@John47, I'm also on the Cape and received my first 2019 Instant booking today for August. My rate doesn't include the tax. Falmouth's tax is 12.45% of which 2.75% is for the Clean Water Fund. I understand that the local rate is subject to change.
Does it make sense to inform guests that a 12.45% rooms tax will be collected from them after July 1 by adding a line to my House Rules, and note the tax amount is subject to change? Does the tax apply to someone who books after Jan. 1 and visits before July 1?
I read that if Airbnb doesn't collect the tax, hosts can do so by changing the reservation afterward or sending a special offer with the additional tax included. Not ideal but better than trying to collect it upon check-in. Any suggestions appreciated.