Advertised as '0% Interest', but you end up paying 15% more. We decode the hidden math of Processing Fees, GST on Interest, and the biggest trap of all: The Lost Cash Discount.

You see a shiny new iPhone 16. Price: ₹80,000. You don't have ₹80,000. But Amazon says: "No Cost EMI! Pay just ₹13,333/month for 6 months."
Math check: ₹13,333 x 6 = ₹79,998. Wow! It's effectively free money! The bank is giving me a loan for free!
Stop. Banks are not charities. They don't lend money for free. If you are not paying the interest, someone else is. And usually, that "someone" finds a way to take it back from you.
Let's decode the First Principles of the "No-Cost EMI" Scam.
RBI banned "0% Interest Loans" in 2013. So, how does Amazon/Flipkart still offer it? Loophole: They give you an "Upfront Discount" equal to the interest amount.
Example: Product Price ₹50,000 (6 Months Tenure)
Consumer thinks: "I paid ₹50k, product was ₹50k. Net Zero." But here comes the Taxman.
You only see the EMI amount. You don't see the Bank Statement. The Government of India charges 18% GST on Financial Services (Interest).
Even though the "Interest" was technically covered by the discount, YOU still have to pay GST on that interest component.
Who pays this? You do. It is added to your credit card statement quietly.
Banks charge a "Processing Fee" for setting up the EMI.
Total Extra Cost so far: ₹396 (GST) + ₹235 (Proc Fee) = ₹631. Still manageable, right? Wait for the big one.
This is the Elephant in the Room. Merchants subsidize the interest (pay the bank) to make the sale. Where does that money come from? It comes from the margin they would have otherwise given YOU as a cash discount.
The "Opportunity Cost" Math:
The Comparison:
You thought you got a 0% loan. You actually took a 20% loan.
When should you use No-Cost EMI?
The Final Word: "No-Cost" is a marketing term, not a financial term. Always calculate: (Total EMI Payments + Processing Fee + GST) - (Cash Price with Discounts). If the difference is positive, you are paying interest.
Amodh is a personal finance educator and the founder of KnowYourFinance. With a deep understanding of Indian taxation and investment products, he simplifies complex financial concepts to help young Indians build wealth safely.
Editorial Disclosure: The author holds investments in broad-market index funds and SGBs. This article is strictly for educational purposes and does not constitute professional investment advice. KnowYourFinance maintains complete editorial independence.
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