What is EIR in a personal loan? Singapore's true cost of borrowing

The Effective Interest Rate (EIR) is the true annual cost of a personal loan, including interest, fees and the effect of compounding. It is almost always higher than the advertised flat rate.

If you compare personal loans using only the advertised rate, you can understate what the loan really costs. In Singapore, effective interest rate (EIR) is the better comparison metric because it reflects the true borrowing cost more clearly than the headline rate alone. It helps you compare loans with different repayment structures, fees, and payment schedules on a more like-for-like basis.

What is an Effective Interest Rate (EIR)?

Effective Interest Rate (EIR) is the true annual cost of borrowing, expressed as a percentage – it includes interest, fees, and the effect of compounding, making it a more accurate comparison metric than the advertised flat rate. Unlike the annual flat rate, EIR takes into account the number of instalments, frequency of instalments, and instalment amounts to give you a complete picture of what a loan actually costs.

Why not just use the Annual Interest Rate?

In Singapore, financial institutions typically advertise a flat interest rate – not the full annual cost of borrowing. This advertised flat rate is appealing because it looks low, but it is not the same as EIR. However, borrowers should always look at the EIR for a better idea of the total interest accumulated over time and use it to compare loans from different loan providers.

For example:

• Bank A and Bank B might both advertise a flat interest rate of 5% on a $10,000 loan over 24 months.

• However, Bank B charges a $200 processing fee while Bank A charges none.

• By putting all factors into consideration, EIR makes it easier to compare the cost of two loans and calculate the total cost of borrowing that you are really paying.

In Singapore there is a further complication: banks advertise a flat rate, which is calculated differently from a compound annual rate – and both are different from the EIR. Here is how the three relate for the same loan:

To make this concrete – here is the same $20,000 loan at two banks, both advertising the same flat rate:

_{[For illustration purposes only] Note: Bank B's EIR is higher here because of its processing fee and the extra two years of interest. At the same flat rate and with no fees, EIR barely changes with tenure; a fee is what moves it.}

Bank A and Bank B advertise the exact same flat rate – but Bank B costs $1,600 more in total ($3,700 in interest and fees against $2,100), and its EIR is higher because of the longer tenure and the processing fee. This is why EIR is the right comparison metric, not the advertised rate. Also check:

• Monthly repayment

• Total payable amount

• Processing or admin fees

• Early repayment terms

• Whether the repayment period still fits your budget

If you want to apply this in practice, compare personalised offers side by side rather than relying on promotional headline rates. Using a loan matching platform like Lendela pulls all your personalised loan offers with all the terms you need to make the best loan decision for your situation.

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How do I calculate EIR?

Banks and financial institutions are required to include additional costs like admin fees in the EIR they calculate for customers. To keep things simple, here's how EIR works in a scenario with no additional fees, using the same approximation method used elsewhere in this guide.

For loans with equal monthly instalments, EIR can be approximated using:

EIR ≈ 2 × flat rate × n ÷ (n + 1)

Where flat rate is the advertised interest rate (5% is entered as 0.05), and n is the total number of monthly instalments.

To illustrate: say you take out a loan for $10,000 with 12 monthly instalments at a 5% flat rate. Applying the formula:

EIR ≈ 2 × 5% × 12 ÷ (12 + 1) ≈ 9.2% p.a.

This means your monthly instalment works out to roughly $875, for a total repayment of around $10,500 over the year, an effective cost noticeably higher than the 5% flat rate suggests on its own. Over 24 months the same loan comes to about 9.6% p.a.

_{This is a simplified approximation for illustration. The actual EIR calculation required by MAS is based on the real cash flow schedule of your loan and accounts for fees precisely, so always check the EIR disclosed in your actual loan offer rather than relying on this formula alone.}

You can save time by using an online EIR calculator, or better yet, use a trusted loan matching platform like Lendela where you can compare and pinpoint out the lowest interest rate personal loan in Singapore within minutes. Since Lendela only partners with reputed licensed banks and loan providers in Singapore, you are sure to avoid loan sharks that prey on unsuspecting clients online.

Should I go for the loan with the lowest EIR?

Generally speaking, going for the lowest EIR is a reliable and cost-effective option. However, borrowers should also take the time to consider other important factors, such as repayment flexibility and loan terms when making their decision.

For example, if you're looking for a loan that can be repaid over a longer period of time, it is better to go for one with a more flexible repayment structure even if its EIR is slightly higher. On the other hand, if you have sufficient cash flow to meet your monthly instalments, then a lower EIR loan may be the most cost-effective option.

Pro tip: Always consider your monthly repayment affordability before finalising a loan. Use budgeting tools or apps to calculate how much you can comfortably repay without compromising other financial goals.

