Decoupling 99-1 – Should You Still Do It in 2026?

When it comes to Decoupling 99-1, most readers arrive here with one of three situations in mind:

1. You are in the midst of purchasing a new property (private condo or EC) and are wondering if you should structure ownership as a 99-1% tenancy-in-common, with plans to execute a decoupling 99-1 down the road.
   
2. You already own a private property under a 50-50 shareholding structure and are considering whether to restructure into a 99-1 split for future decoupling.
   
3. You currently hold a property in a 99-1 share split and are concerned whether you could face issues if you attempt a decoupling 99-1 in today’s regulatory climate.
   

From my experience answering countless questions from readers and clients, the vast majority fall into camp 1 (those planning ahead) and camp 3 (those already holding a 99-1 split). Owners in camp 2 form a much smaller group.

With this in mind, we’ll focus this article primarily on the issues and considerations most relevant to new buyers deciding whether to use 99-1 today, and current owners evaluating the risks of decoupling 99-1 in 2025.

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What is Decoupling 99-1?

At its core, Decoupling 99-1 is a variation of the standard decoupling process, designed with cost efficiency in mind. It can be broken down into two key steps:

Step 1 – Setting up a 99-1 shareholding structure

Instead of the conventional 50-50 joint tenancy, ownership is first structured as a tenancy-in-common, where one party holds 99% of the property and the other holds just 1%.

Step 2 – Executing the decoupling

Later on, the minority 1% owner sells their share to the 99% majority owner through an internal sale-and-purchase transaction. This transaction consolidates ownership in the hands of one party and “frees up” the other party’s name.

Once the minority owner’s name is no longer tied to the first property, the former 1% owner is considered property-free and can purchase a second property without incurring Additional Buyer’s Stamp Duty (ABSD).

In short, the 99-1 decoupling strategy is structured to reduce upfront costs while still achieving the same end goal as conventional decoupling – enabling one spouse to buy a second property with minimal ABSD impact.

The Motivation Behind Decoupling 99-1?

Now that we’ve explained how Decoupling 99-1 works, it’s important to understand the motivations driving property owners to adopt this strategy. In many cases, the objective revolves around minimising stamp duties when planning for a second property purchase.

1. Minimise ABSD

The main driver is Additional Buyer’s Stamp Duty (ABSD). By freeing up one spouse’s name through decoupling, that party can purchase a second property without triggering ABSD, which can run as high as 20% to 30% of the property’s value.

2. Minimise Buyer’s Stamp Duty (BSD)

Here is where Decoupling 99-1 differs significantly from standard decoupling. With a conventional 50-50 split, BSD is calculated on 50% of the property’s value during the transfer. In contrast, under a 99-1 structure, BSD is only levied on the 1% minority share, resulting in a drastic reduction in costs.

3. Minimise Seller’s Stamp Duty (SSD)

The same logic applies to Seller’s Stamp Duty (SSD). If a property is sold within the first four years, SSD rates (ranging from 16% in year one to 4% in year four) apply. In a 99-1 decoupling scenario, SSD is charged only on the 1% value of the property, making it far less costly for owners who wish to decouple earlier.

In short, Decoupling 99-1 is attractive because it provides the dual benefit of unlocking ABSD savings while also reducing BSD and SSD costs compared to standard decoupling.

As a sidenote, a common question that you would have would be whether the seller stamp duty’s start date for the property gets reset after decoupling 99-1. We have addressed this in detail in the article “Will Seller Stamp Duty Reset After Decoupling or Decoupling 99-1 ?“

Stamp Duty Cost Comparison Decoupling 99-1 vs Decoupling Property

Is It Even Legal to Decouple 99-1?

With recent court cases in August 2025 and an IRAS investigation in April 2024, one of the most pressing questions is whether Decoupling 99-1 is even legal.

The short answer is: yes, but with important caveats.

What’s Legal

• Decoupling a property is not illegal.
  
• Adopting a 99-1 tenancy-in-common structure is also not illegal in itself.
  

What’s Not Legal

Where problems arise is when the arrangement is purely a tax avoidance scheme without any genuine commercial substance. Examples include:

• Structuring a 99-1 split solely to minimise ABSD, BSD, or SSD, without any other commercial justification. (Source: Straits Time, August 2025 Decoupling Case)
  
• Having a 99-1 split on paper, but in reality both parties continue to treat the property as though they each own 50%. This creates a mismatch between legal ownership and actual beneficial interest, which can be deemed a sham. (Source: Straits Time, Losing Property Rights)
  

In other words, Decoupling 99-1 is only defensible if the ownership structure reflects a legitimate commercial intent. Without that, owners risk running afoul of IRAS scrutiny and potential penalties for tax avoidance.

Should You Implement a 99-1 Shareholding Structure Now and Decouple Down the Road?

Now that we’ve established it is not illegal to adopt a 99-1 ownership split or to decouple a property, the more practical question is whether you should do it in 2025.

Our recommendation is no – it is generally better to avoid a 99-1 shareholding structure.

