Gross Pay vs. Net Pay: The Big Picture
Every paycheck starts with two critical numbers at the top: your gross pay and your net pay. Gross pay is your total earnings for the pay period before any deductions — your annual salary divided by the number of pay periods, or your hourly rate multiplied by hours worked (plus overtime, bonuses, and commissions). Net pay is what actually lands in your bank account after every tax, contribution, and garnishment has been subtracted.
The gap between these two numbers can be shocking. For a single person earning $75,000 per year paid biweekly, gross pay per check is about $2,885. After federal income tax, FICA, state tax, health insurance, and 401(k) contributions, net pay might be around $1,850-$2,100. That's a 27-36% reduction. Understanding exactly where that money goes empowers you to make better financial decisions.
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Open Salary Calculator →FICA: The Mandatory Payroll Tax
FICA (Federal Insurance Contributions Act) is a mandatory payroll tax that funds Social Security and Medicare. Every W-2 employee in the United States pays FICA — there are no exemptions, no deductions, and no way to avoid it (short of earning income through a different structure). Here's how it breaks down:
Social Security (OASDI) — 6.2%
This tax funds retirement, disability, and survivor benefits. It applies to your wages up to an annual limit called the "wage base." For 2025, the wage base is $176,100, meaning you pay Social Security tax on the first $176,100 you earn. Any income above this threshold is not subject to Social Security tax. The wage base adjusts annually for inflation.
Medicare (HI) — 1.45%
This tax funds hospital insurance for people 65 and older. Unlike Social Security, Medicare tax has no wage base limit — you pay 1.45% on every dollar you earn, regardless of how much you make.
Additional Medicare Tax — 0.9%
If your wages exceed $200,000 (single) or $250,000 (married filing jointly), you pay an extra 0.9% Medicare tax on the amount above the threshold. Your employer is required to withhold this automatically — you don't need to opt in. Note that your employer does not match this additional tax.
Your employer matches your Social Security and Medicare contributions dollar for dollar, effectively doubling the total FICA tax to 15.3% of your wages. Self-employed individuals pay the full 15.3% themselves (known as SECA or self-employment tax), though they can deduct the employer-equivalent half on their tax return.
Federal Income Tax Withholding
Federal income tax is the largest deduction for most workers. The amount withheld from each paycheck depends on your filing status, income level, and the information you provided on your Form W-4. The US uses a progressive tax system with seven brackets ranging from 10% to 37% (as of 2025).
Important: your entire income is not taxed at your bracket rate. Only the income within each bracket is taxed at that rate. For example, a single filer earning $75,000 in 2025 would pay:
| Bracket | Rate | Income in Bracket | Tax |
|---|---|---|---|
| $0 - $11,925 | 10% | $11,925 | $1,193 |
| $11,926 - $48,475 | 12% | $36,550 | $4,386 |
| $48,476 - $75,000 | 22% | $26,525 | $5,836 |
| Total Federal Tax | $11,415 | ||
That's an effective rate of about 15.2% on $75,000, even though the marginal rate is 22%. Your employer withholds an estimated amount each pay period based on your W-4. If too much is withheld, you get a refund. If too little is withheld, you owe money at tax time.
Pro tip: Use the IRS Tax Withholding Estimator (irs.gov/W4App) to check if your withholding is accurate. Getting it right means neither a large refund (which is an interest-free loan to the government) nor an unexpected tax bill.
State and Local Income Tax
Most states impose their own income tax on top of federal taxes. State tax rates range from zero (in Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington, and Wyoming) to over 13% (California's top bracket). Some states use a flat rate (Pennsylvania at 3.07%, Colorado at 4.4%), while others have progressive brackets like the federal system.
Local income taxes add another layer in some areas. Cities like New York City (up to 3.876%), Philadelphia (3.75%), and Detroit (2.4%) impose their own income taxes on top of state and federal taxes. If you live in a high-tax state and city, your combined marginal tax rate can exceed 45%.
