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GST Tools

GST Calculator — CGST / SGST / IGST Splitter

Compute the CGST + SGST or IGST split for any taxable amount and rate.
Intra-state vs inter-state handled separately. No data leaves your device.

In this section

Tools

Supply type

FAQ

When do CGST + SGST apply vs IGST?

CGST + SGST apply when the supplier and place of supply are in the same state (intra-state). IGST applies when they are in different states (inter-state). The total tax rate is identical in either case — only the split changes.

Is the rate split exactly equal between CGST and SGST?

Yes. Under the CGST and respective SGST acts, the rate notified for intra-state supplies is split exactly in half between CGST and SGST. An 18% GST rate becomes 9% CGST + 9% SGST.

What if my amount already includes GST?

Toggle "Amount is inclusive of GST" and we back-compute the taxable base. The total tax and split are calculated against that back-computed base.

Do you store anything I enter?

No. This calculator runs entirely in your browser. We never see your numbers.

References

Related guides

Last reviewed: 23 May 2026

FAQ

GST calculator — common questions

When do CGST + SGST apply vs IGST?
CGST + SGST apply when the supplier and place of supply are in the same state (intra-state). IGST applies when they are in different states (inter-state). The total tax rate is identical in either case — only the split changes.
Is the rate split exactly equal between CGST and SGST?
Yes. Under the CGST and respective SGST acts, the rate notified for intra-state supplies is split exactly in half between CGST and SGST. An 18% GST rate becomes 9% CGST + 9% SGST.
What if my amount already includes GST?
Toggle "Amount is inclusive of GST" and we back-compute the taxable base. The total tax and split are calculated against that back-computed base.
Does the GST calculator store the figures I enter?
No. This calculator runs entirely in your browser. We never see your numbers.