How Your Paycheck Is Calculated
Your take-home pay is your gross salary minus all deductions: federal income tax withholding, Social Security tax (6.2%), Medicare tax (1.45%), state income tax, and any pre-tax or post-tax deductions you elect. Understanding each withholding helps you optimize your W-4 and maximize take-home pay.
FICA Taxes: Social Security and Medicare
FICA (Federal Insurance Contributions Act) taxes fund Social Security and Medicare. Social Security: 6.2% of wages up to the 2026 wage base of $176,100. Medicare: 1.45% of all wages (no cap). High earners (over $200,000 single / $250,000 married) pay an additional 0.9% Additional Medicare Tax on wages above those thresholds. Your employer matches the 6.2% + 1.45% — so the total FICA cost is 15.3% (split 50/50).
How Pre-Tax Deductions Boost Take-Home Pay
Pre-tax deductions (401k contributions, HSA, health insurance premiums) are deducted before calculating federal income tax and often FICA taxes. If you're in the 22% federal bracket and contribute $500/month to your 401k, your federal tax bill drops by $110/month ($1,320/year). That means for every $500 you save for retirement, your actual paycheck reduction is only $390 (at 22% bracket).
How to Adjust Your W-4 for Better Withholding
The W-4 determines how much federal income tax is withheld from each paycheck. If you regularly receive a large refund, you are over-withholding — consider adjusting your W-4 to have more take-home pay throughout the year. If you owe money at filing, under-withholding could trigger penalties. Use the IRS Tax Withholding Estimator (available at IRS.gov) alongside our calculator for precise guidance.
Frequently Asked Questions
Take-home pay = Gross Pay − Federal Income Tax Withholding − Social Security Tax (6.2%) − Medicare Tax (1.45%) − State Income Tax − Pre-tax Deductions (401k, HSA, health insurance) − Post-tax Deductions.
Social Security tax (OASDI) is 6.2% of gross wages up to the Social Security wage base ($176,100 for 2026). Employers match this 6.2%. Once you hit the wage base, no more Social Security tax is withheld for the rest of the year.
Medicare tax is 1.45% of all wages with no income cap. High earners (over $200,000 for single / $250,000 for married) pay an additional 0.9% Additional Medicare Tax on amounts above these thresholds.
The new Form W-4 (post-2020) uses dollar amounts rather than allowances. You can claim additional deductions, additional withholding, or exemptions. The closer your withholding is to your actual tax liability, the smaller your refund or amount owed at filing.
Pre-tax deductions include: 401k/403b contributions, Health Savings Account (HSA) contributions, Flexible Spending Account (FSA) contributions, employer-sponsored health insurance premiums, dental, and vision premiums.
Neither is strictly better, but a large refund means you over-withheld (giving the government an interest-free loan). A better strategy is to withhold just enough to avoid penalties and invest the difference. The IRS charges penalties if you underpay by more than $1,000.
Pay frequency (weekly, bi-weekly, semi-monthly, monthly) affects how withholding tables are applied, but annual totals are approximately the same. Bi-weekly payroll (26 checks/year) results in two "extra" paychecks compared to semi-monthly (24 checks/year).
Nine states have no state income tax: Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington, and Wyoming. New Hampshire taxes investment income but not wages.
Legal strategies: maximize pre-tax 401k contributions ($23,500 limit in 2026), contribute to an HSA (if eligible), use FSA for medical/childcare, adjust W-4 for proper allowances, and consult a tax professional about any applicable deductions.
Annual salary ÷ pay periods = gross pay per period. Hourly: hours worked × hourly rate = gross pay, with overtime (1.5× rate) for hours over 40/week under the FLSA. Our calculator handles both modes.