Hi @johanna.simon,

Here you can find the answers to your questions:

1. We are in Germany and have the DATEV<>Personio integration. One of our employees has negotiated a retroactive salary increase starting from May. We agreed to pay him the differences of each month with this month’s payroll. I have edited his base salary since May in his profile, but how can I make the differences for each month to appear in the export for this month’s payroll? And if this is not possible, how can I make manual corrections?
   In order to payout the difference you can create an One time compensation under Settings > Additional Compensations and name it e.g "Additional payment". Afterwards you have to map the compensation for DATEV under Settings > DATEV Integrations > Salaries > One time compensation where you can set a compensation ID. You can get the ID from the tax office. Afterwards you can put in the payment sum under Profile  > Salary > One time compensation.
2. Another situation we have is an employee going on an unpaid leave. As far as I understand, the unpaid leave category in “Absences” does not have any effect on the salaries. So how can I decrease the salary for this employee during this unpaid leave?
   In order to prorate the salary during leave periods you have to go to the Employee profile > 3-dots > Schedule leave. The absence alone doesn't prorate the salary. A leave period is essential for salary proration. For more information about this topic, you can visit our Help Center article: Schedule a long-term leave period for an employee.
3. Lastly, we have an employee who started working on 22nd of July. His base salary is 6667€ and he worked for 10 days in that month. Therefore, his gross salary should be 2150,65€ (6667/31 = 215,06 * 10 = 2150,64€), but Personio has calculated 2222,33€. I communicated this to our payroll provider and they have manually adjusted the value to the correct amount in LODAS (DATEV software used for payroll accountancy) so his payslip is correct, but we would like to have the correct amount also in his salary tab. How can I fix this?
   When you have a new hire in the middle of the month (with 31 days), the following formula is applied if 30 days are set for pro-rata calculation:
   c(31 days in the month- xy days in the month where the employee wasn't hired)/30] *sum of new salary
   f(31 days in the month- 21 days/30] *6667€ = 2222,33€

This is not an error in the calculation basis, but rather one of several bases used for salary calculation in Germany. In this case, 30 days are used to represent the fractions in the day-to-day calculation. Personio offers the two common methods of proportional salary calculation in Germany, those based on 30 days and those based on the days of the month. You can select these options under Settings > Payroll & Accounting > Proportional Salary Calculation. More information on this topic can be found in our Help Center article Proportional Salary Calculation. Please note that any changes will apply retroactively.

I hope this helps Johanna! If you need further support, please let me know! 

Wishing you a lovely day ahead! 

Best,

Zulema