There are multiple definitions - click on the translation that matches your context.

Aufschlag

Substantiv

full

premium

noun

Comparative law notes

this English term also has the meaning of a little extra charge or levy in exchange for a good or service of additional value.

Definitions of premium

the amount paid by the policyholder (=the purchaser of an insurance policy) to the insurer (=the party who provides insurance) for the insurance policy

In order for the insurance policy to enter into force, the premium must be paid by the due date.