Hi JPLawnandSnow,
Thanks for posting in the Community! In QuickBooks Online your GST owed and paid to the ATO is based on GST collected (sales) minus GST paid (purchases). Regarding what GST code to apply on the recorded transaction for a refund, we'd recommend reaching out to your accountant or bookkeeper for any tax advice.
You can check these articles below to learn more on how to record a GST refund and GST payment in QuickBooks Online:
Message us back if you need more help with your GST in QuickBooks Online. Have a nice day!
