If you find that there has been an error in a previous tax year to an employees pay, you must correct the effected pay run. This ensures the correct PAYE and NI deductions opposed to trying to account for it in the current pay period.
This also includes any recalculation of figures due to a change of dates. For example, statutory maternity pay (SMP).
Once the correction has been made in Sage Payroll, you must notify HMRC of the new figures. This is done by sending a Supplementary FPS.
You need to notify HMRC if the changes relate to information normally included in an Employer payment summery (EPS) submission. You don’t process this through Sage Payroll.
Edit the pay period that contains the incorrect figures. For more information, read Amend a completed pay run.
You need to inform HMRC of the corrected figures. This is done by sending a supplementary FPS. For more information, read Supplementary FPS.
A supplementary FPS doesn’t include the following information:
An EPS includes this information, rather than an FPS. You can't submit a supplementary EPS in Sage Payroll. Instead, use the HMRC's basic tools. For more information, read their Basic PAYE tools user guide at gov.uk.