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What Is an Effective Interest Rate (EIR) & How Do You Calculate It
1 July 2026 | Monetium Credit
The effective interest rate, or EIR in short, can be looked at as the true, actual costs of a loan, including the compounded interest rate. The EIR can give borrowers a clear, straightforward view of the sums they need to pay for the duration of the credit contract and it’s also a way to compare different loan offers before making a decision.
Advertised rate can somewhat be misleading, as it often doesn’t take into account extra administration fees or compounded interest. Therefore, as a general rule, if you want to see the real costs of a loan package you need to pay attention to the effective interest rate formula.
Why EIR Is Different from the Advertised Rate?
When considering the services of a Singapore moneylender, you need to pay attention to two things.
- The lender must be licensed and authorised by the Monetary Authority of Singapore
- You need to evaluate the effective interest rate of the commercialised loan package, as the advertised rate often doesn’t reflect the repayment structure of the loan, and hence it can appear to be more advantageous than it actually is.
The advertised rate often doesn’t reflect compounding or the full repayment structure associated with the monthly financial obligations. With the majority of loans, including the ones provided by our agency you pay back part of the principal with every passing month, so even if the interest was advertised on the original amount, after a couple of months/years you will effectively use less money. EIR adjusts for this, and it also uses a different calculation method when determining the total interest of the credit package.
How to Calculate Interest Rate?
When it comes to EIR, the calculation formula is actually quite straightforward:
EIR = (1 + i / n)^n – 1, in which i is represented by the nominal AIR, and N is the number of compounding periods in a calendar year.
The effective EIR can be affected by many things, including the total costs of the administrative fees, or whether the borrowers go for yearly or monthly repayments. But the good news is that, most of the time, EIR is displayed by banks and lenders, for transparency reasons.
How much will the effective interest rate affect things? Imagine, for example, that you apply for a $10,000 loan that has an advertised APR of 8%. The credit package might seem affordable at first glance, but the advertised rate doesn’t take into account the loan processing fee, and whether repayments are done monthly or yearly.
EIR takes everything into account and is a more accurate way of determining the total costs of the loan. Meanwhile, the advertised rate can sometimes be misleading, and that 8% interest on the loan can be closer to 10% all things considered.
What Affects EIR when Compounding Loans?
Loan Amount
The total amount of the loan can have a significant effect on EIR, as oftentimes, supplementary administration costs are directly tied to the amount you want to borrow. For example, you apply for a loan that has an advertised APR of 9%. That sounds good, but if the loan administration fee is 4%, then the real AIR will be more than what was advertised, and the sum you need to pay to the lender will increase the more you borrow.
Loan Tenure
As a general rule, longer loan tenure equates to lower interest costs, while short-term loans are often characterised by interest rates that are in line with the maximum permissible by the Moneylenders Act. With a longer tenure, the repayment can be spread out over time, which can increase the total amount being paid, even though the monthly interest is more advantageous. All this can be taken into consideration by the effective interest rate.
Processing and Administration Fee
Some lenders or banking institutions charge extra administrative fees for the provided credit packages, which, according to the framework supervised by the MAI, cannot exceed 10% of the loan principal. Even if you’re using the best licensed moneylender in Singapore, you still need to take into consideration the effect of these fees on the EIR of the credit package.
Repayment Frequency
Some loans utilise fixed monthly repayment structures, while for others the interest might be influenced by the remaining balance. More frequent repayments can change how the interest is calculated and, therefore, impact the effective interest rate.
Should You Always Choose the Lowest IRS?
Just like when deciding whether to go for a personal or SME loan for your business, the answer might be more nuanced than you think. It’s difficult to provide a clear answer, as EIR can reduce costs, but it shouldn’t be the only factor to consider when comparing different loan packages.
Besides EIR, borrowers also need to consider the total interest payable for the duration of the loan, consider the loan tenure, whether the repayment structure is monthly or yearly-based, and whether the extra charges of the credit are transparent and well-presented by the lending agency.
In general, yes, a loan with a lower EIR will be more advantageous, and it’s usually a good idea to look for one that takes into account all the fees associated with the loan package. But the loan duration is also important. There is a difference after all between a loan package with a repayment term that totals one year versus one that you must pay in three years.
Conclusion:
The effective interest rate is an efficient way for borrowers to calculate the true, total costs of the loan, besides the advertised rate, which sometimes doesn’t include the loan administration fees or compounding. EIR is also a good way to compare different loan packages, and it’s the number one factor borrowers need to account for when assessing the affordability of a loan package. It’s not everything that matters, that’s true, but it can present an accurate reflection of the loan terms.
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