exemptions?

Example: Gross pay of $660 with 5 exemptions.

:Try the calculator at http://www.paycheckcity.com/

:To look it up, you would also need married or single, and frequency of pay (weekly, biweekly, monthly, semimonthly, etc.)

There are tables in Pub 15 / Circ E. That is what the employer uses, or what the software your employer uses gets its figures.

http://www.irs.gov/pub/irs-pdf/p15.pdf