tax/ tæks /

1.noun [c/u] 
(on goods,income etc) 税

2.vt.[+earnings] [ goods etc] 
对…征税

3.vt.[+person] [ memory] [ patience] 
(test) 考验

That question really taxed him.
那个问题对他真是个考验。
before/after tax
税前/后
free of tax
免税的