SORA vs SIBOR vs Fixed Rate: What’s the Difference?

Table of Contents:

1. Introduction: Why This Matters More Than Ever
2. What Is SORA and How It Works
3. SIBOR: The Legacy Rate and Why It Was Replaced
4. Fixed-Rate Mortgages in Singapore: The Safety Net
5. Head-to-Head Comparison Table
6. Strategic Considerations Based on Buyer Profiles
7. Should You Refinance to a SORA Loan in 2025?
8. Frequently Asked Questions (FAQ)
9. Common Myths: Debunking Mortgage Misconceptions

Why This Matters More Than Ever

In 2025, choosing the right mortgage rate structure isn’t just a financial decision—it’s a lifestyle strategy. With SIBOR phased out, homebuyers and refinancers now face a crucial fork in the road: do you go with the new SORA-pegged floating rates, or take the steady path with fixed-rate mortgages?

The answer isn’t one-size-fits-all. Your income rhythm, investment horizon, appetite for volatility, and even life stage all shape the right fit.

This guide will walk you through the differences in full depth—with clear analogies, side-by-side tables, and real-world scenarios—so you can confidently choose the mortgage structure that best supports your future.

What Is SORA and How It Works

The Singapore Overnight Rate Average (SORA) is now Singapore’s official interest rate benchmark for retail mortgages. Overseen by the Monetary Authority of Singapore (MAS), it reflects the actual cost of unsecured overnight borrowing between banks.

What makes SORA unique is its use of compounded averages. Most home loans today are priced off the 3-month compounded SORA (3M SORA).

As of July 2025:

• 3M SORA: ~3.35%
• Typical Bank Spread: 0.75% to 1.00%
• Effective Rate: ~4.10% to 4.35%

Benefits:

• Transparent: Published daily by MAS, free from manipulation risk
• Stable: Less volatility due to backward-looking compounding
• Globally aligned: Replaces LIBOR and SIBOR-style benchmarks worldwide

Limitations:

• May lag behind fast rate hikes or drops
• Not as intuitive to understand as fixed or forward-looking rates

SIBOR: The Legacy Rate and Why It Was Replaced

SIBOR (Singapore Interbank Offered Rate) was based on estimates of interbank lending costs, not actual transactions. While it served as the benchmark for decades, it had several critical flaws:

• Forward-looking and volatile
• Subject to market speculation and liquidity swings
• Risk of manipulation (as seen in the LIBOR scandals globally)

In response, MAS fully phased out SIBOR by 2024. Existing SIBOR loans were transitioned to either SORA-based loans or internal board rates.

If you’re still on a legacy SIBOR package and haven’t reviewed your rate, now is the time.

Fixed-Rate Mortgages in Singapore: The Safety Net

Fixed-rate loans offer interest rate certainty during the fixed period, usually 1 to 3 years. In 2025, most fixed packages come in around 3.75% to 4.10%.

Who Should Consider Fixed Rates:

• First-time buyers
• Young families on tight budgets
• Buyers during periods of rising interest rates

Pros:

• Fixed monthly repayments = budgeting confidence
• Shielded from short-term rate hikes

Cons:

• No benefit if interest rates drop
• Usually higher than floating rates during stable periods
• Lock-in periods often apply (2–3 years)

Head-to-Head Comparison Table

Strategic Considerations Based on Buyer Profiles

1. Young Couples on a Tight Budget: Go fixed. Predictable repayments reduce financial anxiety during early-stage income growth.
2. Investors or Upgraders: SORA gives better upside if rates trend down, plus easier refinancing paths.
3. Buyers with Variable Income: SORA might work if you’ve got buffer savings. Otherwise, fixed offers mental peace.
4. Nearing Retirement: Fixed for certainty, or consider partial capital repayment to shorten tenure.

Should You Refinance to a SORA Loan in 2025?

Yes, especially if:

• You’re still on a legacy SIBOR or board rate loan
• Your fixed package has expired or exceeds 4.3%

Benefits of switching:

• Lower prevailing rates
• Transparent pricing
• Banks offer legal subsidies (up to ~$2,500)

Moshin’s real-time calculator can show if the savings outweigh switching costs in your case. Chat with Moshin to simulate.

How to Choose What Fits You

Ask yourself:

• Can I tolerate payment fluctuations every quarter?
• Do I expect rates to rise, fall, or stay flat?
• Is budgeting certainty more important than chasing marginal savings?

SORA is the new normal—but fixed-rate mortgages still have their place. You don’t have to navigate this alone.

Chat with Moshin for a free side-by-side breakdown of SORA vs fixed rates personalised to your income, tenure, and CPF usage.

Frequently Asked Questions (FAQ)

1. Is SORA better than SIBOR? Yes. SORA is based on actual transactions, not estimates, making it more stable and transparent.

2. Can I still choose a SIBOR loan? No. All new housing loans in Singapore are now based on SORA or fixed rates.

3. Is it cheaper to go with SORA or fixed rates in 2025? SORA is slightly cheaper at the moment, but fixed rates offer stability. It depends on your preference.

4. How often does SORA reset? Typically every 3 months for most mortgage packages.

5. What is a bank spread in a SORA loan? It’s the bank’s markup over SORA (e.g., SORA + 0.8%). This spread stays fixed during your lock-in.

Common Myths: Debunking Mortgage Misconceptions

Myth 1: SORA rates can change every day. Not exactly. While SORA is calculated daily, your home loan uses a 3-month compounded rate that changes quarterly.

Myth 2: Fixed rates are always safer. Only during the fixed period. Once that ends, you’re back to floating rates unless you refinance.

Myth 3: All banks offer the same SORA spread. False. Spreads vary by lender, loan size, and borrower profile.

Myth 4: If I refinance now, I’ll lose money due to legal fees. Not true. Many banks offer subsidies that offset the cost—sometimes entirely.

Myth 5: SIBOR loans are still available if I ask. Nope. MAS has phased out all SIBOR products.

Have questions? Chat with Moshin now for instant mortgage advice, rate comparisons, and loan simulations—100% free, with no pressure to commit.