To impose and collect a tax from (a person or company).

“Some think to tax the wealthy is the fairest.”

To impose and collect a tax on (something).

“Some think to tax wealth is destructive of a private sector.”

To make excessive demands on.

“Do not tax my patience.”

The act of imposing a tax.

With respect to an experience: exhausting; draining.

Burdensome, difficult.

“a taxing problem”