Point of origin:
You are running a server under the "Value Active M" tariff.
You want to:
continue running the server under the "Value Active L" tariff because it includes more traffic for instance.
Following costs arise after a tariff upgrade:
None, since the server hardware stays the same and no changes have to be made on the server.
Costs arise according to the new tariff (in the abovementioned example: "Value Active L")