7 Common Mortgage Mistakes First-Time Buyers Make | Homejourney

Many first-time buyers in Singapore focus on finding the "perfect" flat or condo and only think about the mortgage at the last minute. That is exactly how the most common mortgage mistakes first time buyers make happen – over-borrowing, misusing CPF, or locking into the wrong loan package that strains cash flow for years.

This focused guide is part of Homejourney’s first-time buyer finance series and supports our main pillar on Singapore home loans and affordability . It distils the most frequent pitfalls I see among young couples buying their first home in estates like Punggol, Sengkang and Bukit Panjang, and shows you how to avoid them using clear rules, real numbers, and Homejourney’s mortgage tools.

1. House-Hunting Before Knowing Your Loan Eligibility

One of the biggest mistakes first-time buyers make is viewing showflats and resale units before checking how much they can actually borrow. In Singapore, your real budget is capped by MAS rules like the Total Debt Servicing Ratio (TDSR) and, for HDB, the Mortgage Servicing Ratio (MSR).

Key concepts to understand first:

TDSR: Your total monthly debt repayments (including all housing, car, student loans, and credit cards) generally cannot exceed 55% of your gross monthly income under MAS rules.
MSR (for HDB/BTO/EC): Your housing instalment alone usually cannot exceed 30% of your gross monthly income for HDB loans and ECs bought with HDB rules.
Loan-to-Value (LTV): The maximum percentage of the property price or valuation you can borrow – generally up to 75% from banks for a first housing loan, assuming you meet all criteria.

What this means on the ground: a couple earning $8,000 combined and with no other loans may think they can comfortably afford a $900,000 resale flat near Tiong Bahru MRT, but once TDSR and MSR are applied, their approved loan may only support a $750,000–$800,000 property, especially with today’s higher interest rates.

Actionable safeguards:

Before you view any units, use Homejourney’s mortgage eligibility calculator at Bank Rates or Mortgage Rates to estimate your maximum loan based on income, existing debts, and age.
Get an IPA (In-Principle Approval) from a bank if you are buying a private property or EC. This gives a written indication of the maximum loan amount, valid for a few months.
For HDB buyers, apply for an HDB Flat Eligibility (HFE) letter on the HDB portal before you commit to any purchase. It confirms your eligibility and the HDB loan amount (if applicable).

Homejourney makes this safer by allowing you to view current rates from all major banks and calculate your borrowing power in one place at Bank Rates , so you do not fall in love with a home you cannot finance.

2. Underestimating Total Home Ownership Costs

Another very common mistake is planning only for the monthly mortgage instalment and ignoring other recurring costs. In Singapore, first-time buyers in areas like Tampines, Woodlands or Jurong West are often surprised by the combined cost of property tax, insurance, service & conservancy charges (S&CC) for HDB, condo MCST maintenance fees, and utilities.

Typical monthly cost breakdown for a first home (illustrative, will vary by estate and flat size):

HDB 4-room in Punggol: $2,100 mortgage + $80 S&CC + $200 utilities + $50 home insurance + sinking fund for repairs (e.g. $100) = around $2,530/month.
Mass-market condo in Sengkang: $3,000 mortgage + $300–$400 MCST fees + $250 utilities + $80 insurance = around $3,630–$3,730/month.

The danger is stretching your monthly instalment to the maximum allowed by TDSR or MSR and leaving no buffer for these costs, or for interest rate increases.

Safe-practice guidelines:

Keep your total housing costs (mortgage + fees + insurance) within 25–30% of gross household income, even if TDSR allows more.
Maintain an emergency fund of at least 6 months of total home-related expenses in cash or easily accessible savings.
Use Homejourney’s calculator at Bank Rates to model not just monthly instalments today, but also “stress test” scenarios if interest rates rise by 1–2%.

If your budget is tight, consider starting with an HDB flat further from the city (for example in Yishun, Sembawang or Bukit Batok) instead of a small private unit near the CBD – very often the total monthly outlay is significantly lower while giving you more space.

3. Mismanaging CPF and Cash When You Save for Down Payment

The way you save for down payment and structure your funds between CPF and cash has long-term consequences. Many first-time buyers focus only on “how to pay the option fee now” and overlook future resale and retirement impact.

Key Singapore rules to remember:

For a bank loan on a first property, at least 5% of the purchase price must be in cash. The next 20% can be a mix of CPF OA and cash, subject to LTV limits.
You can use CPF OA for down payment, stamp duties, and monthly instalments, but this builds up accrued interest that must be refunded to your CPF when you sell, with interest.
If you use too much CPF and very little cash, you may face a shortfall when upgrading later because of the large CPF refund requirement at resale.

Common missteps with CPF usage:

Using all available CPF OA for the down payment and stamp duties, leaving no buffer for future instalments.
Relying almost entirely on CPF and not maintaining enough cash savings for emergencies or job loss.
Not realising that heavy CPF usage reduces your CPF balances for retirement and may require more cash top-up later.

Down payment tips and first home savings strategy:

Set a target to keep at least 12 months of mortgage instalments in CPF OA or cash after completion – a strong safety buffer.
Use a blended approach: not 100% CPF, not 100% cash. For many young buyers, a 60–70% CPF / 30–40% cash mix for down payment and costs balances flexibility and retirement savings.
Start property deposit savings early by allocating a fixed portion of salary into a separate high-yield savings account and topping up CPF OA via voluntary contributions if appropriate.

When you plan your home buying savings, think beyond just reaching the minimum down payment. On Homejourney, you can simulate different down payment combinations using our calculator at to see how CPF vs cash usage changes your monthly instalment and long-term flexibility.

4. Choosing the Wrong Loan Type or Fixing at the Wrong Time

Another classic mistake is choosing a mortgage package purely based on today’s “headline rate” without understanding how SORA-based floating packages differ from fixed-rate packages, or how often rates can reset.

