Calculation Methodology & Worked Examples
RaiseCalculator estimates changes in gross pay, selected taxes and purchasing power. This page makes the assumptions explicit so you can reproduce the numbers without relying on a black box. Last checked October 5, 2026.
Gross pay and pay periods
The pay raise calculator supports three inputs: a percentage increase, a flat amount in the selected pay period, or a new pay rate. For a percentage r, new pay = old pay × (1 + r/100). For a flat increase a, new pay = old pay + a. From two pay rates, raise % = (new − old) / old × 100.
Annual conversions use 52 paid weeks, 26 bi-weekly checks, 24 semi-monthly checks, 12 months and 260 working days. Hourly pay is annualized using your hours per week × 52. The daily equivalent assumes five working days a week. These are comparison conventions; they do not recreate your employer's payroll calendar.
Worked checks you can reproduce
| Inputs | Expected result | Check |
|---|---|---|
| $60,000 a year, 3% | $61,800 new salary; $1,800 increase | 60,000 × 1.03 |
| $20 an hour, +$1, 40 hours/week | $21/hour; $2,080 extra/year | 1 × 40 × 52 |
| $60,000 to $63,000 | 5% raise | 3,000 / 60,000 × 100 |
| $60,000, two 5% raises | $66,150 after the second raise | 60,000 × 1.05² |
| 3% raise, 3.4% inflation | −0.3868% real change | (1.03 / 1.034 − 1) × 100 |
Federal tax and retirement contributions
The tax panel calculates estimated annual federal income tax twice, before and after the raise, then takes the difference. It uses the selected filing status, the 2026 standard deduction and progressive brackets from IRS Revenue Procedure 2025-32. It assumes one wage earner, no other income, the basic standard deduction and no credits or additional deductions. Married filing separately is not supported.
The traditional 401(k) percentage reduces federal taxable income. It does not reduce Social Security or Medicare wages. The additional contribution is also subtracted from the cash increase. The model holds the same contribution percentage before and after the raise; it does not apply contribution limits, catch-up rules or employer matching. Do not enter Roth contributions or HSA deductions in this field.
Example: on $60,000 plus a 3% raise, a single filer with no state tax and a 5% traditional 401(k) contribution has a $1,800 gross increase. Additional retirement saving is $90; estimated additional federal tax is $205.20 and employee FICA is $137.70. Cash increase = $1,800 − $90 − $205.20 − $137.70 = $1,367.10. Retirement saving is part of compensation, but it is not spendable cash in the paycheck.
Social Security, Medicare and state tax
Employee Social Security uses a 6.2% rate up to the 2026 wage base of $184,500. Medicare uses 1.45% with no wage cap. The model includes 0.9% Additional Medicare Tax above $200,000 for single/head of household and $250,000 for married filing jointly. Employer withholding starts above $200,000 per employee regardless of filing status; annual liability and withholding may therefore differ. See the IRS explanation.
State calculations are rough comparisons using selected flat rates applied to gross wages. They do not model state deductions, exemptions, thresholds, local taxes or differences in the treatment of retirement contributions. Graduated states are excluded. A zero state estimate does not mean you owe no state or local tax. This tool is not suitable for determining tax payments or filing a return.
Inflation and multi-year projections
Real raise % = ((1 + raise/100) / (1 + inflation/100) − 1) × 100. Subtracting inflation from the raise is only an approximation. The initial inflation value is historical CPI-U, not a prediction. Match the inflation period to the period since your last raise when making a comparison.
The projection calculator assumes an identical percentage increase at the start of each projected year. Year n salary = starting salary × (1 + raise/100)ⁿ. Cumulative extra pay adds each projected year's difference from the unchanged starting salary; it is gross earnings, not investment growth or a discounted present value.
Rounding, limits and exclusions
Calculations retain precision internally and display currency rounded to cents. Rounded hourly figures can therefore differ slightly from annual figures calculated from unrounded rates. Actual payroll may round the hourly rate first. No overtime premium, bonus, commission, unpaid leave, mid-year start date, benefit cliff, tax credit phase-out or second household income is modeled automatically.
Current pay must be positive; new pay cannot be negative; hourly calculations require positive working hours. Inflation must exceed −100%. A pay cut down to zero is allowed. If inputs are invalid, use the on-screen error instead of any previous result.
Sources and corrections
Tax sources are linked above. Inflation comes from the Bureau of Labor Statistics. Salary survey figures are sourced separately in the salary budget guide. See our editorial policy and contact page to report an error with the inputs and expected result. Do not send a real pay stub, tax return or Social Security number.