TAX: The American Sign Language (ASL) sign for "tax"
The concept of TAX can be conveyed in a few ways.

You can fingerspell it T-A-X:

Or you can use the sign COST which in context could also mean TAX, FEE, FINE, PRICE, CHARGE.

Sample sentence: every-YEAR FEDERAL T-A-X YOU PAY HOW-MUCH-[1h]?

Notes: 

See: COST