Retroactive Pay Calculator
Enter the old and new pay per period and periods owed to get the back pay.
Result
How to use
- Enter your values in the fields above.
- Press Calculate to see your result instantly.
- Use the Share button to copy a link to your result.
About this calculator
Retroactive pay ("back pay") is the difference owed to an employee when a raise, promotion, or new contract rate is applied later than the date it actually took effect. It's calculated simply as the per-period pay difference (new rate minus old rate) multiplied by the number of pay periods that were shorted — for example, a $200/month raise that took three payroll cycles to process owes $600 in retro pay.
Payroll and HR departments run this calculation constantly after union contract ratifications (which are often retroactive to the contract's start date), government pay-scale adjustments, and delayed performance-review raises, since labor law in most jurisdictions requires the shortfall to be paid out rather than absorbed going forward.
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