Statute Details
- Title: Income Tax (Prescribed Interest Rate for Section 93(9)(e)) Rules 2024
- Act Code: ITA1947-S252-2024
- Legislation Type: Subsidiary Legislation (SL)
- Authorising Act: Income Tax Act 1947 (powers under section 7(1))
- Enacting Authority: Minister for Finance
- Date Made: 28 March 2024
- Commencement: 1 April 2024
- Current Version Status: Current version as at 27 March 2026
- Key Provision: Section 3 (prescribed interest rate for section 93(9)(e) of the Income Tax Act 1947)
- Core Formula: 1.5 percentage points above the 3-month compounded SORA
What Is This Legislation About?
The Income Tax (Prescribed Interest Rate for Section 93(9)(e)) Rules 2024 is a short but practically significant set of rules that “prescribes” an interest rate for a specific purpose under Singapore’s Income Tax Act 1947. In plain terms, the Rules tell taxpayers and tax administrators what interest rate must be used when applying section 93(9)(e) of the Income Tax Act 1947 for certain interest periods.
Section 93 of the Income Tax Act 1947 generally deals with interest and related tax computations in particular contexts (including situations involving interest paid or deemed to be paid). Subsection 93(9)(e) requires the use of a “prescribed interest rate” rather than leaving the rate to be determined by reference to some ad hoc market measure. This subsidiary legislation therefore provides a clear, objective benchmark tied to Singapore’s benchmark overnight interest rate.
The benchmark chosen is the 3-month compounded Singapore Overnight Rate Average (“3-month compounded SORA”), published by the Monetary Authority of Singapore (“MAS”). The Rules then add a fixed spread of 1.5 percentage points. This approach ensures that the prescribed rate moves with market conditions while remaining predictable and administrable.
What Are the Key Provisions?
1. Citation and commencement (Rule 1)
Rule 1 provides the formal title and states that the Rules come into operation on 1 April 2024. For practitioners, this matters because the prescribed rate applies only to “any part of any interest period falling on or after 1 April 2024” (as reflected in Rule 3). Where an interest period straddles 1 April 2024, careful time apportionment may be required to determine which portion is subject to the new prescribed rate.
2. Definitions: what “3-month compounded SORA” means (Rule 2)
Rule 2 is the technical heart of the Rules. It defines “3-month compounded SORA” by reference to MAS’s published compounded average of SORA values for a 3-month period, computed using the “prescribed methodology” in a MAS user guide (the document titled “Compounded Singapore Overnight Rate Average Index (“SORA Index”), Compounded SORA and MAS Floating Rate Notes (“MAS FRN”): A User Guide” dated 16 March 2021).
The definition includes two timing windows, which are crucial for correct calculation:
- Periods falling within the 6-month period beginning on 1 April of a calendar year: the 3-month compounded average is computed and published by MAS, and it is published on either 1 March (if it is a business day) or the last business day in February (if 1 March is not a business day).
- Periods falling within the 6-month period beginning on 1 October of a calendar year: the 3-month compounded average is computed and published by MAS, and it is published on either 1 September (if it is a business day) or the last business day in August (if 1 September is not a business day).
Rule 2 also defines “business day” (any day other than Saturday, Sunday or public holiday), “prescribed methodology”, and “SORA” itself as the volume-weighted average rate of borrowing transactions in the unsecured overnight interbank Singapore dollar cash market in Singapore between 8 a.m. and 6.15 p.m., as published by MAS.
3. Prescribed interest rate for section 93(9)(e) (Rule 3)
Rule 3 sets the operative rule: for any part of any interest period falling on or after 1 April 2024, the prescribed interest rate for the purposes of section 93(9)(e) of the Income Tax Act 1947 is:
1.5 percentage points above the 3-month compounded SORA.
This is a simple arithmetic adjustment, but it depends on the correct identification of the applicable “3-month compounded SORA” value under Rule 2’s timing windows. In practice, tax computations should therefore document (i) the relevant interest period dates, (ii) whether the relevant portion falls within the 1 April–30 September window or the 1 October–31 March window, and (iii) the MAS-published compounded SORA value used.