Compliance Risks

1. Regulatory red flags: An extreme 99-1 split immediately stands out during any IRAS review or audit.
   
2. Underpayment penalties: If your only intent is to reduce Buyer’s Stamp Duty through decoupling, you could be penalised for underpayment.
   
3. Tax avoidance risk: Without a strong commercial rationale, IRAS may classify your arrangement as tax avoidance.
   

Financing Challenge Due to CPF Refund

Another common issue lies in how CPF contributions are treated. A real-life case illustrates this challenge:

• John and Sally adopted a 99-1 structure, with John holding 1% and Sally 99%.
  
• Their property was valued at $2 million. John used $300,000 of CPF funds, far exceeding his 1% share value.
  
• When they later tried to decouple, John’s CPF refund of $300,000 had to be returned entirely in cash. Loans are not permitted for this refund.
  

This created a serious cashflow roadblock. In contrast, had they used a 50-50, 60-40, or even 70-30 split, Sally could have financed the share transfer using up to 75% bank loan, supplemented by cash or CPF. This problem is often referred to as negative cashflow due to CPF refund – and it is a key risk unique to extreme shareholding splits like 99-1.

Lack of Future-Proofing

In the 2024 “100-1” case, IRAS highlighted that there is no time bar on how far back they can investigate. This means even if your decoupling seems fine today, you could be questioned years later if it appears to lack commercial substance.

Unless you have a sound, defensible reason for adopting such an extreme split, Decoupling 99-1 exposes you to long-term risks that could surface well after the transaction.

Decoupling 99-1 the Right Way Moving Forward

The compliance landscape has shifted significantly in recent years. What used to be a straightforward ABSD-avoidance strategy now requires far greater scrutiny. The old mindset of adopting a 99-1 split purely to minimise stamp duties is no longer sustainable.

Instead, the approach moving forward should be compliance-first, built on three core principles:

1. Commercial intent as the foundation – ABSD minimisation should only be a by-product, not the primary driver. (Source : SMU School of Law Research)
   
2. Avoid cookie-cutter strategies – If every investor implements the same 99-1 structure, it immediately raises red flags. The share split must reflect your unique financial circumstances.
   
3. Compliance and efficiency go hand-in-hand – A compliant strategy is now just as important as a cost-efficient one.
   

With this in mind, here are the key components of a compliance-first decoupling strategy.

1. Identify Your Commercial Intent

Many owners overlook the fact that there are often genuine commercial reasons to adopt a disproportionate share split or to decouple. Recognising these reasons and documenting them is critical.

Examples of commercial intent behind disproportionate shareholding:

• Reflecting financial contributions: If one spouse contributes significantly more than the other, a 70-30 or 80-20 split properly reflects this imbalance.
  
• CPF financing constraints: Entrepreneurs or self-employed individuals often have limited CPF savings. Allocating a larger share to the spouse with more CPF allows better financing flexibility.
  

Examples of commercial intent behind decoupling itself:

• Liquidity for other investments: Selling one’s share to a spouse can free up funds for business or portfolio diversification. (Source: Business Times, Commercial Intent Behind Decoupling)
  
• Estate planning: Transferring shares can be part of succession planning, ensuring smooth asset distribution.
  

2. The Importance of Time Gap

The timeline between events matters. Obvious avoidance schemes typically follow a predictable pattern:

• Structuring a 99-1 shareholding.
  
• Shortly after, decoupling and immediately purchasing a second property.
  

This compressed timeline makes it difficult to justify any purpose other than tax avoidance.

In contrast, if there are several years between the initial structuring, the decoupling, and the eventual second purchase, it becomes easier to demonstrate genuine commercial reasons – such as changes in income, investment priorities, or family needs.

3. A Less Aggressive Share Split Works Better

Rather than defaulting to a 99-1 split, consider alternatives like 70-30 or 80-20. These ratios often align more naturally with actual financial contributions and CPF usage, making them both defensible and practical.

For example:

• If one spouse contributes the bulk of CPF funds, reflect that in their shareholding.
  
• If contributions are closer to equal, adopt a more balanced structure to avoid red flags.
  

Not only does this reduce compliance risk, it also helps prevent negative cashflow issues during CPF refunds – a common pitfall in extreme 99-1 cases.

Should You Still Decouple if You Are Currently on a 99-1 Share Split?

For many readers, the question is not whether to adopt a 99-1 shareholding structure, but what to do if you already have one in place. The reality is that a large number of owners entered into this structure before the regulatory environment became more stringent.

If you are in this position, the decision to proceed with decoupling should not be taken lightly. Instead, refer back to the compliance-first framework discussed earlier:

• Assess your commercial intent: Beyond ABSD minimisation, do you have a clear and defensible reason for decoupling? For example, unlocking funds for a business venture, restructuring ownership for estate planning, or properly reflecting differences in financial contributions.
  
• Seek professional validation: Obtain a second opinion from an experienced tax lawyer who has handled decoupling cases. Their input can help confirm whether your plan has genuine commercial substance.
  
• Document your case carefully: Keep a clear paper trail – from financial contributions to ownership agreements – that supports your stated commercial intent. This documentation can be critical in the event of an IRAS review.
  

