Is it true you don't necessarily have to have federal taxes withdrawn from a paycheck?

Two reasons you may have no federal taxes taken is if you claim exempt on your W4 or if you claim a higher amount of dependents.

Possible reasons: 1) Your income is very low. 2) The number of withholding allowances on your W-4 is very high. 3) You claimed "exempt" on your W-4. 4) Your employer is treating you as a contractor...

Yes, in fact you must. Filing taxes and how you pay them are 2 different things. They are supposed to be paid through the year, quarterly by estimated payments or through payroll withholding. You...

That depends on how many people you are claiming as dependants.

Of course.