Introduction
Decoupling property has long been viewed as the go-to strategy for investment-minded homeowners looking to acquire a second property without triggering hefty stamp duties. Traditionally, the risks were thought to revolve mainly around financing and property selection.
However, the landscape in 2025 has shifted. With rising cases of malpractice and increasingly aggressive misuse of decoupling to underpay or avoid taxes, the risk of decoupling is now under far greater scrutiny. Recent high-profile cases – such as a dating couple penalised for abusing the 99-1 ownership arrangement purely as a tax avoidance tool – highlight how compliance has become the foremost concern.
From our research, the risks tied to decoupling are no longer one-dimensional. Instead, they are best understood as four interlinked risk categories:
- Compliance risk – the danger of regulatory breaches and penalties.
- Property ownership risk – loss of property ownership due to shareholding splits.
- Financing risk – challenges in loan eligibility, servicing, and cost of funds.
- Investment selection risk – choosing the wrong property after decoupling, undermining the whole exercise.
As we explore these risks in depth, this article aims to provide clarity for property owners who are considering decoupling in 2025.
Goal of This Article
The goal of this article is to provide an updated and practical review of the risk of decoupling in 2025. Beyond simply listing out the pitfalls, our objective is to break down each risk factor – compliance, ownership, financing, and investment selection – and explain how they can impact property owners differently depending on their circumstances.
Equally important, we will highlight the prerequisite steps and safeguards that homeowners can take to mitigate these risks before committing to a decoupling strategy. By the end, readers should have a clearer understanding not only of the potential downsides but also of how to navigate them with foresight and discipline.
Quick Introduction – Decoupling Expertise
A quick introduction before proceeding.
We are Decoupling Expertise, we are a boutique real estate investment consultancy that specialises in helping Singaporean property owners procure investment properties. Our services focus predominantly on providing analyst grade research for investment minded home owners.
Given decoupling forms a core component in an investor’s toolkit. We seek to be the leading content publisher providing the latest and most detailed coverage of the topic. Providing our readers and clients with the greatest clarity and the clearest next steps moving forward.
Risk Factor #1 – Compliance Risk
A key point to recognise is this: it has never been our country’s regulatory priority to help investors build wealth by owning multiple properties. Decoupling is tolerated as a legal mechanism, but the regulatory stance on its use is always in flux, and enforcement actions are becoming sharper.
Recent court rulings have reinforced that the risk of decoupling now extends far beyond financing or affordability – compliance has become the primary concern. Two notable cases highlight this shift:
- Dating couple 99-1 case (2 Aug 2025): A couple arranged a 99-1 split with the intent of decoupling later to buy a second property. After they separated, the 1% owner claimed entitlement to more than his legal share, arguing he had contributed financially. The High Court found that while there is nothing inherently wrong with a 99-1 ownership structure, the arrangement crossed into tax avoidance because it lacked genuine commercial substance. Judge Lee Seiu Kin noted: “while there was nothing inherently wrong with buyers holding their stakes in the 99-to-1 proportion, the transaction could turn illegal if the decoupling was not a genuine outright transfer but merely a scheme to avoid paying tax.”
- ABSD loophole cases (23 May 2024): Buyers purchased new launch properties and then sold a 1% share to an existing property owner to avoid paying the full Additional Buyer’s Stamp Duty (ABSD). Again, the courts ruled this was a form of tax avoidance, as the structuring served no purpose other than minimising tax obligations.
Risky Red Flags to Watch For
From these cases, several compliance red flags have emerged:
- Using a 99-1 share split but having a separate “under-the-table” agreement to recognise a different ownership ratio.
- Splitting 99-1 and then selling off the 1% share quickly for the sole purpose of acquiring another property.
- Any arrangement where the sole intent is ABSD avoidance without genuine financial, estate, or ownership rationale.
Mitigation Measures: Staying Above Board
To reduce compliance risks, investors must ensure that decoupling arrangements have legitimate financial or estate planning intent beyond tax savings. Examples include:
- Genuine contribution and gifting: As noted by Associate Professor Stephen Phua (NUS), it is legitimate if a spouse holds 1% with the genuine intent of helping pay the mortgage, and later transfers this share as a gift – with proper stamp duty paid.
- Commercial substance: Ensure the transaction can stand up to scrutiny as a bona fide transfer with economic or estate planning purpose.
- Legal consultation: Each situation is evaluated case by case. Seeking professional legal and tax advice before entering into any decoupling plan is critical.
The compliance landscape makes it clear: decoupling solely for tax avoidance is no longer tolerated. To stay on the right side of the law, property owners must anchor their decisions in genuine financial or estate planning objectives, not just ABSD minimisation.
