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Floating Interest Rate Mortgages: What It Is and How It Works?

Article
25 Nov 2025

A floating mortgage rate is an interest rate that changes following market conditions and Bank Indonesia policies. This type of interest offers flexibility for borrowers as installments can adjust to the benchmark rate. Learn how it works and its benefits with BTN.

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A house is a primary need for everyone and beyond that, it can also be one of the most rewarding investments. Property prices continue to rise every year, making home ownership an asset with increasing value over time.

Today, mortgage loans (KPR Kredit Pemilikan Rumah) have become a solution for those who want to purchase a home through affordable installments.
According to the Indonesian Property Dictionary (Erwin Kallo, 2016), a mortgage loan is defined as credit issued by a financial institution to facilitate home ownership or purchase.

However, when considering a mortgage, it’s important to understand the types of interest rates offered by banks or financial institutions since these rates directly affect the amount of monthly payments you’ll make.
One common type is the floating interest rate. So, what exactly is a floating interest rate? How does it work, and what types are there? This article will explain the three main types of floating interest rates and how each works to help you make better decisions when choosing a mortgage.

Key Takeaways:

  • Unlike fixed rates, floating interest rates change according to market fluctuations. This means your monthly installment amount will vary depending on changes in the market rate.
  • Bank Indonesia sets the Prime Lending Rate (Suku Bunga Dasar Kredit / SBDK) as a reference for mortgage interest through government policy. Banks typically use this as the foundation for determining their floating rate.

Types of Mortgage Interest Rates

Each bank or financial institution offers different types of interest rates for mortgage products, depending on their internal policies and calculations. Generally, there are two types: fixed rate and floating rate.

Below is an explanation of each type according to CNBC Indonesia:

Fixed Rate Interest

A fixed rate is an interest rate that remains unchanged for a specific period. Some banks even offer fixed rates for the entire duration of the loan or until maturity.

The main advantage of a fixed rate is stability borrowers pay the same installment amount every month. This makes it appealing to debtors, as payments remain predictable and are not affected by market fluctuations or changes in bank policy.

According to Tempo.co, examples of fixed rate loans include subsidized home mortgages or vehicle loans. For instance, a bank may offer a fixed 6% interest rate for the first five years. After that period, the loan transitions to a floating rate.

Floating Rate Interest

Unlike the fixed rate, the floating (or variable) interest rate changes periodically following market movements. This means your monthly installment will fluctuate depending on changes in the market rate. If market interest rates rise, your payments will increase accordingly.

As explained by money.kompas.com, floating rates are generally applied after an initial fixed-rate period. When determining mortgage floating rates, banks refer to benchmark indices such as interbank market rates or the central bank’s reference rate, which can change over time.

In most cases, floating rates begin once the fixed-rate period ends.

How Floating Mortgage Interest Rates Work

Floating mortgage rates work differently from other types of interest. Below are some key points on how they operate:

The Government Sets a Maximum Limit

Bank Indonesia establishes the Prime Lending Rate (SBDK) as a reference point for determining mortgage interest rates, under national financial policy.
This means banks do not have full freedom to set floating interest rates arbitrarily. While they aim for profitability, they must comply with the limits and regulations set by the government.

Floating Rates Follow Economic Conditions

The dynamic nature of floating mortgage rates means that they change according to economic conditions. For example, during the COVID-19 pandemic, interest rates dropped as part of relief efforts for affected borrowers.

As a result, many borrowers benefited from lower interest payments, which helped ease their financial burdens during difficult times.
Therefore, it’s essential to stay updated on the latest SBDK rates. You can check them directly through the official Bank Indonesia website or reputable national financial news sources.

Longer Repayment Tenure

Floating-rate mortgages typically offer longer repayment periods compared to fixed-rate mortgages. Therefore, when applying for a mortgage, it’s crucial to understand the difference between fixed-rate and floating-rate tenures.

Additionally, be prepared for potential additional costs that may arise during the mortgage process. This will help you manage your finances effectively and avoid future difficulties.

Advantages of Floating Mortgage Interest Rates

According to loanmarket.co.id, floating rates offer several advantages worth considering for long-term financial planning:

Flexibility

Even though floating rates fluctuate, this variability can actually be beneficial. For example, when Bank Indonesia the central bank lowers its benchmark interest rate, your mortgage payments will automatically decrease as well.
his reduction can save you a significant amount over the life of the loan.

For instance, if your bank sets a floating mortgage rate at 8% when the BI rate is 7%, and then the BI rate drops to 6%, your bank will adjust its floating mortgage rate down to 7%.

Saving Opportunities

Another advantage of a floating rate is that it provides opportunities to save. When interest rates decrease, your monthly payments become smaller freeing up extra cash. You can allocate this surplus toward savings or emergency funds, helping you strengthen your financial position.

Conclusion

Floating mortgage interest rates offer flexibility and potential savings but also come with the challenge of fluctuating payments tied to market conditions.
Understanding how floating rates work and their advantages will help you make more informed decisions when choosing a mortgage especially if you’re seeking long-term financing with opportunities for savings.

Want to own your dream home with a flexible mortgage plan?
Apply for a BTN Mortgage and enjoy the benefits of adjustable floating rates that adapt to economic conditions. You can also simulate your mortgage through BTN’s official website.


Writen By

sekretaris

Ramon Armando

Corporate Secretary PT Bank Tabungan Negara Persero) Tbk | Csd@btn.co.id

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