If a client has moved over to you part way through the tax year, it is not possible to make / submit amendments for the periods that were not processed by yourself.

You can only submit amendments using an Additional FPS > correction to earlier submission, for pay periods that were processed on BrightPay by your organisation.

If incorrect data has been submitted prior to the client moving to you, the previous accountant / bureau will need to submit these corrections using the same software that the original FPS was sent to HMRC.