GST Is Collected at Every Step, Yet Only the Last Buyer Really Pays It
Calculate input tax credit and net GST at each stage from manufacturer to retailer, find the total GST reaching the government, fill in a GST invoice with items at different rates, and solve problems that combine discount, profit and GST.
How does GST work when goods pass through several hands?
A packet of biscuits passes from a manufacturer to a wholesaler, then a retailer, then you. GST is charged at every sale. If each seller simply added tax on top of tax, prices would balloon. Input tax credit prevents this.
Output GST is collected on sales; input GST was paid on purchases. This part covers net GST at each stage, the total GST reaching the government, invoices and combined problems.
Output GST is collected on sales; input GST was paid on purchases. This part covers net GST at each stage, the total GST reaching the government, invoices and combined problems.
How do you compute input tax credit and net GST payable at each stage of a supply chain?
At each stage, a dealer collects output GST on the sale, subtracts the input GST already paid on the purchase as input tax credit, and pays only the difference to the government.
Worked example. All sales are within one state and GST is .
Stage 1 — manufacturer sells to wholesaler for ₹10000.
Stage 2 — wholesaler sells to retailer for ₹12000.
Stage 3 — retailer sells to consumer for ₹15000.
CGST and SGST are each half the net GST: ₹600, ₹120 and ₹180 at the three stages.
An everyday example. A kirana shop owner registered for GST claims credit for the tax paid to suppliers and pays only the difference on sales.
The substance. Net GST at each stage equals the rate applied to the value added: .
Worked example. All sales are within one state and GST is .
Stage 1 — manufacturer sells to wholesaler for ₹10000.
Stage 2 — wholesaler sells to retailer for ₹12000.
Stage 3 — retailer sells to consumer for ₹15000.
CGST and SGST are each half the net GST: ₹600, ₹120 and ₹180 at the three stages.
An everyday example. A kirana shop owner registered for GST claims credit for the tax paid to suppliers and pays only the difference on sales.
The substance. Net GST at each stage equals the rate applied to the value added: .
How do you find the total GST deposited with the government across the whole chain?
Add the net GST paid at every stage; the total always equals the GST the final consumer pays on the last selling price.
Continuing the example:
Check against the consumer's bill:
So the consumer effectively bears all the tax, while each dealer only passes it along.
Split between governments: CGST and SGST .
Without input tax credit, each dealer would pay the full output GST:
That is ₹2640 more — tax charged on tax, called the cascading effect, which GST is designed to remove.
An everyday example. Two identical shirts bought from shops with different numbers of middlemen carry the same total GST at the same final price, because every middleman's tax is credited.
The link. This total is the output GST of the last sale, so a quick check is always possible.
Continuing the example:
Check against the consumer's bill:
So the consumer effectively bears all the tax, while each dealer only passes it along.
Split between governments: CGST and SGST .
Without input tax credit, each dealer would pay the full output GST:
That is ₹2640 more — tax charged on tax, called the cascading effect, which GST is designed to remove.
An everyday example. Two identical shirts bought from shops with different numbers of middlemen carry the same total GST at the same final price, because every middleman's tax is credited.
The link. This total is the output GST of the last sale, so a quick check is always possible.
How do you complete a GST invoice with items charged at different rates?
Work each item separately — quantity times rate, less discount, then GST at that item's own rate — and add the rows to get the total taxable value, total GST and amount payable.
Worked invoice (intra-state):
Item A — pieces at ₹850, discount , GST
Item B — pieces at ₹400, discount , GST
Item C — pieces at ₹120, no discount, GST
Totals:
An everyday example. A supermarket bill lists each item with its own GST rate before adding everything up.
The substance. Never apply one average rate to the whole invoice; each item's tax must use its own rate.
Worked invoice (intra-state):
Item A — pieces at ₹850, discount , GST
Item B — pieces at ₹400, discount , GST
Item C — pieces at ₹120, no discount, GST
Totals:
An everyday example. A supermarket bill lists each item with its own GST rate before adding everything up.
The substance. Never apply one average rate to the whole invoice; each item's tax must use its own rate.
How do you solve word problems combining discount, profit and GST?
Follow the goods stage by stage: apply the discount to get each selling price, charge GST on it, subtract the input tax credit, and finish with the consumer's price and any profit asked for.
Worked example. An air cooler has a list price of ₹20000. GST is .
- Manufacturer to wholesaler at discount
- Wholesaler to retailer at discount
- Retailer to consumer at the list price
Consumer pays:
Total GST to government:
Retailer's profit:
An everyday example. An appliance dealer in Jaipur buying at a trade discount and selling at the printed price follows exactly this chain.
