The Goods and Services Tax (GST) came into force on 1 July 2017, replacing a jumble of central and state indirect taxes with a single, nationwide tax on the supply of goods and services. Understanding GST begins with understanding what problem it solved.
What GST replaced
Before GST, India had a multi-layered tax system: Central Excise, Service Tax, VAT, Central Sales Tax, Octroi, Entry Tax, Purchase Tax, Luxury Tax, Entertainment Tax and more. Each was levied at different stages, with different rules and no unified credit mechanism. This created a 'tax on tax' or cascading effect, where you paid tax on the tax already embedded in the price.
GST unified most of these into a single tax structure, applying at each stage of the supply chain but allowing credit for tax paid at previous stages, thereby removing cascading.
The GST rate structure: 0/5/12/18/28%
GST classifies goods and services into five broad rate slabs based on necessity, luxury and policy goals:
| Rate | What it typically applies to |
|---|---|
| 0% (Nil) | Essential items: unpacked food grains, fresh milk, fresh vegetables, education, healthcare. |
| 5% | Common-use items: household necessities, packaged food, coal, medicines not otherwise exempt. |
| 12% | Standard processed goods: computers, processed foods, business-class air travel. |
| 18% | Most goods and services: soaps, toiletries, capital goods, IT services, telecom, restaurants. |
| 28% | Luxury and demerit goods: automobiles, premium consumer durables, aerated drinks, tobacco, cement. |
A few luxury or demerit goods in the 28% bracket also attract an additional cess (e.g., on tobacco, aerated beverages, or high-end cars) to fund compensation to states.
Why a multi-rate structure instead of one flat rate?
A single rate was debated, but India chose a multi-rate structure to balance revenue neutrality, protect low-income households, and meet constitutional commitments to compensate states. Essentials are taxed lightly or not at all; luxury and sin goods bear the highest rates. This structure is reviewed periodically by the GST Council.
The principle: a tax on value addition at every stage
GST is collected at every transaction in the supply chain — from manufacturer to distributor to retailer — but each business pays tax only on the value it adds, because it gets credit for the tax already paid on purchases. This is the input tax credit (ITC) mechanism, which breaks the cascading cycle.
GST removed the hidden 'tax on tax' by making the entire supply chain transparent and giving credit for every rupee of tax paid upstream. That is the core breakthrough.
What GST still does not cover
A few items remain outside GST and continue under older laws: petroleum products (petrol, diesel, ATF, natural gas), alcoholic liquor for human consumption, and real estate (stamp duty and registration remain separate). Electricity is also not taxed under GST.
Key takeaways
- GST unified over a dozen central and state taxes into one nationwide system.
- Five rate slabs — 0%, 5%, 12%, 18%, 28% — with a cess on a few luxury or demerit goods.
- The key innovation is input tax credit, which removes the cascading 'tax on tax' effect.
- Alcohol, petroleum, real estate and electricity remain outside the GST framework.
Official sources
This explainer is based on official and primary sources. Always confirm figures and dates on these before acting:
Reviewed: October 2026. Tax rules change — verify the current financial year and assessment year before you rely on any figure.
This is general educational information for Indian taxpayers, not personalised tax, legal or financial advice. Union of Taxpayers is an independent platform and not a government body. Consider a qualified professional for your specific situation.
Not professional advice
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