A property can show a respectable rental yield and still require a substantial monthly cash top-up. Before buying, calculate three separate numbers: gross yield, net operating yield and cash flow after the mortgage. They answer different questions.
This guide uses a hypothetical condo to show the difference. The rent, purchase price, financing and expenses below are assumptions, not a quotation, a market average or a forecast for any development.
Which rental yield are you comparing?
| Measure | Calculation | What it tells you |
|---|---|---|
| Gross rental yield | Full-year scheduled rent ÷ purchase price × 100 | A quick starting comparison before vacancy and bills. |
| Net operating yield | Rent after vacancy and operating costs ÷ purchase price × 100 | What the property produces before financing and personal income tax. |
| Financed cash flow | Rent received minus operating costs and full mortgage instalments | The cash surplus or top-up before income tax and any excluded expenditure. |
Keep the denominator consistent. A yield based on the purchase price is higher than one based on the price plus stamp duties, legal fees and initial furnishing. If comparing two listings, rebuild both calculations on the same basis. A percentage quoted without its assumptions is not enough to choose a property.
A worked example: 3.84% gross becomes 2.52% before financing
Assume a completed condo costs S$1.5 million and can be rented for S$4,800 a month. For planning, allow one vacant month in the year. This is an illustrative allowance, not a claim about typical vacancy.
| Item | Annual amount |
|---|---|
| Scheduled rent: S$4,800 × 12 | S$57,600 |
| One month without rent | −S$4,800 |
| Rent received | S$52,800 |
| Property tax, assuming assessed Annual Value of S$42,000 | −S$6,000 |
| MCST charges, assumed S$400 a month | −S$4,800 |
| Insurance | −S$360 |
| Repairs and upkeep budget | −S$1,200 |
| Letting-fee allowance | −S$2,616 |
| Total operating costs | S$14,976 |
| Net operating income | S$37,824 |
Gross yield: S$57,600 ÷ S$1,500,000 × 100 = 3.84%. Net operating yield: S$37,824 ÷ S$1,500,000 × 100 = 2.52%, rounded.
The letting allowance assumes a negotiated, all-inclusive fee of S$5,232 spread over two years for budgeting. It is not a standard commission rate. The actual payment may fall entirely in the first year, so a cash calendar will differ from this smoothed budget. CEA explains that commission is negotiable. Record the agreed fee, tax treatment and payment timing in the estate agency agreement.
Check the actual MCST statement and planned works. A repair allowance is money set aside, not proof that repairs will cost that amount. A special levy, major appliance replacement or an unexpectedly long vacancy can make this budget inadequate. Our condo maintenance guide explains which records to request.
Why a positive yield can still mean negative cash flow
Now assume a S$1.125 million loan, a constant 3.5% annual interest rate and a 25-year term, repaid monthly. This is a calculation assumption, not a current loan offer or confirmation that a buyer qualifies for this loan.
The monthly repayment is approximately S$5,632, or S$67,584 a year. Subtracting that from S$37,824 of net operating income produces a S$29,760 annual cash shortfall, about S$2,480 a month, before personal income tax and major works.
The full repayment includes principal and interest. Once the full instalment has been deducted, do not subtract interest again. Principal repayment reduces the loan balance: it uses cash, but it is not the same as an operating expense. A cash shortfall is therefore not, by itself, the investment’s economic loss or its taxable loss.
Run a downside case before committing. If rent falls to S$4,300 and the unit is vacant for two months, receipts become S$43,000. Holding the S$14,976 operating budget constant for comparison gives S$28,024 before financing and approximately S$39,560 negative cash flow. In practice, fees and repairs may also change. Neither scenario includes capital gains or losses.
Set aside a reserve that you can actually access when bills fall due. A theoretical future sale profit cannot pay next month’s instalment. For a home you occupy yourself, the benefit is somewhere to live; hypothetical rent should not be entered as cash received.
A positive operating yield can hide an early cash squeeze
The annual budget spreads a letting fee over two years, but the bank account has to meet the actual bill when it arrives. The same is true of insurance, repairs and property tax. A monthly average is useful for comparing investments; a dated payment schedule determines whether you can keep the property funded.
Separate timing illustration using the same property: Assume a S$21,000 accessible landlord reserve after purchase and all acquisition costs. In Month 1 there is no rent. For this stress test only, the full assumed S$6,000 annual property-tax bill, S$360 insurance premium and S$5,232 all-inclusive letting fee fall due that month. The monthly mortgage is rounded to S$5,632 and MCST contributions to S$400. This concentration of bills is hypothetical, not a statutory payment timetable or a typical fee schedule.
| Period and cash movement | Reserve left |
|---|---|
| Start: S$21,000 reserve | S$21,000 |
| Month 1: S$17,624 paid, no rent | S$3,376 |
| Month 2: S$4,800 rent less S$6,032 mortgage and MCST | S$2,144 |
| Month 3: same assumed S$1,232 shortfall | S$912 |
Without a top-up, another occupied month on those assumptions would take the reserve S$320 below zero. The property can have positive operating income before financing while requiring regular money from the owner. The S$21,000 reserve does not make that ongoing shortfall disappear.
