18% GST on ₹100

18% of ₹100 is ₹18. If ₹100 is the price before GST, the total is ₹118. If ₹100 already includes 18% GST, the price before tax is ₹84.75 and the GST in it is ₹15.25.

GST @ 18% on ₹100₹18price excludes GST

Total with GST₹118₹100 + ₹18

GST inside ₹100₹15.25price includes GST; base ₹84.75

Try another amount in the GST calculator

₹100: GST exclusive vs inclusive

	₹100 + GST	₹100 incl. GST
Price before GST	₹100	₹84.75
GST @ 18%	₹18	₹15.25
Total	₹118	₹100

Exclusive (adding GST): GST = ₹100 × 18 ÷ 100 = ₹18.
Inclusive (removing GST): base = ₹100 × 100 ÷ 118 = ₹84.75; GST = ₹100 − ₹84.75 = ₹15.25.

CGST, SGST and IGST split

Within a state, the 18% is split equally into CGST and SGST (UTGST in union territories without a legislature) at 9% each. On a sale to another state, or an import, the full 18% is charged as IGST.

	₹100 + GST	₹100 incl. GST
CGST @ 9%	₹9	₹7.63
SGST / UTGST @ 9%	₹9	₹7.63
or IGST @ 18%	₹18	₹15.25

Shown to the paisa. On an invoice, tax is usually rounded to the nearest rupee or paisa as your billing software is set up.

What is taxed at 18%

18% is the standard rate of GST 2.0 and covers most services (IT, telecom, professional and repair services among them) and many goods. Air conditioners, all TVs, dishwashers, small cars, motorcycles up to 350 cc, buses, trucks, three-wheelers and cement moved here from 28%, and all auto parts now pay a uniform 18%.

The rate for a particular item depends on its HSN code (goods) or SAC code (services), so confirm it in the CBIC rate notifications before you invoice.

Source: Recommendations of the 56th Meeting of the GST Council, Ministry of Finance press release, 3 September 2025 (PIB) (also on the GST Council website): a 5% merit rate, an 18% standard rate and a special 40% de-merit rate, with the rate changes on goods and services effective from 22 September 2025.

₹100 at every GST rate

Rate	GST	Total
5%	₹5	₹105
18%	₹18	₹118
40%	₹40	₹140
12% (pre-22 Sep 2025)	₹12	₹112
28% (pre-22 Sep 2025)	₹28	₹128

18% GST on other amounts

All GST tables · GST calculator · GST invoice format and rules

Questions people ask

What is 18% GST on ₹100?

₹18. Added to a price of ₹100 before tax, the total is ₹118. Within a state that is ₹9 CGST plus ₹9 SGST; between states it is ₹18 IGST.

How much GST is included in ₹100 at 18%?

₹15.25. If ₹100 already includes 18% GST, the price before tax is ₹100 × 100 ÷ 118 = ₹84.75, and the GST in it is ₹15.25. Taking 18% off ₹100 directly (₹18) gives the wrong answer.

What is taxed at 18% GST?

Since 22 September 2025, 18% is the standard rate of GST, covering most services and many goods, including ACs, TVs, small cars, cement and auto parts. The exact rate depends on the HSN or SAC code, so check the CBIC rate notification for your item.