The money is rarely the problem. The order is.
An upgrade is two transactions that have to line up, and most of the pain comes from running them in the wrong sequence, or from discovering the CPF refund after the deposit has already been promised.
Start with the Minimum Occupation Period
Nothing happens before the MOP is cleared. For a standard flat that is five years from the date you collected keys, and only the time you were genuinely living there counts. If the whole flat was rented out, that period does not count toward it.
Flats launched from the October 2024 exercise onward fall into the Standard, Plus and Prime framework, and Plus and Prime flats carry a ten year MOP along with a subsidy recovery on resale. If your flat predates that, your existing conditions stand.
The MOP is also the gate on buying private property at all, and it applies to owners, spouses and essential occupiers alike.
What you actually clear
This is the number people get wrong, and it is worth doing before you look at a single listing.
Take the sale price. Subtract the outstanding housing loan. Then subtract every dollar of CPF you used for the flat, plus the accrued interest on it.
That last line is the one that surprises people. Accrued interest is what your CPF would have earned had you never touched it, currently 2.5% a year on the Ordinary Account, compounded annually. It runs from the day you first used CPF for the flat until the day the refund is made. It does not stop when the loan is paid off, because it is calculated on what you withdrew, not on what you owe.
On a flat held fifteen years, the accrued interest can run well into five figures. It is not lost money, it goes back into your CPF and you can use it again for the next property, but it is not cash in your hand for the deposit.
If you sell at market value and the proceeds do not cover the loan plus the refund, you are not asked to top up in cash. The shortfall is simply not refunded.
Sell first, or buy first
Both are legitimate. They cost different amounts.
Sell first is cheaper and calmer. You know exactly what you have, no ABSD is paid upfront, and no refund has to be chased. The cost is that you may need somewhere to live in between.
Buy first secures the unit you want, but means finding the ABSD in cash at the point of purchase and claiming it back afterwards. For a Singapore Citizen buying a second residential property that is 20% of the price.
The remission exists, and it is narrower than most people assume. The couple must be legally married at the date of purchase, at least one must be a Singapore Citizen, the new property must be bought in the two of their names only, and neither may own any other residential property beyond the one being replaced. The first property then has to be sold within six months, counted from the purchase date if the new property is completed, or from TOP or CSC, whichever is earlier, if it is still under construction. The refund is claimed within six months of that sale.
IRAS does not grant extensions on that window. That is the whole risk of buying first, and it is why the sale has to be realistic before the purchase is signed.
What the bank will lend
On a first housing loan, up to 75% of the lower of price or valuation, with at least 5% of the purchase in cash and the rest from CPF or cash. With one housing loan still outstanding, that falls to 45%, and the cash portion rises to 25%.
The loan has to fit the Total Debt Servicing Ratio as well: all your monthly debt obligations, this loan included, within 55% of gross monthly income. The bank tests that against a floor of 4% a year, not the promotional rate on the offer letter, so the figure you qualify for is lower than the headline rate suggests.
The Mortgage Servicing Ratio of 30% applies only to HDB flats and to Executive Condominiums bought from the developer, so it drops out of the picture once you are buying a resale condo.
Before you sell the new place
Seller’s Stamp Duty now runs for four years, not three, for property bought on or after 4 July 2025. The rates are 16% in year one, 12% in year two, 8% in year three and 4% in year four.
That is a meaningful change. An upgrade you might need to unwind within three years used to cost 4% at worst. It can now cost 8%.
How long it takes
Three to six months from first valuation to keys is typical when the two transactions are sequenced together. Rushing it is where people pay for bridging they did not need, or accept an offer below what the flat was worth because a completion date is closing in.
The work is in getting the order right at the start. After that it is mostly paperwork.
Figures checked October 2026. ABSD, BSD and SSD rates are set by IRAS, loan limits by MAS, CPF rules by the CPF Board, and flat rules by HDB. These change, sometimes overnight. Nothing here is tax or financial advice, and your own position depends on your profile, your timing and your lender. Check the current figure before you commit to anything.
