Bills & payments
GST Calculator for Contractors — Inclusive & Exclusive Amounts
Quote a GST-exclusive price, or find the taxable value inside a GST-inclusive total — with the CGST and SGST split for supplies within a state, or IGST for inter-state supplies.
Amount
GST rate
Total with GST
₹0
How this is worked out
Works contracts for government are mostly taxed at 18%; some (e.g. certain earthwork-heavy or affordable housing works) at lower rates — check the notification that applies to your work.
Frequently asked questions
How do I calculate the base amount from a GST-inclusive price?
Divide the inclusive amount by (1 + GST rate ÷ 100). For example, at 18% GST, ₹1,18,000 ÷ 1.18 = ₹1,00,000 base value and ₹18,000 GST.
When is CGST + SGST charged instead of IGST?
CGST and SGST (each half the rate) apply when the supplier and the place of supply are in the same state; IGST at the full rate applies to inter-state supplies.
Figures are for planning. The conditions in your tender document or contract always take precedence.
Let the calculators fill themselves in
With a free Digi Karya account, these tools pull in your own contracts, tenders, bills and documents — and you also get licence and GST expiry reminders, a tender workspace, milestone billing and EMD & bank guarantee tracking.