The gap between a salary and what it pays
An annual salary is a headline, not a measurement. Turning it into something comparable means answering three separate questions, and the tools here handle them one at a time.
How much arrives? Gross pay passes through pre-tax deductions, federal income tax, Social Security and Medicare, and whatever your state and locality levy, in that order and on different bases. Retirement contributions reduce income tax but not payroll tax; a health premium usually reduces both. The order matters, and it is why two people with the same salary can take home noticeably different amounts.
How many hours does it really take? Contracted hours are a floor. Unpaid overtime, commuting and preparation all consume time the job requires but does not pay for, and they do not appear in any offer letter. Dividing pay by contracted hours flatters almost every salaried role.
What does the job cost you? Commuting, parking, clothing, equipment and meals bought because you were not at home are real expenses attributable to the job. Netting them out changes the comparison between two offers more often than people expect.
Rules, conventions and where they differ
Some of the arithmetic on these pages is fixed by federal law and some is pure convention, and it is worth knowing which is which.
The 40-hour workweek threshold for overtime, the minimum time-and-a-half multiplier and the requirement that the overtime rate be based on the regular rate of pay -- including nondiscretionary bonuses, not just the base hourly figure -- come from the Fair Labor Standards Act. Several states add their own rules, most commonly daily overtime, and a contract can be more generous than the law but not less.
The 2,080-hour year, the 26-versus-24 pay-period distinction and typical leave accrual rates are conventions, not law. They are useful for comparison and carry no obligation. Leave accrual, carryover, caps and payout on leaving are governed by your state and by your employer's written policy, which is always the authority over any calculator.
Estimates, not payroll
The take-home figure produced here is a federal estimate for a stated tax year using the standard deduction, the published brackets and payroll tax rates, plus a flat state rate you supply. It does not model credits, itemized deductions, local taxes, supplemental withholding on bonuses, or the specifics of your W-4.
That makes it well suited to comparing two offers, testing what a larger retirement contribution does to your paycheck, or sanity-checking a stub that looks wrong. It is not suited to predicting a refund or filling in a tax return.