Unsure About Mortgage Rates? – How Anchoring Bias Can Hurt!

What if your biggest financial mistake isn’t about numbers but about psychology? In the world of home loans, your mind can play powerful tricks on you. One of the most subtle yet damaging psychological traps in Singapore home financing is anchoring bias.

When you anchor your expectations to past low interest rates, your current mortgage choices may not reflect today’s reality. This bias often leads borrowers to underestimate risks, delay refinancing, or overcommit to loans they can’t comfortably sustain. 

In a housing market where benchmarks have shifted from SIBOR (Singapore Interbank Offered Rate) to SORA (Singapore Overnight Rate Average), understanding the anchoring effect in mortgage decisions is more important than ever. The stakes are high—and so is the cost of getting it wrong.

Understanding Anchoring Bias in Mortgages

Anchoring bias is a cognitive shortcut that causes us to rely too heavily on the first piece of information we receive—the “anchor”—when making decisions. In mortgage decision-making bias, this often means clinging to a historical interest rate, such as the sub-1% SIBOR rates of the past, as a reference point for future expectations.

i. The Psychology Behind Anchoring

• Anchor and adjust: Borrowers start with a reference point (e.g., 1% mortgage rate) and make insufficient adjustments when reality changes.
• Selective accessibility: We recall past low rates more easily than current trends, reinforcing unrealistic expectations.
• Illusion of control: Borrowers feel they can “wait out” high rates because they believe low rates will return.

ii. Anchoring in Financial Decisions

Anchoring bias doesn’t just affect mortgage rates—it’s widespread in financial behaviour:

• Stock investors anchoring on past highs.
• Property buyers overvaluing homes because of older price benchmarks.
• In mortgages, the home loan anchoring effect skews perception of affordability, creating psychological traps in Singapore home financing.

Key Impact Table:

Bias Trigger	Result on Home Loan Choice
Past Low Rates Anchor	Overestimating likelihood of rate drops
Peer Stories	Waiting too long to refinance mortgage in Singapore
Media Headlines	Unrealistic expectation of “normal” returning soon

How Anchoring Shapes Mortgage Decisions

Anchoring bias doesn’t just sit quietly in the background; it actively influences how borrowers in Singapore structure their home loans. This mortgage decision-making bias leads to behaviours that seem rational but are built on flawed assumptions shaped by the home loan anchoring effect.

When buyers see today’s mortgage rates of 2%–2.50% compared to the old anchor of 1%, they perceive current rates as “high” and often delay decisions, hoping for a reversal. However, this delay can mean missing competitive fixed-rate offers or paying more as rates reverse and edge upward.

i. Common Ways Anchoring Affects Home Loan Choices

• Delaying refinancing: Many borrowers postpone refinancing, believing rates will fall back to “normal.” This hesitation can cost thousands over the loan tenure.
• Over-leveraging: Anchored to past low rates, borrowers assume they can afford larger loans. When rates climb, monthly repayments balloon.
• Floating rate preference: A belief that low rates will return makes borrowers avoid fixed packages, exposing them to volatility.
• Misjudging benchmark changes: With the SIBOR-to-SORA shift, anchored borrowers fail to understand the compounding effect of SORA, worsening repayment shock.

Behaviour Influenced by Anchor	Potential Risk
Waiting to refinance	Higher cumulative interest costs
Borrowing more during low-rate era	Increased risk under TDSR (Total Debt Servicing Ratio) rules
Sticking to floating rate packages	Exposure to unpredictable market swings

The Era Of Ultra-Low Rates In Singapore

To understand the depth of anchoring, we need to revisit the past low interest rates effect in Singapore. From the aftermath of the 2008 Global Financial Crisis through the COVID-19 pandemic, Singapore experienced a prolonged period of ultra-low rates. For years, SIBOR-based loans hovered below 1%, making mortgage costs historically cheap. This created a powerful mental reference point for borrowers—a psychological benchmark that persists today.

i. The Decade of Cheap Money – How It All Began

Following the 2008 Global Financial Crisis, central banks worldwide slashed interest rates to stimulate economic recovery. Singapore, being a small, open economy linked to global financial markets, mirrored this trend. The result:

• SIBOR fell sharply and remained at historically low levels for years.
• Mortgage rates often hovered around 0.9% to 1.2%, making property loans incredibly affordable.
• Floating-rate packages tied to SIBOR became the default choice for most borrowers.

