Interest Rate
Synonyms: Borrowing Rate، Cost of Borrowing، Policy Rate (for central bank rates)
Last updated: 2026-09-25
Short Definition
An interest rate is the cost of borrowing money expressed as an annual percentage of the amount borrowed; it is set in the market under the influence of the central bank's policy rates, interbank lending costs and the borrower's risk, so central banks do not set it directly for individuals.
Overview
Legal Basis
The central bank's role in interest rates rests on the Saudi Central Bank Law issued by Royal Decree No. M/36 dated 11/4/1442H, which replaced the name "Saudi Arabian Monetary Agency" with "Saudi Central Bank" and made monetary stability one of its objectives. In home finance, Article 9 of the Implementing Regulation of the Real Estate Finance Law requires disclosure of any reference rate and the conditions for changing the term cost, and the Responsible Lending Principles (Article 13) require lenders to add a margin when calculating variable-rate obligations and to reschedule repayments if the deduction ratio exceeds the limit because of a change in term cost.
Practical Example
An employee in Riyadh can allocate about SAR 5,300 a month to a mortgage installment within deduction limits. When market finance costs were about 5%, the installment on SAR 900,000 over 25 years was about SAR 5,261.31, within his capacity. If costs rose to 6%, the installment on the same amount would be about SAR 5,798.71, roughly SAR 537 a month and SAR 161,221 over the term more, and to stay at a SAR 5,300 installment he could only borrow about SAR 77,000 less. This shows how interest-rate decisions pass, through interbank liquidity and lender pricing, into household purchasing power and housing demand.
Common Mistakes
- ✗Believing the central bank sets the interest rate on individual loans, when it sets policy rates and each lender prices its own products.
- ✗Assuming Islamic finance structures are unaffected by interest rates, although their pricing is economically linked to market rates and benchmarks such as SAIBOR.
- ✗Confusing the repo rate (central bank lending to banks) and the reverse repo rate (bank deposits with it) with the customer's finance rate.
- ✗Taking variable-rate finance in a low-rate period without calculating the effect of later rises on the installment.
- ✗Expecting property prices to fall automatically when rates rise, although prices also depend on supply, government support and regulation.
International Differences
In most countries the central bank sets an independent key rate targeting inflation, as in Egypt and Turkey, where rates move sharply with inflation and exchange rates, making mortgage installments very volatile. The UAE and Saudi Arabia peg their currencies to the dollar, so their policy rates usually follow the US Federal Reserve. In the US, the 30-year fixed mortgage rate tracks long-term bond yields more than the Fed's short-term rate.
