How much federal tax will be held out from a salary of $1250.00?

Answer 1

A week or a month?
A lot will depend on how many exemptions you put down. You can usually put up to '9' in the exemption box without raising any flags. The higher the number you put in, the lower the tax taken out. However, you may end up owing at the end of the year.

Answer 2

Depends upon what the pay period is -- weekly, monthly, bi-weekly, etc. Go here for some handy estimators: http://www.paycheckcity.com