Per Diems
What you need to know in a nutshell:
Per Diems
Per Diems are fixed lump sums that Smart can reimburse as an employer without invoices.
Regular additional expenses
The reimbursement of travel expenses can also be used to claim the legally regulated additional expenses for meals (Per Diems). These are lump sums for business-related travel. For an absence of at least 24 hours within Germany, the rate is 28 euros, and 14 euros for the day of arrival and departure. The rates are reduced if meals were included as part of the overnight stay.
For trips abroad, different rates apply depending on the destination, which can be found here. LINK FEHLT AUCH IN DE