The substance. GST does not change the retailer's profit, because the tax paid on purchase is recovered as input tax credit.
Worked example. An air cooler has a list price of ₹20000. GST is .
- Manufacturer to wholesaler at discount
- Wholesaler to retailer at discount
- Retailer to consumer at the list price
Consumer pays:
Total GST to government:
Retailer's profit:
An everyday example. An appliance dealer in Jaipur buying at a trade discount and selling at the printed price follows exactly this chain.
The substance. GST does not change the retailer's profit, because the tax paid on purchase is recovered as input tax credit.
Exam tip
What earns full marks on input tax credit and invoices?
Set out every stage in the same order — selling price, output GST, input tax credit, net GST — and check the total against the final consumer's GST.
- Label each stage clearly
- Write input tax credit as the previous stage's output GST
- Split net GST into CGST and SGST where asked
- For invoices, calculate each item on its own line
- Keep paise to two decimal places
- Verify: total net GST equals GST on the last selling price
The trap. Adding the output GST of every stage as the total paid to the government. Only the net amounts add up to the true total.
- Label each stage clearly
- Write input tax credit as the previous stage's output GST
- Split net GST into CGST and SGST where asked
- For invoices, calculate each item on its own line
- Keep paise to two decimal places
- Verify: total net GST equals GST on the last selling price
The trap. Adding the output GST of every stage as the total paid to the government. Only the net amounts add up to the true total.
Did you know
What does the 15-character GSTIN printed on a bill tell you?
Every GST-registered business prints a 15-character GSTIN on its bills. It is not a random code.
- First 2 digits — the state code where the business is registered
- Next 10 characters — the business's PAN
- 13th character — the entity number for that PAN in the state
- 14th character — usually the letter Z
- 15th character — a check character that catches typing errors
So from the first two digits alone, you can tell which state the seller belongs to — and whether your bill should show CGST and SGST or IGST.
- First 2 digits — the state code where the business is registered
- Next 10 characters — the business's PAN
- 13th character — the entity number for that PAN in the state
- 14th character — usually the letter Z
- 15th character — a check character that catches typing errors
So from the first two digits alone, you can tell which state the seller belongs to — and whether your bill should show CGST and SGST or IGST.
Exam relevance
Does input tax credit appear in JEE Main, or only in the ICSE board exam?
Input tax credit and GST invoices are not part of the JEE Main syllabus; they belong to the Class 10 ICSE board exam, usually as long multi-step problems.
What carries forward. Organising a problem into stages, keeping a running total and checking a result by a second route — here, total net GST against the consumer's GST — is the same discipline used in multi-step numericals in Class 11 Sequences and Series, a JEE Main chapter.
Board versus competitive emphasis. The board paper gives marks for each correct stage; competitive exams reward spotting shortcuts, such as net GST being the rate times the value added.
The trap that costs marks. Forgetting to subtract input tax credit and reporting output GST as the amount payable.
What carries forward. Organising a problem into stages, keeping a running total and checking a result by a second route — here, total net GST against the consumer's GST — is the same discipline used in multi-step numericals in Class 11 Sequences and Series, a JEE Main chapter.
Board versus competitive emphasis. The board paper gives marks for each correct stage; competitive exams reward spotting shortcuts, such as net GST being the rate times the value added.
The trap that costs marks. Forgetting to subtract input tax credit and reporting output GST as the amount payable.
Key takeaways
What must you be able to do from this part?
- Net GST output GST input GST
- **Stages at : ₹10000, ₹12000, ₹15000 give net GST ₹1200, ₹240, ₹360
- Total GST** GST on the final price
- Without credit, tax would be ₹4440 — the cascading effect
- Invoice: each item taxed at its own rate; total payable ₹3688.80 in the example
- Combined problem: consumer pays ₹23600; government gets ₹3600; retailer's profit ₹2000
Try making up a three-stage chain of your own with a rate and check that the net amounts add up to the consumer's GST.
- **Stages at : ₹10000, ₹12000, ₹15000 give net GST ₹1200, ₹240, ₹360
- Total GST** GST on the final price
- Without credit, tax would be ₹4440 — the cascading effect
- Invoice: each item taxed at its own rate; total payable ₹3688.80 in the example
- Combined problem: consumer pays ₹23600; government gets ₹3600; retailer's profit ₹2000
Try making up a three-stage chain of your own with a rate and check that the net amounts add up to the consumer's GST.