I am not GST registered, whereas my suppliers are. How do I created invoices that auto-calculate GST without creating a "GST payable" account?

Let me share some information on how GST calculation works in QuickBooks Online, inthelocality-gm. 

The taxes from transactions entered in QuickBooks are accumulated in the default Control Account. When you Mark as Filed a tax period on the Taxes page, this transfers from Control Account going to the Suspense Account which stands as your payable. You can check out this article on how QuickBooks calculates GST: Set up and use GST in QuickBooks Online. 

Once you record a tax payment this will remove the amount in the Suspense Account and QuickBooks will only create a payment check that shows in your report. Since you don't want to post it in the GST payable account, I'd suggest consulting your accountant on how to record your supplier transactions. From there, they'll provide you with some options since only your suppliers are GST registered.

Just in case you need to set up GST, here's how to automatically track it when making a sale: 

1. Follow the usual steps to create an invoice or sales receipt.
2. Make sure the Location of sale is correct.
3. If you ship ordered items, add the Shipping to, Ship via, Shipping date, Tracking no. info so QuickBooks knows where to charge your GST.
4. Check your taxable items in the GST column. If you haven't already, add tax categories to your products and services. This lets QuickBooks know what's taxable and what isn't.
5. Press Save and send.

I've got articles here for more insights on what steps you need to take before filing and paying your taxes: 

• File and pay Tax/GST
• QuickBooks Online GST Help Articles

Keep in touch if you need any more assistance with this, or if there's something else I can do for you. I've got your back. You have a good one.