A pecuniary levy

fine, charge, rate, obligation, price, cost, contribution, expense; see also dues.

Antonyms discount*, interest*, allowance. *

Taxes include: processing tax, assessment tax, toll, excise, custom, levy, impost, duty, revenue tax, tariff, tribute, dues, capital gains, capitation, tithe, towage, salvage, wharfage, brokerage, freightage, poll tax, income tax, sales tax, property tax, excise tax, inheritance tax, cigarette tax, meals tax, gift tax, estate tax, gasoline tax, luxury tax, county tax, city tax, state tax, federal tax, excess-profit tax, surtax, corporation tax, single tax.

A burden

strain, task, difficulty, imposition, demand; see also burden 2.

To cause to pay a tax

assess, exact from, demand, lay an impost, exact tribute, charge duty, demand toll, require a contribution, enact a tax; see also require 2.

To accuse

censure, charge, tax with, reprove, reproach; see also accuse.

To burden

encumber, weigh down, overload; see burden.