Some states also require State Disability Insurance (SDI) or Paid Family Leave contributions, which appear as small additional deductions on your pay stub. In California, for example, the SDI rate is about 1.1% on the first $153,164 of wages.
401(k) and Retirement Contributions
A 401(k) contribution is typically the largest voluntary deduction. You elect to contribute a percentage of your pre-tax salary (traditional 401(k)) or after-tax salary (Roth 401(k)) to a retirement investment account. For 2025, the contribution limit is $23,500, with a $7,500 catch-up contribution if you're 50 or older.
Traditional 401(k) contributions reduce your taxable income dollar for dollar. If you earn $75,000 and contribute $10,000, you're only taxed on $65,000 of income. This can move you into a lower tax bracket and save thousands in taxes. The money grows tax-deferred until you withdraw it in retirement, when it's taxed as ordinary income.
Roth 401(k) contributions are made with after-tax dollars, so they don't reduce your current taxable income. But withdrawals in retirement are completely tax-free, including all investment gains. This is ideal if you expect to be in a higher tax bracket in retirement.
Many employers offer a matching contribution — typically 50% to 100% of your contributions up to a percentage of your salary (commonly 3-6%). This is free money, and you should always contribute at least enough to capture the full match.
Health Insurance Premiums
If you get health insurance through your employer, your share of the premium is deducted from each paycheck. The average employee contribution for single coverage is about $1,200-$1,500 per year (roughly $50-$60 per biweekly paycheck), while family coverage averages $6,000-$7,000 per year ($230-$270 per paycheck). Your employer typically covers 70-80% of the total premium.
These premiums are often deducted on a pre-tax basis (through a Section 125 cafeteria plan), which means they reduce your taxable income. This saves you money on both federal and state income taxes, plus FICA — a meaningful benefit that many people overlook.
Other Common Deductions
Beyond the major categories above, your paycheck may include several additional deductions:
Health Savings Account (HSA)
If you have a high-deductible health plan (HDHP), you can contribute pre-tax dollars to an HSA. The 2025 limits are $4,300 for individuals and $8,550 for families (with $1,000 catch-up at 55+). HSA funds roll over forever, grow tax-free, and can be used for qualified medical expenses. It's one of the most tax-advantaged accounts available.
Dental and Vision Insurance
Separate from health insurance, these cover dental work and eye care. Premiums are typically $10-$40 per paycheck for dental and $5-$15 for vision, often deducted pre-tax.
Life Insurance and Disability Insurance
Basic group life insurance (often 1-2x your salary) may be employer-paid. Supplemental coverage and short-term/long-term disability premiums appear as small deductions, typically $10-$50 per paycheck depending on coverage level.
Commuter Benefits
Pre-tax deductions for transit passes, parking, and bicycle commuting. The 2025 limit is $325/month for transit and $325/month for parking. This saves you income and FICA taxes on commuting costs.
Garnishments and Court Orders
Child support, alimony, tax levies, and creditor garnishments are court-ordered deductions that take priority over almost everything else. These are calculated based on specific formulas and are non-negotiable.
Sample Paycheck Breakdown
Here's a realistic example for a single person earning $85,000 per year in California, paid biweekly (26 pay periods), contributing 10% to 401(k) with employer health insurance:
| Line Item | Per Paycheck | Annual |
|---|---|---|
| Gross Pay | $3,269.23 | $85,000.00 |
| 401(k) (10% pre-tax) | -$326.92 | -$8,500.00 |
| Health Insurance (employee share) | -$125.00 | -$3,250.00 |
| Dental + Vision | -$18.50 | -$481.00 |
| HSA Contribution | -$82.31 | -$2,140.00 |
| Federal Income Tax | -$385.00 | -$10,010.00 |
| Social Security (6.2%) | -$202.69 | -$5,270.00 |
| Medicare (1.45%) | -$47.40 | -$1,232.50 |
| California State Tax | -$195.00 | -$5,070.00 |
| CA SDI (1.1%) | -$35.96 | -$935.00 |
| Net Pay | $1,850.45 | $48,111.50 |
Out of $85,000 in gross earnings, this person takes home about $48,100 — an effective total deduction rate of about 43%. The single largest deduction is the 401(k) contribution (10%), followed by federal income tax and California state tax. Pre-tax deductions (401(k), health insurance, HSA, dental/vision) reduce taxable income, which is why the federal and state taxes are calculated on less than the full $85,000.
