If you use Tax applied during purchases from the supplier, you can record the tax in that transaction. Also, you can view the tax reports based on date ranges or for each transaction. Here is a tutorial on how to use Tax and how to view the reports:
Step 1. Go to Buy, then Make Purchase Transaction
You can input supplier name, product, qty, and also choose the tax.
Step 2. Go to Reports, Click More Menu, then Choose Purchase Tax Report
You may go to the Reports menu and click on the More menu then choose "Purchased Tax Report".
Step 3. View Purchase Tax Report and Filter Report as Needed (Optional)
You will see all the transactions with the type (Tax) or not. And can download the file too, through "Export".