Why this mattered:

• Monthly mortgage repayments were low, encouraging buyers to upgrade earlier, buy bigger, or take on longer loan tenures.
• Developers marketed aggressively, highlighting affordability and leveraging the “low-rate era” as a selling point.

This long period created a psychological benchmark that borrowers internalised as “normal,” laying the foundation for home loan anchoring effect.

ii. COVID-19 And The Reinforcement Of Anchors

The ultra-low rate environment intensified during the COVID-19 pandemic. With economies slowing, interest rates plunged further to near-zero globally:

• SIBOR reached record lows below 0.8% in 2020, and many borrowers refinanced into packages at or under 1%.
• Headlines such as “Mortgage Rates at Historic Lows” reinforced the belief that low borrowing costs were here to stay.

This phase cemented the anchor in borrowers’ minds. Many made long-term financial commitments—upgrading homes or leveraging investment properties—based on these historically cheap rates.

iii. Transition to a New Reality – The Shift to SORA

By 2022, global inflationary pressures forced interest rates upward. In Singapore:

• SIBOR surged past 3% by late 2022, shocking homeowners used to sub-1% rates.
• At the same time, the Monetary Authority of Singapore (MAS) announced the gradual phase-out of SIBOR, with SORA becoming the new benchmark.

Here are the some key differences between SIBOR and SORA:

• Calculation method: SORA is based on actual overnight transactions and compounded daily, making it more transparent but also more volatile.
• Adjustment spreads: During the migration period, banks added spreads (0.24%–0.36%), raising costs further.

For borrowers anchored to the old world, this felt like a sudden and unfair shift—even though it reflected global financial realities.

iv. Why This Era Created Today’s Anchoring Bias

• Duration: Over 10 years of ultra-low rates made 1% feel like the permanent norm.
• Behavioural reinforcement: Every refinancing cycle at lower or stable rates strengthened the anchor.
• Lack of stress testing: Many homeowners never considered repayment scenarios beyond 2%, leaving them exposed when rates spiked.

The result? Anchoring bias mortgage in Singapore has become one of the biggest obstacles to rational decision-making today, as borrowers struggle to adapt to a higher-rate environment dominated by SORA home loan benchmarks.

Why Anchoring Persists Despite Market Changes

Even when the market evolves, the anchoring effect in mortgage decisions lingers. Human psychology struggles to let go of familiar benchmarks, and in mortgages, this becomes a financial blind spot. Despite SORA replacing SIBOR and global interest rate trends signalling sustained volatility, many Singapore borrowers still expect a return to “cheap money.”

i. Cognitive Bias And Market Reality

• Status quo bias: People prefer what feels normal, making them slow to adapt to new benchmarks like SORA.
• Optimism bias: Borrowers assume rates will drop soon because “they always did in the past.”
• Confirmation bias: Homeowners seek news supporting their belief that rates will return to historic lows.

ii. Role Of Media And Peer Influence

• Media headlines: Phrases like “rates hit record highs” imply a temporary deviation rather than a structural shift.
• Social proof: Friends who refinanced during the ultra-low era often say, “We got 1%, so you should wait,” reinforcing delays.

Impact Snapshot:

Persistence of Anchor	Consequence
Holding on to 1% benchmark	Avoiding refinancing despite 3–4% prevailing rates
Ignoring new benchmarks	Miscalculating repayment under SORA

This combination of mortgage interest rate bias and peer reinforcement is why anchoring bias remains strong—even when financial logic says otherwise.

Real Consequences of Anchoring in Singapore

Anchoring isn’t just a harmless mental shortcut—it’s a costly financial misstep. For many homeowners, clinging to past low interest rates effect in Singapore creates blind spots that lead to mortgage stress, higher debt exposure, and expensive refinancing delays.