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Net Income Calculator →How to Optimize Your Paycheck
Once you understand what's coming out of your paycheck, you can start optimizing:
- Max the 401(k) match. This is the single highest-ROI financial move available to most employees. An employer match of 50% on 6% of salary is an instant 3% raise.
- Adjust your W-4. If you consistently get large refunds (over $1,000), you're over-withholding. Reduce withholding and put the extra take-home pay to work in a high-yield savings account or investments.
- Fund your HSA. If you're eligible, max out your HSA before increasing 401(k) contributions beyond the match. The HSA's triple tax advantage (deductible, tax-free growth, tax-free withdrawals) makes it unbeatable.
- Review your benefits annually. During open enrollment, compare your actual healthcare usage to your coverage. You may be over-insured and paying for coverage you don't use.
- Consider a Roth 401(k). If you're in a relatively low tax bracket now, Roth contributions lock in today's low rates and give you tax-free income in retirement.
What Your Pay Stub Abbreviations Mean
| Abbreviation | Meaning |
|---|---|
| FICA / OASDI | Social Security tax (6.2%) |
| HI / MEDI | Medicare tax (1.45%) |
| FIT / Fed Tax | Federal Income Tax withholding |
| SIT / State Tax | State Income Tax withholding |
| SSN / SOC SEC | Social Security Number (identification) |
| YTD | Year-to-Date (cumulative total) |
| PTD / MTD | Period-to-Date / Month-to-Date |
| PRE-TAX / BEFORE TAX | Deducted before income tax calculation |
| POST-TAX / AFTER TAX | Deducted after income tax calculation |
| GROSS / GRS | Total earnings before deductions |
| NET / TAKE HOME | Earnings after all deductions |
Frequently Asked Questions
What is FICA on my paycheck?
FICA stands for Federal Insurance Contributions Act. It consists of two taxes: Social Security (6.2% of your wages up to the annual wage base, which is $176,100 in 2025) and Medicare (1.45% of all wages with no cap). If you earn over $200,000, you pay an additional 0.9% Medicare surtax on the excess. Your employer matches both contributions, so the total FICA tax is 15.3% of your wages.
Why is my paycheck so much less than my salary?
The difference between your gross pay and net pay (take-home pay) comes from mandatory deductions (FICA, federal income tax, state/local taxes) and voluntary deductions (health insurance, 401(k) contributions, HSA, dental, vision, life insurance, etc.). For a typical single person earning $75,000, federal + state + FICA taxes alone reduce gross pay by roughly 25-30% before any voluntary deductions.
What is the difference between gross pay and net pay?
Gross pay is your total earnings before any deductions — your salary or hourly rate multiplied by hours worked, plus bonuses, commissions, and overtime. Net pay (also called take-home pay) is what's left after all deductions are subtracted. Net pay is the amount that actually hits your bank account. The difference between gross and net is typically 25-40% depending on your tax bracket, state, and benefit elections.
How much should I contribute to my 401(k)?
At minimum, contribute enough to capture your full employer match — this is free money. After that, aim for 10-15% of your gross income (including employer match). If you're 50 or older, take advantage of catch-up contributions. Every dollar you contribute reduces your taxable income today and grows tax-deferred until retirement.
Can I change my tax withholding?
Yes. Submit a new Form W-4 to your employer's HR or payroll department. You can adjust your withholding at any time — more allowances or fewer dependents claimed means less tax withheld (bigger paychecks, potentially smaller refund). The IRS provides a Tax Withholding Estimator on their website to help you dial in the right amount.