GST calculator

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Amount (Rs) Exclusive (before GST) when adding; inclusive when removing.

GST rate % (editable) Default 18. Pick a slab or type any rate.

GST 2.0 slab preset Slabs can change. Edit the rate box to match the circular you use.

Calculation Add: tax on top. Remove: back out tax from MRP.

Place of supply Same state: half CGST, half SGST. Other state: full IGST.

Exclusive (net)

GST amount

Inclusive total

Breakup	Value

GST 2.0 slab heights (tax on Rs 10,000 exclusive)

5%
Rs 500

18%
Rs 1,800

40%
Rs 4,000

Not tax advice. Does not apply compensation cess, reverse charge, or composition rates. Confirm HSN/SAC on the current notification.

By Cobra · Last updated October 14, 2026

When CGST/SGST vs IGST

Place of supply drives the split, not the GST rate itself.

Intra-state (same state / UT): total GST splits equally into CGST + SGST (or UTGST). At 18%, that is 9% + 9%.
Inter-state (other state, or typical import IGST path): the full tax sits in IGST at the chosen rate.

The tool only applies that split. It does not compute compensation cess, reverse charge, composition rates, or e-invoice validation. Confirm HSN/SAC on the notification you invoice under. Not tax advice. Disclaimer.

GST 2.0 slab walkthrough (5 / 18 / 40)

Presets follow GST 2.0-style slabs (effective 22 Sep 2025 on this page’s copy) plus leftover niche rates. The rate box is always editable.

Rate	Typical use on this page	Add GST on Rs 10,000 (tax)
5%	Essentials preset	Rs 500 → inclusive Rs 10,500
18%	Standard (default)	Rs 1,800 → inclusive Rs 11,800
40%	Sin / luxury preset	Rs 4,000 → inclusive Rs 14,000
0% / 0.25% / 3% / 12% / 28%	Nil, rough diamonds, gold, some bricks/tiles, pan masala/tobacco leftover	Use the preset or type a custom %

Slabs can change. Treat the dropdown as a convenience, not an official rate chart.

Add GST vs remove GST

Add (exclusive in): tax = amount × rate/100, inclusive = amount + tax. For quick “what is X% of Y” checks outside GST slabs, see the percentage calculator.

Remove (inclusive in): exclusive = amount ÷ (1 + rate/100), tax = amount − exclusive.

Example at 18% with Rs 10,000: add → tax Rs 1,800, inclusive Rs 11,800 (intra: CGST = SGST = Rs 900). Remove with the same Rs 10,000 as MRP → exclusive ≈ Rs 8,474.58, tax ≈ Rs 1,525.42. Mixing exclusive and inclusive figures by 18% on a large PO line is a common spreadsheet error: pick the mode that matches the figure you typed. For withholding on payments rather than invoice GST, see the TDS calculator.

FAQ

How do I add GST vs remove GST?

Add GST (exclusive): tax = amount × rate/100, inclusive total = amount + tax. Remove GST (inclusive / reverse): exclusive = amount ÷ (1 + rate/100), tax = amount − exclusive. Pick the mode that matches whether your figure already includes GST.

What GST rates does this calculator use?

Presets follow GST 2.0 (effective 22 Sep 2025): 0%, 5%, 18%, and 40%, plus leftover niche rates still in force: 0.25% (rough diamonds), 3% (gold/jewellery), 12% (some bricks/tiles), 28% (pan masala and tobacco until a later notification). The rate box is editable. Slabs can change; this is not an official rate chart.

What is the difference between CGST, SGST, and IGST?

Intra-state supplies split GST equally into CGST and SGST (or UTGST). Inter-state supplies and imports use IGST at the full rate. The calculator applies that split only; it does not apply cess, reverse charge, or composition-scheme rates.

Are invoice amounts uploaded?

No. Amount, rate, add/remove mode, and intra/inter split run in your browser. Nothing is sent to ToolPetal.