It does not work this way:
a.) GST is not for seller to keep, so it is not going to happen that GST charged by bank will be returned back to seller.
b.) All financial charges attract GST@18%. Be it
normal EMI or
No Cost EMI or
EMI for loan taken on card, GST will always be charged on interest component. Even Processing Fee or Late payment Fee attracts GST @18%.
c.) GST varies from product to product, so if you calculate with product purchased on GST less than 18% you will always get a deficit.
Note: I am not a GST expert, some one from the field can chime in to share more details or make corrections.
I am sharing three calculations (refer snippets)
1. from my actual purchase, here I got Instant discount and NC EMI discount
2. derived from [1], I only removed the Additional discount to reflect the actual use case discussed here
3. Used same as [2] but changed GST rate to 10% to emphasize on point [
c] mentioned above
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