Overtime pay, explained: time-and-a-half, double time and the tax question

I have checked more overtime payslips than I can count, and the mistakes cluster in the same three places: the wrong hours counted, the wrong rate applied, and a tax question that starts with a rumour — that overtime is taxed at some special punitive rate. It is not. Here is the overtime math done properly, two paychecks worked end to end, and then the tax question answered with what the IRS actually does, including the temporary deduction that runs from 2025 through 2028.

The rule, in one paragraph

The Fair Labor Standards Act (FLSA) requires employers to pay non-exempt employees at least one-and-a-half times their regular rate for every hour worked beyond 40 in a single workweek. Three parts of that sentence do the heavy lifting. “Non-exempt” means the rule covers most hourly workers and many salaried ones below the exemption thresholds. “Regular rate” means your actual hourly earnings rate — including most shift differentials and non-discretionary bonuses — not always the base rate on your offer letter. And “workweek” means one fixed, recurring 168-hour period: federal law has no daily overtime rule and no weekend premium, though where a state law or an employer policy pays you more, the standard that pays more is the one that counts.

Worked example 1: a 50-hour week at $20 an hour

The premium inside this paycheck — the “half” above the regular rate on the 10 overtime hours — is 10 × $10.00 = $100.00. Remember that figure; it matters for the tax section below.

Notice what did not happen: the first 40 hours were not re-rated, and nothing about the calculation needed the pay period, the month, or last week’s hours. One week, one count, one premium.

Worked example 2: why hours cannot be averaged across weeks

Now a two-week stretch at $18.50 an hour — a quiet week of 40 hours, then a busy week of 48:

The overtime rate is 1.5 × $18.50 = $27.75; the premium slice in week 2 is 8 × $9.25 = $74.00.

The tempting shortcut — 88 hours over two weeks averages 44 a week, so surely only 8 hours are overtime either way? — lands on the same total here by luck, but try it with a 32-hour week followed by a 48-hour week and averaging steals four overtime hours outright. The FLSA counts each workweek on its own, and private employers generally cannot average hours across a pay period to dilute a premium. This is also why overtime appears and disappears between paychecks that feel identical.

Double time: real, but rarely required

Double time — twice the regular rate — is not required by federal law at any hour count. Where it exists, it comes from an employer policy, a union agreement, or a state rule (California’s daily-overtime law is the well-known example). I treat double time as a genuine perk worth valuing when comparing jobs, but I never build it into a pay projection until I have seen it in writing. And as the tax section shows, even when double time is paid, only the FLSA’s time-and-a-half premium counts as “qualified” overtime for the federal deduction.

First, count the hours honestly

Before any premium exists, somebody has to turn clock times into numbers. A payroll hours calculator does that unglamorous job: it converts minutes into decimal hours — 15 minutes is 0.25, 30 minutes is 0.50, 45 minutes is 0.75 — and totals them by the workweek. Five shifts of 7 hours 45 minutes are 7.75 × 5 = 38.75 hours: a full-looking week with no overtime in it at all. Sloppy time rounding at this stage is where small, weekly pay losses hide, so it is worth ten seconds of your own arithmetic before you question the premium.

The tax question: overtime and your tax bill

People go looking for an overtime tax calculator because a heavy overtime week seems to be taxed into the ground. Here is the accurate picture. Overtime pay is taxed as ordinary income — the same federal brackets, the same Social Security and Medicare rates as your regular wages. There is no overtime tax rate. What creates the illusion is withholding: payroll systems annualise each paycheck, so a $1,100 week is withheld as if you earned at that pace all year, which overstates the withholding for a one-off busy week. The excess comes back when you file, because your actual tax is figured on your actual annual income.

One genuine exception exists right now. For tax years 2025 through 2028, a federal deduction lets you deduct the premium slice of FLSA-required overtime — the “half” in time-and-a-half — up to $12,500 for single filers or $25,000 on a joint return, phasing out once modified adjusted gross income passes $150,000 ($300,000 joint). On example 1 above, the deductible slice is the $100.00 premium, not the $300.00 of overtime pay and certainly not the whole $1,100. Three limits worth knowing: the deduction is claimed when you file, so it does not change any paycheck’s withholding; it covers only the federal income tax, leaving Social Security and Medicare untouched; and overtime paid purely by employer policy or state law, above what the FLSA requires, does not qualify. To see what a given week’s hours pay before tax enters the picture, run the hours and rate through our pay calculator.

Sources: overtime rules, U.S. Department of Labor guidance on the Fair Labor Standards Act (29 CFR Part 778 for the regular rate); overtime deduction for tax years 2025–2028, IRS guidance on the One Big Beautiful Bill Act provisions (deduction claimed on Schedule 1-A). Pay figures computed for this article.