Including / Excluding GST
By Default, all parts of the program will be Tax Inclusive and will use the default GST tax code.
If you wish to set new Sales Records to Tax Exclusive mode by default, you can go to Setup > Preferences > Misc and change the Default Prices As dropdown to Tax Exclusive.
This can also be done as needed on the Sales Record screen, via the selector at the bottom right of the item lines.
For mote information on tax codes in HirePOS, see this article: Tax Codes