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What is GST?

GST (Goods and Services Tax) is an indirect tax levied on the supply of goods and services in India. It replaced multiple cascading taxes and is charged at each stage of the supply chain, with input tax credit available to registered businesses.

The tax you see on invoices is usually split as CGST + SGST for sales within the same state, or IGST for inter-state supplies. The combined rate depends on the product or service category.

How is GST calculated?

When the amount is exclusive of GST (add tax)

GST Amount = Taxable Amount × GST Rate ÷ 100

Total Amount = Taxable Amount + GST Amount

When the amount is inclusive of GST (remove tax)

Taxable Amount = Total Amount ÷ (1 + GST Rate ÷ 100)

GST Amount = Total Amount − Taxable Amount

Example: On a taxable value of ₹10,000 at 18% GST (exclusive), GST is ₹1,800 and the total is ₹11,800. If ₹11,800 is inclusive, the taxable value works out to ₹10,000.

GST rate slabs in India

Common GST rates applied on goods and services include:

5%: Essential items such as packaged food, transport services, and certain household goods.
12%: Processed foods, business-class air travel, and some construction materials.
18%: Most services, IT, telecom, and a large share of consumer products.
28%: Luxury goods, automobiles, cement, and aerated drinks (plus cess where applicable).

Some items are taxed at 0% or exempt. Always confirm the applicable rate for your specific HSN/SAC code.

CGST, SGST & IGST explained

For intra-state supplies (seller and buyer in the same state), GST is divided equally into CGST (Central GST) and SGST (State GST). Each is half of the total GST amount.

For inter-state supplies, the full GST is levied as IGST (Integrated GST) by the central government. The rate remains the same — only the split changes.

Intra-state: CGST = SGST = Total GST ÷ 2
Inter-state: IGST = Total GST
The total tax payable to the government is the same; only the collection mechanism differs.

How to use this GST calculator

1Choose Add GST if your amount is before tax, or Remove GST if your invoice total already includes tax.
2Enter the amount and select a GST rate (5%, 12%, 18%, 28%) or adjust the slider.
3Pick intra-state for CGST + SGST split, or inter-state for IGST.
4Review taxable value, tax components, and the final amount in the summary panel.

Frequently Asked Questions

Exclusive means the amount you enter is before GST — tax is added on top. Inclusive means the amount already contains GST, and the calculator works backwards to find the taxable value and tax portion.

Use CGST + SGST when the supplier and recipient are in the same state. Use IGST when the supply is inter-state. The total GST rate stays the same; only the split changes.

Select the rate applicable to your goods or service under GST law — commonly 5%, 12%, 18%, or 28%. If unsure, check your invoice, HSN/SAC code, or consult a tax professional.

GST is calculated on the taxable value of the supply — typically the price before tax when quoted exclusive, or extracted from the inclusive price when tax is embedded in the total.

This calculator covers standard GST rates. Additional compensation cess on certain goods (e.g. some sin/luxury items) is not included unless you add it to the rate manually.

Results use standard GST formulas and are rounded to the nearest paisa. For statutory filings and invoices, verify rates and rounding rules with your CA or GST portal.

Disclaimer

GST amounts shown are estimates based on the values and rate you enter. Actual tax liability depends on product classification, place of supply, exemptions, and applicable notifications. Bikesh Finserv does not provide tax advice. Consult a qualified chartered accountant or tax professional for compliance and filing.