How a card EMI conversion is actually priced
The technique
GST on the interest component, every month
Issuers treat EMI interest as a service charge, and services attract 18 percent GST, billed monthly as a separate line under the EMI. Because it never appears in the quoted rate, people compare 15 percent on a card against 13 percent on a loan and think the gap is two points. It is closer to five.
Four things make up the price of a conversion, and only the first is on the screen when you tap convert.
The rate is applied on a reducing balance, exactly like a loan: each EMI pays some interest and some principal, and the interest shrinks as the principal comes down. The GST is 18 percent of that month's interest, so it shrinks too, but never reaches zero until the EMI does. The conversion fee is a one-time charge and carries GST as well. And the full principal is blocked against your limit on day one, released only as each instalment is paid.
Here is ₹60,000 over 12 months at an illustrative 15 percent, with a ₹199 conversion fee.
- Monthly EMI
- ₹5,415
- First month: interest ₹750, GST on it
- ₹135
- Interest over 12 months
- ₹4,986
- GST on that interest at 18%
- ₹897
- Conversion fee ₹199 plus GST
- ₹235
- All-in cost of the conversion
- ₹6,118
Reducing-balance EMI. The 15 percent rate and ₹199 fee are illustrative; your issuer's rate and fee are in its Most Important Terms and Conditions.
- The GST line alone is ₹897 on a ₹4,986 interest bill. Multiply any quoted card EMI rate by 1.18 to get the number you are actually comparing: 15 becomes 17.7, 18 becomes 21.24
- The fee is small in rupees and large in proportion on short tenures. On a 6-month conversion at 15 percent it is ₹235 of a ₹3,365 total, about 7 percent of the whole cost






