I'm new to QB Online. After enabling GST (Singapore Tax), it has automatically created 20 x Tax Codes - a lot.

1. I have no idea what purpose each code is for. Is there any explanation / documentation? For example which code should I use for sales within Singapore (8%)? There are more than one Tax Codes that has 8%.

2. These codes are not editable. What happens on 1st Jan 2024 when standard GST goes to 9%?