Methodology

A transparent look at the formulas, data sources, and validation processes behind every Salario calculator.

1. Salary Conversion Methods

Our Salary Calculator, Hourly to Salary, and Salary to Hourly converters use standardized pay period assumptions:

Annual Salary = Hourly Rate x Hours/Week x Weeks/Year

Standard: 40 hours/week x 52 weeks = 2,080 hours/year

Monthly = Annual / 12

Biweekly = Annual / 26

Weekly = Annual / 52

Daily = Annual / 260 (52 weeks x 5 days)

Users can customize hours per week and weeks per year to reflect part-time schedules, unpaid time off, or alternative work arrangements. The calculator adjusts all derived figures accordingly.

2. Tax Withholding Algorithms

The Net Pay Calculator and Paycheck Calculator implement the IRS percentage method for income tax withholding, as specified in IRS Publication 15-T:

Adjusted Annual Wage = (Gross Pay x Pay Periods) - Standard Deduction

Federal Tax = Sum of (Taxable Amount in Bracket x Bracket Rate)

2026 Federal Brackets (Single):

10% on income up to $11,925

12% on $11,926 - $48,475

22% on $48,476 - $103,350

24% on $103,351 - $197,300

32% on $197,301 - $250,525

35% on $250,526 - $626,350

37% on income over $626,350

State income tax calculations follow each state's specific bracket structure. States with flat taxes (e.g., Colorado at 4.4%) apply a single rate. States with no income tax (e.g., Texas, Florida) return zero state withholding. Our State Tax Calculator covers all 50 states and DC.

3. FICA and Payroll Taxes

Federal Insurance Contributions Act (FICA) taxes are calculated as follows:

Social Security = 6.2% x Gross Pay (up to wage base of $176,100 for 2026)

Medicare = 1.45% x Gross Pay

Additional Medicare = 0.9% x (Gross Pay - $200,000) [when applicable]

Total FICA = Social Security + Medicare + Additional Medicare

The Social Security wage base is updated annually. When an employee's cumulative earnings exceed the wage base, Social Security withholding stops for the remainder of the year while Medicare continues uncapped.

4. Cost of Living Methodology

Our Cost of Living Calculator uses composite cost indices derived from BLS Consumer Price Index data and Census Bureau American Community Survey data:

Equivalent Salary = Current Salary x (Target City Index / Current City Index)

Cost Difference = ((Target Index - Current Index) / Current Index) x 100%

Indices incorporate housing costs (weighted ~30%), food (~15%), transportation (~15%), healthcare (~10%), utilities (~10%), and other expenses (~20%). These weights reflect the BLS Consumer Expenditure Survey national averages.

5. Overtime Calculations (FLSA)

The Overtime Pay Calculator follows the Fair Labor Standards Act (FLSA) requirements:

Regular Pay = Hourly Rate x 40 hours

Overtime Rate = Hourly Rate x 1.5 (time-and-a-half)

Double Time Rate = Hourly Rate x 2.0 (where applicable by state law)

Total Pay = Regular Pay + (Overtime Hours x Overtime Rate)

The FLSA mandates 1.5x pay for hours exceeding 40 in a workweek for non-exempt employees. Some states (e.g., California) require daily overtime after 8 hours and double time after 12 hours. Our calculator accounts for these state-specific rules.

6. Data Sources

All Salario calculators draw from the following authoritative sources:

Bureau of Labor Statistics (BLS) — Occupational Employment and Wage Statistics (OEWS), Consumer Price Index (CPI), Consumer Expenditure Survey. Updated annually.
Internal Revenue Service (IRS) — Publication 15-T (Federal Income Tax Withholding), Revenue Procedures for annual inflation adjustments, FICA wage base announcements.
U.S. Census Bureau — American Community Survey (ACS) for income distribution and regional economic data.
State tax departments — Official state income tax rate schedules from all 50 states and the District of Columbia.
Department of Labor — FLSA overtime rules and minimum wage regulations.

7. Validation Process

Every calculator undergoes a multi-step validation process before publication:

Unit testing — Individual functions are tested with known input-output pairs derived from official IRS examples and BLS reference data.
Cross-validation — Results are compared against established payroll software outputs and IRS withholding tables for at least 10 different income levels.
Boundary testing — Calculations are verified at bracket boundaries, wage base limits, and extreme values (minimum wage through $1M+ incomes).
Annual review — When new tax year data is published, all affected calculators are updated and re-validated within 30 days of the official release.

8. Limitations

While we strive for maximum accuracy, users should be aware of these limitations:

Estimates, not exact figures — Calculators provide estimates based on standard assumptions. Your actual pay may differ based on employer-specific policies, pre-tax deductions, benefits, and local taxes.
Federal and state taxes only — Local income taxes (city, county) are not included in all calculators. Cities like New York City and Philadelphia have significant local taxes that are not reflected in basic calculations.
Standard deduction assumed — Tax calculators generally assume the standard deduction. If you itemize deductions, your actual tax liability may differ.
Not a substitute for professional advice — Salario calculators are informational tools. For tax filing, payroll decisions, or compensation negotiations, consult a qualified tax professional or financial advisor.

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