Boon Keat ❂ CHIN
Real Estate Consultant | Trusted Advisor with 14+ Years of Experience | Founder of M | MIKE Framework Architect l FCPA (AUS) CA (SIN) MBA
“Buy a second property. Let the tenant pay your mortgage. Passive income for life.”
It is one of the most attractive promises in Singapore property investment.
But there is a problem.
It can make a complicated financial decision sound like a guaranteed wealth-building machine.
In physics, a perpetual motion machine promises endless output without accounting for energy loss. In property, the equivalent promise is that rental income will effortlessly cover every cost of owning an investment property.
The reality? Property has friction. And friction costs money.
1. Rental income is not the same as profit
Many investors compare two numbers:
- Monthly rental income
- Monthly mortgage instalment
If rent is higher than the mortgage, they assume the property generates positive cash flow.
But that calculation is incomplete.
A property owner may also need to account for:
- Mortgage interest
- Principal repayment
- Property tax
- Maintenance fees
- Repairs and replacement costs
- Insurance
- Agent fees
- Vacancy periods
- Financing costs and interest-rate changes
A property can appear profitable on a simple spreadsheet while losing money after its full holding costs are included.
The right question is not, “Can the tenant pay my mortgage?”
It is:
“After every realistic expense, how much income and equity is this property actually generating?”
2. Your mortgage payment does not all become equity
A mortgage instalment consists of both interest and principal.
In the earlier years of a typical amortising loan, a substantial portion of the payment may go toward interest. The exact split depends on the loan amount, interest rate and tenure.
So if your tenant pays $4,000 in rent and your mortgage instalment is also $4,000, it does not mean the tenant is building $4,000 of equity for you every month.
Part of that rent is paying the cost of borrowing.
The property may still appreciate over time. But appreciation is not guaranteed, and it does not eliminate the need to manage cash flow.
Rental income, principal repayment and capital appreciation are three different things. Don’t confuse them.
3. The hidden costs can change the entire calculation
Let’s use a simplified illustration.
| Monthly item | Amount |
|---|---|
| Rental income | $4,000 |
| Mortgage instalment | -$3,800 |
| Maintenance fees | -$400 |
| Property tax | -$300 |
| Monthly cash flow before other costs | -$500 |
The spreadsheet initially showed a $200 surplus.
After just two additional holding costs, the property is losing $500 a month, before repairs, insurance, agent fees or vacancy.
This is why investors must calculate net rental cash flow, not just rental yield or rent minus mortgage.
4. Vacancy is not an exception. It is part of the business.
Tenants move.
A unit may need cleaning, repainting, repairs or time to find a suitable replacement tenant. During that period, rental income may stop, but the mortgage and other expenses continue.
For illustration, one vacant month in a year means losing about 8.3% of that year’s potential rental income, assuming the property would otherwise have been occupied for all 12 months.
That shortfall must be funded by the owner.
A rental strategy that works only when the property is occupied every month is not resilient. It is fragile.
5. Why different investors can fall into the same trap
First-time investors
They may be attracted to the promise of building wealth with “other people’s money” without fully understanding the risks of leverage.
HDB upgraders buying a second property
They may be moving from a relatively familiar housing environment into a much larger financial commitment.
If their plan depends heavily on rental income arriving every month, a vacancy or higher interest rate can place pressure on their household finances.
Experienced investors
They may be relying on a strategy that worked under a different interest-rate environment.
A property purchased when borrowing costs were exceptionally low may have produced a very different result from a similar property purchased today.
A strategy that worked in one market cycle is not automatically suitable for the next.
6. A premium property still needs to pass the numbers test
An integrated development may offer excellent convenience, amenities and lifestyle appeal.
Those features can support tenant demand. But they may also come with higher maintenance costs and a higher purchase price.
A desirable property is not automatically a profitable investment.
The case study discussed in our latest deep dive illustrates why investors need to examine the actual numbers of a specific development rather than relying on generic rental-yield assumptions.
Before buying, ask:
- What is the realistic achievable rent?
- What is the net rental yield after expenses?
- How much of the mortgage payment goes toward principal?
- What happens if interest rates rise?
- Can I cover the mortgage during a vacancy?
- How much cash buffer do I have?
- What is my exit strategy if the numbers no longer work?
If the investment only works under perfect conditions, it may not be the right investment for you.
7. OPM is a tool, not a magic wand
Using Other People’s Money (OPM) can be a powerful financial strategy.
But leverage magnifies both gains and losses. It does not remove risk.
The tenant is not a guaranteed mortgage payer. Rental income is not guaranteed. Property prices do not always rise. And the owner remains responsible for the loan, even when the property is vacant.
A sound investment should be able to withstand realistic stress tests.
The goal is not simply to own more properties. The goal is to build sustainable wealth without putting your financial foundation at unnecessary risk.
So, is buying a rental property still worthwhile?
Yes, it can be.
But the decision should be based on the full investment case, including net income, financing costs, capital appreciation potential, risk tolerance, liquidity and time horizon.
For some investors, a physical property may be suitable.
For others, diversified investments such as REITs or other income-producing assets may offer a different way to gain exposure to real estate, with different risks and trade-offs.
There is no universal answer.
There is only the answer that survives the numbers.
The bottom line
Don’t buy a property because someone tells you:
“The tenant will pay your mortgage.”
Buy only after you understand:
Who pays the interest, who covers the holding costs, who absorbs the vacancy, and whether the investment still works when conditions change.
Because in property investment, the most dangerous assumption is not that prices will rise.
It is believing that the costs will take care of themselves.
Want to evaluate a property beyond the headline rental yield?
Look at the full numbers before committing. A good investment plan should account for both the opportunity and the downside.
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