How Interest Rate Changes Affect Your Mortgage Payments

Interest Rates Rise, Property Affordability Goes Down. But How Big Is The Impact?

If interest rates rise, property affordability goes down. Higher rates means higher mortgage payments. Higher mortgage payments meant less people could afford to buy a property. It’s a simple equation.

This is something I have written about before. But perhaps the more important question is:

How much does it actually affect our monthly mortgage?

Because when we hear that Bank Negara Malaysia (BNM) increases the OPR by 0.25%, it sounds very small.

Only 0.25% mah.

But when that 0.25% is applied to a few hundred thousand ringgit of housing loan over many years, the impact can become quite real.

The good news today?

BNM is not increasing rates.

On 3 September 2026, BNM maintained the Overnight Policy Rate (OPR) at 2.75%. In fact, the OPR has remained at 2.75% throughout 2026 so far. BNM said the current monetary policy stance remains consistent with price stability and sustainable economic growth.

So, what happens if rates eventually rise?

Let’s do the maths

Let’s imagine someone takes a RM500,000 housing loan for 30 years.

These are illustrative calculations, not a quotation from any bank.

Interest rate	Approx. monthly instalment
2.75%	RM2,041
3.00%	RM2,108
3.25%	RM2,176
3.50%	RM2,245
3.75%	RM2,316
4.00%	RM2,387
4.50%	RM2,533

Look at what happens.

From 2.75% to 3.75%, the monthly payment increases by about RM275.

From 2.75% to 4.50%, it increases by almost RM500 every month.

RM500 a month means RM6,000 a year.

Suddenly that little 0.25% doesn’t look so little anymore, right?

What happens when OPR rises by 0.25%?

For floating-rate housing loans, an increase in OPR generally flows through to the borrowing rate. BNM itself explains that if OPR rises by 25 basis points, a floating housing-loan rate could rise by the same 25 basis points. Fixed-rate loans are different.

For our RM500,000 example:

At 3.00%: about RM2,108/month

At 3.25%: about RM2,176/month

Difference = roughly RM68/month.

That sounds manageable.

But if rates rise several times?

3.00% → 3.25% → 3.50% → 3.75% → 4.00%

Now the monthly repayment becomes about RM2,387.

That’s around RM279 more every month compared with 3.00%.

Over one year, that’s more than RM3,300 of additional cash flow.

And this is exactly why I always say:

Don’t buy a property based on today’s interest rate alone.

The bigger problem is actually affordability

There is another way to look at this.

Suppose you tell yourself:

“I can afford RM2,000 per month.”

Fine.

At around 2.75%, RM2,000 a month can support a loan of roughly RM490,000 over 30 years.

But if the interest rate goes up significantly, the same RM2,000 monthly budget can support a much smaller loan.

That means your purchasing power falls.

This is why interest rates can affect property prices even when property prices themselves have not changed.

The house may still be RM500,000.

But your ability to finance that RM500,000 has changed.

And this is where property buyers need to be careful

BNM’s latest decision is actually quite supportive for borrowers.

The OPR is currently 2.75%, compared with 3.00% before the July 2025 rate cut. BNM has kept it there through 2026 so far.

But should we assume 2.75% will stay forever?

No lah.

Interest rates move according to economic conditions, inflation, growth and other factors.

BNM’s September 2026 statement said Malaysia’s economy expanded strongly, with growth of 5.7% in the first half of 2026, while headline and core inflation averaged 1.8% and 2.0% respectively in the first seven months.

So for now, there is no need to panic.

But there is also no reason to become overconfident.

My simple rule when buying property

I would not calculate affordability based on the lowest possible interest rate.

I would calculate it based on a higher rate and ask:

“Can I still comfortably pay if rates rise?”

If the answer is yes, good.

If you can only afford the property when interest rates are extremely low, perhaps the property is actually too expensive for you.

And remember, the mortgage is not the only cost.

There are maintenance fees, assessment, quit rent, insurance, renovation, repairs and all the other lovely expenses that come with owning property. Haha.

So, are higher rates bad for property?

Not necessarily.

Higher rates can make borrowing more expensive and reduce affordability.

But lower rates can also encourage more people to borrow, which can increase demand for property.

For me, the important lesson is simpler.

Don’t buy a property because interest rates are low.

And don’t avoid a good property simply because rates have moved slightly higher.

Instead, understand your own cash flow.

If you earn RM8,000 a month and your housing commitment is RM2,000, a few hundred ringgit increase may still be manageable.

But if you are already stretching yourself to pay RM3,500 every month, another RM300 or RM500 can feel very different.

That’s the real issue.

It’s not just about the interest rate. It’s about your financial buffer.

BNM is keeping the OPR at 2.75% for now.

Enjoy the relatively favourable environment.

But when you buy property, always ask yourself one more question:

“If interest rates rise, can I still comfortably afford this property?”

If yes, perhaps you are buying within your means.

If no…

Maybe the property is not affordable after all.

Happy deciding.

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Sources

• Original article: “If interest rates rise, the affordability of property goes down. How big is the impact?” – kopiandproperty.com
• Bank Negara Malaysia – OPR Decisions 2026
• Bank Negara Malaysia – Monetary Policy Statement, 3 September 2026
• Bank Negara Malaysia – Monetary Stability / How changes in OPR affect loans