What Is GST (Goods and Services Tax) in India?

GST (Goods and Services Tax) is India's single indirect tax on the supply of goods and services, administered jointly by the Central and State governments and supported by the official portal gst.gov.in. It replaced a patchwork of earlier indirect taxes and is structured as a destination-based, multi-stage tax on value added, with input tax credit (ITC) available to registered businesses. This explainer covers what GST is, how the mechanism works, who runs it, and how the main rate structure is organized.

The core idea: a destination-based, multi-stage tax on value added

GST is levied at each stage of the supply chain — from manufacture or import, through distribution, to the final sale to the consumer — but it is designed to tax only the value added at each stage. The mechanism that makes this work is input tax credit: a registered business can offset the GST it has already paid on its purchases against the GST it collects on its sales, and remits only the difference.

Two features follow from this design:

• Destination-based. Tax accrues to the jurisdiction where the final consumption occurs, not where the goods were produced. In practice, this is why the framework distinguishes intra-state supplies (CGST + SGST) from inter-state supplies (IGST).
• Multi-stage with credit. Because credit flows through the chain, the tax is not meant to cascade. The effective burden should approach the rate applied at the final stage, rather than compounding at every hop.

A simple illustration: a manufacturer buys inputs on which ₹100 of GST has been charged, produces goods, and sells them with ₹180 of GST on the invoice. The manufacturer remits ₹80 (₹180 minus ₹100) and passes the ₹100 credit along. The final consumer bears the full ₹180, and the tax has been collected in instalments along the chain rather than all at once.

Who administers GST and what gst.gov.in is for

GST in India is a joint central–state framework: the Central Government and the State Governments each levy their components, which is why intra-state supplies carry both CGST and SGST. The official portal, gst.gov.in, is the government's central online entry point for GST. Its published materials describe it as the Goods and Services Tax portal of the Ministry of Finance, Government of India.

The portal is where the operational side of GST lives — registration, returns, and payments. Its payment section links to practical tools such as:

• Electronic Cash Ledger — the account that holds deposits used to pay tax and other dues
• Create Challan — generating a payment challan
• Challan History and Saved Challans — tracking and reusing past challans
• Track Payment Status — checking whether a payment has been processed
• Payment towards Demand — paying amounts raised in a demand
• Instalment Calendar — viewing instalment schedules

If your task is to register, file, or pay, gst.gov.in is the authoritative starting point rather than any third-party summary.

How GST differs from the earlier indirect tax system

Before GST, India's indirect tax landscape was split across separate levies — for example, central excise on manufacture, service tax on services, and state-level VAT on sales — each with its own base, registration thresholds, and credit rules. That structure created cascading and boundary problems: credit often could not be carried cleanly across tax types or across state lines.

GST consolidated these into one tax on supply, with a common credit mechanism and a unified treatment of intra-state versus inter-state transactions. The practical differences readers usually care about:

Rate structure and exempt categories

GST operates through a set of rate slabs rather than a single rate, with certain goods and services exempt or outside the tax. The specific slab rates and the list of exempt items are set by the GST Council and updated from time to time, so the reliable approach is to check the current schedule on gst.gov.in or the CBIC materials rather than rely on a remembered figure.

What is stable enough to state generally:

• Multiple slabs apply, so the rate depends on the classification of the specific good or service — not on the size of the transaction.
• Some supplies are exempt or nil-rated, and some are outside GST altogether; the classification determines which.
• Classification drives everything: the HSN code for goods or SAC code for services is what ties a supply to its rate.

If you need the rate for a specific item, the practical sequence is: identify the correct HSN/SAC classification, then check the current rate schedule for that classification. A rate quoted in an older article or a generic table is a common source of error.

Where to go next

• To register, file returns, or pay, start at gst.gov.in and use its registration, returns, and payment sections.
• To verify a rate, confirm the HSN/SAC classification first, then check the current schedule.
• To understand a specific transaction's treatment — intra-state vs inter-state, credit eligibility, place of supply — the answer depends on facts about the supply, and the portal's published guidance and the GST law are the reference points.

GST is best understood not as a single tax rate but as a system: one taxable event (supply), one credit chain, and a rate that follows classification. Once that structure is clear, most practical questions reduce to identifying the supply and its classification.