Question 1

What is a reverse GST calculator?

Accepted Answer

Normal GST math adds tax on top of a taxable value. A reverse calculation goes the other way: you start with the final, all-inclusive price you actually charged or paid, and the tool strips the tax out, leaving the taxable value and the GST portion. It is the calculation freelancers need whenever a client negotiates a flat 'this is the total, figure out the GST' price.

Question 2

How is the taxable value derived from an inclusive price?

Accepted Answer

Divide the total by (1 + rate/100). For an 18% rate, ₹11,800 inclusive becomes ₹11,800 ÷ 1.18 = ₹10,000 taxable value, with ₹1,800 as GST. A common mistake is subtracting 18% of the total (₹2,124), which overstates the tax because GST is charged on the taxable value, not on the final price.

Question 3

When do I use CGST + SGST versus IGST?

Accepted Answer

CGST + SGST applies when the supplier and the customer are in the same state (intra-state): the GST splits equally between the centre and the state. IGST applies when they are in different states (inter-state), and the full amount is collected as integrated tax. The total GST is identical either way; only the heads change.

Question 4

Can I put these numbers straight onto an invoice?

Accepted Answer

Yes. A GST-compliant invoice needs the taxable value and the tax heads shown separately, exactly as this breakdown presents them. Salarier generates that invoice for you with the same numbers, plus HSN/SAC codes, your GSTIN, and the customer's details, so the document stays Rule 46 compliant.

Reverse GST calculator

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