Rates
What is the difference between flat and reducing interest rates?
A reducing-balance rate charges interest only on the outstanding loan balance, so interest falls as you repay — this is how virtually all UAE mortgages work. A flat rate charges interest on the original loan amount for the whole term, common in some personal or car loans, and results in a much higher effective cost for the same headline rate.
How reducing-balance interest works
With a reducing-balance mortgage, each monthly payment is split between interest and principal. Interest is calculated on whatever balance remains at that point, so as you pay down the loan, the interest portion shrinks and more of each payment goes toward principal. This is standard practice for UAE mortgages and is the basis for every EMI figure a bank quotes you.
How flat-rate interest differs
A flat rate calculates interest on the full original loan amount for every payment throughout the term, even as the balance falls. A flat rate of, say, 4% can end up costing roughly 1.8-1.9 times the equivalent reducing-balance rate over the same term, because you're effectively still paying interest on money you've already repaid.
Numeric comparison on a AED 500,000, 5-year loan
| Method | Total interest (approx.) | Effective annual cost |
|---|---|---|
| Reducing balance at 4% | ≈ AED 52,900 | ≈ 4.0% effective |
| Flat rate at 4% | ≈ AED 100,000 | ≈ 7.4% effective |
The two loans quote the identical '4%' headline, yet the flat-rate version costs roughly double in total interest, because it never reduces the base it charges interest on. This is the core reason the two structures can never be compared on headline rate alone.
Why this matters when comparing loans
If you're ever comparing a mortgage against another type of financing, always check whether the quoted rate is flat or reducing — comparing a flat rate directly to a reducing-balance rate understates the flat loan's true cost. UAE mortgages are reducing-balance, so you can compare mortgage offers on headline rate reasonably safely.
- Mortgages: always reducing-balance in the UAE
- Personal loans: sometimes flat, sometimes reducing — check the offer letter
- Car loans: often flat rate, which is why the headline percentage looks deceptively low
What to check before signing
Request the amortisation schedule, not just the headline rate and monthly payment. A genuine reducing-balance schedule shows the interest portion of each payment shrinking over time; if it stays flat throughout, you're not looking at a standard mortgage structure. Compare offers using a mortgage calculator to see this breakdown for yourself.
Run the numbers on your own case
Free Lenddoo tools and guides related to this article.
Last reviewed 8 July 2026