Add GST to a price, or take it out of a GST-inclusive price, at 5, 12, 18 or 28 per cent — with the CGST and SGST halves shown.
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Add 18% to ₹1,000: GST = 1,000 × 18 ÷ 100 = ₹180 (CGST ₹90 + SGST ₹90), total ₹1,180. Remove 18% from ₹1,180: base = 1,180 ÷ 1.18 = ₹1,000.
GST = 2000 × 18 ÷ 100 = ₹360
Total payable = 2000 + 360 = ₹2,360
On the invoice, for a sale within the state:
CGST @ 9% = ₹180
SGST @ 9% = ₹180
Total tax = ₹360, exactly as before. The split is an accounting matter, not extra tax.
Quoted from GST Calculation — Inclusive vs Exclusive Price.
Correct method — divide.
Base = 2360 × 100 ÷ 118 = 236 000 ÷ 118 = ₹2,000
GST = 2360 − 2000 = ₹360
Check by the direct formula: GST = 2360 × 18 ÷ 118 = 42 480 ÷ 118 = ₹360 ✓
The wrong method — subtracting 18%.
2360 × 0.82 = ₹1,935.20, which is ₹64.80 short of the true base price.
Quoted from GST Calculation — Inclusive vs Exclusive Price.
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