Disclaimer (Block 1): This article is for educational purposes only and is intended to assist CEA-registered property agents in understanding regulatory frameworks. It does not constitute financial, tax, or legal advice. LEVR's calculations are indicative only. Always verify rates and eligibility with your bank, HDB, CPF Board, or a licensed financial advisor before advising clients.
What Is the Interest Absorption Scheme?
When a buyer purchases a new launch private property under construction, payments are typically made progressively as construction milestones are reached — this is the Normal Progressive Payment Scheme (NPS). Under the NPS, the buyer’s loan is drawn down in tranches aligned with each construction milestone. During the construction period, the buyer services interest on the drawn-down portion of the loan.
The Interest Absorption Scheme (IAS) is an alternative offered by some developers. Under the IAS:
- The buyer pays the booking fee and a small initial tranche (5%–10% of the purchase price) at the time of sale, then defers all further payments until TOP.
- The developer absorbs the interest costs on the construction loan during the build period, instead of passing them to the buyer.
- At TOP, the buyer exercises the full loan drawdown and pays the remaining purchase consideration, including the final tranche.
The IAS is not universal — it is offered at the developer’s discretion and is typically only available on certain new launch projects. Not all projects offer the IAS, and where it is offered, the unit price under the IAS is generally higher than the unit price under the NPS to reflect the developer’s financing cost being embedded in the purchase price.
IAS vs Normal Progressive Payment: Key Differences
The choice between IAS and NPS affects the buyer’s cash flow and total acquisition cost during the construction period:
- Under NPS: The buyer starts servicing the loan interest as soon as the first drawdown occurs (typically after the foundation milestone). Monthly interest payments increase progressively as each construction tranche is drawn down. The buyer is essentially paying interest on a growing loan balance throughout the build period.
- Under IAS: The buyer makes only the initial payment (typically 5%–10% upfront) and then has no mortgage interest payments until TOP. The full loan is drawn only at TOP when the buyer takes possession. Monthly mortgage repayments start from TOP.
- Price premium for IAS: Developers offering IAS typically price IAS units at a premium over NPS units in the same development (the premium reflects the developer’s financing cost being embedded). The premium is not always transparent — agents should compare the absolute price of IAS and NPS units when both are offered.
When IAS Is Advantageous
The IAS may be the preferable choice for buyers who:
- Own an existing property with an outstanding mortgage: Buyers who already service one mortgage may struggle to carry progressive construction loan interest on a second property during the build period. IAS defers the additional monthly outlay until TOP, giving the buyer time to sell or refinance the existing property.
- Have strong liquidity preferences: Buyers who prefer to keep cash available during the construction period — for other investments, business capital, or contingency — may value the IAS deferral even if it costs more in total.
- Are purchasing near TOP: If the expected build period remaining is short (e.g., TOP expected in 12–18 months), the IAS price premium may be small and the cash flow benefit meaningful.
When NPS May Be Preferable
The NPS is generally more cost-effective when:
- The IAS price premium significantly exceeds the total progressive interest the buyer would pay under NPS. This is particularly relevant for longer build periods (3–5 years) where progressive interest compounds.
- The buyer has already sold their existing property and has CPF and cash available to service the loan during construction — in this case, there is no cashflow constraint and the lower NPS price is preferable.
- Interest rates are low, making NPS progressive interest payments modest relative to the IAS price premium.
Agent Advisory Responsibilities
When advising buyers on IAS vs NPS, agents should:
- Present the absolute unit prices for both options where both are available, so the buyer can assess the IAS premium in dollar terms.
- Estimate the total NPS progressive interest using the construction schedule, expected drawdown tranches, and a representative interest rate — so the buyer can compare NPS total cost vs IAS premium.
- Ask the buyer about their current property obligations and liquidity position. The IAS decision is primarily a cash flow management question, not just a price question.
- Direct the buyer to their mortgage broker or bank to model the specific loan drawdown schedule and interest cost under NPS before committing to IAS.
Frequently Asked Questions
Q: Can a buyer switch from IAS to NPS after signing the Sale and Purchase Agreement?
A: No. The payment scheme is specified in the Sale and Purchase Agreement and cannot be changed unilaterally by the buyer after signing. Buyers must decide on the payment scheme before exercising the OTP and ensure they understand the implications. If IAS is chosen and specified in the SPA, the buyer is bound by the IAS terms for the duration of the construction period.
Q: Does IAS affect the buyer's CPF usage?
A: IAS does not change the CPF rules for new launch purchases. CPF can be used for the initial payment and for the mortgage repayment from TOP. During the construction period under IAS, the buyer is not drawing on CPF for progressive interest payments (as there are none). CPF can be used to fund the remaining purchase price at TOP alongside the loan drawdown. The normal CPF housing withdrawal limits apply based on the purchase price and assessed value at the time of the loan drawdown.
Q: Is IAS the same as a deferred payment scheme?
A: They are structurally similar but distinct. The Deferred Payment Scheme (DPS) allowed buyers to purchase new launch units with a small initial payment and defer the majority of the purchase price until TOP. The DPS was abolished in 2007 by MAS as part of property cooling measures. The IAS is a narrower instrument — it is offered by some developers and involves the developer absorbing interest during the build period, but the buyer still makes progressive payments at each construction milestone. The IAS is not a full deferral of purchase price payments.
Disclaimer (Block 3): LEVR's calculator outputs are estimates based on inputs provided and current regulatory parameters as known at time of publication. They are not a guarantee of borrowing capacity, stamp duty liability, or CPF eligibility. Regulatory thresholds and rates may change. Always verify with IRAS, your bank, or a licensed financial advisor before making financial decisions.