Using the GST Calculator
Enter the applicable GST rate yourself and select whether the starting amount includes tax. Choose an intra-state or inter-state illustration to see how the calculated tax amount is allocated.
Worked example
Use the example inputs below to reproduce this result. These are the form's starting values, not recommended targets. Changing your inputs updates your result above; this worked example stays fixed for comparison. Results are rounded for display.
Example inputs
- Amount (₹)
- 1000
- GST rate (%) — enter applicable rate
- 18
- Calculation
- Add GST
- Supply scenario
- Intra-state
Example result
- Net amount (₹)
- 1,000
- GST amount (₹)
- 180
- Gross amount (₹)
- 1,180
- CGST illustration (₹)
- 90
- SGST illustration (₹)
- 90
Method and assumptions
Add: gross = net × (1 + rate/100). Remove: net = gross / (1 + rate/100). Amounts are rounded to paise; intra-state tax is split equally with any spare paise allocated to SGST in this illustration. The supplied rate and supply scenario are assumptions, not legal classification or filing advice.
Reference: cbic-gst.gov.in — method and further reading
Match the tax year and scope
Tax estimates depend on the year, jurisdiction and definitions used in the model. Check whether an input means gross income, taxable income or an amount after a particular deduction. Keep excluded credits, other taxes and special circumstances separate. A simplified scenario can explain a relationship without reproducing the amount on an actual return.
Common question
Why can I not subtract the GST percentage directly from an inclusive price?
The rate applies to the net amount, rather than to the gross amount that already includes tax. Divide the gross amount by one plus the rate as a decimal, then subtract that net amount to find the included tax.