ANSWER:

If the price is fixed and you are buying from the owner and there isn’t any way that the installments would increase more than what was agreed upon initially, this is permissible. But if there is a 3rd party that is doing the financing or the price would go up if you are late in payment or for any other reason, this is clear riba and prohibited. 

QUESTION: My question is that there is an app which allows you to pay in installments but then the price become slightly higher than the original price. Is it considered as interest too and is it impermissible?

Halal/Haram Matters, Riba |