Flat Rate vs Reducing Balance: How Loan Interest Really Works

Two loan offers land in front of you. One says 6% interest. The other says 12%. Easy choice, right?

Not so fast. In Malaysia, those two numbers could describe loans that cost almost exactly the same. That's because lenders quote interest in two different ways: flat rate and reducing balance (also called the effective rate). Until you know which one you're looking at, the number on the brochure tells you very little.

Let's break down how each method works, run the actual numbers, and show you how to compare offers properly.

What "p.a." means first

You'll see "p.a." after almost every interest rate — it's short for per annum, meaning per year. A rate of 6% p.a. means 6% of some amount is charged as interest each year. The crucial question is: 6% of what? That's exactly where flat rate and reducing balance part ways.

Flat rate: interest on the original amount, forever

With a flat rate, interest is calculated on your original loan amount for the entire tenure — even as you pay the loan down.

The formula is simple:

Total interest = Principal × Flat rate × Number of years

Say you borrow RM10,000 over 24 months at 6% p.a. flat:

• Total interest = RM10,000 × 6% × 2 years = RM1,200
• Total repayment = RM10,000 + RM1,200 = RM11,200
• Monthly instalment = RM11,200 ÷ 24 = RM466.67

Notice what happened there. In month 23, you've already repaid most of the RM10,000 — yet you're still being charged interest as if you owed the full amount. Flat rates are common in Malaysia for car (hire purchase) loans and some personal loans, largely because the maths is easy to explain and the instalment is easy to quote.

Reducing balance: interest on what you still owe

With a reducing balance (effective) rate, interest is charged only on your outstanding balance each month. As you repay, the balance shrinks, so the interest portion of each instalment shrinks too.

Take the same RM10,000 over 24 months, this time at 12% p.a. on a reducing balance. That's 1% per month on whatever you still owe:

• Month 1: you owe RM10,000, so interest is RM100. The rest of your instalment reduces the principal.
• Month 12: you owe roughly half, so interest is roughly half.
• Month 24: you owe very little, so interest is nearly nothing.

Using the standard amortisation formula, the instalment works out to RM470.73 per month, for a total repayment of RM11,297.52 — about RM1,297.52 in interest.

The surprise: 6% flat ≈ 12% reducing

Put the two side by side:

	6% p.a. flat	12% p.a. reducing balance
Loan amount	RM10,000	RM10,000
Tenure	24 months	24 months
Monthly instalment	RM466.67	RM470.73
Total interest	RM1,200.00	RM1,297.52
Total repayment	RM11,200.00	RM11,297.52
How interest is charged	On the original RM10,000, every month	Only on what you still owe

The loan advertised at 6% costs almost the same as the one advertised at 12%. In fact, a 6% flat rate over 24 months works out to an effective rate of roughly 11.1% p.a. — the exact conversion depends on the tenure, but as a rough rule of thumb, the effective rate is close to double the flat rate.

So a flat rate isn't a scam — it's just a different way of expressing the same cost. The problem is when borrowers compare a flat number against an effective number and think the flat one is half the price. It isn't.

Why the flat rate "understates" the cost

Think of it this way: on a reducing balance loan, you only pay for the money while you're actually using it. On a flat rate loan, you pay rent on the full RM10,000 for two years, even though on average you're only holding about half of it.

That's why the flat percentage looks so small. It's spreading the true cost over a principal you no longer fully owe.

How to compare loan offers properly

When you're weighing two offers, don't compare the headline rates unless you're sure they're quoted the same way. Instead:

• Ask for the effective rate. Any licensed lender should be able to tell you the reducing-balance equivalent of their quote. Banks in Malaysia typically disclose this in the product disclosure sheet.
• Compare total repayment. Total instalments minus the amount borrowed = your true cost in ringgit. This works regardless of how the rate is quoted.
• Compare the monthly instalment for the same amount and tenure. If both loans are RM10,000 over 24 months, the lower instalment is genuinely cheaper — no conversion needed.
• Check the fees. Processing fees, stamp duty and insurance can shift the picture, so read the full breakdown, not just the rate.

If you're unsure what a lender is quoting you, just ask directly: "Is that flat or reducing balance?" It's a completely normal question, and the answer changes everything.

Early settlement: where the difference really bites

Planning to pay your loan off early? The quoting method matters a lot here.

On a reducing balance loan, early settlement is straightforward: you pay off the outstanding principal, interest stops accruing, and you save all the future interest. Some lenders charge an early settlement penalty, so check the terms — but the mechanics work in your favour.

On a flat rate loan, the total interest was fixed upfront, so lenders use a rebate formula (in Malaysia, commonly the "Rule of 78") to work out how much interest to give back. The catch: the Rule of 78 front-loads interest, so settling early returns less rebate than you might expect. You still save money by settling early — just not as much as the simple maths suggests.

Either way, before you sign anything, ask two questions: How is early settlement calculated? and Is there a penalty? You can find more common questions answered on our FAQ page.

The bottom line

• Flat rate = interest on the original amount for the whole tenure. Small number, but it understates the real cost.
• Reducing balance = interest only on what you still owe. This is how the loan actually costs you.
• A flat rate roughly doubles when converted to its effective equivalent.
• Always compare effective rates or total repayment, never a flat number against a reducing one.

At MyLoanCredits, we keep it simple: our personal loan rates are quoted from 3.88% to 12% p.a. on a reducing balance — the honest, what-it-actually-costs way — for amounts from RM1,000 to RM100,000 over 6 to 60 months, with no early settlement penalty and your total cost shown clearly before you sign. You can see exactly how it works, or apply online in minutes and get a transparent quote with nothing hidden in the maths.