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Different ways to calculate GST. How to calculate GST.

GST-exclusive amounts and GST-inclusive amounts can be calculated in a number of

different ways, using the guide below can help you easily calculate it yourself:

  • GST-exclusive amount × 15% ( or 0.15, or  3/20 ) = GST.
  • GST-exclusive amount × 115% ( or 0.15, 23/20  ) = GST-inclusive amount.
  • GST-inclusive amount × 3/23 = GST.
  • GST-inclusive amount × 20/23 = GST-exclusive amount.

Examples:

You sell goods for $8,000 Plus GST:

  • GST: $8,000 × 15% = $1,200

    • $8,000 + $1,200 = $9,200
    • $8,000 × 115% = $9,200
    • $8,000 × 23/20 = $9,200

You sell goods for 10350 including GST:

  • GST-inclusive amount:GST: $10,350 × 3/23 = $1,350
  • GST-exclusive amount:
    • $10,350 – $1,350 = $9,000
    • $10,350 × 20/23 = $9,000

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