📊 How to Calculate Interest on a Loan: A Guide for Singapore Borrowers
💡 Why Interest Calculation Matters
Whether you’re applying for a personal loan, business loan, or mortgage, understanding how interest is calculated helps you:
- Avoid hidden costs
- Compare loan offers accurately
- Plan your repayments confidently
In Singapore, interest rates are regulated by the Monetary Authority of Singapore (MAS), and lenders use different methods depending on the loan type.
🔢 Types of Interest Calculation
1. Simple Interest
Used for short-term personal or business loans.
Formula:
Interest = Principal × Rate × Time
Example:
Loan: S$10,000
Rate: 5% per annum
Time: 2 years
→ Interest = 10,000 × 0.05 × 2 = S$1,000
You’ll repay S$11,000 over 2 years.
2. Flat Rate Interest
Common for personal loans and hire purchase agreements.
How it works:
Interest is calculated on the full principal, regardless of how much you’ve repaid.
Example:
Loan: S$20,000
Rate: 6% p.a.
Tenure: 3 years
→ Total Interest = 20,000 × 0.06 × 3 = S$3,600
→ Monthly Repayment = (20,000 + 3,600) ÷ 36 = S$650
3. Reducing Balance Interest
Used for mortgages and some business loans.
How it works:
Interest is calculated on the remaining balance each month.
Example:
Loan: S$500,000
Rate: 4% p.a.
Tenure: 25 years
→ Monthly repayment varies, but total interest is lower than flat rate.
Use our loan calculators to explore further..
4. Effective Interest Rate (EIR)
Includes fees and compounding effects—used to compare loan offers.
Tip: Always ask for the EIR when comparing loans. It reflects the true cost of borrowing.
🧮 Loan Type Breakdown
| Loan Type | Common Interest Method | Typical Rate (SG) | Notes |
|---|---|---|---|
| Personal Loan | Flat / Simple | 3%–8% p.a. | Fixed monthly payments |
| Business Loan | Simple / Reducing Balance | 5%–12% p.a. | May vary by lender |
| Mortgage Loan | Reducing Balance / EIR | 1.5%–3.5% p.a. | Often linked to SORA benchmark |
🧠 Pro Tips for Borrowers
- ✅ Use online calculators to simulate repayments
- ✅ Compare EIR, not just advertised rates
- ✅ Ask about fees, lock-in periods, and early repayment penalties
- ✅ Choose shorter tenures to reduce total interest paid
📞 Need Help Calculating Your Loan?
At LENDING8.COM, we offer:
- 💰 Transparent loan packages
- 🔍 Free interest calculation consultations
- 🧭 Personal, business, and mortgage loan options
🔵 Use our calculators to calculate Loan Interest
🎯 Ready to Make a Smarter Choice?
Let us help you choose the right financing option for your needs.
Let’s turn your financial goals into reality.
Apply now or speak to our consultants for personalized advice.
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