Singapore’s tax regime has long been anchored on competitiveness, clarity and administrative efficiency. Alongside its pro-business stance, Singapore has steadily reinforced its safeguards against abusive tax practices. The General Anti-Avoidance Rule (GAAR) is set out in Section 33 of the Income Tax Act 1947 (ITA). Its statutory purpose is to safeguard the integrity of the tax system by drawing a clear distinction between legitimate tax planning and impermissible tax avoidance. 

 

Legislative Framework and Purpose

Under Section 33 of the ITA (Section 33), the Comptroller of Income Tax (CIT) is empowered to disregard or vary certain transactions and dispositions that have the purpose or effect of reducing or avoiding tax liability, deferring the incidence of tax or altering the character of income in a manner that results in tax savings.

While taxpayers may structure their affairs in a tax-efficient manner, Section 33 operates as a statutory backstop against abusive arrangements that lack genuine commercial substance and are designed primarily to obtain tax advantages. The GAAR is not intended to penalise efficient structuring supported by commercial rationale. Rather, it is intended to prevent the erosion of the tax base through artificial arrangements.

Accordingly, Section 33 reinforces the principle that while legitimate tax optimisation remains permissible, the tax system will not accommodate tax avoidance arrangements. 

 

What Constitutes Impermissible Tax Avoidance  

Inland Revenue Authority of Singapore (IRAS) does not rely on a single test when assessing whether an arrangement constitutes impermissible tax avoidance. Instead, it considers a combination of factors, including the following:

Economic substance

  • Whether the structure is supported by sufficient assets, personnel and operational activities, and whether there is actual risk-taking and decision-making in the conduct of real functions and activities.

Alignment with economic reality 

  • Whether the profits are aligned with value creation and whether income flows to the party that actually performs the services. 

Commercial purpose versus tax purpose

  • Whether the arrangement is supported by a bona fide commercial objective

Sequence of events and the way the arrangement is carried out 

  • Whether the steps involved in the arrangement are unnecessarily complex, circular, and whether various elements have been imposed solely to achieve tax outcomes. 

Relationships between the contracting parties

  • Whether the transactions are undertaken between related parties and the extent to which such relationships influence the arrangement.  

Financial consequences 

  • Whether the arrangement, without commercial justification, significantly reduces taxable income, converts income into lower-taxed forms or shifts income to lower-tax entities.

 

Common Scenarios Where Section 33 May Apply

The following are common examples of tax avoidance arrangements that may be regarded as having the purpose or effect of tax avoidance within the meaning of Section 33(1) of the ITA.

  • Circular flows or round-tripping of funds.
  • The use of conduit entities to obtain tax treaty benefits such as the avoidance of withholding tax. 
  • The assignment of debt to an offshore jurisdiction for the main purpose of obtaining tax advantage. 
  • The establishment of multiple entities solely to obtain tax advantage.
  • Changes in business form for the sole purpose of obtaining tax advantage. 
  • The attribution of income in a manner that is not aligned with economic reality.

 

Section 33A Surcharge

Section 33A introduces a deterrent financial penalty where Section 33 applies. 

A surcharge of 50% of the additional tax payable is imposed if the CIT makes an adjustment to counteract the tax advantage, resulting in additional tax being assessed. The surcharge must be paid within one month after the date of issuance of the Section 33A surcharge notice, notwithstanding any objection to the Section 33 adjustment.  

The CIT may, at his discretion, remit the surcharge wholly or in part for good cause. However, remission will generally not be considered if the adjustment arises from an audit or review initiated by IRAS.

A partial remission may be considered where taxpayers make a timely voluntary disclosure of their tax avoidance arrangements, subject to full cooperation and a consistently good compliance record with IRAS. 

 

Cases Involving Personal Services Income and Corporate Structuring  

A recurring area of Section 33 scrutiny in Singapore involves professionals, particularly those in the medical sector, who incorporate companies to receive income for personal services rendered. These arrangements often involve the diversion and/or fragmentation of income across multiple entities or the recharacterisation of professional income, without reflecting genuine business structures.

The following examples illustrate how Section 33 may apply in practice.

Incorporation of a company to receive personal services income 

Facts: A common structure involves medical professionals incorporating a private company to receive consultation fees. 
The company pays the medical professional, who is often the sole director and shareholder, a relatively low salary, leaving the residual profits to be taxed at the corporate tax rate of 17% (instead of the much higher individual marginal tax rates if no corporate vehicle is used). The after-tax profits are subsequently distributed to the individual as one-tier tax exempt dividend. 
Tax Outcome: In a Court case involving such an arrangement, IRAS disregarded the corporate structure and treated the revenue as services income earned by the medical professional. This was because the individual performed substantially all of the services and the corporate setup lacked genuine commercial justification. The absence of commercial substance, particularly where the medical professional is the sole shareholder, director and service provider, supported the recharacterisation. 
Key Insight: The incorporation of a company to receive income is not impermissible if there are commercial reasons for doing so. However, if the company plays a limited commercial role beyond acting as a receiving vehicle to receive income and the primary purpose is to shift personal exertion income into lower-taxed corporate structure purely for tax savings, the arrangement may be viewed as tax avoidance and Section 33 would likely apply.

