Free GST Calculator India 2026: CGST, SGST & IGST Online | Legaldev
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Legaldev Free GST Calculator

Legaldev introduces a free GST calculator made just for small businesses! With this tool, you'll be able to calculate GST in minutes without any complex math.


GST %
5%
0%
5%
18%
40%
Tax
Exclusive
Exclusive
Inclusive

What Does This GST Calculator Do?

You have an amount. You need to know the GST on it. That is all this tool is for.

Enter the figure, pick the applicable GST rate, tell it whether your price already includes tax or not, and the calculator shows you the base amount, the GST component, and the total split into CGST and SGST for intra-state, or IGST for inter-state transactions.

No spreadsheet. No formula. No CA needed for a quick check.

This works for business owners raising invoices, freelancers billing clients, accountants verifying numbers, and anyone who just received a quotation and wants to understand the tax portion.

How to Use the GST Calculator: Step by Step

Step 1

Enter Your Amount

Type the price of your goods or services in the Amount field. This can be the price before tax or the price your customer actually pays you will specify this in Step 3.

Step 2

Select the GST Rate

Choose from the updated 2026 GST slabs:

  • 0% - Essential items: fresh vegetables, milk, eggs, rice, wheat, books, healthcare
  • 5% - Common goods and services: packaged food, soaps, shampoos, butter, economy travel, small restaurants
  • 18% - Most goods and services: electronics, mobile phones, TVs, AC, cars (small), most professional services, restaurants with AC, hotel rooms
  • 40% - Luxury and sin goods: premium cars, motorcycles above 350cc, aerated drinks, tobacco, gambling, online gaming
  • 3% - Gold, finished jewellery, imitation jewellery
  • 0.25% - Rough diamonds, unworked precious stones
Step 3

Choose Inclusive or Exclusive

GST Exclusive (most B2B invoices): Your entered amount does not include GST. The calculator adds the tax on top.

GST Inclusive (retail prices, MRP): Your entered amount already has GST baked in. The calculator reverse-calculates and separates the base price from the tax portion.

Step 4

View Your Result

The tool instantly shows:

  • Base Amount: price before GST
  • GST Amount: the tax component (split as CGST + SGST or IGST)
  • Total Amount: the final figure the buyer pays
Note: The 12% and 28% slabs no longer exist under GST 2.0. These were replaced effective September 22, 2025, following the 56th GST Council meeting. Many items previously at 12% moved to 5% or 18%. Items at 28% plus cess now fall under the unified 40% slab.

GST Calculation Formula - How the Math Works

For those who want to verify manually or understand what the calculator is doing:

GST-EXCLUSIVE CALCULATION
GST Amount = Original Price x GST Rate / 100
Total = Original Price + GST Amount
Worked Example: GST Exclusive at 18%

Service billed at Rs. 10,000. GST rate: 18%.

GST = Rs. 10,000 x 18 / 100Rs. 1,800
Invoice totalRs. 11,800
CGSTRs. 900
SGST (intra-state)Rs. 900
OR IGST (inter-state)Rs. 1,800
GST-INCLUSIVE REVERSE CALCULATION
Original Price = Inclusive Price x 100 / (100 + GST Rate)
GST Amount = Inclusive Price minus Original Price
Worked Example: GST Inclusive Reverse at 5%

Product sold at Rs. 1,050 inclusive of 5% GST.

Original Price = Rs. 1,050 x 100 / 105Rs. 1,000
GST Amount = Rs. 1,050 minus Rs. 1,000Rs. 50

GST 2.0: What Changed in 2026 and Why It Matters

India's GST system got its biggest update since launch in July 2017. The 56th GST Council meeting on September 3, 2025, introduced what is now called GST 2.0, effective September 22, 2025.

The old five-slab structure (0%, 5%, 12%, 18%, 28%) is gone. Here is what replaced it:

What got cheaper
  • Daily-use items like soaps, shampoos, packaged food moved from 12% to 5%
  • Agricultural equipment moved from 12% to 5%
  • 33 lifesaving drugs moved to nil (0%)
  • Individual health and life insurance premiums moved to 0%
What stayed the same
  • Most professional services remain at 18%
  • Electronics like mobile phones, laptops at 18%
What got a new higher rate
  • Premium cars, motorcycles above 350cc, tobacco, aerated beverages, online gaming, gambling moved from 28% + cess to a clean 40% rate
Why this matters for your invoices: If you or your CA is still using 12% or 28% on invoices after September 22, 2025, those invoices are wrong and can attract GST notices. This calculator uses the current 2026 slabs.

