Riba al-nasi'ah (riba of delay) refers to the addition of any predetermined excess in a loan transaction β this is what we call interest in conventional finance, and is the primary form of riba prohibited in the Quran (2:275-279). Riba al-fadl (riba of excess) refers to the exchange of commodities of the same type in unequal quantities β for example, trading 10 gold coins for 12 gold coins. Both are prohibited in Islamic law, but riba al-nasi'ah is the form most relevant to modern finance.
This is a genuine scholarly debate. Critics argue that Islamic finance products β particularly Murabaha and some Musharakah structures β economically replicate interest by producing similar cash flows under different contractual labels. Proponents argue that the contractual structure matters for Islamic compliance regardless of economic equivalence, and that risk-sharing in true Musharakah genuinely differs from interest-based lending. Fair Meridian presents both perspectives. The AAOIFI and ISNA positions generally support the permissibility of properly structured products.
AAOIFI (Accounting and Auditing Organization for Islamic Financial Institutions) is an international standard-setting body based in Bahrain. It produces Sharia standards followed by Islamic financial institutions globally, particularly in the Gulf and Malaysia. ISNA (Islamic Society of North America) is a North American Muslim organization whose Finance House provides certification primarily for US-based Islamic finance providers. Both are credible certification bodies, but AAOIFI is more internationally recognized while ISNA has deeper roots in the North American Muslim community.
Sharia-compliant typically means a product has been structured to avoid specific prohibited elements (riba, gharar, maysir) and has received certification from a Sharia supervisory board. Sharia-based implies a deeper alignment with the spirit and objectives of Islamic law β including promoting equity, sharing risk genuinely, and serving social good. Critics of some Islamic finance products say they are Sharia-compliant (technically avoiding prohibited elements) but not truly Sharia-based (not embodying the ethical objectives of Islamic finance).