Multi-entity structures and income splitting 

Facts: IRAS has highlighted cases involving medical professionals who established multiple companies to provide the same medical services to the same clients, while using the same group of staff across all companies. Income and expenses were artificially allocated among the companies at year end. 
The individuals concerned drew modest salaries from each entity and extracted after-tax profits via dividends or shareholder loans. 
Tax Outcome: IRAS invoked Section 33 on the basis that the multiple companies lacked sufficient commercial substance and were conduits with minimal independent commercial functions or activities. The intent was to maximise the benefits of the Start-up Tax Exemption Scheme and the low effective tax rates applicable to the first $200,000 of chargeable income across several companies, even though the income arose from the same medical services rendered by the same practitioners to the same clients.  
IRAS disregarded the artificial arrangement, consolidated the profits across entities and attributed them back to the medical professionals or a single operating company.
Key Insight:  Incorporating multiple companies to artificially fragment income is a common indicator of tax avoidance. IRAS does not tolerate the misuse of the Start-up Tax Exemption Scheme which is intended to support genuine start-ups and not for repeated exploitation by established professional practices to artificially reduce their personal tax liabilities or to shift profits into lower-taxed structures.

Artificial re-incorporation of the same business

Facts: The business concerned secured multiple rounds of start-up tax exemptions by winding up an existing company and incorporating a new entity every three years, while continuing the same business activities. Although each new company was technically a separate legal person, the business continued to be operated by the same practitioner, offering the same services and operating from the same business premises.
Tax Outcome: The CIT disregarded the repeated re-incorporations, as it did not constitute a bona fide commercial restructuring. Instead, the business was treated as having continued through a single entity as the sole aim of the transaction was to refresh eligibility for the Start-up Tax Exemption Scheme and reduce overall tax liability.
Key Insights: The CIT is empowered to disregard artificial transactions that lack commercial justification. In this case, where a re-incorporation does not involve any genuine business transformation and the primary aim was to gain a fresh set of tax exemptions and reduce overall tax liability, Section 33 would apply. 

Attribution of income or profits not aligned with economic reality 

Facts: IRAS conducts regular audits on different groups of taxpayers. Through such audits, it identified companies that paid remuneration to their medical professionals (who performed the bulk of the services) at a rate which was not commensurate with their skillsets or aligned with the market rates for comparable services. 
The medical practitioners paid themselves disproportionately low salaries, leaving the excess profits in the company to be taxed at lower corporate tax rate and before distributing the after-tax profits as one-tier tax exempt dividends to the individuals. 
Tax Outcome: IRAS re-characterised part of the residual profits as additional personal remuneration and subjected the amounts to tax at the applicable individual income tax rates.
IRAS generally uses one of the following two methods to determine the company’s share of the profits and the practitioners’ personal services income.
•    Market salary benchmark – Determine the market rate services income to the practitioners based on the areas of expertise, years of experience, roles and duties performed by the individuals and the fees paid for such similar specialist services in the market.
•    Cost-plus method - Allocating a reasonable profit margin to the company (e.g. 10% for specialist services or 15% for dental and general practitioners services), with the balance attributing to the practitioners as taxable personal income. 
Key Insight: While incorporation and business structuring may be legitimate if supported by genuine commercial reasons, artificial arrangements designed primarily to reduce tax liabilities will be challenged. The application of Section 33 in these cases reflects IRAS position that professional income should generally be attributed to the individual who renders the substantive professional services.

Judicial interpretation

Singapore Courts have grappled with the scope of Section 33 in a number of cases, particularly in balancing legitimate tax planning against impermissible tax avoidance. The leading authority is the Court of Appeal decision in CIT v AQQ and another appeal [2014] SGCA 15 where the Court laid down a three-step framework for the application of Section 33:

  • Identification of the arrangement and application of the “purpose or effect” test
    Examine the structure and steps of the arrangement to determine whether they fall within any of the threshold limbs set out in Section 33(1) of ITA, and whether their purpose or effect is to avoid or reduce tax liability.
  • Bona fide commercial purpose exception
    Even if the arrangement falls within Section 33(1), it will not be struck down if it is carried out for bona fide commercial reasons and does not result in tax avoidance.
  • Consistency with specific provisions in the ITA
    Consider whether the taxpayer’s reliance on specific provisions of the ITA falls within the scope and the purpose intended by Parliament. This reflects a purposive interpretation of the ITA, ensuring that the statutory provisions are not used in a manner contrary to their legislative intent.

In articulating this framework, the Court emphasised that Section 33 adopts a substance over form approach. Even where the individual steps of an arrangement are legally valid, they may be disregarded if tax avoidance is found to be the dominant purpose.

 

Contact Us

Section 33 is a cornerstone of Singapore’s tax regime ensuring that the line between tax planning and tax avoidance remains clear. While businesses and individuals are free to organise their affairs in a tax-efficient manner, arrangements lacking genuine commercial substance or designed primarily to secure tax advantages will not be upheld.

With the recent introduction of Section 33A surcharge, IRAS has further strengthened its enforcement stance to deter abusive tax arrangements.

Ultimately, Section 33 reinforces the principle that tax benefits must flow from genuine commercial activities, not contrived steps designed to exploit statutory provisions. 

Speak to one of our specialists before implementing any proposed structuring plans to ensure they are commercially robust and do not inadvertently fall within the scope of Section 33.  

Get in touch with our specialists 

Koh Puay Hoon
Partner & Head of Tax Advisory
+65 6594 7820
KohPuayHoon@RSMSingapore.sg 
Andrew Tan
Senior Director, Dispute Resolution
+65 6594 7859
AndrewTanBL@RSMSingapore.sg 
Jamie Chuah
Senior Manager, Dispute Resolution
+65 6594 7318
JamieChuahJX@RSMSingapore.sg