Hi lynabond,
You'll want to verify your supplier's transactions if they're inclusive of tax. Let me guide you on how to check.
- Click Expenses, then Suppliers.
- Click on the supplier's name, then click each transactions.
- Make sure to select a tax name or rate under the GST column and in the Amounts are drop-down, select Inclusive of Tax.
- Click Save and close.
I've added a screenshot for you.
Once done, run your tax reports again.
Please refer to this article for more information about: GST Settings Overview.
You can also check our page about managing suppliers and expenses if you need some help articles for your future tasks.
Don't hesitate to come back here in the Community space if you have other questions.