Now that depends on which bracket your salary is falling into.
An individual`s marginal income tax bracket depends upon his income and his tax-filing classification.
As of 2010,
there are six tax brackets for ordinary income (ranging from 10% to 35%)
and four classifications:
married filing jointly (or qualified widow or widower),
married filing separately,
and head of household.
Taxpayers are also allowed a personal exemption depending on their filing status.
The personal exemption amount in 2009 is $3,650 per person.
The link will help you in calculating the tax rate you need to pay: