Pre-tax benefits are deductions your employer takes out of your paycheck before calculating income tax withholding. The most common are retirement plan contributions (401(k), 403(b), traditional IRA via payroll), health insurance premiums, health savings account (HSA) deposits, and flexible spending account (FSA) contributions. Because these dollars are removed before federal and state income tax is calculated, they lower your taxable income and reduce the amount of tax withheld — but they also lower the net pay that hits your bank account.
How 401(k) and 403(b) contributions work
When you elect to contribute a percentage of your salary to a traditional 401(k) or 403(b), that amount is deducted from your gross pay before income tax. For 2025, the contribution limit is $23,000 if you are under 50, or $30,500 if you are 50 or older. If you contribute $500 per paycheck, your taxable income drops by $500, which saves you roughly $110 in federal tax (at a 22% marginal rate) plus state tax. The trade-off is that your paycheck is $500 smaller, though the tax savings means your net pay only drops by around $390. The money grows tax-deferred in the 401(k), and you pay income tax when you withdraw it in retirement. Roth 401(k) contributions work differently: they come out after-tax, so they do not reduce your current taxable income or withholding, but qualified withdrawals in retirement are tax-free.
Health insurance premiums
If your employer offers health insurance and you enroll, your share of the premium is typically deducted pre-tax from each paycheck. The amount varies widely by plan and employer, but $100 to $300 per pay period is common for employee-only coverage, and family coverage can be $400 or more. Because the premium is pre-tax, you save income tax on that amount — a $200 premium saves you roughly $44 in federal tax at a 22% rate — but your paycheck is still $200 lighter. Some employers offer a Section 125 cafeteria plan that lets you pay premiums pre-tax even if the default is after-tax; check with your HR department if you are not sure.
Health savings accounts and flexible spending accounts
An HSA is available if you have a high-deductible health plan. You can contribute pre-tax dollars up to $4,300 for self-only coverage or $8,550 for family coverage in 2025, and the money rolls over year to year. You can invest HSA funds, and withdrawals for qualified medical expenses are tax-free. An FSA is a use-it-or-lose-it account; you elect an amount at the start of the year (up to $3,200 in 2025 for a health-care FSA), and it is deducted evenly from each paycheck. FSA funds must be spent by year-end or you forfeit them, though some plans offer a grace period or a small carryover. Both HSA and FSA contributions are pre-tax, lowering your taxable income and your paycheck.
The net effect on your budget
Pre-tax benefits are valuable — they cut your tax bill and help you save for retirement and health costs — but they can make your take-home pay feel surprisingly low. If you contribute 10% to your 401(k), pay $200 per pay period for health insurance, and put $100 into an HSA, that is $300 to $500 per paycheck that never reaches your bank account. When you budget, use your net pay after all deductions, not your gross salary. Mora links to your bank and credit card accounts and shows your actual cash flow, so you are budgeting the money you have, not the money your employer lists on your offer letter. The app's 50/30/20 budget automatically splits your real take-home into needs, wants, and savings, and the AI companion can explain why your paycheck is smaller than you expected and whether adjusting your 401(k) contribution or FSA election makes sense for your goals.
