Why Your Net Pay Is Smaller Than Your Salary
A $75,000 annual salary does not produce $75,000 in take-home pay. Between the gross figure on an offer letter and the net figure deposited to a bank account, the IRS (federal income tax), the Social Security Administration, and Medicare each take a share — plus any voluntary pre-tax deductions the employee elects. Understanding each piece demystifies the stub and allows a worker to accurately project take-home pay before accepting a job, adjusting a W-4, or evaluating a benefits election.
The calculation follows a consistent four-step structure for most salaried US employees: (1) determine taxable income by subtracting pre-tax deductions and the standard deduction from gross income; (2) apply marginal federal tax brackets to the taxable amount; (3) apply FICA taxes (Social Security and Medicare) to gross income; (4) subtract all withholdings and deductions from gross to arrive at net pay.
This guide uses the 2026 federal tax year values, consistent with the calculator’s underlying constants.
The Four Withholding Components Explained
Federal Income Tax: Marginal Brackets
Federal income tax uses a marginal (progressive) rate structure, meaning different portions of income are taxed at different rates. The 2026 brackets for a single filer are:
| Taxable income | Rate |
|---|---|
| $0 – $12,400 | 10% |
| $12,400 – $50,400 | 12% |
| $50,400 – $105,700 | 22% |
| $105,700 – $201,775 | 24% |
| $201,775 – $256,225 | 32% |
| $256,225 – $640,600 | 35% |
| Over $640,600 | 37% |
Marginal means the 22% rate applies only to the income above $50,400, not to the entire salary. A worker earning $75,000 is not a “22% taxpayer” on all of their income — only on the slice above $50,400.
Before applying the brackets, taxable income is reduced by pre-tax deductions and the standard deduction. For a single filer in 2026, the standard deduction is $16,100 — income below that threshold is not taxed at all.
Social Security: A Proportional Tax with a Wage Cap
Social Security is collected under FICA (Federal Insurance Contributions Act) at a flat 6.2% on all wages up to the 2026 wage base of $184,500. Earnings above $184,500 are not subject to Social Security tax. The flat rate means every dollar below the cap costs exactly the same percentage — unlike the marginal structure of federal income tax.
Medicare: Flat with a High-Earner Surcharge
Medicare is collected at 1.45% on all wages, with no cap. Employees earning above $200,000 (single filers) or $250,000 (married filing jointly) also pay an additional 0.9% on the amount above those thresholds. The additional Medicare tax is an employee-only charge — employers do not match it.
Pre-Tax Deductions: The Adjustments That Reduce Federal Tax
Pre-tax deductions — commonly 401(k) contributions, health insurance premiums, FSA or HSA contributions, and certain dependent care benefits — are subtracted from gross pay before the federal income tax calculation runs. This reduces taxable income, which lowers the federal withholding. However, pre-tax deductions do not reduce Social Security or Medicare wages: FICA applies to gross earnings regardless of elected deductions.
Worked Example: $75,000 Salary, Single Filer, Biweekly Pay
A single employee earning $75,000 per year, paid biweekly (26 paychecks per year), with no pre-tax deductions elected.
Step 1: Taxable Income
Gross income: $75,000
Standard deduction: −$16,100
Taxable income: $58,900Step 2: Federal Income Tax (Marginal Brackets)
10% on first $12,400: $1,240.00
12% on $12,400 → $50,400 ($38,000): $4,560.00
22% on $50,400 → $58,900 ($8,500): $1,870.00
Total federal income tax: $7,670.00The effective federal income tax rate on gross income is $7,670 ÷ $75,000 = approximately 10.2%. The marginal rate — the rate on the last dollar earned — is 22%.
Step 3: FICA
Social Security: $75,000 × 6.2% = $4,650.00
Medicare: $75,000 × 1.45% = $1,087.50
Total FICA: $5,737.50(No additional Medicare tax applies because income is below $200,000.)
Step 4: Net Pay
Gross income: $75,000.00
Federal tax: −$7,670.00
Social Security: −$4,650.00
Medicare: −$1,087.50
Net (take-home) annual: $61,592.50Annual take-home: $61,592.50. Per biweekly paycheck: $2,368.94. The effective take-home rate — net as a percentage of gross — is 82.12%.
Of the $13,407.50 withheld, $7,670 goes to federal income tax and $5,737.50 to FICA. A common source of surprise is that FICA — which many workers think of as a fixed small deduction — totals 7.65% of gross income and represents a larger share of the withholding than federal income tax for many mid-income earners.
How to Use the Take-Home Paycheck Calculator
The calculator accepts gross income in annual, monthly, or per-paycheck form, then converts to an annual figure for the computation.
Pay frequency determines how the annual withholding is divided into per-paycheck amounts:
- Weekly: 52 paychecks
- Biweekly: 26 paychecks
- Semimonthly: 24 paychecks
- Monthly: 12 paychecks
Filing status maps to the standard deduction and bracket thresholds. A married filer has a higher standard deduction ($32,200 for married filing jointly in 2026) and wider bracket thresholds, which generally reduces the effective federal tax rate at the same gross income compared to a single filer.
