A workplace has changed ownership 3/4 way through a weekly pay period and they split the wages, so old boss paid 4 days, new boss paid 1 day wages for that period so it reduces the gross income for the employee on the 1 day payslip. Therefore the 1 day pay hasn't been taxed as under the threshold for taxing, but the 4 day payslip was taxed accordingly.
The new boss has now gone and added the next full weeks pay eg 5 days and the previous week's one day wages and taxed us now on the total gross wages (6 days work).
Can they tax us on a past payslip and then the new full week?
This puts us into a higher tax bracket.