When borrowers believe that the ultra-low SIBOR rates of 0.9%–1% will eventually return, they risk making decisions that are disconnected from reality. The result? Oversized loans, shrinking cash buffers, and thousands of dollars lost due to hesitation. Let’s break this down.

1. Payment Shock and Mortgage Stress

One of the most immediate consequences of the anchoring effect in mortgage decisions is repayment shock. Imagine budgeting based on a 1% rate, only to see it soar to 3.5% under the new SORA home loan environment in Singapore.

Example scenario:

• Original plan: $3,000 monthly at 1%
• Reality at 3.5%: $4,200 or more

That’s a 40% jump in instalments—without a corresponding increase in income.

When household budgets are already tight, this additional burden can lead to:

• Cutting essential spending (education, retirement savings)
• Missed mortgage payments, triggering late fees
• Risk of arrears and foreclosure in worst-case situations

This illustrates how mortgage interest rate bias directly impacts financial stability.

2. Over-Leverage Risks

Anchoring often drives borrowers to take on the maximum allowable loan under TDSR, which caps monthly debt obligations at 55% of gross income. At 1%, this seems affordable—but when rates climb:

• The same loan eats up a much larger share of monthly income
• Cash flow buffers shrink, increasing vulnerability to economic shocks
• Families may face liquidity crunches, forcing fire sales of assets

This psychological bias in home loan decisions creates an illusion of affordability that collapses when rates normalise.

3. Missed Refinancing Opportunities

The mortgage rate psychology in Singapore also affects refinancing decisions. Anchored borrowers often delay refinancing, waiting for a mythical “better deal” that may never come. During this waiting game:

• Banks withdraw promotional packages
• Rates climb further, locking borrowers into higher repayments
• Refinancing costs escalate, wiping out any anticipated savings

Illustrative case:

• Loan amount: $1,000,000
• At 1% interest: $3,215/month
• At 3.5% interest: $4,490/month

That’s an extra $1,275 every month, or over $15,000 annually—simply because of an anchoring-driven delay.

Singapore-Specific Risk Factors

The anchoring effect in mortgage decisions becomes even more pronounced in Singapore due to unique structural, cultural, and regulatory factors. These amplify the risks of mortgage decision-making bias and make it harder for borrowers to adapt when market conditions shift. Let’s examine why Singapore homeowners are particularly exposed.

1. Complexity of Benchmark Changes

The transition from SIBOR to SORA has introduced confusion for many borrowers, making SORA home loan bias in Singapore a growing issue:

• New calculation method: Unlike term-based SIBOR, SORA is a compounded overnight rate, which fluctuates daily. Many anchored borrowers underestimate this volatility.
• Adjustment spreads: Banks added spreads of 0.24%–0.36% during SIBOR-to-SORA conversions. Borrowers fixated on past benchmarks often ignore this added cost.
• Misaligned expectations: Many assume SORA packages will mimic old SIBOR-linked deals, leading to costly surprises when repayments rise.

Factor	Borrower Perception	Reality
SORA behaves like SIBOR	Stable monthly adjustments	Daily compounding → unpredictable moves
Migration cost negligible	No material difference	Adjustment spreads increase loan costs

2. Cultural Tendencies And Peer Benchmarking

Asian markets, including Singapore, display a strong reliance on peer experiences. This reinforces psychological traps in Singapore home financing:

• “My friend got 1% last year, so I’ll wait” – a common refrain among borrowers.
• Heavy dependence on anecdotal advice instead of data-driven decisions.

This behaviour perpetuates the mortgage interest rate bias, making homeowners cling to unrealistic anchors longer than necessary.

3. HDB-to-Private Upgraders And Misplaced Anchors

HDB loans, fixed at 2.6%, create another mental anchor. When upgrading to private property, borrowers assume similar stability, underestimating:

• The volatility of floating SORA loans.
• How payment shocks can strain budgets already stretched by bigger mortgages.

Bottom line: These Singapore-specific elements make anchoring bias harder to overcome—and the financial consequences much steeper.

