Larry, I'm not counting on Airbnb to find a solution soon. Hawaii's GET/TAT is too complicated for them to get involved. And, the liability must be huge. Meantime, we Hosts (many of us) are duplicating the taxes we pay under GET/TAT. The way I read it, that's unnecessary.
There is a way for you to minimize your GET/TAT to only what is required. It is outlined in the "Visible Disclosure", Section 11. of "An Introduction to the Transient AccomodationTax", April 2016. Issued by the Tax Department.
According to that guideline, if you (a) vissibly disclose the tax as included in the rent paid to you by Airbnb and (b) disclose the calculation to your tenant as the tax included in the rent he paid you, you may use the net amount as "Gross Income".
Problem for most of us is that from the amount paid by Airbnb, we must work backwards to figure out the Gross Income amount. So, to back out and determine the Gross Income from the payment,
I use this formula: Gross Rental Income = Payment Received from Airbnb / (1+(.0925+.0450)); where the .0925 is the TAT and the .0450 is the Honolulu GET. When I have Gross Rental Income solved, I then multiply it by 4.5% and 9.25% to determine the amount of TAT and GET due to the State Tax Collector. It results in paying less GET and TAT than you would pay by multiplying each tax rate by the amount you got from Airbnb. The results can then be used to report to the State Tax Collector.
As an extra precaution, my Airbnb listing (first line) shows "rate includes payment of Hawaii State Taxes" and I post my tax license number.
Now, I am not a tax expert and I know only high school algebra, so I offer this as a solution hoping that someone will review it for free and tell me this method will keep me safe from jail.
Give me feedback if you want to walk through this.
Good luck,
Dean