New customers switch their payrolls to our system at all times of the year but there is always a peak at the start of a new tax year. This is because payroll works one tax year at a time, accumulating information as the tax year goes on and then resetting it for the start of the next.
When someone starts their first job, they normally don’t have a P45 with their tax code on it. The new employer needs another way to decide which tax code and student loan deductions to apply. HMRC publishes a form for this purpose, but using it can trigger as many questions as answers.