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Finance & Business · pattern A, Numeric fields

GST added and extracted, with the CGST/SGST split.

Enter a taxable value and GST rate for the tax and total, with the reverse calculation and the central and state split for intra-state supply.

Inputs

The formula used

GST = taxable value × rate; value = total ÷ (1 + rate)

For intra-state supply the total splits equally into CGST and SGST. For inter-state supply the whole amount is IGST.

GST

1,800.00

Total including GST
11,800.00
CGST at half the rate
900.00
SGST at half the rate
900.00
Taxable value from the total
10,000.00
GST within the total
1,800.00
IGST if inter-state
1,800.00

Rates, slabs, exemptions and place-of-supply rules change and vary by item. Use current official rate notifications for anything real.

The intra-state split is administrative, not additional.

An 18% intra-state supply is 9% CGST plus 9% SGST — the same 18% divided between central and state governments, not a doubling. Inter-state supply is charged as a single IGST at the full rate, which the centre later apportions. Students frequently double-count the split, which inflates every subsequent figure.

Questions about gst

What is the reverse charge mechanism?
Cases where the recipient rather than the supplier accounts for the GST — common for imported services and certain notified supplies.
How does input tax credit work?
GST paid on business inputs can be set against GST charged on outputs, so only the value added is taxed. Documentation requirements are strict.
Which rate applies to my item?
It depends on the HSN classification, and the slabs are revised periodically. Check the current notification rather than a remembered figure.

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