Current GST Rate Slab Table: 2026 Updated

GST RateWhat It Covers
0% (Nil)Rice, wheat, fresh vegetables, milk, eggs, curd, bread, salt, books, newspapers, healthcare services, individual insurance
5%Packaged food, soaps, shampoos, hair oil, toothpaste, butter, ghee, fruit juice, economy air travel, small restaurant (no AC), footwear under Rs. 1,000
18%Most services, mobile phones, electronics, laptops, TVs, AC, small cars, motorbikes under 350cc, restaurant with AC, hotel rooms, construction services, professional fees
40%Luxury cars, motorbikes above 350cc, aerated drinks, tobacco (after cess settlement), pan masala, online gaming with real money, betting, gambling, horse racing
3%Gold, silver, finished jewellery, imitation jewellery
0.25%Rough diamonds, unworked precious stones

This table reflects rates effective September 22, 2025 onward. For specific HSN code classification, visit the official GST portal at gst.gov.in or consult a CA.

CGST, SGST, IGST and UTGST: Explained Simply

There are four types of GST in India. Which one your transaction attracts depends on one thing: are the buyer and seller in the same state or not?

CGST

Central GST - Collected by the central government when a transaction happens within the same state. Always paired with SGST. Each is charged at half the total GST rate.

Example: 18% intra-state GST = 9% CGST + 9% SGST

CGST 9%
SGST 9%
SGST

State GST - Collected alongside CGST by the state government. Revenue goes to the state where the sale happened.

CGST 9%
SGST 9%
IGST

Integrated GST - Charged on transactions between two different states, and on imports. The central government collects it and sends the destination state's share. Charged at the full GST rate, not split.

Example: 18% inter-state GST = 18% IGST (no CGST or SGST)

IGST 18%
UTGST

Union Territory GST - Works exactly like SGST but applies in India's union territories: Chandigarh, Dadra and Nagar Haveli, Daman and Diu, Lakshadweep, Puducherry, Ladakh, and Andaman and Nicobar Islands.

Who Needs a GST Registration in India?

You are legally required to register for GST if your annual turnover crosses:

Rs. 40 lakh
if you supply goods

(Rs. 20 lakh in special category states)

Rs. 20 lakh
if you supply services

(Rs. 10 lakh in special category states)

Below the threshold, registration is optional. But many freelancers, consultants, and agencies register voluntarily, because their clients are GST-registered companies that need to claim Input Tax Credit (ITC) on the invoice. Without your GSTIN on the bill, they cannot claim ITC and may refuse to work with you.

Certain categories must register regardless of turnover: e-commerce sellers, businesses making inter-state supplies, and those liable under reverse charge.

Frequently Asked Questions on GST Calculator

Yes, completely free. No account, no subscription, no hidden charges. Enter your amount, select the rate, calculate.

Yes. This calculator is updated for GST 2.0 rates 0%, 5%, 18%, and 40% effective from September 22, 2025. The old 12% and 28% slabs are no longer available because they no longer exist in the tax law.

Multiply the base price by 0.18. A product at Rs. 5,000 attracts Rs. 900 as 18% GST, making the total Rs. 5,900. For intra-state: CGST = Rs. 450, SGST = Rs. 450. For inter-state: IGST = Rs. 900.

GST-exclusive means the quoted price does not include tax. Tax gets added on top. GST-inclusive means tax is already in the price useful for retail, where MRP is the final figure the buyer pays. Select the right option in the calculator to get accurate results.

No. The 12% slab was removed under GST 2.0, effective September 22, 2025. Items previously taxed at 12% have been moved to either 5% or 18% based on their category. Using 12% on invoices after this date is incorrect.

The 40% rate covers luxury and sin goods premium cars, motorcycles above 350cc, aerated drinks, certain tobacco products (post cess settlement), pan masala, casinos, online gaming with real money, horse racing, and lottery.

Most freelancers and independent consultants providing professional services charge 18% GST. Some specific educational and healthcare services are exempt. If you are unsure of your service category, check the SAC code on the GST portal or speak to a CA.

Yes. Enter the GST-inclusive figure in the Amount field, select "Inclusive," and choose the applicable rate. The tool separates the base price and the GST amount useful when calculating the tax component embedded in a price you have already paid.

ITC allows a GST-registered business to deduct the GST it already paid on business purchases from its outward GST liability. This prevents double taxation across the supply chain. To claim ITC, both parties must be GST-registered and the supplier must have filed their return correctly.

GST Compliance Beyond Calculation

Knowing the tax amount is the start. Staying legally compliant involves a few more things:

GST Return Filing

GSTR-1 (outward supplies) and GSTR-3B (summary return) are filed monthly or quarterly depending on turnover. Missing the deadline attracts late fees of Rs. 50 per day (Rs. 20 for nil returns).

E-Invoicing

Mandatory for businesses with turnover above Rs. 5 crore. Every invoice needs to be reported to the GST portal and carry an Invoice Reference Number (IRN) before it is issued.

Annual Return (GSTR-9)

Filed once a year, reconciling all monthly filings. Mandatory above Rs. 2 crore turnover.

Composition Scheme

Small businesses with turnover below Rs. 1.5 crore can opt for this scheme and pay GST at flat rates of 1%, 2%, 5%, or 6% depending on the business type, with simpler quarterly filing.

LegalDev handles all of this GST registration, monthly return filing, e-invoicing setup, and notice responses, through qualified CAs.

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