IGST calculator
When the place of supply is in a different state or union territory, GST is charged as a single integrated tax — IGST — at the full rate instead of a CGST/SGST split.
Result
- Taxable value
- ₹10,000.00
- IGST @ 18%
- ₹1,800.00
- Total invoice value
- ₹11,800.00
GST rates and rules change. Please verify current rules with official government sources or your CA before filing.
When does IGST apply?
IGST applies to interstate supplies: your registered state and the place of supply are different. The rate is the same total as an intrastate sale of the same item — 18% remains 18% — but it appears as one IGST line rather than 9% + 9%.
For services, the place of supply usually follows the recipient's location, which is why remote work for a client in another state is typically an IGST invoice even though nothing physically moved.
Worked example
A Bengaluru consultant bills a Delhi client ₹7,000 at 12%: taxable value ₹7,000, IGST ₹840, invoice total ₹7,840 — one tax line, one rate.
GST rates and rules change. Verify current rules with official government sources or your CA before filing.
Invoice interstate clients properly
BillBook stores each client's state and GSTIN, picks IGST automatically when the place of supply differs, and tracks it per financial year.
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