If you or your employees have a meal on a business trip subject to certain conditions, then the per diem meal allowance must be reduced, depending on whether it is breakfast, lunch or dinner.
The amount of the deduction depends on the city or country on the given day.
In Spesenfuchs you or your employee can do it easily by clicking on the corresponding icon. Research for the correct values and calculations are no longer necessary. Give your calculator a break.