Hi @Mary1371 I hope you are well!
This about guest fees from the help centre:
Guest service fees
The guest service fee for homes ranges between 0% and 20% of the booking subtotal (the nightly rate plus cleaning fee and additional guest fee, if applicable, but excluding Airbnb fees and taxes) and is calculated using a variety of factors—these include the reservation subtotal, the length of the stay, and characteristics of the listing. In general, the service fee gets lower as the reservation cost gets higher. Guests see this fee on the checkout page before they book a reservation.
If Airbnb is required to collect VAT, the service fee and VAT amounts will be combined on the checkout page, which could make the service fee appear to be higher than 20%.
Best wishes,
Paul 🙂