OK, well I don't appear to be able to insert a screenshot here, which is inconvenient. But I did as you suggested, and found that Airbnb are charging guests $85 per night, no tax, plus an "Airbnb service fee" of $24, for a total cost to the guest of $194. No "occupancy tax" this time. So I assume this means that I am responsible for deducting the 15% HST from the net payout that I receive from Airbnb. Or, should it be deducted from the $85 that the guest pays? This is where it's so confusing. I don't receive the full $85, so how can I collect and remit the HST from money that I don't even get?
When I looked back over last year's transactions, this "occupancy tax" seems to be quite random. Sometimes it was charged, sometimes not. For example, a booking in August (after I had registered for HST and informed Airbnb of my HST number) shows a booking of $150 ($75 x 2 nights) + $21.18 guest service fee, + occupancy taxes of $3.18. That's less than 3%, so it's definitely not the HST. If you read the chat transcript with the Airbnb Support person, they state that the occupancy tax IS the HST. So if Airbnb is charging an occupancy tax, and then I charge HST, that's a double tax, which is illegal.
You say "As you are responsible for the tax you surely should have seen how the payments to you over the last year compare to the listed prices." Yes, of course I can read the payout statements and do the math. But none of this really answers my questions, which are these: What is the occupancy tax? Why is it charged on some bookings and not on others? And is Airbnb remitting this to the CRA as the HST on my bookings (as stated in the chat transcript)? As Airbnb does not break out the HST portion for the guest, and there's no facility to do so on the host side either, how are we supposed to inform the guests that their per night fee includes (or does not include, in which case how are we to collect it?) a 15% HST charge?
I'm sure I'm not the only one wrestling with this.
P.S. The CRA will NOT accept the vague "payout" statement provided by Airbnb. They require a proper invoice, that breaks out the 15% HST charged to the guest, and clearly shows on what portion of the per night fee that 15% was charged.