GST Calculation

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

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For example:

Initial amount = $100
GST rate = 12%

So,

Net amount = $100 / (100% + 12%) x 100% = $89,29
GST amount = $100 – $89,29 = $10,71

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