GST
Checking the GST math on a bill
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Facts
GST is a percentage of the taxable value after discounts given on the invoice. For intra-state bills, CGST and SGST are each half the rate.
Provisions and law
- Sec 15, CGST Act 2017Value of supply after discounts shown on the invoice
Analysis
On ₹1,000 with a ₹100 discount, taxable value is ₹900. At 18 percent, GST is ₹162: ₹81 CGST and ₹81 SGST. If tax is worked on ₹1,000, you overpay ₹18. Rounding should be to the nearest rupee only.
Conclusion
- Find the taxable value after discount.
- Multiply by the rate.
- Split into CGST and SGST.
- Ask for correction if wrong.
A Savvy can do this for you
Checking GST on a bill: GSTIN validity, rate and tax shown
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