For some private homeowners, the removal of the 15-month wait-out period has reopened a property option that may previously have been too troublesome to seriously consider.

Since late July 2026, eligible private residential property owners and former owners buying a non-subsidised HDB resale flat without an HDB housing loan no longer need to observe the 15-month wait. An existing private homeowner may also proceed with the HDB purchase first, provided the private residential property is subsequently disposed of within six months of completing the flat purchase.

For someone sitting on a condo that has appreciated substantially over the years, the possibilities are obvious. Sell the private property, move into an HDB flat that still meets the household's needs, and potentially free up a sizeable amount of housing equity for retirement.

But the removal of the wait changes when you can make the move. It does not tell you whether the move actually leaves you financially better off.

A $1.8 million condo and an $850,000 resale flat may appear to create a $950,000 opportunity at first glance. Once the outstanding mortgage, CPF housing refund, purchase funding, stamp duties and transaction sequence are considered, however, the amount you truly unlock can look quite different.

So if you are seriously considering moving from a condo back to an HDB flat, these are the numbers that matter.

There is one important detail that can easily be missed in the headlines.

Before the 15-month wait-out period was removed, Singapore Citizens aged 55 and above and their spouses were already exempt from the restriction if they were moving from private residential property into a 4-room or smaller non-subsidised resale flat without taking an HDB housing loan.

That means a 60-year-old condo owner who had always intended to buy a 3-room or 4-room resale flat did not suddenly gain this option in July 2026.

The latest change is more consequential for private homeowners below 55 who may already be considering their next phase of housing, as well as older homeowners whose preferred replacement home falls outside the previous exemption.

There are still boundaries. The 30-month wait-out requirement continues to apply in situations such as buying a flat directly from HDB, purchasing certain subsidised resale flats, taking an HDB housing loan or buying a new Executive Condominium.

So before evaluating whether condo-to-HDB right-sizing makes financial sense, establish that the particular HDB route you are considering actually falls within the new rules.

Once it does, the next question is where the maths becomes much more interesting.

Suppose David and Elaine are both 52. Their children are becoming increasingly independent and they own a condominium currently worth around $1.8 million.

They are considering an $850,000 resale HDB flat.

At first glance:

$1.8 million condo - $850,000 HDB = $950,000

It is tempting to view that $950,000 as the amount available for retirement.

But suppose the condo still carries a $250,000 mortgage and David and Elaine have used $400,000 in CPF savings, including accrued interest that would need to be refunded upon sale.

Their starting calculation would look more like this:

When a property is sold, the sale proceeds are first used to repay the outstanding housing loan and make the required CPF housing refund. In general, the CPF amount to be refunded comprises the principal withdrawn for the property and the accrued interest; additional refund requirements may apply to certain members aged 55 and above who have pledged their property towards their retirement sum.

The $400,000 going back to CPF has not disappeared. For David and Elaine, who are below 55 in this example, the housing refund would generally return to their Ordinary Accounts and could potentially be used towards another property, subject to the prevailing CPF housing rules and limits.

If they subsequently use that $400,000 of CPF towards the $850,000 HDB purchase, alongside $450,000 in cash, the broad picture becomes:

$1.15 million cash proceeds - $450,000 cash used for the HDB = $700,000

That $700,000 is still before costs such as legal fees, applicable stamp duties, agent fees, renovation, moving expenses and other transaction costs.

The example is simplified, but it illustrates an important distinction. The $950,000 difference between property prices and the cash that ultimately becomes available after the entire move are not necessarily the same number.

Before deciding whether selling the condo will meaningfully improve your retirement position, calculate the latter.

The CPF calculation becomes even more important when the homeowner is approaching 55.

For members below 55, CPF housing refunds are generally credited back into the Ordinary Account. Once a member is aged 55 and above, housing refunds are first used to top up the Retirement Account towards the Full Retirement Sum (FRS), with the remaining refund staying in the Ordinary Account.

Consider the same $400,000 CPF housing refund in David and Elaine's example.

At 52, that refund would generally return to their OAs, where it could potentially be redeployed towards the next property subject to CPF housing rules.

