No cost EMI calculator

The interest is recovered by amortization, not read off the offer: the discount structure amortizes the cash price at the lender rate, the inflated structure amortizes the even instalment backwards to the principal it retires. GST on interest follows the instrument: credit card EMI interest attracts GST, consumer loan and cardless EMI interest is exempt per CBIC circulars, so a card plan refunded in full still leaves the GST and the processing fee as real cost. The schedule assumes even instalments and a rate that never steps down. Merchant cashback, insurance add-ons, and auto-debit failures are outside this model.