Table: Key Cases, Risks, and Expert Learnings on Decoupling / 99-1 Structures
| Case Name | Case Summary | Learning Pertaining to Risk Involved | Potential Best Practice / Risk Mitigation (Expert Quoted) |
| High Court Case (2025) | Couple used a 99-1 split (one spouse 99%, other 1%) to avoid ABSD. IRAS challenged it as a sham. The High Court struck it down, ordering repayment of stamp duties with penalties. | – Legal / Regulatory risk: Courts will strike down arrangements structured solely for tax avoidance, applying “substance over form.” – Ownership risk: Selling spouse loses legal rights to property despite continued financial contributions. | – Minority shareholding can be genuine: “Some may just hold 1 per cent because they genuinely only wanted to help pay down the mortgage.” – Assoc. Prof. Stephen Phua, NUS Law. – Genuine gifts & proper stamp duty: If a 1% share is later transferred as a genuine gift, with stamp duty paid properly, “it would be difficult to accuse them of wrongdoing.” – Assoc. Prof. Phua. – Proper declaration at point of decoupling: Existing joint owners who decouple are not under-declaring “if the transfer was genuine and stamp duty was properly paid on 50 per cent of the market value.” – Assoc. Prof. Phua. |
| IRAS 99-1 Investigation (2023–2024) | IRAS probed contrived “100-1” deals: one owner buys 100%, then sells 1% to another who already owns property, drastically reducing ABSD. IRAS deemed these artificial and without commercial substance. Investigations go back to 2011; whistleblowers rewarded up to $100k. | – Tax evasion risk: Transactions with no bona fide reason are classified as avoidance. – Audit risk: IRAS can investigate retrospectively, even if the property is sold. – Reputation & compliance risk: Exposure to whistleblowing and public penalties. – Relationship risk: Same as above, selling off legal share means no rights if disputes arise later. | – Show bona fide reason: “The only way to escape the anti-avoidance rule is to convince IRAS that one of the purposes… was not tax avoidance and that there were rational reasons for doing so.” – Assoc. Prof. Stephen Phua, NUS Law. – Reflect true contributions: “If two siblings decide to buy a property together… they may decide to make this clear in the shareholding.” – Mabel Tan, Senior Partner, Joseph Tan Jude Benny. – Legitimate planning purposes: “In some genuine cases, owners may decide to jointly hold the property in different proportions, say 99-to-1, for the purpose of estate planning, risk allocation or with the intention to purchase another property.” – Norman Ho, Senior Partner, Rajah & Tan. – Maintain proper records: “Buyers should not be surprised that they can be audited… they must keep [ABSD declaration] documents for at least five years.” – Assoc. Prof. Phua. – Avoid contrived two-step deals: IRAS highlighted that splitting one purchase into “two or more steps to reduce the tax payable” is deemed a tax avoidance arrangement. |
Risk Factor #2 – Property Ownership Risk
Beyond compliance, another risk that has come into sharper focus in 2025 is the ownership implications of decoupling. Once a decoupling transaction is executed, it is treated as a full and final legal transfer of ownership rights to the co-owner. Any informal agreements or side documents claiming a different ownership split carry no weight in court.
The August 2025 case provides a clear precedent. In that dispute, the minority shareholder attempted to argue that there was a private, underlying agreement to co-own the property equally despite having legally transferred away his share. The court not only dismissed the claim but also highlighted that such arguments could further expose the parties to charges of tax avoidance or underpayment of Buyer’s Stamp Duty.
Risk Implications
- Unmarried couples: This risk is most acute when the parties are not legally married. If the relationship ends, the individual who no longer holds ownership after decoupling has no legal recourse to reclaim the property. The entire asset belongs to the party holding 100% post-transfer.
- Married couples: The situation differs slightly. Under the Women’s Charter, decoupled properties can still be classified as matrimonial assets during divorce proceedings, which means they remain subject to division. However, the nuances of matrimonial law add further layers of complexity (refer to related analysis: What Happens if You Divorce After Decoupling Property).
In short, the risk of decoupling lies in the fact that once ownership is legally transferred, it is binding – regardless of personal relationships, informal agreements, or verbal promises.
Mitigation Measures
- Avoid co-decoupling for unmarried couples: Based on experience with clients, entering into a decoupling arrangement as an unmarried couple often begins with optimism but can lead to serious disputes if the relationship deteriorates. The safest course is to avoid such arrangements altogether.
- Seek professional structuring advice: Where decoupling is being considered, ensure the ownership transfer is backed by clear legal advice so that all parties understand the binding consequences.
Ownership risk is often underestimated, but in practice, it can be the most emotionally and financially devastating pitfall – particularly for couples who are not legally bound by marriage.
Risk Factor #3 – Financing Risk
With global interest rates expected to ease in 2025, the financing risk of decoupling has shifted in nature. Unlike previous years where rising mortgage rates were the dominant concern, the primary challenge today comes from personal income stability rather than macro interest rate trends.
After decoupling, each spouse takes on an individual mortgage under their own name. While this may appear manageable on paper, the combined effect is that both loans are now larger in quantum than the original shared loan. This makes the arrangement more vulnerable to any disruption in income.
Risk Implications
- If one spouse loses a job, faces reduced income, or takes time off work due to family obligations or health issues, the single-name mortgage tied to them can quickly become unsustainable.
- Because the financing responsibility is legally separated, there is no automatic safety net – one party may face repayment pressure even if the other remains financially stable.
- Over-leveraging through decoupling can also limit future borrowing capacity, reducing flexibility in responding to new investment opportunities.
