Practical GST tools for businesses
Calculate, check and act—built for freelancers, small businesses and invoice workflows.
Use current rules for a new invoice. Confirm the rate from the relevant HSN/SAC and official notification.
Choose your task
GST Calculator
Add or remove GST and split CGST/SGST or IGST.
Reverse GST
Find tax and taxable value within an inclusive price.
Registration Check
Check when GST registration may be required.
Composition vs Regular
Compare composition tax with ITC-aware regular GST.
ITC Reconciliation
Identify ITC gaps and invoices needing follow-up.
GSTIN Validator
Check GSTIN format and state-code structure.
Invoice Calculator
Create a line-by-line GST invoice breakdown.
How GST calculations work
Exclusive price
GST = taxable value × GST rate
Invoice total = taxable value + GST.
Inclusive price
Taxable value = inclusive amount × 100 ÷ (100 + rate)
GST = inclusive amount − taxable value.
Place of supply
Intra-state supplies generally split GST equally into CGST and SGST. Inter-state supplies generally use IGST.
Recommended next action
Starting or growing a business
Check GST registration eligibility first.
Sending an invoice
Build the taxable value and tax breakup.
Reviewing purchases
Reconcile eligible ITC before return preparation.
Calculations are estimates, not tax advice. Verify classification, place of supply, eligibility and current notifications before invoicing or filing.