Retro pay is a one-time catch-up payment added to your payslip.
It shows up when something that affects your pay, such as a backdated salary adjustment, a correction to your hours, or an HR-approved fix, is finalized after the payroll cutoff for that period. Rather than reissuing the earlier payslip, Outstaffer adds the difference once, as a retro pay line, on your next payslip.
Retro pay corrects an earlier period. It is not an error on the payslip it appears on. Once paid, your regular pay continues as normal at your current rate.
If a retro pay amount looks wrong, raise a platform ticket to your HR contact with the payslip and dates in question.