Fiqh al-Bay' al-Salam — Advance Payment Sales in Islamic Law: The Permissible Exception to the Prohibition of Selling What You Do Not Yet Own

The Core Structure

In bay’ al-salam:

• The buyer (rabb al-salam / muslim) pays the full purchase price immediately (ra’s al-mal)
• The seller (al-musallam ilayh) commits to delivering a specified, described commodity at a future date
• The commodity (al-musallam fih) must be precisely described: type, grade, quantity, and quality

This is the opposite of a deferred-payment sale (bay’ mu’ajjal): in bay’ al-salam, it is the price that is paid immediately while the goods are deferred.

Why It Is Permitted

Islamic law generally prohibits selling what you do not possess (bay’ ma laysa ‘indak). Bay’ al-salam appears to violate this: the seller commits to deliver goods he does not yet have. The jurists explain the permission on three grounds:

1. Prophetic authorization: the Prophet explicitly permitted it with conditions
2. Certain description eliminates gharar: because the goods are precisely specified, the uncertainty (gharar) that makes other forward contracts forbidden is minimized
3. Economic necessity: the advance payment serves the seller’s capital needs; this benefit justifies the exception

The Conditions (Ibn Qudama’s Summary)

1. The commodity must be describable with precision such that disputes can be resolved
2. The price (ra’s al-mal) must be paid fully in the contract session — deferred advance payment is not permitted
3. The delivery date must be specified
4. The commodity must normally be available in the market at the delivery date

See also: Fiqh Al Musharakah, Fiqh Al Ghurm Wa Ghanm, Fiqh Al Ijarah, Fiqh Al Tawkil, Fiqh Al Wasatiyyah