If they make the move after 55 and their Retirement Accounts have not yet met the applicable Full Retirement Sum (FRS), part of the housing refund may instead be channelled there first. Their condo may sell for exactly the same price, but the amount immediately available in their OAs for the replacement home could be different.

This does not mean that the money has been lost. It means more of it has been set aside to support retirement.

There are also specific provisions for eligible homeowners aged 55 and above buying a 3-room or smaller HDB flat. CPF allows Retirement Account refunds above the Basic Retirement Sum (BRS) to be used towards such a property purchase if the relevant conditions are met: the replacement flat must be bought within three years of selling the previous property, it must cost less than the previous property's selling price, and the member must not yet have been issued a CPF LIFE plan.

The broader lesson is that "Should I sell at 52 or 58?" is not purely a property-market question.

Crossing 55 can change how CPF savings flow through the transaction. Someone considering a move within the next few years should therefore understand their CPF position alongside their property's estimated sale proceeds rather than treating the two as separate decisions.

This is another area where the removal of the 15-month wait makes the move easier, but does not eliminate the need for planning.

Under the current rules for the eligible non-subsidised resale route, an existing private homeowner may purchase the HDB flat first and dispose of the private residential property within six months of the HDB resale completion.

For some homeowners, buying first is appealing. They can secure the HDB flat they want, renovate it and perhaps move directly from one home to the next without needing temporary accommodation.

But there is a financing question hiding inside that convenience.

If much of your available CPF remains tied to your condo and most of your cash is expected to come from its eventual sale, how will you fund the HDB purchase before those proceeds are released?

Return to David and Elaine.

If they sell the condo first, the mortgage can be discharged, the CPF refund can be processed and the net cash proceeds become clearer before they commit to the next property.

If they buy the $850,000 HDB first, however, the $400,000 of CPF in our example has not yet been refunded because the condo has not been sold. The expected $1.15 million of cash sale proceeds has not arrived either.

They may therefore need considerably more existing cash or other financing to complete the HDB purchase first. There is also a bank-loan consequence to retaining the condo mortgage. For an individual with one outstanding housing loan, current bank loan-to-value limits are generally 45%, falling to 25% where the lower-LTV conditions apply; the minimum cash downpayment is 25%. By comparison, the normal maximum LTV is 75% where there is no outstanding housing loan. On an $850,000 HDB purchase, that can mean a much larger upfront funding requirement than a buyer may expect if the condo loan is still outstanding.

This is why the disappearance of the 15-month wait should not be confused with the disappearance of the funding gap between two transactions.

For some households, selling first produces greater financial certainty. For others, buying first may be worth the temporary liquidity requirement because the right replacement flat is difficult to find.

The better sequence depends not merely on which market you think will move first, but on whether your finances can comfortably support the overlap.

The stamp-duty position can also sound more alarming than it necessarily is.

HDB purchases are subject to specific ABSD remission rules because HDB regulations already require buyers to dispose of other residential property within the stipulated period. Where the applicable conditions are met, the remission can reduce or remove the additional stamp-duty burden that might otherwise arise from owning another residential property at the point of purchase.

This does not mean stamp duties can be ignored altogether. Buyer's Stamp Duty still forms part of the acquisition cost, and the precise treatment can depend on the buyers' citizenship and ownership circumstances.

But for many right-sizers, the more immediate transaction constraint is likely to be cash flow and CPF availability, rather than simply assuming that buying the HDB before selling the condo automatically creates an enormous ABSD bill.

That distinction matters when planning the order of the two transactions.

One concern surrounding the removal of the 15-month wait has been whether former private-property owners will rush into the HDB resale market and reignite price growth.

The timing of the policy change provides some context. HDB resale prices declined by 0.1% in Q1 2026, followed by another 0.3% decline in Q2, after several consecutive quarters of moderating price growth.

The newly eligible demand pool is also narrower than it first appears. Older owners moving into 4-room or smaller flats already had an exemption, while households seeking subsidised housing or an HDB housing loan remain subject to other eligibility conditions.

None of this guarantees that the particular HDB flat you want will become cheaper. A newer 5-room flat near an MRT station can behave very differently from an older flat elsewhere, just as one condo project can perform very differently from another.

That is why a homeowner moving between the two markets should arguably focus on something more useful than either headline index alone.

