Kafalah

A guarantee or surety contract in Islamic law. A third party (kafil) assumes responsibility for the financial obligations of another party (makful anhu) if that party defaults. Traditionally, kafalah should be provided as a charitable act without a fee.

However, modern Islamic finance has debated whether fees for guarantees are permissible. Kafalah is used in Islamic banking for letters of credit, bank guarantees, and performance bonds. Some scholars distinguish between personal guarantees (kafalah bil-nafs) and financial guarantees (kafalah bil-mal).

Kafalah is suretyship — one party joins their liability to another's, promising the creditor performance if the principal debtor defaults. It is the fiqh framework for co-signing, guarantees, letters of credit, and bail-style undertakings, treated classically as an act of benevolence (the Prophet said 'the guarantor is liable,' Abu Dawud/Tirmidhi) rather than a business line.

That charitable classification produces the doctrine's central modern rule, codified in AAOIFI's guarantee standard: charging a fee for the bare act of guaranteeing is impermissible in the majority view, because it amounts to selling credit risk — the same objection that fells conventional guarantee fees, standby LC commissions priced as a percentage of exposure, and credit default swaps. Islamic banks work within the rule by charging only documented administrative costs on guarantees, or by restructuring the service as agency (wakalah) with a fee for real work performed.

For American Muslims the doctrine surfaces most concretely in co-signing: guaranteeing a relative's halal home financing or apartment lease is permissible and meritorious, but co-signing an interest-bearing loan is widely held impermissible — not because guaranteeing is wrong, but because it facilitates and legally obligates you to a riba contract. Kafalah also underpins Takaful mechanics, where mutual guarantee among participants replaces the sold indemnity of conventional insurance.