Repairs, income tax and major works are excluded from this short calendar and remain additional. The S$1,200 repair allowance in the annual budget has not been spent in these three months. Do not deduct it as both a cash payment here and an untouched reserve. Equally, the S$5,232 fee in Month 1 replaces the smoothed S$2,616 annual allowance for this timing exercise; it is not added on top of another payment for the same service.
Build your own calendar from the actual loan debit, tenancy receipts, tax bill, estate statement and contracts. Test one later tenant start and one essential repair. Keep any refundable tenant deposit separate from the owner’s available spending balance. The useful reserve is the amount still accessible after committed bills, alongside a sustainable source for the expected monthly top-up.
Use the actual property-tax assessment
For an ordinary residential property that is not owner-occupied, the current progressive rates are 12% on the first S$30,000 of Annual Value, 20% on the next S$15,000, 28% on the next S$15,000 and 36% above S$60,000. The example’s S$42,000 assessment therefore gives S$3,600 + S$2,400 = S$6,000. It is not a flat 12% tax on rent. See the IRAS property-tax rates.
Annual Value is IRAS’s estimate of annual market rent excluding furniture, furnishings and maintenance fees. It is not a fixed percentage of your signed rental contract. Get the assessment rather than estimating it as 60% or 70% of rent. See IRAS’s Annual Value explanation and our property-tax guide with 2026 rebates.
Rental income tax is a separate calculation
Eligible individual landlords can generally use deemed rental expenses of 15% of gross rent, plus qualifying mortgage interest, or claim actual allowable expenses instead. Do not claim both the 15% allowance and the same actual expenses. Loan principal is not deductible. Repairs, improvements, vacant periods and different ownership arrangements have specific treatment; check the IRAS rental-income guidance.
The 15% option is a tax simplification, not evidence that your real costs will be 15%. Likewise, money merely reserved for future repairs is not an expense already incurred. Calculate taxable rental income separately from the operating budget, then estimate income tax using your own circumstances. That amount still needs funding even if mortgage principal makes the property’s cash flow negative.
How to test the rent before buying
- Start with completed rental contracts. Use URA’s private residential property data to investigate the development and comparable units. Asking rents are a negotiating position, not proof of a completed lease.
- Compare genuinely similar homes. Note size, bedroom configuration, contract date and any known differences in condition or furnishing. A larger unit’s rent does not establish what a smaller unit will earn.
- Inspect the tenant’s everyday experience. Check usable bedrooms, storage, heat, noise, transport connections and the condition of appliances. Record what you personally checked and what remains an assumption.
- Budget the changeover. Allow for cleaning, repairs, marketing and a gap between tenants. If buying with a tenant, have the tenancy, deposit, rent-payment history and handover obligations checked.
- Separate a new launch’s future rent from today’s cash flow. A unit that is not ready to let does not generate the assumed rent during construction. Model completion, fitting out and finding a tenant as separate stages.
Do not choose a district simply because a table labels it “high yield”. The useful comparison is between properties you could actually buy, at defensible prices, with achievable rents and expenses you have checked.
Confirm the letting plan before relying on rent
For a private home, establish the approved residential use and applicable letting conditions against URA’s rental rules. This example does not establish an HDB flat’s or executive condominium’s rental eligibility. A future letting is a separate scenario from the cash needed before the property is ready for occupation.
Questions to settle before making an offer
- What evidence supports the rent, and what happens if it is lower?
- Have I allowed for vacancy, property tax, MCST charges, repairs, insurance and letting costs?
- Can I fund the mortgage and tax bill during a difficult year without a forced sale?
- Am I comparing returns on purchase price or on the full acquisition cost?
- Does the property’s permitted use fit the letting plan?
A lower advertised yield with documented costs may be easier to assess than a higher one built on optimistic rent and missing bills. The purchase decision should survive a realistic cash budget before any assumption about capital appreciation is added.
Updated 25 October 2026. Calculations are hypothetical and rounded. Earlier unsupported market-yield averages and fictional investor anecdotes remain withdrawn.
Photograph: Singapore River at Robertson Quay, 14 August 2022, Wzhkevin, CC BY-SA 4.0. Source: commons.wikimedia.org/wiki/File:Singapore_River_at_Robertson_Quay_-_2022-08-14.jpg. Licence: creativecommons.org/licenses/by-sa/4.0/. Resized for web and displayed cropped. Neighbourhood context, not an example property.
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