Back Pay Calculator
Add up unpaid hours, missed overtime, and rate shortfalls across pay periods to see the gross back pay you are owed and your estimated take-home.
Back Pay Calculator
Your Correct Pay
Leave this equal to your correct rate if the rate was right and only the hours were missing.
Unpaid Straight-Time Hours
Regular hours only. Overtime goes in the next card so it is not counted twice.
Unpaid Overtime
If your employer paid those hours but at your normal rate, you are still owed the premium on top, not the whole hour again.
Scope of the Claim
Federal claims usually reach back 2 years, or 3 years if the violation was willful. Some states allow longer.
Available in a private lawsuit or DOL court action. Since June 2025 the DOL does not seek it in pre-lawsuit investigations.
Tax Estimate
Enter your state's effective income tax rate. The nine no-income-tax states use 0%. Typical effective rates run 3 to 5 percent.
Used only to check whether you have already hit the Social Security wage base for the year.
Where the back pay comes from
Withholding breakdown
With liquidated damages
Liquidated damages are not wages. They carry no Social Security or Medicare and are usually reported on Form 1099-MISC, so the take-home estimate above covers the back wages only.
Estimates only. This is not tax, legal, or wage-claim advice. The take-home figure uses a simplified supplemental-wage model: the flat 22% federal supplemental withholding rate (37% above $1,000,000), Social Security at 6.2% up to the 2026 wage base of $184,500, Medicare at 1.45%, Additional Medicare at 0.9% above your filing status threshold, and the state rate you enter. It does not run federal tax brackets, your standard deduction, your W-4, or any pre-tax deductions, so your employer's actual withholding will differ. The overtime premium is calculated on the correct rate you enter and is not re-derived from a corrected FLSA regular rate. Liquidated damages, when shown, are excluded from the take-home estimate because they are generally not wages. Your actual tax bill is settled when you file. For a claim you intend to pursue, talk to your state labor agency, the federal Wage and Hour Division, or an employment attorney.
Keep your own shift records with ClockWage44
Claims are far easier to prove when the shifts were logged as they happened. ClockWage44's Hours Tracker records every shift across as many jobs as you work and resolves federal tax, state tax, FICA, overtime rules, and deductions into a take-home figure on-device, so you have your own figure to check the paycheck against.
The three ways an employer ends up owing you back pay
Back pay almost always traces to one of three things: hours that were worked but never paid, a rate that was lower than the rate you had actually earned, or overtime that was skipped or shorted. A single pay period can contain all three at once. That is why the calculator above keeps them on separate lines.
The three pieces are calculated on different bases, and that is the part people get wrong. Missing hours are valued at your full correct rate, because nothing at all was paid for them. A rate shortfall is the per-hour gap multiplied only by the hours that were actually paid. Overtime is either the full overtime rate or just the premium portion, depending on what your employer already handed over.
The common mistake is double-counting. If you apply the rate shortfall to every hour you worked, including the hours that were never paid, you charge those hours twice: once at the full correct rate and again for the gap. This tool multiplies the shortfall by paid hours only, so the two lines never overlap.
Everything you enter is read as a per-pay-period figure, then multiplied by the number of periods affected. If you already have grand totals in hand, set pay periods to 1 and enter the totals directly.
Straight time versus not paid at all: the overtime split that changes your number
Say your correct rate is $22 and you worked five overtime hours in a week. If your employer paid those hours at $22 instead of $33, you already have the straight-time portion in your pocket. What is missing is the half-time premium: $11 per hour, or $55. If those five hours produced no pay whatsoever, you are owed the whole overtime rate, $33 per hour, or $165. Same five hours, three times the difference.
The Wage and Hour Division computes back wages the first way for employees paid a constant hourly rate who already received straight-time pay, using one-half the regular rate (DOL Fact Sheet #23 and the WH-134 coefficient table). Most back pay calculators online assume the 1.5x case and quietly triple the claim for the more common violation.
If your whole dispute is overtime rather than missing hours, the Overtime Calculator works the full week, and the Time and a Half Calculator isolates the 1.5x math on its own.
How far back your claim reaches, and when it doubles
Under the FLSA the standard window is two years from the violation, stretched to three years when the violation was willful. Willful means the employer knew the conduct broke the law or showed reckless disregard for whether it did, which is a higher bar than simple carelessness.
State law can run longer, and where it does, the longer window is the one that matters to you. California allows three years for most wage claims and up to four under its unfair competition statute, and New York allows six. Check your state before you assume the federal two-year figure applies.
Then there is the doubling. The FLSA lets a worker recover the unpaid wages plus an equal amount as liquidated damages, on the theory that being paid late is itself a loss. One thing changed on June 27, 2025: the Wage and Hour Division stopped seeking liquidated damages in administrative investigations and settlements. They are still available in a private lawsuit or in litigation the Department of Labor files in court. Tick the checkbox above to see the doubled claim value alongside the back wages.
