When you make a large purchase on a credit card, the bank quickly follows up with an SMS or app notification: "Convert your transaction to EMI at 0% interest." It sounds like a free lunch. But zero-percent EMI schemes almost always have processing fees, and the regular EMI conversion — done outside promotional offers — can carry effective interest rates of 18–28% per annum.
How credit card EMI actually works
When you convert a transaction to EMI, the bank reduces your available credit by the total amount and recovers it in monthly installments over 3–24 months. The stated interest rate (usually 12–18% per annum) sounds comparable to a personal loan, but credit card EMIs are calculated on the original principal, not the reducing balance — making the effective rate significantly higher.
Example: A ₹60,000 purchase on 12-month EMI at 15% per annum interest. Stated monthly payment: ₹5,000 + ₹750 interest = ₹5,750. But since the principal reduces each month, the effective annual rate is closer to 27–28% in reducing balance terms.
The "0% EMI" offer
Genuine 0% EMI exists when a merchant subsidizes the interest as part of a product promotion (common on electronics and appliances at Croma, Vijay Sales, or during Amazon/Flipkart sales). The merchant pays the interest to the bank, and you pay only the principal. These are legitimately good deals — but always verify:
- Is there a processing fee? (Often ₹99–499, effectively ~1–2% of transaction)
- Is the product price inflated versus cash price? (Some merchants mark up the listed price and present the inflated price as the "0% EMI base")
- Does the EMI block your credit limit, preventing other purchases?
When EMI is justified
EMI makes sense when the alternative is worse: a personal loan at 18%+ from a bank, or a revolving balance at 3.5% per month (42% per annum). If you are otherwise going to carry a balance, EMI locks in a lower rate. But the best strategy is never carrying a balance at all.
The hidden danger: minimum due trap
Many cardholders pay only the "minimum amount due" on their statement — typically 5% of outstanding. The remaining 95% accrues interest at 36–42% per annum, compounded monthly. An unpaid balance of ₹50,000 at 3.5% monthly becomes ₹100,000 within two years. Always pay the full statement balance every month.