Why is my take-home pay so much less than my gross?
Between federal income tax (10%–37% on a progressive scale), state income tax (0%–13% depending on where you live), Social Security (6.2% up to $184,500), and Medicare (1.45% with no cap), plus any benefits and 401(k) deductions, total reductions typically range from 25% to 40% of gross pay. Higher earners and high-tax states sit at the top of that range.
What is FICA?
FICA stands for the Federal Insurance Contributions Act and refers to the combined Social Security (6.2%) and Medicare (1.45%) payroll taxes — 7.65% total taken from each paycheck. Your employer pays a matching 7.65% that you never see on your stub. FICA funds Social Security retirement, disability, survivor benefits, and Medicare hospital insurance.
How is federal income tax actually withheld?
Employers use the IRS Percentage Method in Publication 15-T. They take your annualized gross, subtract a standard deduction tied to your W-4 filing status, walk the bracket table to get an annual tax, then divide by the number of pay periods. This calculator does the same thing in a simplified way — it does not model the W-4 multiple-jobs, dependents, or extra-withholding adjustments.
Should I increase my 401(k) contribution?
If your employer offers a match, contribute at least enough to capture it — that match is an immediate 50%–100% return. Beyond the match, traditional 401(k) contributions reduce your federal and state taxable income now (not FICA), but they're locked up until retirement. Each $100 contributed typically reduces take-home by only $70–$80 because of the tax savings.
Pre-tax vs post-tax deductions — which is better?
Pre-tax deductions (traditional 401(k), HSA, FSA, standard health premiums) lower your taxable income, so you pay less tax now. Post-tax deductions (Roth 401(k), Roth IRA contributions through payroll, life insurance buy-ups) come out of money you've already paid tax on, but qualified withdrawals are tax-free. Younger workers in lower brackets often prefer Roth; high earners near retirement often prefer pre-tax.
What's the difference between bi-weekly and semi-monthly?
Bi-weekly means every two weeks — 26 paychecks per year, and two months will have three paychecks. Semi-monthly means twice a month, usually the 15th and last day — 24 paychecks per year, all months identical. Annual gross is the same, but each bi-weekly check is slightly smaller than each semi-monthly check because the same annual amount is spread across more pay periods.
Why does my Social Security tax disappear later in the year?
The 6.2% Social Security tax only applies up to the annual wage base — $184,500 in 2026. Once your year-to-date gross passes that limit, your employer stops withholding Social Security for the rest of the year, and your take-home pay jumps. Medicare has no such cap, so it keeps coming out of every paycheck.
What is the Additional Medicare Tax of 0.9%?
Employers are required to withhold an extra 0.9% Medicare tax on individual wages above $200,000 in a calendar year, regardless of filing status. There is no employer match for the surtax. The IRS reconciles it on your tax return against the household threshold ($200,000 single, $250,000 married filing jointly). This calculator does not model the surtax, so high earners will see a slight under-estimate.
How does overtime affect my paycheck?
Under the Fair Labor Standards Act, non-exempt employees must be paid at least 1.5 times their regular rate for hours over 40 in a workweek. Overtime pay is taxed at your marginal rate, not a special higher rate — it can feel like overtime is taxed more because a single large paycheck pushes the IRS withholding tables into a higher bracket. At year-end, total tax owed is the same as if the income were spread evenly.
Can I claim exempt from federal withholding?
Only if you had zero federal income tax liability last year and expect zero this year. Most working adults don't qualify. Claiming exempt incorrectly leads to a large tax bill plus possible underpayment penalties at filing time. If you simply want less withheld, adjust the dependents or extra-withholding fields on your W-4 rather than claiming exempt.
Does this calculator handle Roth 401(k) contributions?
No — the 401(k) Contribution (%) field assumes a traditional pre-tax contribution that reduces federal and state taxable income. Roth 401(k) contributions come out of post-tax pay, so your take-home would be lower than what this calculator shows by the contribution amount. The tradeoff: Roth distributions in retirement are tax-free.
Why doesn't my real pay stub match this calculator exactly?
Real payroll uses the IRS Percentage Method tables, which account for W-4 entries this tool doesn't capture (multiple jobs, dependent credits, extra withholding). Your state may use progressive brackets or local taxes (NYC, Philadelphia, SDI in California) that the simplified flat rate here doesn't model. Treat this as a planning estimate within roughly 5%–10% of your actual stub.
