I am not a tax professional, nor an Airbnb configuration expert, so please take this post for what it is (my opinion).
If Airbnb is only collecting and remitting the Florida 7.5% sales tax on your rentals, then (per Airbnb) you need to add the 6% Osceola Tourist tax to your listing. After adding the 6% tax, Airbnb should:
1. Start charging guests 13.5% tax,
2. Continue submitting the Florida 7.5% sales tax on your behalf, and
3. Start collecting and sending you the Osceola 6% tourist tax to pay yourself.
See this Airbnb help page:
Under the Adding taxes to your listing section, it states:
...If you add taxes in addition to the taxes we automatically collect, we pass your additional taxes to you to remit to the tax authorities, and we remit the taxes we automatically collect directly to the tax authorities. ...
Under the How to add taxes to your listing section, it states:
..You’ll need to turn on professional hosting tools to access this feature...
..If we collect and remit taxes for your listing (default taxes)..The second way you may be able to add taxes to a listing is to add more taxes to the taxes we already collect. We’ll collect these taxes in addition to the taxes we automatically collect on your behalf.
So, to have Airbnb charge your guests 13.5% tax, send 7.5% to Florida on your behalf, and send you the 6% Osceola county tax, you must:
1. Enable Airbnb Professional Hosting Tools on your listing. See this link on how to do that: https://www.airbnb.com/help/article/2499/
2. Go to your Listings page and click the listing that you want to edit. On the left side, select "Pricing and availability". Select "Taxes". On the right, click the Edit button next to Taxes.
3. On the Occupancy Tax Collection page, click the "Add a tax" button.
4. On the Add a tax page:
--- Select the Tax type from the drop-down menu. I selected "Tourist tax" for Osceola county taxes.
--- Select the Type of charge and then add the amount being collected in the box under Amount. I selected "Percentage per booking" and a 6% amount.
--- Select the Taxable Base charges.
--- Add the Business tax ID and Accommodations tax registration numbers.
--- Under the "Does your jurisdiction provide exemptions for long-term stay?", choose Yes. Enter 180 days. See this link for further info: https://osceolatax.com/wp-content/uploads/2021/03/New-Local-Business-Tax-Receipt-Tourist-Tax-Applica...
--- Agree to the terms and click Save.
This worked for me. Hope it helps you.