They Bought the BUC and Forgot the Progressive Payments

Wei and Hui — an illustrative composite, not real clients; the figures below are computed from stated assumptions — did everything the sensible way. They bought a S$1,800,000 two-bedroom at a launch still under construction, put 25% down as equity, took a 75% loan, and read the progressive payment schedule carefully. What they took from it was the reassuring part: you pay as it's built, and the middle stretch is gentle. They budgeted around that gentle stretch. Eighteen months later they were quietly refinancing a car loan and asking parents for a bridging float, because the building had gone up faster than the brochure implied and every payment tied to it had arrived early. Nothing went wrong with the purchase. Their cash-flow plan was built on a timeline they did not control. Here is exactly where it broke. Methodology published. No spin.

The plan on paper

The mechanics of the progressive payment scheme were not the problem — Wei and Hui understood them. On their S$1,800,000 purchase, as Singapore-citizen first-timers:

• Loan: 75% loan-to-value = S$1,350,000; equity S$450,000.
• Up front, before the loan draws a cent: 5% booking (S$90,000, which must be cash), the balance to 20% (S$270,000) within eight weeks, and Buyer's Stamp Duty of S$59,600 — about S$419,600 out the door in the first two months.
• After that, the loan takes over on a reverse-waterfall basis: their last S$90,000 of equity funds half the 10% foundation payment, and the bank funds everything from there.

They had roughly S$520,000 in combined cash and CPF. The S$419,600 up front was tight but survivable; it left them about S$100,000. Their plan for the rest: the remaining S$90,000 of equity, plus the rising monthly instalments, would be funded from savings topped up by two annual bonuses they expected before those stages arrived. On the sales-gallery timeline — foundation around month 12, the superstructure stages spread across years two and three — that plan had slack. The assumption buried inside it was that construction would take its time.

Where it actually broke

It didn't take its time. The contractor was quick, and progressive payments are triggered by a certified milestone, not a calendar date — so when the structure went up fast, the bills went out fast. The stages that Wei and Hui had mentally spread over two-and-a-half years landed in about thirteen months:

Two things hit at once. First, their last S$90,000 of equity fell due at month 7, not month 12 — before the first of the two bonuses they had earmarked for it had even been paid. The money existed on a spreadsheet in the future; the developer wanted it in the present. That is the whole crunch in one line: they had budgeted future income against a payment whose timing they did not set.

Second, because you are charged interest only on what the bank has actually disbursed, the monthly cost ramped far quicker than modelled. At an illustrative floating rate of 2.3% a year:

The gentle "a couple hundred dollars a month" they had read about was real — for about four months. By month 20 they were paying roughly S$1,208 a month in interest on a still-unfinished flat they could not yet live in or rent out, on top of their existing home's costs. None of these numbers is large in isolation. Compressed into thirteen months and landing before the income meant to cover them, they were a squeeze.

What the crunch was — and wasn't

It is worth being precise, because it is easy to draw the wrong lesson. Wei and Hui were not underwater and the home was not unaffordable. The total sums were exactly what they had signed for; the scheme did what it says. What failed was sequencing — matching the timing of cash out to the timing of cash in. They treated the progressive schedule's dates as fixed and their income as certain, when in reality the schedule's dates float with the build and their bonuses were the uncertain part.

The far bigger number was still ahead of them, too. Once the project hits CSC — legal completion — the full loan of S$1,350,000 converts to principal-and-interest, about S$5,921 a month at 2.3% over 25 years, and closer to S$7,351 if the floating rate drifts up to 4.3% by completion. The interest-only ramp during construction is a grace period, not the real payment. A household stretched by a S$1,208 construction-stage bill has a warning it cannot afford to ignore about the S$5,921 that starts at handover.

What to actually do with this

Hold the equity liquid from day one — don't earmark it against a milestone. The single fix for Wei and Hui's crunch was to have their full S$450,000 of equity available at the start, not to schedule the last slice against a bonus. Progressive stages can be certified months ahead of the sales-gallery timeline; assume the build will be fast, not slow, and keep the cash ready.

Model the schedule as if every stage comes early. When you plan cash flow, compress the construction milestones, don't spread them. If the plan survives all the superstructure stages landing inside eighteen months, it will survive a slow build easily. If it only works on a leisurely timeline, it doesn't really work.

Budget the completion mortgage, not the construction ramp. The ~S$1,200 a month during construction is the easy part. The number that decides whether you can hold the home is the ~S$5,921 at completion — and it should be comfortable a couple of points above today's rate before you commit, because your loan balance and the interest rate both peak at exactly the same moment.

You can run your own unit, loan and timeline — including a faster build — through the new-condo purchase planner. The progressive payment scheme is genuinely useful plumbing. It only bites the buyer who plans around the timeline the brochure implies rather than the one the crane delivers.

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This is an illustrative composite, not a real client or transaction; "Wei and Hui" stand in for a common situation. All figures are computed by TRIBE from the stated assumptions: a S$1,800,000 purchase, 75% loan-to-value (S$1,350,000 loan, S$450,000 equity), Buyer's Stamp Duty of S$59,600 on the residential tiers in force since 15 February 2023, the ten-stage progressive payment schedule set by the Housing Developers Rules, reverse-waterfall disbursement (equity drawn before the loan), and an illustrative 2.3% floating rate (BUC packages are SORA-pegged and actual rates vary; the 3-month compounded SORA sat near 1.07% in mid-2026 per PropertyGuru). The 5%-must-be-cash booking rule, CPF usage and loan-to-value limits are set by MAS, HDB, CPF and IRAS and can change — verify current terms before committing. Not financial advice.

Silas Tan is a District Director at Huttons Asia and co-founder of TRIBE. This article is for informational purposes and does not constitute financial or investment advice. CEA Registration R000303I.