to come must tax all her strength

confront (someone) with a fault or wrongdoing

why are you taxing me with these preposterous allegations?

examine and assess (the costs of a case)

an officer taxing a bill of costs