Diagnosis
Regarding the anonymity tax in the wage tax, identifying the employeeduring the course of the year will have no effect on the wage tax rate(52%) already applied to previous payments. In principle, this field cantherefore not be changed retroactively.
Regarding national employee insurance contributions, it ispossible to alter the tax-free allowance and maximisationretroactively. However, the Special Employee Groups code cannot. Thecalculations used according to the Basic Method for Calculating Growthalways ensures that, in the current payroll period, it is automaticallyadjusted for the entire year.