Just a tip...
When capturing manual IRP5/IT3(a) certificates, complete the employee details on the left first. Then click "Save Certificate" otherwise your "Manage Source Codes" button will remain greyed out. Then you will be able to complete the source code section.
This is just something small, but I hope this helps someone. I know when I did my first PAYE recon in October last year, I felt a bit overwhelmed.
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