How Will My Pretax 403(b) or 457 Plan Contributions Affect My
Take-Home Pay?

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If you contribute to your 403(b) or 457 plan on a pretax basis (that is, through a traditional 403(b) or 457 plan, not a Roth account, which is an after-tax account), the amount you contribute ends up being more than the total deduction from your paycheck. That's because the money is deducted before federal or state income taxes are taken out. This calculator will help you determine how your contribution amount will affect your paycheck. You can also use it to see how an increase in your contribution amount can affect your paycheck.