Mitigation Measures
To minimise these risks, homeowners should:
- Stress-test mortgage scenarios: Run simulations on monthly repayment obligations under different loan sizes and interest rate assumptions. This provides clarity on cash flow requirements under less-than-ideal conditions.
- Build a cash buffer: Maintain a reserve equivalent to at least six months of mortgage payments. This acts as a safeguard if one spouse experiences a sudden income disruption.
- Adopt conservative loan planning: Avoid maximising loan eligibility to the theoretical limit; instead, structure financing with a margin of safety that accounts for real-world uncertainties.
In essence, the financing risk of decoupling in 2025 is less about fluctuating rates and more about household income resilience. Preparing for shocks through stress testing and cash buffers can help property owners avoid financial strain if circumstances change unexpectedly.
As a sidenote, check out the following for a decoupling calculator to easily estimate the cost of decoupling.
Risk Factor #4 – Investment Property Selection Risk
Decoupling is both art and science. The science lies in executing the process in a compliant, legally sound manner. The art lies in what happens next – selecting the right second property. Given the substantial cost of decoupling (legal fees, stamp duties, refinancing costs), it is mission critical that the chosen investment property has the capital growth potential to deliver profits that surpass these costs within a reasonable timeframe.
Risk Implications
A poorly selected second property can turn the entire decoupling exercise into a liability rather than an asset. We have encountered cases where couples decoupled at significant expense only to purchase a small boutique freehold one-bedder that stagnated in value for years. Instead of unlocking new wealth, the property tied up capital, reduced flexibility, and failed to justify the upfront cost of decoupling.
Mitigation Measures
- Work with data-driven advisors: Beyond competent legal counsel to handle the decoupling, engage real estate professionals who can provide evidence-based investment selection rather than relying on sales pitches or market hype.
- Prioritise fundamentals over sentiment: Look for properties with strong demand drivers – proximity to MRT stations, reputable schools, and upcoming transformation zones – rather than being swayed by marketing gloss.
- Use analytical tools: Modern property analytics can help assess rental yields, price gaps between new launches and resale, and long-term capital growth trends. This ensures that the second property is positioned to generate meaningful returns.
Ultimately, the risk of decoupling does not end with compliance or financing. If the second property fails to appreciate, the entire strategy collapses under the weight of its costs. Success lies not just in how you decouple, but in what you choose to buy after the decoupling is done.
Seek clarify with proper legal consultation
Legal Disclaimer : Please do not take this as legal advice, refer to a qualified legal counsel specialising in decoupling for a formal review of your plans based on your specific circumstances.
For more clarification, with regards to this drop us a text to clarify your doubt and we will also refer you to our partnering lawyer for further clarification
Conclusion
In 2025, the risk of decoupling is no longer confined to simple financing or administrative hurdles. The strategy now sits under sharper regulatory and practical scrutiny, with pitfalls across four critical dimensions – compliance, ownership, financing, and investment selection. Each comes with its own set of challenges, and ignoring any one of them can turn a once-promising plan into a costly misstep.
Yet, decoupling remains a powerful tool when executed thoughtfully. The key lies in intent and preparation: ensuring compliance with tax rules, recognising the binding nature of ownership transfers, planning conservatively for financing obligations, and selecting a second property backed by strong fundamentals.
Ultimately, decoupling should not be seen as a shortcut to avoid ABSD but as a strategic step in a broader wealth-building journey. With proper legal guidance, financial planning, and data-driven property selection, homeowners can avoid the common pitfalls and harness decoupling as a legitimate, value-creating strategy.
FAQ
Is decoupling property legal in Singapore?
Yes, decoupling is a legal mechanism. However, the risk of decoupling arises when it is used purely to avoid taxes such as ABSD. Courts have ruled that arrangements lacking commercial substance – for example, 99-1 splits engineered only for tax minimisation – can be deemed tax avoidance.
What is the biggest risk of decoupling in 2025?
The primary risk today is compliance. Regulatory scrutiny has tightened, and high-profile cases have shown that tax authorities and courts will strike down transactions structured solely for tax avoidance. Other risks include ownership disputes, financing challenges, and poor investment property selection.
Can unmarried couples safely use decoupling?
Unmarried couples face higher ownership risks. Once one party transfers their share, they lose all legal rights to the property. If the relationship ends, there is no legal recourse. Married couples, on the other hand, are still protected under matrimonial laws, though property division remains subject to the Women’s Charter.
How much does decoupling typically cost?
Costs vary depending on property value but usually include legal fees, stamp duties, and refinancing charges. These can range from tens of thousands to over a hundred thousand dollars. This makes it critical that the second property purchased after decoupling generates enough capital appreciation to offset these upfront costs.
How can I mitigate the risks of decoupling?
The best way to manage the risk of decoupling is to ensure your intent goes beyond tax savings. Avoid informal or “under-the-table” agreements that could be flagged as avoidance schemes. Conduct mortgage stress tests and maintain a sufficient cash buffer to prepare for income disruptions. Finally, work with advisors who apply data and analysis to property selection, and always seek proper legal and tax counsel before executing the strategy.
