Net / gross definitions
- Net → Gross (exclusive input): tax = amount × (rate / 100), gross = amount + tax
- Gross → Net (inclusive input): base = gross ÷ (1 + rate / 100), tax = gross − base
Rounding uses your chosen mode (nearest / up / down). INR amounts are shown with Indian digit grouping.
When to use this calculator
Use this page when you need a GST-exclusive or GST-inclusive amount in INR and want the India-specific CGST+SGST or IGST split. Presets are calculation shortcuts, not a product-classification decision.
Best workflow
- Decide whether the amount is before GST or already GST-inclusive.
- Confirm the notified GST classification and effective date, then choose a current preset, historical rate, or custom rate.
- Choose the supply type and rounding rule before copying the result.
Most 56th GST Council rate changes took effect on 22 September 2025, with specified tobacco products following a later-notified schedule. See the official GST Council FAQ.
When to open another tax page
- Use VAT / Sales Tax when you need a custom global tax rate rather than India GST.
- Use Consumption Tax when one receipt mixes several Japanese item rates.
- Use Income Tax when the question is annual personal tax rather than invoice tax.
FAQ
Should I enter a base amount or a GST-inclusive total?
Use the GST-inclusive checkbox when your source amount already includes tax. Leave it off when the amount is the base price and you want GST added on top.
When does supply type matter?
Supply type matters when you need to split GST into CGST+SGST or show it as IGST. If you only need one total tax number, choose the mode that matches the document you are reproducing.
Which GST rate should I select?
Use 5% or 18% only after confirming the current classification. The 40% preset is limited to selected demerit goods, while 12% and 28% are provided for historical documents. Use a custom rate when an official notification specifies another rate.
What should I verify before sharing a GST result?
Verify the exclusive or inclusive direction, notified classification and date, supply type, and rounding rule. Those settings explain nearly every difference between two GST outputs.