How to Calculate Overtime Backpay Owed
October 23, 2026
Calculating overtime backpay owed means recalculating what should have been paid for past overtime hours (using the correct regular rate and 1.5× multiplier) and subtracting what was actually paid, for each affected workweek individually.
Skip the math and get your answer instantly:
Open the Overtime Calculator →Worked Example
An employee worked 45 hours in a specific past week at a $22/hour regular rate, but was only paid straight-time for all 45 hours (no overtime premium applied).
- What should have been paid: (40 × $22) + (5 × $33) = $880 + $165 = $1,045
- What was actually paid: 45 × $22 = $990
- Backpay owed for this week: $1,045 − $990 = $55
Why Each Affected Week Needs Its Own Calculation
If backpay is owed across multiple weeks, each week needs its own correct-vs-actual comparison (since overtime is calculated per workweek, not combined) — summing the individual weekly shortfalls gives the total backpay owed, rather than trying to calculate one blended figure across all affected weeks at once.
Frequently Asked Questions
How is overtime backpay calculated?
By recalculating what should have been paid for the affected period (with correct overtime premiums) and subtracting what was actually paid, per workweek.
What's the backpay owed in this example?
$55, the difference between the correctly calculated $1,045 and the $990 actually paid.
Should backpay be calculated across multiple weeks combined?
No — each affected workweek needs its own calculation, then the individual shortfalls are summed for the total owed.
What figures are needed to calculate backpay accurately?
The correct regular rate, actual hours worked per week, and what was actually paid for comparison.