# GST Calculator

> Add GST to a price or remove it from a GST-inclusive price, at 0%, 3%, 5%, 18% or 40%, with the CGST/SGST split.

Interactive calculator: https://www.cashiq.in/tools/gst-calculator
Last updated: 2026-11-10

A GST calculator adds Goods and Services Tax to a price or takes it out of an inclusive price. Since 22 September 2025 the main GST slabs are 5% and 18%, with 40% for luxury and sin goods. 18% GST on ₹1,000 is ₹180, so the price becomes ₹1,180.

## How it is calculated

```
GST = price × rate ÷ 100;  price before GST = inclusive price ÷ (1 + rate ÷ 100)
```

- Adding GST: total = price + price × rate.
- Removing GST from an inclusive price: base = total ÷ (1 + rate), GST = total − base.
- Within a state, GST is split equally into CGST and SGST. Between states, it is charged as IGST.

## Worked example

- Inputs: ₹1,000 before GST at 18%
- Result: GST ₹180 (₹90 CGST + ₹90 SGST), total ₹1,180
- Open it: https://www.cashiq.in/tools/gst-calculator?amount=1000&rate=18&mode=add

## Use it with your own numbers

Add query parameters to the calculator URL. The page renders the result, a one-sentence summary and a year-by-year table in its HTML.

| Parameter | Meaning | Allowed values |
| --- | --- | --- |
| `amount` | Amount | 1 to 1,00,00,00,000 |
| `rate` | GST rate | 0 | 3 | 5 | 18 | 40 |
| `mode` | Amount is | add | remove |

Example: https://www.cashiq.in/tools/gst-calculator?amount=1000&rate=18&mode=add

JSON API: https://www.cashiq.in/api/v1/gst-calculator?amount=1000&rate=18&mode=add

## Rules and assumptions

- GST slabs since 22 September 2025: 0% (nil-rated), 5%, 18%, and 40% for luxury and sin goods. Gold and jewellery are taxed at 3%.
- The rate depends on the HSN or SAC code of the item. Check the CBIC rate schedule for a specific product.

## Frequently asked questions

### What are the GST slabs now?

Since 22 September 2025: 0%, 5%, 18% and 40%, plus special rates such as 3% for gold. The old 12% and 28% slabs were folded into these.

### How do I remove GST from a price?

Divide the inclusive price by (1 + rate). For 18%, ₹1,180 ÷ 1.18 = ₹1,000, so GST is ₹180.

### What is CGST and SGST?

For sales within a state, GST is split equally between the central (CGST) and state (SGST) governments. Inter-state sales carry IGST instead.

## Sources

- [CBIC](https://www.cbic.gov.in/)

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Results are estimates for planning, not investment, tax or legal advice. Returns are assumptions, not guarantees. Source: CashIQ, https://www.cashiq.in/tools/gst-calculator