I found the place: go to your listing, click on regulations, click on income tax, on that page it says where to enter your Mass Registrtaion number. BUT! I have not succeeded and Airbnb support has dead-ended.
I’m working on this....I have my Mass Tax Connect registration number for room occupancy, I see on the Mass Tax Connect site where each month since July 1 awaits filing and payment. I have confirmed with Airbnb which bookings .theyve collected tax from guests. BUT BUT....there is a glitch in the programming on Airbnb’s site where I’m supposed to enter my ROC (room occupancy consolidated) number. Contact with Airbnb has achieved nothing.