Hi @Marion162
If you go to the receipt you will see the details and also there is note on the bottom says:
"Airbnb charges a fee from the reservation amount for use of the Airbnb online platform. Additionally, Airbnb may take a 3% foreign exchange fee. We include the foreign exchange fee in our service fees. As a result, the services fees on your VAT invoice may be different than the service fees you see on your reservation itinerary. The reservation amount is paid by the Guest through Airbnb to the Host."
So I think this is why it is more than 12% because there are other additional fees included there.
Good luck.