How do I add a new sales tax for the added 24.7% tax or a total 37.7% tax for fuel only, I'm in Ontario Canada, We had a bookkeeper set us up years ago.

Hi there, 

QuickBooks Online makes it easy for you to track and calculate sales tax for your small business. I know how important it is to work with a software that's flexible enough to let you control which tax codes to use and to add new ones when necessary. I'd be happy to explain how you can add a new sales tax. 

QBO lets you add sales taxes for your province or territory, but you can also create group or custom taxes. In this case, it sounds like you'd be suited to create a custom tax. 

Here's how: 

1. From the left menu, select Taxes.
2. Select Sales Tax at the top. (Tip: If you use payroll in QuickBooks Online, you may need to select Sales Tax as opposed to Payroll Tax.)
3. Select Manage sales tax.
4. Locate the sales tax agency you wish to add the new rate for, and select Add custom rate.

For more information about the different types of taxes in QBO and how to set them up, take a look at this article: How to set up a new sales tax code. 

I hope this helps get you back on track. If you have any other questions, please touch base with our tech support team. 

Have a nice day.