Flat rate vs reducing rate: which actually costs less
- A flat rate charges interest on the full original loan for the whole term, while a reducing rate charges only on the falling balance.
- For the same headline rate a flat-rate loan costs almost double, so a 5% flat rate is roughly a 9% reducing rate.
- UAE mortgages always use reducing balance, so convert any flat rate before comparing.
A flat rate charges interest on the full original loan amount for the whole term, while a reducing rate charges interest only on the balance you still owe, which falls as you repay. For the same headline rate, a flat-rate loan costs almost double the interest, so a 5% flat rate is roughly equivalent to a 9% reducing rate. UAE mortgages always use reducing balance, so convert any flat rate before comparing.
If you have ever compared two loans and wondered why the one with the lower rate seemed to cost more, the answer is almost always flat rate versus reducing rate. They are two different ways of charging interest, and a flat rate that looks cheaper is usually the more expensive deal. This matters in the UAE because mortgages are quoted on a reducing rate, while some personal and car loans are still advertised on a flat rate, which makes a direct comparison misleading unless you convert one to the other.
What is a flat rate?
A flat rate charges interest on the full original loan amount for the entire term, regardless of how much you have already repaid. If you borrow AED 100,000 at a 5% flat rate over 5 years, you are charged 5% of the full AED 100,000 every year for all 5 years, even though your balance is falling as you repay. The interest is fixed at the start and does not shrink as the loan does.
What is a reducing rate?
A reducing rate (also called reducing balance) charges interest only on the outstanding balance, which falls every month as you repay. Early on you pay more interest because the balance is large, but as the balance drops, so does the interest portion of each payment. This is how every UAE mortgage works, and it is the fairer of the two methods because you only pay for the money you still owe.
The difference, with a worked example
Take a AED 100,000 loan over 5 years:
| Flat rate at 5% | Reducing rate at 5% | |
|---|---|---|
| Interest charged on | Full AED 100,000 every year | The falling balance |
| Total interest over 5 years | AED 25,000 | About AED 13,200 |
| Total repaid | AED 125,000 | About AED 113,200 |
Same headline rate of 5%, but the flat-rate loan costs almost double the interest. That is the trap: a 5% flat rate is nowhere near as cheap as a 5% reducing rate. To cost the same as a 5% flat rate, a reducing-rate loan would need a rate of roughly 9%.
Why a flat rate looks cheaper
Lenders quoting a flat rate can advertise a smaller number while still earning more, because the rate is applied to the whole original sum the whole time. A borrower comparing a 5% flat loan against a 9% reducing loan might pick the 5% one and end up paying the same or more. The headline figure hides the real cost.
The rule of thumb for converting
As a quick guide, a flat rate is roughly equivalent to a reducing rate of about 1.8 to 1.9 times the flat figure for a typical loan term. So a 2.5% flat rate is in the region of a 4.5% reducing rate, and a 5% flat rate is around 9% reducing. The exact multiple depends on the term, but the direction is always the same: the reducing equivalent is far higher than the flat number suggests. When in doubt, ask the lender for the reducing rate, or for the total amount payable, which cannot be disguised.
Always compare like with like: convert any flat rate to its reducing equivalent, or simply compare the total amount repayable across both loans. Never compare a flat rate directly against a reducing rate.
Where you see each in the UAE
UAE mortgages are quoted and calculated on a reducing balance, so the rates on our rates page are all reducing rates you can compare directly and input straight into the mortgage calculator. Flat rates still appear in some personal loan and car loan advertising, and occasionally in informal mortgage quotes from less transparent sources. If anyone quotes you a flat mortgage rate, convert it before comparing, because every mainstream UAE bank works on reducing balance.
How to compare loans properly
- Ask for the reducing rate on anything quoted as flat.
- Compare the total amount payable, not just the headline rate. This figure exposes the real cost.
- Check the basis on every quote. A 2.5% flat and a 4.5% reducing can be the same deal.
- Use a reducing-balance calculator to model the true monthly cost. Our UAE mortgage calculator uses reducing balance, the same method the banks apply.
The bottom line
A reducing rate charges interest only on what you still owe, while a flat rate charges it on the full original amount the whole way through, which makes a flat rate far more expensive than its low headline suggests. UAE mortgages always use reducing balance, so compare mortgage rates directly on our rates page, and convert any flat rate you are quoted elsewhere before you decide. To see your real monthly cost on a reducing basis, use the calculator.
Frequently asked questions
What is the difference between a flat rate and a reducing rate?
A flat rate charges interest on the full original loan amount for the whole term, while a reducing rate charges interest only on the outstanding balance, which falls as you repay. For the same headline rate, a flat-rate loan costs far more interest. UAE mortgages always use reducing balance.
Is a flat rate cheaper than a reducing rate?
No, the opposite. A flat rate looks cheaper because the number is smaller, but it is applied to the full original amount the entire term, so it costs more. A 5% flat rate is roughly equivalent to a 9% reducing rate, almost double the real cost.
How do you convert a flat rate to a reducing rate?
As a rule of thumb, a reducing-rate equivalent is about 1.8 to 1.9 times the flat rate for a typical loan term. So a 2.5% flat rate is in the region of 4.5% reducing, and a 5% flat rate is around 9% reducing. The exact figure depends on the term, so ask the lender for the reducing rate or the total amount payable.
Do UAE mortgages use flat or reducing rates?
UAE mortgages are quoted and calculated on a reducing balance. Every mainstream UAE bank charges interest on the falling balance, so the rates you compare on a mortgage rate table are reducing rates. Flat rates mainly appear in some personal loan and car loan advertising.
Why does a flat rate look lower than a reducing rate?
Because the flat rate is applied to the whole original loan for the entire term, the lender can advertise a smaller percentage while still earning more interest. The low headline number hides the real cost, which is why you should always compare the total amount repayable instead.
Compare real reducing rates, not flat ones
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