Pre-tax deductions (entered per paycheck) reduce the federal taxable income calculation. Entering $200 per paycheck of 401(k) contributions on 26 biweekly paychecks totals $5,200 in annual pre-tax deductions. The taxable income would fall to $53,700 (from $58,900), dropping the 22%-bracket slice and reducing annual federal tax by $1,144. The take-home per paycheck increases by roughly $44 even though $200 left the paycheck — a net cost of only $156 per paycheck for a $200 retirement contribution.
Additional withholding (W-4 Step 4c) allows employees who expect to owe additional tax at filing — for example, those with freelance income or multiple jobs — to elect extra withholding per pay period beyond the standard amount.
Common Scenarios and What the Math Shows
The Effect of a Raise on Take-Home Pay
A raise from $75,000 to $100,000 adds $25,000 to gross pay. Of that additional $25,000:
- The first portion falls in the 22% bracket ($105,700 − $75,000 = $30,700 of bracket room), so all $25,000 in additional taxable income is taxed at 22%.
- FICA applies to the additional gross at 7.65%.
- The additional take-home from the raise is roughly: $25,000 × (1 − 0.22 − 0.0765) = approximately $17,588.
This illustrates the distinction between the marginal rate (22% on the added income) and the average rate (which is lower because the brackets below it were taxed at 10% and 12%). The marginal rate is what matters when evaluating the after-tax benefit of a salary increase or a deductible contribution.
Pre-Tax Benefits and the Hidden Pay Increase
Electing health insurance through an employer’s Section 125 cafeteria plan typically makes the premium pre-tax. A premium of $300 per month ($3,600 annual) reduces federal taxable income by $3,600. For a single filer in the 22% bracket, the federal tax savings is $792 annually — meaning a benefit that “costs” $3,600 in salary reduction only reduces after-tax income by approximately $2,808 (plus $275 in FICA on the pre-tax amount). The calculator captures this when the monthly premium is entered as a pre-tax deduction.
Multiple Jobs or Freelance Income
Employees with two W-2 jobs or significant freelance/self-employment income may find that their total 2026 tax liability exceeds what was withheld during the year. Each employer withholds as if their job is the worker’s only income, so the combined income may land in a higher bracket than either employer anticipated. The W-4 Step 4c additional withholding field addresses this — adding a per-paycheck amount to cover the expected shortfall before the April filing deadline.
State Income Tax
Federal withholding is only part of the total picture. Most states levy their own income tax, which the federal calculator does not include. State rates range from 0% (Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington, Wyoming) to over 13% (California’s top rate). Workers in high-tax states may find their combined effective rate substantially higher than the federal estimate alone.
Frequently Asked Questions
Why are SS and Medicare deducted on gross pay rather than taxable income? Social Security and Medicare taxes (FICA) apply to wages, which the IRS defines as gross compensation before most deductions. Pre-tax deductions like 401(k) contributions reduce federal income tax (which applies to taxable income) but not FICA (which applies to gross wages). This is why electing a 401(k) saves federal income tax but not FICA — the two taxes have different bases.
What is the difference between an effective tax rate and a marginal rate? The effective federal income tax rate is total federal tax divided by gross income — it measures what fraction of total income goes to federal tax. The marginal rate is the rate that applies to the last (highest) dollar of taxable income. A single filer at $75,000 gross has an effective federal rate of about 10.2% and a marginal rate of 22%. These diverge because the lower brackets (10%, 12%) cover the first $50,400 of taxable income at lower rates.
Do pre-tax 401(k) contributions reduce my Social Security benefit calculation? Not directly. The Social Security Administration calculates future benefits based on the highest 35 years of wage-indexed earnings on record. Pre-tax 401(k) contributions reduce taxable income (and thus federal tax) but do not reduce the earnings record used for benefit calculations — the SSA uses gross wages as reported on the W-2, not taxable income.
What is a W-4 and how does it affect withholding? The W-4 (Employee’s Withholding Certificate) is the form an employee files with their employer to specify how much federal income tax to withhold from each paycheck. Modern W-4 forms (2020 onward) do not use allowances — instead, they have employees enter income from other jobs, dependent care tax credits, and additional withholding amounts. The employer uses the W-4 data along with the IRS Publication 15-T tables to compute each paycheck’s withholding. Updating the W-4 mid-year takes effect on the next payroll cycle; the prior withholding is not recalculated retroactively.
What happens if I claim exempt from withholding? An employee who expects to owe no federal income tax (because their taxable income falls below the standard deduction) may claim exempt status on the W-4, which instructs the employer to withhold zero federal income tax. FICA is still collected regardless of exempt status. Claiming exempt when income will exceed the no-tax threshold results in a tax bill at filing — the withholding exemption only suspends withholding, not the underlying tax obligation.