GST – Goods and services tax

## Add GST calculation:

Net amount = Initial amount

GST amount = Initial amount х GST rate _{(%)}

Gross amount = Initial amount + GST amount

**For example:**

Initial amount = $100

GST rate = 12%

So,

GST amount = $100 x 12% = $12

Gross amount = $100 + $12 = $112

## Subtract GST calculation

Gross amount = Initial amount

Net amount = Initial amount / (100% + GST rate _{(%)}) x 100%

GST amount = Gross amount – Net amount

**For example:**

Initial amount = $100

GST rate = 12%

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So,

Net amount = $100 / (100% + 12%) x 100% = $89,29

GST amount = $100 – $89,29 = $10,71

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