4. Legislative making and presentation (final lines)
The Rules were made on 28 March 2024 by the Permanent Secretary, Ministry of Finance, and are stated to be “to be presented to Parliament under section 7(2) of the Income Tax Act 1947.” While this is procedural, it signals that the Rules are part of the formal legislative framework and should be treated as authoritative for the specified tax purpose.
How Is This Legislation Structured?
Despite its short length, the Rules follow a standard subsidiary legislation structure:
- Part/Section 1: Citation and commencement—sets the effective date (1 April 2024).
- Part/Section 2: Definitions—defines “3-month compounded SORA”, “business day”, “prescribed methodology”, and “SORA”. This section ensures the benchmark is calculated and published in a consistent way.
- Part/Section 3: Prescribed interest rate—provides the formula for the prescribed interest rate under section 93(9)(e) of the Income Tax Act 1947: 1.5 percentage points above the 3-month compounded SORA.
Who Does This Legislation Apply To?
This subsidiary legislation applies to taxpayers and tax administrators who must apply section 93(9)(e) of the Income Tax Act 1947 when computing tax outcomes involving the relevant interest period(s). While the Rules do not directly address categories such as individuals, companies, or non-residents, the underlying Income Tax Act provisions typically govern taxpayers subject to Singapore tax and the tax treatment of interest computations.
In practical terms, the Rules are most relevant to:
- Taxpayers whose transactions or tax positions require the application of section 93(9)(e) (including where an interest rate is prescribed by law rather than contract);
- Tax practitioners preparing computations, schedules, and supporting documentation for assessments, appeals, or compliance filings; and
- Advisers dealing with cross-border or financing arrangements where the statutory interest rate benchmark becomes a determinant of tax consequences.
Because Rule 3 applies to “any part of any interest period falling on or after 1 April 2024,” the Rules also have a temporal scope: they affect computations prospectively from that date, with potential apportionment for interest periods spanning the commencement date.
Why Is This Legislation Important?
Although the Rules are brief, they have a direct computational impact. The prescribed interest rate is often a key input into tax calculations. By prescribing a rate linked to a transparent market benchmark (SORA) and a fixed spread (1.5 percentage points), the Rules reduce uncertainty and provide a consistent method for determining the rate required by section 93(9)(e).
From a compliance and dispute-prevention perspective, the Rules also improve auditability. MAS publishes the relevant compounded SORA values using a specified methodology, and the Rules specify when those values are published (including the business-day rules). This allows taxpayers to verify the benchmark used and to defend their calculations with reference to official MAS publications.
For practitioners, the most important practical considerations are:
- Correct timing window selection: Determine whether the relevant portion of the interest period falls within the 6-month period beginning on 1 April or the 6-month period beginning on 1 October, because that affects which MAS-published 3-month compounded SORA value is applicable.
- Apportionment for transitional periods: If an interest period begins before 1 April 2024 and continues after, only the portion on or after 1 April 2024 is subject to the prescribed rate under these Rules.
- Documentation: Maintain evidence of the MAS publication used and the calculation steps (including the 1.5 percentage point uplift) to support tax computations.
In short, the Rules operationalise a statutory requirement by converting a legal reference (section 93(9)(e)) into a concrete, benchmark-based interest rate. This is exactly the kind of subsidiary legislation that can materially affect tax outcomes even though it is not lengthy.
Related Legislation
- Income Tax Act 1947 — in particular section 93(9)(e) (the provision for which the prescribed interest rate is required)
- MAS benchmark documentation — “Compounded Singapore Overnight Rate Average Index (“SORA Index”), Compounded SORA and MAS Floating Rate Notes (“MAS FRN”): A User Guide” dated 16 March 2021 (the “prescribed methodology” referenced in Rule 2)
Source Documents
This article provides an overview of the Income Tax (Prescribed Interest Rate for Section 93(9)(e)) Rules 2024 for legal research and educational purposes. It does not constitute legal advice. Readers should consult the official text for authoritative provisions.