The Gross Pay Trap
When people try to estimate what their paycheck will actually be after overtime and deductions, the first error is often the starting point itself. According to the owner of FigWage, a free pay and work hours calculator, many workers begin with gross pay and assume that number will land in their bank account.
"People multiply their hours by their rate, add overtime at time-and-a-half, and expect that number to land in their account," they said. "What actually lands is what's left after federal withholding, FICA, state tax — sometimes city or county tax too — and whatever deductions come out of that check."
That gap between gross and net is where most surprises originate. The second common misconception is the belief that overtime is taxed at a special, punitive rate. "Overtime isn't taxed at a special rate," they explained. "A bigger check just gets withheld as if you'd earn at that pace all year, and it settles up when you file." In other words, the larger withholding on an overtime check is a timing issue, not a permanent penalty.
What Most Calculators Leave Out
Many paycheck calculators available online stop at federal and state income tax. But that leaves out a range of local and post-tax items that can change the final deposit significantly.
"What they leave out is everything local and everything post-tax: city and county taxes (in Indiana the county rate alone changes the answer depending on where you live; New York City adds its own layer on top of the state), and deductions that come out after tax, like Roth 401(k) contributions, union dues, or garnishments," they said.
Those omissions are precisely why FigWage includes a post-tax deductions field and a per-pay-frequency breakdown. As they put it: "a per-check number that ignores them isn't the deposit."
Another frequently missed detail is the Social Security wage cap, which is $184,500 for 2026. High earners who cross that threshold partway through the year see their take-home pay jump — a change that can look like a payroll error if no one warned them. For readers who want to understand the mechanics of withholding and FICA, the IRS publishes plain-language guidance.
When the Rule of Thumb Fails
The standard advice that overtime is paid at 1.5 times "your rate" assumes a single hourly rate. But many workers earn more than one rate in the same week — for example, a standard weekday rate and a higher weekend rate.
"The premium is actually based on the weighted average of the two rates, so the shortcut overestimates the check," they said. "The person assumes payroll made a mistake, when really the rule of thumb just didn't fit their situation."
This pattern comes up repeatedly: a worker calculates overtime using the higher rate, expects a larger check, and then suspects an error when the deposit is smaller than predicted. The Fair Labor Standards Act sets the federal overtime framework, and the Department of Labor's guidance on overtime pay notes that when an employee works at different rates, the regular rate is a weighted average — not simply the highest rate.
Practical Takeaways
For anyone trying to estimate a paycheck that includes overtime, the key steps are to start from net pay rather than gross, account for local taxes and post-tax deductions, and check whether multiple pay rates apply. A calculator that includes those fields — like the ones at FigWage — can produce a more realistic per-check figure.
As the owner summarized, the goal is to close the gap between what the math suggests and what actually arrives in the account. Understanding withholding timing and the weighted-average rule can prevent a routine payroll result from being mistaken for an error.