What back pay looks like after tax
Back pay is wages, and it is taxed in the year you receive it rather than the year you earned it. Because it usually lands as a lump sum outside your normal payroll cycle, employers commonly withhold federal income tax at the flat 22% supplemental rate instead of running your W-4, plus 6.2% Social Security and 1.45% Medicare. That is roughly 29.65% before state tax even enters the picture, which is why a settlement can feel over-withheld the moment it arrives.
The withholding is not your final tax bill. Your real federal tax gets settled at filing against your full-year income, so if your effective rate for the year lands under 22%, the difference comes back. Liquidated damages sit outside all of this: they are generally not wages, carry no FICA, and are usually reported on Form 1099-MISC, so the take-home line above covers back wages only.
All of this rests on knowing what you actually worked. If you are rebuilding hours from schedules, badge logs, or memory, the Timesheet Calculator turns shift times into weekly totals you can feed into the top of this page, and the Final Paycheck Calculator covers what you are owed when the job has already ended. Going forward, the fix is your own record: download ClockWage44 and log each shift as it happens, so the next time a paycheck looks short you have a number to hold it against.
Frequently Asked Questions
Common questions about back pay calculator
How do I calculate back pay owed to me?
Start with the hours. Subtract the hours you were paid for from the hours you actually worked, then multiply the gap by your correct hourly rate. If you were paid for the hours but at too low a rate, multiply the per-hour shortfall by the hours that were paid. If overtime was involved, add the overtime piece separately. Add those three parts together and you have your gross back pay. Do the math per pay period, then multiply by the number of periods affected.
What is the difference between back pay and retro pay?
Back pay is money for work that was never paid at all, like ten hours that fell off a timesheet. Retro pay is a correction to a rate that was applied too late, like a raise from $15 to $18 that took effect three weeks after it should have. Plenty of claims contain both, which is why this calculator has separate lines for unpaid hours and for a rate shortfall.
How far back can I claim unpaid wages?
Under the federal Fair Labor Standards Act the window is two years from the violation, extended to three years if the employer's violation was willful, meaning the employer knew the conduct broke the law or showed reckless disregard for whether it did. State law can run longer. California allows three years for most wage claims and up to four under its unfair competition law, and New York allows six. The longer of the two applies to your situation, so check your state before assuming two years.
My employer paid my overtime hours at my normal rate. What am I owed?
The premium, not the whole hour again. If your rate is $22 and you worked five overtime hours that were paid at $22 instead of $33, you already received the straight-time portion. What is missing is the half-time premium, $11 per hour, or $55. The Wage and Hour Division computes back wages this way for employees paid a constant hourly rate. Choose 'Paid at straight time' above to get this result, and choose 'Not paid at all' only if those hours produced no pay whatsoever. For the underlying premium math, see the Overtime Calculator and the Time and a Half Calculator.
What are liquidated damages in a wage claim?
The FLSA lets a worker recover the unpaid wages plus an equal amount as liquidated damages, which effectively doubles the recovery. It compensates for the delay in being paid. One caveat: since June 27, 2025, the Wage and Hour Division no longer seeks liquidated damages during administrative investigations and settlements. They remain available in a private lawsuit or in litigation the Department of Labor files in court.
Is back pay taxed?
Yes. Back pay is wages, and it is taxed in the year you receive it, not the year you earned it. Because it usually arrives as a lump sum, employers often withhold federal income tax using the flat supplemental rate of 22% rather than your normal W-4 calculation, plus Social Security at 6.2% and Medicare at 1.45%. Liquidated damages are treated differently. They are generally not wages, carry no Social Security or Medicare, and are reported on Form 1099-MISC.
What if I do not have records of the hours I worked?
Your recollection still counts. When an employer fails to keep accurate time records, courts allow a worker to establish the hours worked by a reasonable estimate, and the burden shifts to the employer to rebut it. Anything contemporaneous helps: text messages, schedules, door badge logs, delivery timestamps, or your own log. Rebuilding those shifts into weekly totals is what the Timesheet Calculator is for. And if you start keeping your own log now, a future claim gets a lot easier to prove.
How do I file a claim for unpaid wages?
You have a few routes. File a complaint with the federal Wage and Hour Division, file with your state labor agency, or bring a private lawsuit. The Department of Labor can supervise payment of back wages or sue on your behalf, and the Secretary of Labor can seek an injunction against continued violations. Filing a private suit is generally not possible once the Department has filed suit or a supervised payment has been made for the same wages, so pick a lane before the clock runs out. If the wages are tied to a job that already ended, the Final Paycheck Calculator covers the separation side of what you are owed.