Buy a bar of soap. Book a hotel room. Split a restaurant bill with friends. Every one of those handovers quietly carries a slice of Goods and Services Tax, which makes GST the tax most Indians actually pay most often. And yet the logic underneath it — why one product is taxed lightly and another gets clobbered — almost never gets explained.

What follows is that logic, the plumbing rather than the price list. It is deliberately not a table of today’s rates. Those move often, and the only sensible place to read them is at source.

One tax to replace many

GST came into force on 1 July 2017. Picture the mess it replaced. Before that date a single purchase could be dragged through a tangle of separate levies — central excise duty, service tax, state value-added tax, octroi, entry tax, and more besides. Worse, these taxes stacked. A business often ended up paying tax on tax, and the price you finally paid carried hidden layers of the stuff baked in.

The reform folded most of those indirect taxes into one structure that runs across the whole country. Someone coined a slogan for it — “one nation, one tax” — and it stuck. In practice GST is destination-based, which is a small phrase doing real work: the revenue flows to the state where a good or service is finally consumed, not the state where it happened to be made.

The four-way split of every rupee

India is a federation, so a national consumption tax has a problem to solve before it collects a single rupee. How do the Centre and the states share the take? GST answers with a set of components most people never register on a bill:

  • CGST — Central GST, collected by the central government on sales within a state.
  • SGST — State GST, collected by the state government on those same within-state sales.
  • IGST — Integrated GST, charged when goods or services cross state lines, then apportioned later between the Centre and the destination state.
  • UTGST — the equivalent of SGST for Union Territories that lack their own legislatures.

So a purchase inside your own state is typically CGST plus SGST. An interstate one carries IGST. Here’s the part worth internalising: the total rate is identical either way. The only thing that changes is how the money gets divided behind the scenes. You pay the same.

Slabs: why the rate depends on what you buy

GST doesn’t tax everything at one flat percentage. Goods and services are sorted into slabs, and roughly speaking, the more essential an item is judged to be, the lighter the rate it attracts. On top of those main slabs, a compensation cess is levied on a narrow set of goods — tobacco products, certain motor vehicles. Precious metals such as gold sit at their own concessional rate rather than a standard slab.

Which brings us to the reason this article names no figures. The exact percentages, and which product lands in which slab, are revised periodically and can shift after any meeting of the GST Council. Quote a rate today and it may be wrong by next quarter. So don’t take it from an article. To confirm the rate on a specific item, the authoritative reference is the Central Board of Indirect Taxes and Customs (CBIC), which publishes the notified rate schedules.

Who decides the rates: the GST Council

Now for the genuinely unusual bit. No single government controls GST. Not the Centre, not any one state. Rates, slabs, exemptions, and rules are set by the GST Council, a constitutional body created under Article 279A. It is chaired by the Union Finance Minister and seats the finance ministers of every state and Union Territory that has a legislature.

Decisions need a weighted majority, not a simple central diktat. The practical upshot is that the states, collectively, hold a large share of the vote — enough that the Centre cannot simply impose its will. The design forces negotiation. And it is exactly why changes to GST land as announcements after a Council meeting, rather than as a line item in one ministry’s order.

Input tax credit: the mechanism that stops tax on tax

If GST has a beating heart, this is it. The feature that sets it apart from the old regime is input tax credit. When a registered business buys materials or services to make its own product, it pays GST on those inputs. Later, it can subtract that already-paid tax from the GST it owes on its own sales, and hand the government only the difference.

Follow a chain from raw material to finished product. At every link, tax is charged on the full value — but credit is given back for the tax already paid earlier down the line. Net it all out and the tax falls only on the value added at each stage. The final consumer bears it once, cleanly, instead of several times over in compounding layers. That, in one paragraph, is why GST was expected to kill the old cascading of taxes.

Who has to register

Not every seller is inside the net. Businesses below a certain turnover threshold are exempt from registration, and that threshold isn’t a single number — it differs for goods versus services, and for some special-category states. Small businesses have another option too: the composition scheme, which lets them pay a low flat rate on turnover and file simpler returns, in exchange for giving up the right to claim input tax credit. A trade-off, in other words. Larger businesses register normally, charge GST on their invoices, and file periodic returns spelling out what they collected and what credit they’re claiming.

How to read a GST bill

A proper tax invoice tells you far more than the total at the bottom. It should carry the seller’s GST Identification Number (GSTIN), a description of the goods or services with their HSN or SAC classification code, the taxable value, and the tax broken out into CGST and SGST — or IGST if the sale crossed a state line. If you are buying for a registered business, that invoice is the document that lets you claim input credit. Which is precisely why correct invoicing is treated as such a big deal within the system.

Filing and the digital backbone

GST runs almost entirely online, through the GST portal, operated with support from the Goods and Services Tax Network. Registration, return filing, tax payment, refund claims — all of it flows through that platform. The system is built on a simple, demanding idea: a buyer’s claimed credit should match a seller’s declared sale. Much of what businesses call “compliance” is really just reconciling those two records against each other.

The bottom line for a shopper

Strip it back to what a consumer actually needs to hold in their head, and it’s short. The rate you pay is set collectively by the Centre and the states — never by the shopkeeper. It varies with how essential a product is judged to be. And the CGST, SGST, or IGST split printed on your bill is about who gets the revenue, not about charging you extra. When you need the precise, current rate on something, go to the official CBIC schedules rather than trusting a figure that may already have moved.

For more plain-English explainers on how money and policy actually work in India, see our Business section.