Hi asharma1,

One of the reasons why your line 1B GST paid on purchases is negative is due to the amendments. An amendment appears when a transaction from a previously lodged BAS period has been edited after it was lodged, carrying forward the changes to the next BAS period you're about to lodge.

You can run the Transactions by Tax Code and BAS Detail report and compare the figures. Here's how:

1. Click on the GST tab.
2. Click on Run reports, and select Transactions by Tax Code.
3. Select a BAS period and accounting method.
4. Click on Run report.

To correct and clear the amendments you'll have to request to unlodge the BAS period in which the date of the amendment is showing. Accountant user in QuickBooks Online has the ability to unlodge BAS. If not, I'd recommend contacting our Customer Care Team to request to unlodge the BAS period affected.

You can also check this link to learn more about What to do when BAS amounts look incorrect and How to unlodge a BAS.

Post again in the Community if you have more questions.