Simple explanation
GST can be charged at multiple stages as goods or services move from a supplier to a customer. The important difference is input tax credit: a registered business may be able to offset eligible GST it paid on business purchases against GST collected on its sales, subject to the applicable rules and records. This reduces tax-on-tax cascading on the value added at each stage.
When you buy something within your own state, the tax is split into two equal parts: CGST (central government's share) and SGST (state government's share). When goods move between two states, a single IGST (integrated GST) is charged instead. As a shopper, you usually just see one combined "GST" line on your bill.
For example, if a business pays ₹180 GST on eligible inputs and later collects ₹360 GST on its sales, its input tax credit may reduce the amount it pays over to the government by the credit available under the applicable rules. Input tax credit is not an automatic cash refund and does not mean every purchase qualifies.
Why does it matter?
GST affects the price of almost everything you buy, from groceries to a haircut to a new phone. Understanding it helps you read a bill correctly, know why two similar shops might quote different "final" prices, and understand what a business means when it says a price is "plus GST" or "inclusive of GST."
Example
Here are simple illustrations, not permanent rate advice: for a ₹2,000 intra-state sale at an 18% example rate, CGST is 9% (₹180) and SGST is 9% (₹180), so the total is ₹2,360. For an inter-state sale at the same example rate, IGST is 18% (₹360), also making the total ₹2,360. If ₹2,360 already includes 18% GST, Base price = Inclusive price ÷ (1 + GST rate/100) = ₹2,360 ÷ 1.18 = ₹2,000, and GST = Inclusive price − Base price = ₹360. A simple invoice could show taxable value ₹2,000, CGST ₹180, SGST ₹180, and invoice total ₹2,360.
Rules and rates can change: These examples are for understanding the calculation only; check the current official treatment for a specific product, service or transaction.
Important things to know
- The applicable rate and classification depend on the specific goods or service; a familiar rate list is not a substitute for checking the current official position.
- CGST plus SGST generally applies to an intra-state supply, while IGST generally applies to an inter-state supply; the total rate may be the same when the taxable value and applicable rate are the same.
- Input tax credit depends on the applicable rules and supporting records. It is a mechanism for eligible business tax credits, not an automatic refund for every purchase.
- A GST invoice may include the supplier's GSTIN, invoice details, taxable value, applicable tax amounts and the total payable; exact requirements can depend on the transaction and current rules.
Common mistakes
- Comparing two prices without checking whether each one is GST-inclusive or GST-exclusive.
- Using an old rate or classification from an earlier bill without checking the current official position.
- Assuming that every business purchase automatically qualifies for input tax credit.
- Treating CGST, SGST and IGST as extra taxes stacked on top of one another instead of components of the applicable GST charge.
Frequently asked questions
Is the GST rate the same in every state?
GST rates are decided through the central GST framework and generally apply across India, but the correct rate and classification still depend on the particular goods or service and the rules in force.
Who actually pays GST — the buyer or the seller?
The buyer pays GST as part of the price. The seller collects it and is responsible for depositing it with the government.
Do I need a GST number to buy things as an individual?
No. A GSTIN is only needed by businesses that supply goods or services above the threshold set for registration. Everyday shoppers never need one.
What is input tax credit, in simple words?
It is a way an eligible registered business may offset GST paid on qualifying business purchases against GST collected on sales, subject to applicable rules and records. It helps reduce cascading, but it is not an automatic refund and not every purchase qualifies.
How do I calculate a GST-inclusive price?
To find the pre-tax amount, use Base price = Inclusive price ÷ (1 + GST rate/100). Then GST = Inclusive price − Base price. For ₹2,360 inclusive at 18%, the base is ₹2,000 and GST is ₹360.
What is the difference between CGST/SGST and IGST?
CGST and SGST are the two components generally used for an intra-state supply. IGST is generally used for an inter-state supply. They describe how the applicable GST is accounted for; they are not automatically extra taxes added on top of one another.
What should I look for on a GST invoice?
Look for details such as the supplier's GSTIN when applicable, invoice number and date, taxable value, the applicable tax amounts, and the total payable. Requirements can vary by transaction, so verify unusual cases with an official source.
How can I check the applicable GST rate?
Check the current GST Portal or other official government guidance for the product or service classification. Do not rely only on an old invoice, a generic rate list, or an online summary.
What happens when GST rates or classifications change?
The applicable rate or treatment for future supplies may change from the effective date in the relevant notification or guidance. Recheck current official information before pricing, invoicing or comparing amounts.
Related tools
Related guides
Official references
- GST Portal — Current taxpayer services, help topics and GST updates.
- CBIC GST — Central tax rules, circulars and official GST notices.
- GST Council — Council decisions and rate-related policy information.