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Pre-tax Paycheck Impact Calculator

Estimate how 401(k), HSA, and FSA contributions can affect paycheck taxes and take-home pay.

What this shows

Pre-tax money is taken out before taxes are calculated. That can lower taxes, but it can also lower the cash you take home because money is going into 401(k), HSA, or FSA first.

The yearly tax savings is a rough estimate of how much less tax you may pay across the year.

State

California

Estimated yearly tax savings

$1,406.40

Take-home without contributions

$2,299.85

Take-home after contributions

$2,192.41

Your paycheck may be smaller because some money is going into 401(k), HSA, or FSA before taxes. The tradeoff is that taxable income may go down.

Change to each paycheck

-$107.45

Annual net difference

-$2,793.60

A pre-tax contribution does not reduce take-home dollar for dollar

Traditional 401(k) contributions generally reduce federal taxable wages and may reduce state taxable wages, but they normally remain subject to Social Security and Medicare. Payroll HSA contributions made through a cafeteria plan can reduce federal income-tax and FICA wages. That difference is why two deductions of the same size can produce different changes in net pay.

This comparison keeps gross pay constant and shows a baseline beside the selected contribution scenario. It is most useful for planning the immediate paycheck effect; contribution limits, employer matches, plan eligibility, and the tax treatment of future withdrawals require separate review.

Worked example

$60,000 salary with a 5% traditional 401(k)

  • Annual contribution: $60,000 × 5% = $3,000.
  • Federal taxable wages can fall by up to $3,000 in this simplified scenario.
  • Social Security and Medicare wages generally do not fall for a traditional 401(k) contribution.

Take-home pay falls by less than the $3,000 contribution because some income-tax withholding is deferred.

Before you rely on the result

  • Use the traditional, not Roth, contribution amount for the pre-tax 401(k) field.
  • Confirm whether an HSA or FSA deduction is made through payroll.
  • Check the current annual contribution limit and your employer match rules.
  • Compare the result against one real paystub before changing an election.

IRS Publication 15-BOfficial guidance on fringe benefits and cafeteria-plan tax treatment.