If you spend any time around Islamic finance, you will hear one word again and again: riba. So, what is riba? In short, it is an unjustified increase that Islamic law prohibits. In everyday finance, the word is most often used for interest charged on a loan.
This post explains where the prohibition comes from, the main types of riba, the reasoning behind it, and how it shapes the way Muslims in the UK think about saving and borrowing.
What is riba in Islamic law?
The Arabic word riba literally means "increase" or "excess". In Islamic law it refers to an increase arising from a loan or an exchange without a recognised, lawful basis.
The classic example is a loan where the borrower must repay more than they received, simply because time has passed. Scholars across the mainstream schools agree that this is riba.
AAOIFI's Shariah Standards follow this reasoning. A loan (qard) is treated as an act of kindness: the lender should get back what they lent and nothing more. Any condition that gives the lender a benefit because of the loan falls into riba.
What do the Qur'an and hadith say?
The Qur'an states the prohibition plainly. In Surah al-Baqarah (2:275), it says that Allah has permitted trade and forbidden riba. Islam encourages trade and enterprise, and it separates them from taking an increase on money lent.
A well-known narration in Sahih Muslim, reported by Jabir ibn Abdullah, says that the Prophet ﷺ cursed the one who consumes riba, the one who pays it, the one who records it and the two witnesses to it, saying they are all alike. Scholars read this as a sign of how seriously the matter is taken. It touches everyone involved, not only the lender.
What are the main types of riba?
Classical scholars usually describe two main categories.
- Riba al-nasi'ah (riba of delay) is an increase on a loan or debt in return for time. It covers the pre-Islamic practice of "pay now, or pay more later", and it is the form most closely linked with modern interest.
- Riba al-fadl (riba of excess) arises when certain goods are exchanged for the same kind of good in unequal amounts, or without hand-to-hand settlement. A hadith in Sahih Muslim, narrated by Ubadah ibn al-Samit, mentions gold, silver, wheat, barley, dates and salt. Like must be exchanged for like, in equal measure and hand to hand. If the kinds differ, the amounts may differ, but the exchange must still be hand to hand.
Riba al-fadl matters today for currency exchange and the trade of gold and silver, where scholars apply its rules in detail.
Why is riba prohibited?
The texts give the ruling itself. Scholars have also reflected on the wisdom behind it. These are explanations, not extra rulings.
- Fairness and shared risk. A well-known legal maxim, often translated as "gain comes with liability", says that a gain should be linked to real risk or real work. A fixed increase on a loan, whatever happens to the borrower, separates the two.
- Protection of the vulnerable. Compounding debt can hit people in hardship hardest. The Qur'an (2:280) encourages giving a struggling debtor more time, and says that forgiving the debt is better still.
- Money as a medium, not a product. In the classical view, money is a means of exchange and a store of value, not something to be traded for more of itself.
- Connection to the real economy. Islamic finance aims to tie financial activity to real assets, services and trade.
How does Islamic finance work without interest?
Islamic finance uses structures based on trade, leasing and partnership. In general terms:
- Murabaha is a sale where the seller discloses the cost and a profit margin, and the buyer pays later, often in instalments.
- Ijara is leasing: the financier owns the asset and charges rent for its use.
- Musharaka and mudaraba are partnerships where profit is shared in agreed proportions and losses follow the capital invested.
- Sukuk are certificates representing ownership in assets, rather than a claim on a debt.
- Qard hasan is a benevolent loan, repaid in the same amount.
The difference is not a change of wording. Scholars look at whether the structure is real: who owns the asset, who bears the risk, and when. A contract that merely relabels an interest-bearing loan is not accepted by mainstream scholars.
What does riba mean in everyday UK life?
In the UK, interest appears in savings accounts, overdrafts, credit cards, personal loans and conventional mortgages. Muslims who wish to avoid riba look at each of these in turn.
On the borrowing side, Islamic alternatives to the conventional mortgage are usually based on leasing or diminishing partnership. On the saving side, some products use profit-sharing or trade-based structures. Late-payment charges also draw attention. AAOIFI's standards allow a penalty on a debtor who deliberately delays payment only if it goes to charity and is not kept as the lender's income.
When someone has received interest, many scholars advise giving that amount to charitable causes, with the intention of ridding oneself of it rather than seeking a reward. This is often called purification. The details depend on circumstances, so personal questions are best put to a qualified scholar.
Where do scholars differ?
On the core question there is broad agreement. The great majority of contemporary scholars and Shariah bodies, including AAOIFI, treat conventional interest on loans as riba. Differences appear in the details.
- Modern minority views. A small number of modern writers have argued that the prohibition covers only exploitative or compounding lending. This view has been widely rejected by Shariah boards and most scholars.
- Mortgages in non-Muslim countries. Some contemporary scholars have allowed conventional mortgages in cases of genuine necessity where no Islamic alternative exists. Most hold that the prohibition remains and that necessity is a strict test.
- Debts and inflation. Scholars discuss whether debts may be linked to an index or price level. Many do not allow it, reasoning that it could bring back a built-in increase on a loan.
Learning more and taking advice
Understanding riba is the foundation of Islamic finance. Topics such as Shariah screening of shares and halal home finance all build on it. The AAOIFI website (https://aaoifi.com) publishes information on its standards, and MoneyHelper (https://moneyhelper.org.uk) offers free, impartial guidance on everyday money matters in the UK.
This post is general education, not personal advice. For your own affairs, such as an existing loan, a mortgage or interest you have received, ask a qualified scholar. Where money decisions are involved, a regulated financial adviser can help you understand your options.
Frequently asked questions
Is all interest riba?
Mainstream scholars and AAOIFI's standards treat interest on loans, where the lender receives a set increase because of the loan, as riba. A few modern writers have argued for a narrower definition, but most scholars do not accept it.
Is riba the same as profit?
No. Profit in Islamic finance comes from trade, leasing or partnership, where the earner bears real risk or does real work. Riba is an increase on a loan or an unequal exchange. The difference lies in the structure and the risk, not just the name.
What should I do with interest I have received?
Many scholars advise giving it to charitable causes without expecting a reward, rather than keeping it. Opinions vary on the details, so ask a qualified scholar about your own situation.
Does riba only apply to money lent?
No. Riba al-nasi'ah covers the increase on loans and debts, while riba al-fadl covers the exchange of certain goods, including gold and silver, in unequal amounts or without hand-to-hand settlement.