What is the ruling on purchasing a car through an interest-based bank via installment payments, and is the subsequent poor financial condition following the purchase evidence of the impermissibility of this transaction?

The aforementioned transaction is impermissible because the husband is committed to paying interest if he delays payment. He must repent to Allah and pay the installments on time to avoid paying usurious interest. What was obligatory upon him was to inquire about the ruling on the transaction before entering into it.