If none of these conditions apply, it may be wiser to explore alternative strategies such as a Sell One Buy Two approach. This route avoids the compliance risks associated with a 99-1 decoupling and can still achieve the objective of owning two private properties.

The Services To Help You Gain Clarity on Your Decoupling 99-1 Plan

Legal Consultation

• Engage a conveyancing lawyer with proven experience in handling decoupling cases.
• Obtain a second opinion on whether your decoupling plan has genuine commercial substance.
• Ensure all ownership transfers, stamp duty filings, and fund flows are properly documented to withstand regulatory scrutiny.

Tax Advisory

• Consult tax specialists familiar with IRAS rulings who can identify potential compliance risks.
• Clarify the full stamp duty implications – including BSD, ABSD, and SSD – before proceeding.
• Understand how IRAS interprets intent and ensure your case is above board

Legal Disclaimer

This article is for informational purposes only and should not be taken as legal advice. For official advice, always seek consultation from a qualified lawyer with direct experience in decoupling property cases.

If you would like a referral to a trusted decoupling lawyer, drop us a text and we will save you the time of researching one yourself.

Should Unmarried Couples Consider Decoupling 99-1?

Another fringe case involves unmarried couples in long-term relationships who may be considering buying an investment property together under a 99-1 structure, with the eventual plan to decouple and purchase a second property.

At first glance, this might appear to replicate the strategy used by married couples. However, the risks are far greater for unmarried partners.

• Unequal protection for the minority owner: If the relationship breaks down, the 1% shareholder has no legal recourse to claim an equal share of the property. The court will only recognise the legal ownership reflected on the title – 99% and 1% – not any informal arrangement between the couple.
  
• Regulatory risks: In the recent August 2025 High Court case, the court not only upheld the strict 99-1 ownership split but also signalled that proceeding with such arrangements could attract penalties for underpayment of Buyer’s Stamp Duty.
  

Given these risks, it is not advisable for unmarried couples to adopt a 99-1 structure with the intention of decoupling.

For married couples, the situation is significantly different. The Women’s Charter ensures that marital assets are divided equitably in the event of divorce, regardless of whether the property is held in a 99-1, 70-30, or 50-50 split. This legal framework provides protection that unmarried couples simply do not have.

For a deeper dive into this scenario, you may wish to refer to our separate guide: “What Happens If You Divorce After Decoupling Property?”

Who Should Be the One Holding the Minority Share?

After addressing the broader compliance and legal considerations, it is worth turning to one of the finer but frequently asked questions: who should hold the minority share in a 99-1 structure?

The answer depends largely on each couple’s financial circumstances and long-term objectives. Two key factors typically guide the decision:

1. Earning Power
   
   The spouse with the higher earning capacity is usually better positioned to take on a larger budget for the second property. In this scenario, it often makes sense for the higher-income earner to be the one selling their share and becoming the “freed-up” buyer.
   
   
2. Financial Contributions
   
   The shareholding should also reflect how much each spouse contributes to the property. If one spouse contributes significantly less – whether in cash or CPF – it is more appropriate for that spouse to hold the smaller share proportion.
   

Structuring ownership this way not only aligns with practical financing realities but also strengthens the legitimacy of the arrangement by showing that the share split reflects genuine commercial circumstances, rather than being purely tax-driven.

For a deeper discussion of different ownership splits, refer to our dedicated article: “What Share Split Should You Consider for Decoupling?”

What Will Happen to Your Loan When Decoupling 99-1?

One of the most common areas of confusion around Decoupling 99-1 is how it affects the existing home loan. Many owners assume that if the share transfer is small – such as the 1% sale – their loan arrangements might remain untouched. Unfortunately, this is not the case.

When decoupling, the loan will almost always need to be restructured, and the process involves two steps:

1. Redeeming the existing loan – The current mortgage is first fully redeemed.
   
2. Issuing a new loan – A fresh loan is then granted to the party who retains ownership of the decoupled property.
   

For couples already on a 99-1 split, it is common that the home loan may be taken under just one spouse’s name. This often leads to the question: “If the minority 1% share is bought out entirely with cash or CPF, do we still need to restructure the loan?”

The answer is yes. Regardless of whose name the existing loan is under, any material change in the property’s ownership – which serves as the collateral – will automatically trigger a loan redemption and restructuring. This means owners must also prepare for the possibility of early redemption penalties, depending on the terms of their current mortgage.

For a deeper breakdown of the loan process, see our dedicated guide on Loan Restructuring When Decoupling 99-1.

Playing it safe with second opinions

If you are serious about decoupling, it helps to seek some second opinion confirming your current plans.

Drop us a text if you like to re-affirm the legitimacy of your plan

More Relevant Read Regarding Decoupling

• Is it worth decoupling to buy a second property in Singapore ?
• Ways To Minimise ABSD Legally In Singapore 
• IRAS 99 1 – Latest News Summary and Learnings for Property Owners
• How Can I Ensure Decoupling Property Transaction is Genuine
  

Frequently Asked Questions (FAQ) on Decoupling 99-1