What retro pay is, when employers owe it, how to calculate it for hourly and salaried staff, and why overtime must be recalculated.
Retroactive pay covers work that was already done and paid, but paid at the wrong amount. The employee is not being paid for new work; they are being paid the gap between the old pay and the correct pay. It is different from back pay, a broader term often used when wages were not paid at all, for example after a wage claim or an unpaid final paycheck. In everyday payroll, the two terms are sometimes used loosely, so it helps to describe exactly what the payment covers.
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Retro pay comes up in most businesses sooner or later. A manager approves a raise but it reaches payroll two weeks late. A shift differential is set up in the time system after the first night shifts have already been worked. A union contract is signed in March with new rates that apply from January. In each case, someone has to work out what each employee should have received and pay the difference.
| Situation | What happened | Who usually notices |
|---|---|---|
| Late raise | A raise was approved with an earlier effective date than the payroll change | Employee or manager |
| Wrong rate entered | A new hire or transfer was set up at the wrong hourly rate | Employee checking a pay stub |
| Missed premium | Shift differential, on-call or hazard pay was not applied | Supervisor or payroll audit |
| Missed hours | Hours were left out of a timecard, for example a missed punch | Employee |
| Contract or minimum wage change | A new agreement or legal minimum applies from a date already passed | HR or payroll |
| Overtime miscalculated | A bonus or premium was left out of the regular rate | Payroll review or audit |
Most of these are process problems, not calculation problems. The fix is usually a clear rule about when pay changes take effect and who updates the system. Our guide on the regular rate of pay explains why bonuses and premiums affect overtime.
For an hourly, non-exempt employee, work period by period. Do not just multiply the total hours by the rate difference, because overtime hours are paid at a higher multiple.
Worked example (fictional): Maria’s raise from $18.00 to $19.50 an hour should have started two weeks ago. In week one she worked 40 hours; in week two, 46 hours.
| Week | Hours | Paid at old rate | Should have been paid | Difference |
|---|---|---|---|---|
| 1 | 40 regular | 40 × $18.00 = $720.00 | 40 × $19.50 = $780.00 | $60.00 |
| 2 | 40 regular + 6 OT | $720.00 + 6 × $27.00 = $882.00 | $780.00 + 6 × $29.25 = $955.50 | $73.50 |
| Total | $1,602.00 | $1,735.50 | $135.00 |
If you had multiplied all 86 hours by the $1.50 difference, you would get $129.00 and underpay Maria by $4.50, because the overtime difference is $2.25 an hour, not $1.50. Small gaps like this are exactly what wage-and-hour audits find. You can check the overtime parts with our overtime calculator.
Under the Fair Labor Standards Act, when a pay increase is applied retroactively, the retroactive amount generally has to be spread back over the workweeks it covers and the overtime for those weeks recalculated. The federal overtime regulations address retroactive pay increases directly (29 CFR 778.303). In practice, this means a lump-sum “raise catch-up” that ignores past overtime may still leave the employee underpaid.
The same logic applies to other pay that should have been in the regular rate, such as a nondiscretionary bonus or a shift differential paid late. If it relates to past workweeks in which the employee worked overtime, the overtime for those weeks needs another look. See our guide to FLSA overtime rules for the basics.
For salaried employees, convert the change into a per-period amount. If an annual salary rises from $52,000 to $55,000 with an effective date three biweekly periods ago, the per-period difference is $3,000 ÷ 26 = $115.38, and the retro amount is about $346.15 before withholding. For semimonthly pay, divide by 24 instead. Our guide to pay period types covers the differences.
For salaried non-exempt employees, you also need to check the overtime hours in the affected weeks, because their overtime rate depends on their regular rate. For exempt employees, overtime does not apply under federal law, so the calculation is usually just the salary difference.
Retro pay is wages, so it is subject to the usual payroll taxes and withholding. For federal income tax withholding, check IRS Publication 15 (Circular E) or ask your payroll provider which withholding method applies to your situation.
Some states set deadlines for correcting underpayments or add penalties for late wages, especially when the employee has left. If you owe retro pay to a former employee, check your state labor law rules on final pay.
Retro pay is not always avoidable; contract settlements and legal minimum wage changes can apply to dates already passed. But most retro pay comes from avoidable delays. A few habits reduce it sharply:
EZTime records hours by workweek with regular and overtime totals, so when a rate needs to be corrected you already have the hours you need for each affected week. Approved timecards and timecard corrections leave a record of what changed and when, and attendance reports can be exported for payroll. EZTime does not run payroll itself; it gives your payroll process clean hours to start from.
Sam earns $18.00 an hour. His raise to $19.50 was approved effective March 1, but payroll did not update until the paycheck covering March 29. In the four weeks in between, Sam worked 40, 42, 38 and 45 hours.
| Week | Hours | Straight-time difference | Overtime difference | Total owed |
|---|---|---|---|---|
| 1 | 40 | 40 x $1.50 = $60.00 | None | $60.00 |
| 2 | 42 | 42 x $1.50 = $63.00 | 2 x $0.75 = $1.50 | $64.50 |
| 3 | 38 | 38 x $1.50 = $57.00 | None | $57.00 |
| 4 | 45 | 45 x $1.50 = $67.50 | 5 x $0.75 = $3.75 | $71.25 |
The overtime difference is the extra half-time on the $1.50 increase for each overtime hour. Sam is owed $252.75 in total. If the weeks also included shift differentials or non-discretionary bonuses, they belong in the regular rate as well. Our regular rate calculator and overtime calculator help you check each week.
Tick each statement that is true for your business today.
0 of 6. Retro pay errors are likely. Start with written effective dates and a single source of hours.
Not exactly. Retro pay usually corrects the rate for hours already paid. Back pay often refers to wages that were never paid at all, such as after a wage claim. The terms are sometimes used interchangeably, so describe what the payment covers.
For non-exempt employees, generally yes. A retroactive increase has to be allocated to the workweeks it covers and the overtime for those weeks recalculated.
Retro pay is wages and subject to payroll taxes. For the federal income tax withholding method, check IRS Publication 15 or your payroll provider.
As soon as practical, usually in the next regular payroll. Some states have stricter timing rules, especially for former employees.
It is good practice. A separate, labeled line shows the employee exactly what was corrected and helps if questions come up later.
An employer can set a future effective date for a new raise. But if the employee was already entitled to a rate, for example under a contract or a minimum wage law, the employer cannot remove that entitlement by changing a date.
Monthly attendance reports in EZTime are signed digitally by employees, and history is kept for up to seven years. See current plans and what each one includes on the pricing page.