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GST Calculator
Add or remove GST at any slab and see the CGST, SGST and IGST split on the invoice.
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Result
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Two questions come up constantly: what does this cost with GST added, and how much GST is buried in a price I have been quoted? Both are here.
Adding versus removing
Adding is simple multiplication. Removing is not: an inclusive price of ₹118 at 18% contains ₹18 of tax, not ₹21.24. You divide by 1.18 rather than taking 18% of the total. Getting this backwards overstates your input credit, which is the kind of error that surfaces during a reconciliation.
CGST, SGST and IGST
Within a state the tax splits equally between the centre and the state. Across states the same total is charged as one IGST line. The rate is identical either way — only the heads change, and with them the credit ledger the amount lands in.
Rounding
Round the invoice total to the nearest rupee. Section 170 permits it and the portal expects it. Rounding each line separately is what causes a reconciliation to drift by a few rupees a month.
Frequently asked questions
How do I remove GST from an inclusive price?
Divide by one plus the rate rather than taking the rate off the total. At 18%, an inclusive price of ₹118 contains ₹18 of tax, not ₹21.24. Getting this backwards overstates input credit, which surfaces later during reconciliation.
When is IGST charged instead of CGST and SGST?
IGST applies when the place of supply is in a different state from the supplier. Within a state the same total splits equally into CGST and SGST. The rate is identical either way; only the credit ledger the amount lands in changes.
Which GST rate applies to my product?
Rates are set by HSN or SAC code, not by category name. Most services sit at 18%, essentials at 5% or nil, and a small set of goods at 28% with cess. Confirm the code on the CBIC rate finder before you invoice.
Should I round the GST on each line or on the total?
Round the invoice total to the nearest rupee. Section 170 permits it and the portal expects it. Rounding each line separately is what causes a reconciliation to drift by a few rupees every month.