Suppose your condo is worth $1.8 million today and the type of HDB flat you intend to buy typically costs around $850,000.

The gross price gap is:

$950,000

Now imagine both markets move over the next two years.

If comparable condos rise to $1.9 million while your target HDB segment rises to $900,000, the gap becomes $1 million. Waiting may have worked in your favour, even though the HDB flat itself became more expensive.

But if your condo remains at $1.8 million while suitable HDB flats rise to $900,000, the gap falls to $900,000.

The HDB buyer sees a $50,000 increase. The right-sizer should see something else: $50,000 less gross housing equity available to be released through the move.

These are deliberately simplified examples, but they show why asking only whether "condo prices will rise" or "HDB prices will fall" misses the interaction between the two transactions.

A right-sizer is simultaneously a seller in one market and a buyer in another.

Private residential performance is itself far from uniform. In Q2 2026, overall private residential prices rose by 0.5%, but non-landed prices slipped by 0.1%. Within the non-landed segment, prices rose by 1.8% in the Core Central Region, declined by 1.2% in the Rest of Central Region and eased by 0.1% in the Outside Central Region.

So the relevant comparison is not simply "private versus HDB".

It is the condo you actually own versus the HDB flat you would realistically buy.

Source: PropNex Investment Suite, URA.gov.sg

Waiting can sound attractive if you expect your condo to appreciate further. But delaying the decision changes more than one variable.

Your outstanding mortgage may fall, which could improve your eventual net sale proceeds. Your condo may appreciate, but the HDB segment you are targeting could appreciate too. Your CPF accrued interest continues to build while CPF remains deployed for housing, affecting the eventual refund amount. If you cross age 55 during that period, the treatment of those housing refunds may also change.

There is therefore no single market forecast that can answer whether waiting is better.

Imagine two homeowners with identical $1.8 million condos.

The first still owes a substantial mortgage, has significant CPF tied up in the property and intends to retire within a few years. The second owns the condo outright, has ample retirement assets outside property and has no immediate need for liquidity.

Even if they have identical expectations for condo prices, the financial value of selling today can be completely different.

That is why the decision should be judged against the household's own balance sheet rather than on whether the private market is expected to gain another few percentage points.

The question is not simply:

"Can my condo still go up?"

It is:

"What do I gain by keeping this amount of wealth in the condo for another two or three years, and what do I give up by not releasing it today?"

That is an opportunity-cost calculation, not merely a property forecast.

Before deciding whether a condo-to-HDB move makes financial sense, work through these four numbers first.

Taken together, these four numbers give you a more realistic picture of what moving from a condo to an HDB flat could actually change financially. The key is not simply the difference between the two property prices, but what remains after your mortgage, CPF movements, purchase costs and other expenses have been accounted for.

Only then can you assess whether the move meaningfully strengthens your retirement position.

Those four numbers provide a useful baseline. But property decisions rarely come down to one calculation.

A homeowner considering a condo-to-HDB move may simultaneously be asking whether to sell now or wait, whether the replacement home is affordable without overstretching, how CPF should be deployed, what market movements mean for the price gap, and what the decision leaves open for the next five, 10 or 20 years.

For homeowners who want to examine those trade-offs in greater depth, PropNex's Property Wealth System (PWS) offers a structured way to assess their options through a PWS Pressure-Test. This framework helps homeowners evaluate their current property position, test different property strategies against their financial goals and consider how each decision may affect their future property wealth.

The 15-month wait-out period once forced many private homeowners to think carefully about whether moving back into the HDB resale market was practical at all.

For eligible buyers, that particular obstacle has now been removed.

What remains is arguably the more important question.

Does selling the condo improve the way your wealth is positioned for the next stage of your life?

The answer will not come from the condo's selling price alone. It depends on the mortgage still attached to it, how much CPF has been used, your age when you sell, the HDB you genuinely want, how the two market segments are moving relative to one another and what you intend to do with the capital that is ultimately released.

If you are still deciding whether a smaller home fits your retirement lifestyle in the first place, that is a broader right-sizing conversation. But once you have reached the point where condo to HDB is a serious option, the next step is to put the transaction itself under the microscope.

The policy change tells you that you may no longer have to wait 15 months.

Your numbers should tell you whether the move is worth making.