How the calculator converts salary to take-home pay
The calculation works annually and then divides. Whatever you enter is first turned into an annual gross figure. In annual mode that is the number itself. In hourly mode, the hourly rate is multiplied by hours per week and then by 52 weeks, so 30 per hour at 40 hours a week becomes 62,400 a year. That annual gross is run through the tax engine for the selected country, and the resulting annual net is divided by the number of pay periods.
Pay frequency controls only the divisor: 52 for weekly, 26 for biweekly, and 12 for monthly. It has no effect on total tax for the year, because the engine works on annual income. This is deliberate. Changing how often you are paid does not change what you owe, and a calculator that produced different annual totals for different frequencies would be wrong.
The tool covers six countries: the United States, the United Kingdom, Canada, Australia, Germany, and South Korea. Each one uses its own progressive bracket engine rather than a flat rate. That matters more than it sounds, because multiplying gross pay by a top marginal rate overstates tax badly, particularly at lower incomes where most income sits in the lowest brackets.
A worked example: 60,000 a year, biweekly, United States
Gross per paycheck is 60,000 divided by 26, or 2,307.69. Now the annual tax. The US path applies the IRS tax year 2026 single-filer figures. Taxable income is 60,000 minus the 16,100 standard deduction, or 43,900. The first 12,400 is taxed at 10 percent, giving 1,240, and the remaining 31,500 falls in the 12 percent bracket, giving 3,780. Federal income tax is 5,020.
Social contributions are the FICA employee shares: Social Security at 6.2 percent of 60,000, or 3,720, and Medicare at 1.45 percent, or 870. Total social contributions are 4,590. Annual deductions are 5,020 plus 4,590, or 9,610, so annual net is 50,390 and the effective rate is about 16.0 percent.
Net per paycheck is 50,390 divided by 26, or 1,938.08. Comparing that against gross per paycheck of 2,307.69 shows roughly 370 per period going to federal tax and payroll contributions. Switching to monthly pay would show a net of 4,199.17 across 12 periods, the same annual figure sliced differently.
What each country's figure assumes about where you live
Tax within a country often depends on the sub-national jurisdiction, so each country path makes a stated assumption. The United States figure is federal income tax and FICA only, with no state or local income tax included. In a state with no wage income tax that is close to complete; in a high-rate state it will overstate your take-home noticeably.
Canada uses Ontario rates for the provincial portion. The United Kingdom uses the England, Wales, and Northern Ireland rates, which differ from Scottish income tax rates and bands. Germany assumes tax class I with no church tax, so a married filer in class III or someone paying Kirchensteuer will see a different number in reality.
Australia and South Korea are calculated without a sub-national income tax split, following their national structures. Each country module states its own tax year, shown in the result along with a link to the official source, and those tax years are not necessarily all the same. Check the displayed year before comparing two countries side by side.
Hourly mode and the 52-week assumption
Hourly mode multiplies by exactly 52 weeks. That means the annual figure assumes you work your stated hours every week of the year, including any weeks you take off. If your time off is paid, this is accurate. If you are paid only for hours worked and you take two unpaid weeks, the real annual gross is closer to 50 weeks of pay, and you should either enter 50 weeks worth of income in annual mode or accept that the estimate runs high.
Overtime is not modeled. Entering an average hours-per-week figure that includes overtime hours at the base rate will understate gross pay, because overtime is usually paid at a premium. If overtime is a large and regular part of your income, estimate your realistic annual gross and use annual mode instead.
The tool also treats income as level across the year. Seasonal work, commission that lands in a few months, and annual bonuses all produce paychecks that vary, and progressive tax is calculated on the annual total regardless of how unevenly it arrives. The per-paycheck figure shown is an average, not a prediction of any specific paycheck.
Deductions this calculator leaves out
Take-home pay in practice is reduced by more than income tax and statutory social contributions. Health insurance premiums, retirement plan contributions, union dues, life and disability insurance, transit benefits, wage garnishments, and repayment plans such as UK student loan deductions all come out of a real payslip and none of them appear here.
Pre-tax deductions have a second effect the tool does not model: they reduce the income the tax is calculated on. A traditional retirement contribution in the US, or salary sacrifice in Australia or the UK, lowers taxable income, so the true tax is lower than an estimate built on unadjusted gross. The net pay figure will be closer than the tax figure in those cases, because the two errors partly cancel.
Because of this, treat the output as an upper bound on take-home pay from statutory deductions alone. If your payslip shows meaningfully less, the difference is usually benefits and voluntary deductions rather than a tax error.