Breaking Free From The Anchoring Bias

Escaping the home loan anchoring effect starts with recognising it. Anchoring is not just a cognitive error—it’s a behavioural trap with measurable financial consequences. To make smarter Singapore mortgage interest rate decisions, borrowers need actionable strategies.

i. Awareness Is The First Step

Ask yourself:

• What rate do I consider “normal”? 1%? 2%?
• Is this based on current market reality or past conditions?

Understanding your anchor is the key to breaking it. Remember, past low interest rates effect in Singapore was a product of extraordinary global conditions, not a permanent baseline.

ii. Scenario Planning and Stress Testing

• Use mortgage calculators to model repayments at 3%, 4%, and even 5% interest.
• Factor in income shocks and TDSR limits.
• Compare fixed vs floating packages objectively—not emotionally.

Example Stress Test Table:

Loan Amount	1% Rate	3% Rate	4% Rate
$1,000,000	$3,215	$4,216	$4,774

Seeing these numbers in black and white dismantles the false sense of affordability created by anchoring.

iii. Leverage Professional Guidance

Mortgage specialists can help counter cognitive bias home loan in Singapore by:

• Providing neutral analysis and current benchmarks.
• Identifying opportunities to refinance mortgage in Singapore at the right time.
• Educating borrowers on how mortgage rate psychology in Singapore skews decision-making.

Debiasing Checklist:

• Challenge your anchor rate.
• Use MAS-published SORA trends, not peer advice.
• Build a repayment buffer of 30% above current rates.

Breaking free from anchoring isn’t just smart—it’s the difference between financial security and years of unnecessary stress.

Practical Strategies & Checklists For Singapore Borrowers

Understanding anchoring bias mortgage in Singapore is only the first step; applying practical strategies is what protects your finances. In a market where interest rates can swing quickly and psychological bias in home loan decisions leads to costly mistakes, you need a clear action plan to stay ahead.

i. The Practical Game Plan

1. Reassess Your Mental Anchor

• Identify the “magic number” in your head (e.g., 1% or 2%) and accept that it’s history.
• Replace it with a data-driven perspective using current SORA rates and market forecasts.

2. Run Stress Tests Regularly

• Use mortgage calculators to model different scenarios:
  • SORA at 3%, 4%, 5%.
  • Monthly payment under each scenario.
• Incorporate MAS affordability metrics like TDSR (Total Debt Servicing Ratio) for realistic budgeting.

3. Compare, Don’t Assume

• Analyse fixed vs floating vs hybrid packages across multiple banks.
• Look beyond headline rates; consider adjustment spreads, lock-in periods, and refinancing penalties.

4. Plan for Liquidity Buffers 

• Maintain a 6-month cash buffer to absorb payment shocks.
• Avoid over-leveraging, even if TDSR allows it.

5. Set Refinancing Triggers

• Don’t wait for rates to “go back down.”
• Set a clear trigger point (e.g., if current package exceeds market by 0.5%) to refinance mortgage in Singapore promptly.

ii. Quick Checklist for Borrowers

• Identify your old anchor rate and discard it.
• Use updated SORA-based tools for loan planning.
• Lock in a fixed-rate package if volatility worries you.
• Build a repayment buffer for unexpected spikes.
• Review your mortgage every 12–18 months, not every 5 years.

Pro tip: Don’t let the home loan anchoring effect delay action. Every month spent waiting can cost hundreds—sometimes thousands—of dollars.

Final Thoughts

The era of ultra-low rates is over, and with it, the illusion that 1% mortgages are “normal.” Yet the anchoring effect in mortgage decisions continues to trap borrowers in Singapore, leading to missed opportunities, payment shocks, and financial stress.

What you anchor to today determines your financial tomorrow. Instead of looking back, focus on forward planning. Use tools, consult mortgage specialists, and adopt a data-driven approach to Singapore mortgage interest rate decisions.

Get the best home loan Singapore across all major banks and compare mortgage rates with the highest rewards. Enjoy the lowest mortgage loan rates for refinancing home loan or buying a new property!

*The information and publications on this website are not intended to be and do not constitute financial advice from Dollarback Mortgage Pte Ltd.