Basic loan types in Singapore:

Fixed-rate loans: Interest rate is locked (e.g. 2 or 3 years), giving payment stability but usually slightly higher rates at the start.
Floating-rate loans: Pegged to benchmarks like 3M or 6M SORA, plus a fixed margin (e.g. 3M SORA + 0.8%). Your rate and monthly instalment will be reviewed at each reset period.

In a rising-rate environment, a pure floating loan can lead to meaningful increases in monthly payments, especially for loans above $600,000 (common for private condos in city fringe areas like Geylang and Queenstown).

The chart below shows recent interest rate trends in Singapore:

Homejourney tracks live SORA movements so you can see how current rates compare with the past months, helping you decide whether a fixed or floating package better fits your risk tolerance.

Mistakes to avoid:

Taking the lowest promotional rate without checking the spread after the lock-in period, which may jump significantly.
Assuming you will definitely refinance later, but ignoring lock-in penalties, legal fees, or possible future changes to your income.
Not understanding that bank packages differ widely across DBS, OCBC, UOB, HSBC, Standard Chartered, Maybank, CIMB, RHB Bank, Public Bank, Hong Leong Bank and Citibank.

Practical steps for safer decision-making:

Use Homejourney’s bank rates comparison at Bank Rates to compare fixed vs SORA-based packages from all major banks side by side.
Check not just the first-year rate but at least 3–5 year cost, including any repricing margins after the lock-in period.
If you have unstable income (e.g. self-employed, commission-based), a fixed-rate loan for the first 2–3 years may provide better cash-flow stability.

5. Ignoring TDSR/MSR and Other Loans (Car, Renovation, Credit Cards)

Many first-time buyers in Singapore take on new debts – car loans, buy-now-pay-later instalments, or renovation packages – just before or after applying for a home loan. Because of TDSR and MSR, these extra commitments can either reduce your housing loan eligibility or cause stress when interest rates rise.

Example from real life:

A couple earning $9,000 combined decided to buy a resale 4-room flat in Queenstown. Before getting their IPA, they took a $1,000/month car loan. Under TDSR, this reduced their maximum property loan by more than $150,000, forcing them to drop units within walking distance of Queenstown MRT and look further out in Clementi instead.

Rules of thumb:

Avoid taking any new major loans (car, renovation, personal loans) 6–12 months before applying for a mortgage.
Clear high-interest debts (credit cards, personal loans) as far as possible before your mortgage application – this improves both approval chances and your stress test.
Use Homejourney’s eligibility calculator at to see how each new loan affects your permissible housing instalment under TDSR.

Remember that banks and HDB may re-check your income and debts near completion. Sudden large new commitments can trigger a reassessment or, in extreme cases, a loan reduction.

6. Overstretching for Location and Ignoring Long-Term Plans

Because many of us grew up hearing that “property prices always go up,” first-time buyers sometimes overstretch to secure a unit in a trendy area – for example, paying top dollar for a small unit near Tanjong Pagar or Bugis MRT – assuming future appreciation will bail them out.

However, future prices are uncertain and depend on broader economic conditions, supply of new launches, and policy changes like cooling measures. Overstretching can affect your life choices for years – delaying having children, reducing retirement savings, or restricting job flexibility.

Better decision framework:

Start with life plans: How long do you expect to stay in this home? Are you planning children in 3–5 years? Do you anticipate supporting elderly parents?
Match property type: For young couples planning a family, a slightly further HDB 4-room in estates like Sengkang or Bukit Panjang may make more sense than a compact 1-bedder in the CBD.
Stress-test income: Assume at least one partner may have income disruption (career change, further studies, maternity/paternity leave). Can you still meet instalments?

Homejourney’s property search at Property Search lets you filter properties by budget and location, so you can find options that suit both your financial limits and lifestyle needs instead of chasing the maximum bank-approved price.

7. Not Comparing Banks or Using a Trusted Broker

A final common mistake is going straight to the bank where you already have a savings account and taking the first mortgage package offered, without comparing alternatives. In Singapore, different banks often price their home loans differently even on the same day.

The difference between a 3.1% and 3.4% effective rate on a $700,000 loan over 25 years can add up to tens of thousands of dollars over the life of the loan. Yet, many first-time buyers never see that comparison presented clearly to them.

Why using Homejourney protects you:

You can compare offers from DBS, OCBC, UOB, HSBC, Standard Chartered, Maybank, CIMB, RHB Bank, Public Bank, Hong Leong Bank, Citibank and more on a single, transparent dashboard at Bank Rates .
Our Homejourney Mortgage Brokers review your profile and explain trade-offs honestly – not just the lowest rate, but lock-in conditions, prepayment penalties, and repricing options.
You can submit one application to multiple banks via Bank Rates , using Singpass/MyInfo to auto-fill your details, which reduces errors and speeds up approval.

This multi-bank approach cuts the risk of missing a better package elsewhere and helps you find a mortgage that is safer and more sustainable, not just cheaper in year one.

Singapore-Specific Regulatory Checks You Should Not Ignore

On top of common behavioural mistakes, many first-time buyers are not familiar with Singapore’s regulatory framework, which directly affects how much they can borrow and what they must pay upfront.

Key items to verify early:

Additional Buyer’s Stamp Duty (ABSD): As a first-time Singapore Citizen buying your only residential property, ABSD is usually 0%, but situations involving PRs or existing property ownership differ. Always check IRAS’ latest ABSD tables before committing.
Buyer’s Stamp Duty (BSD): Payable on all property purchases, calculated in tiers. Factor BSD into your property deposit savings plan; it can easily exceed $20,000–$30,000 for typical condo purchases.