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 Was the 99-to-1 Arrangement?
The 99-to-1 arrangement (also written "99:1") was a structure used by some property buyers in Singapore to attempt to avoid Additional Buyer's Stamp Duty (ABSD) on what would otherwise be a second residential property purchase.
The mechanics were as follows:
- First purchase: One buyer (typically a spouse who already owns a property) purchases 1% of the new property. At the point of this 1% purchase, they are acquiring a share of a property — not a second full property in the conventional sense — and the ABSD is calculated on the 1% purchase price only.
- Second purchase (99%): The other spouse (who does not own any property) subsequently purchases the remaining 99% interest. Because this buyer has no prior property, the 99% acquisition is treated — the argument went — as a first-property purchase with 0% ABSD for a Singapore Citizen.
- Intended outcome: The couple acquires a second property as a unit while paying ABSD only on the 1% share held by the property-owning spouse, rather than on the full purchase price.
This structure exploited the sequential timing of purchases to minimise ABSD by splitting the acquisition into two transactions.
The 2023 IRAS Crackdown
In May 2023, IRAS announced that it had investigated buyers who used the 99-to-1 arrangement and determined that the transactions constituted artificial or contrived arrangements designed to evade ABSD. IRAS invoked the anti-avoidance provisions under Section 33A of the Stamp Duties Act, which empowers the Commissioner of Stamp Duties to disregard arrangements that have no commercial purpose other than to reduce stamp duty.
The consequences for buyers who used this arrangement:
- Back ABSD: IRAS assessed the full ABSD that would have been payable had the second property been purchased normally — typically 20% of the purchase price for a Singapore Citizen's second residential property.
- 30% surcharge: An additional surcharge of 30% of the back ABSD was imposed as a penalty for the artificial arrangement.
- Interest: Interest was charged on the unpaid ABSD from the date it would have been due.
On a $2,000,000 property, the back ABSD at 20% would be $400,000. With the 30% surcharge, the total additional cost is $520,000 — far exceeding any stamp duty that would have been saved.
Why IRAS Treated This as Tax Avoidance
The 99-to-1 arrangement failed on the substance-over-form test applied by IRAS for two main reasons:
- No commercial purpose for the split. The sequential 1% / 99% purchase structure had no legitimate commercial rationale — it existed solely to manipulate the timing of stamp duty assessment. IRAS found that the two transactions were pre-arranged and structured as a single scheme to purchase a property jointly.
- The economic reality was a joint purchase. Both parties intended from the outset to acquire the property together. The legal structure artificially separated what was substantively a simultaneous co-purchase.
IRAS also published a reminder that buyers (and their agents and lawyers) have a legal obligation to report ABSD accurately. Facilitating an artificial arrangement to reduce stamp duty is a serious regulatory violation.
99-to-1 vs Legitimate Decoupling
Legitimate decoupling — where a co-owner buys out the other co-owner's share in an existing property to remove one person from ownership — is a legal ABSD planning strategy. The key differences:
| Feature | Legitimate Decoupling | 99-to-1 Arrangement |
|---|---|---|
| Timing | After the property is already owned; one party buys out the other | Sequential purchase of 1% then 99% as a pre-planned scheme |
| BSD on transfer | Yes — BSD is payable on market value of the share transferred (cannot be avoided) | 1% BSD payable on 1% share — structure was designed to minimise BSD/ABSD |
| Commercial purpose | Genuine change in ownership to allow the decoupled party to purchase another property | No commercial purpose other than ABSD avoidance |
| IRAS stance | Accepted (subject to correct BSD payment on market value) | Anti-avoidance provisions applied; back ABSD + 30% surcharge |
| Legal risk | Low if properly structured and BSD paid | High — IRAS has actively investigated and penalised these cases |
CEA Agent Obligations: Do Not Facilitate
CEA-registered property agents have professional and legal obligations in this area:
- Do not recommend, suggest, or facilitate 99-to-1 or similar arrangements. If a client or developer representative asks about such structures, agents must clearly state that IRAS has identified this as tax avoidance and penalised buyers.
- Refer to a qualified tax adviser. Buyers who want to explore legitimate ABSD planning options (decoupling, staggered purchases, FTA remissions) should be referred to an independent tax professional — not advised by the agent.
- Document your advice. If a client asks about 99-to-1 and you advise against it, document that advice in writing. This protects the agent if the client proceeds independently and later faces IRAS action.
- CEA disciplinary risk. An agent found to have advised or facilitated a scheme designed to evade stamp duty faces disciplinary action from CEA in addition to any IRAS penalties. Sanctions can include suspension or revocation of the estate agency licence.
Other Artificial Arrangements IRAS Has Flagged
Beyond 99-to-1, IRAS has previously flagged other schemes designed to reduce BSD or ABSD:
- Understating purchase price: Declaring a lower transacted price to reduce BSD, with side payments made outside the official contract. IRAS computes duty on the higher of contract price and market value.
- Related-party transactions at undervalue: Transferring property between related parties (family members, related companies) at below-market prices to reduce BSD. IRAS assesses duty on market value regardless of transacted price.
- Circular transactions: Selling and repurchasing properties in sequence to reset ownership counts, intended to avoid the third-property ABSD tier.
Key Takeaway for Agents
The 99-to-1 arrangement is a resolved issue — IRAS has investigated, penalised affected buyers, and confirmed it will continue to monitor for similar schemes. Any arrangement structured primarily to avoid stamp duty, with no genuine commercial purpose, risks anti-avoidance provisions being applied.
Agents who encounter clients asking about "ways to save ABSD" should:
- Explain the legitimate options (decoupling, timing, FTA remissions if applicable).
- Make clear that the 99-to-1 arrangement has been penalised and is not a viable strategy.
- Refer the client to a tax adviser for any ABSD planning beyond these basics.
- Never suggest or facilitate any arrangement the client describes as a way to "get around" ABSD.
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.