{f} impose taxes that are too high; require too much, demand too much; overdo, overexert
If you overtax someone or something, you force them to work harder than they can really manage, and may do them harm as a result. a contralto who has overtaxed her voice
If you say that a government is overtaxing its people, you mean that it is making them pay more tax than you think they should pay. You can't help Britain by overtaxing its people