I can't figure out how to make sure there's GST being added to my invoices?!

Hi chaunceyjade1, 

QuickBooks Online is a great all-in-one tool for your small business accounting. Sales tax is a necessary part of your bookkeeping, and it's vital to make sure you're adding and tracking sales tax as needed. I'd be happy to explain how to add GST to your invoices.

The first step will be to enable sales tax if you've not yet done so. To do that, click the Taxes tab and click Set up Sales Tax. QuickBooks Online automatically generates tax codes based on your region, and you can add additional tax rates as needed. 

The next step is to assign a tax to your invoice. Click + New > Invoice to create an invoice. You'll enter the necessary product information, then select a tax code in the Sales Tax column. You'll have to assign a tax to each line item on the invoice, and the system will prompt you to do so before saving your form.

I hope this helps. For more information about the invoice creation process in QuickBooks Online, check out this article: Create invoices in QuickBooks Online.

Have a great day.