Tax Deductions on Your Salary Explained (2025)

“Tax deductions on your salary” can mean two different things, and mixing them up is where a lot of confusion starts. The first is the deductions you see come out of your paycheck — federal tax, FICA, state tax. The second, and the one that actually saves you money, is the deductions that reduce the salary you’re taxed on in the first place. This guide is about the second kind: what lowers your taxable income, and what doesn’t.

Pre-tax deductions: the ones that lower your tax

Pre-tax (or “above-the-line”) deductions come out of your gross salary before income tax is calculated, so every dollar you contribute is a dollar the IRS doesn’t tax. The common ones for salaried employees are:

• Traditional 401(k) or 403(b). Up to $23,500 in 2025 ($31,000 if you’re 50+). Lowers your income tax, but not Social Security and Medicare — see how a 401(k) affects your take-home pay.
• Health Savings Account (HSA). Up to $4,300 (self) or $8,550 (family) in 2025. When contributed through payroll, it reduces both income tax and FICA — one of the most tax-efficient deductions available.
• Flexible Spending Account (FSA). Up to $3,300 in 2025 for healthcare; also reduces income tax and FICA, but it’s “use it or lose it.”
• Employer health, dental and vision premiums. Usually deducted pre-tax under a Section 125 “cafeteria” plan, lowering both income tax and FICA.
• Traditional IRA contributions. Up to $7,000 in 2025 and potentially deductible on your return (income limits apply if you also have a workplace plan).
• Commuter / transit benefits. Up to $325/month in 2025, pre-tax.

The standard deduction does the heavy lifting

On top of any contributions, every taxpayer gets the standard deduction — $15,000 for single filers and $30,000 for married couples filing jointly in 2025. It’s subtracted from your income automatically, so the first slice of your salary is never taxed at all. Most employees take it rather than itemizing.

After-tax deductions: they don’t cut your tax bill

Some things also come out of your paycheck but after tax is calculated, so they don’t reduce your taxable income:

• Roth 401(k) and Roth IRA contributions — taxed now, tax-free later.
• After-tax insurance such as some disability or life cover.
• Wage garnishments and union dues in most cases.

These shrink your take-home pay, but they don’t lower the salary the IRS taxes — the trade-off for Roth accounts being tax-free growth and withdrawals.

A quick example

Say you earn $80,000 and contribute 10% ($8,000) to a traditional 401(k) and $2,000 to an HSA. Your taxable income for income-tax purposes drops to about $70,000 before the standard deduction — saving roughly $2,200 at the 22% marginal bracket. The HSA portion also saves about $153 in FICA. The 401(k) portion doesn’t reduce FICA, so Social Security and Medicare are still charged on the full $80,000.

See your own deductions

Our calculator lets you add a 401(k) percentage and your state to see exactly how pre-tax deductions change your take-home pay. For the full picture of every line that comes out, read how much tax comes out of your paycheck and how to read your pay stub.