Longer loan, same rate, more interest

With the same flat rate and no fees, EIR stays almost the same as the tenure grows: about 9.5% to 9.7% at a 5% flat rate. What changes is the total interest, which rises with every extra year: $500 over 12 months, $1,000 over 24 months and $2,500 over 60 months on a $10,000 loan. Even though you pay less each month over a longer period, you pay more in total.

How much can I afford to pay back every month?

Some banks vary their rates by tenure band, so a shorter or longer tenure can change the EIR you are offered. A shorter tenure usually means a higher monthly repayment, and having to pay back so much money straight away might put you into financial stress. You should also take into consideration of other risk factors, such as the increment of late fees and penalties when you are unable to repay your instalments in full and on time.

What borrowers in Singapore should do with EIR

Use EIR as your first filter, but not your only filter. A good comparison process looks like this:

1. Compare offers on the same repayment period
2. Use EIR/APR first
3. Check monthly repayment
4. Check total payable amount and fees
5. Check early repayment terms
6. Choose the offer whose repayment schedule you can comfortably sustain

If you want to compare offers next, go to compare personal loans. If you want to see how EIR appears inside an actual offer, read our guide to reading a personal loan offer.

Want the broader pricing glossary too? Read loan cost & pricing for EIR, advertised rate, APR, fees, and penalties in one place. For a benchmark of what EIR to expect based on your income and loan amount, see our guide to average personal loan interest rates in Singapore.

Frequently asked questions about EIR

What does EIR mean in a personal loan?

EIR stands for Effective Interest Rate. It is the true annual cost of borrowing, including interest, processing fees and the effect of compounding, and it is almost always higher than the advertised flat rate. MAS requires all licensed banks and financial institutions in Singapore to disclose the EIR on every personal loan, which makes it the only reliable figure for comparing loans side by side.

What is a good EIR for a personal loan in Singapore?

Bank-published rates vary by bank and promotion, and the lowest figures are best-case rates for qualifying borrowers. As of October 2026, banks' own pages show Standard Chartered CashOne from 0.90% p.a. (EIR from 1.75%, or 2.15% including the first-year fee, under a promotion to 31 December 2026), UOB from 1.00% p.a. (EIR from 1.93%, processing fee waived) and DBS from 1.48% p.a. (EIR 3.22% including its 1% processing fee). Advertised flat rates typically range from 1% to 4% p.a., with EIR usually running 1.8 to 2.5 times the advertised figure. As a benchmark, an EIR below 5% p.a. is competitive. For a bank-by-bank comparison, see our personal loan interest rates guide.

Why do some borrowers see a higher EIR than others?

Banks use risk-based pricing: your CBS credit score, income, and existing debt obligations all affect the rate you're offered. A stronger score and lower obligation load typically unlock the lowest advertised rates; a weaker score, thinner income history, or higher existing debt usually means a higher EIR, a smaller approved amount, or decline.

Borrowers who don't qualify for bank rates still have options, licensed loan providers and other regulated channels generally serve a wider range of profiles, though their EIRs typically run higher, from around 10% to 18% p.a., reflecting the greater risk taken on.

Does EIR apply to all types of loans in Singapore?

Yes. Under MAS regulations, all licensed banks and financial institutions in Singapore are required to disclose the EIR on every personal loan, renovation loan, and debt consolidation plan. Licensed loan providers are regulated separately by the Ministry of Law but must also clearly disclose interest rates. When comparing across banks and financial institutions, always use EIR as your common benchmark.

What is the difference between EIR and APR?

EIR (Effective Interest Rate) and APR (Annual Percentage Rate) are similar concepts – both reflect the true annual cost of borrowing, including fees and compounding. In Singapore, EIR is the standard term used by MAS-regulated institutions. APR is more commonly used in Western markets. If you encounter APR on a foreign loan provider's product, treat it as broadly equivalent to EIR for comparison purposes.

Does EIR go down when I choose a longer loan tenure?

Usually not, when the flat rate is the same: EIR stays almost constant while total interest rises. EIR falls with a longer tenure only when an upfront fee is spread over more months. For example, a 1% fee on a 1.48% flat loan gives an EIR of 4.7% over 12 months and 3.3% over 60 months. Always check the total amount repayable alongside the EIR, not EIR alone.

Sources

MoneySense: costs of borrowing – https://www.moneysense.gov.sg/costs-of-borrowing-flat-rate-monthly-rest-and-effective-interest-rate/

Bank-published rates, checked 7 October 2026: Standard Chartered CashOne, UOB Personal Loan, DBS Personal Loan

Last updated: 8 October 2026.