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What is an offshore fund for UK tax purposes?

Answered 11 March 2026

Here is a comprehensive answer on the definition of an offshore fund for UK tax purposes.


What the law says

The definition of an offshore fund for UK tax purposes is found in section 355 of the Taxation (International and Other Provisions) Act 2010 (TIOPA 2010). The definition is characteristics-based and is deliberately detached from the regulatory definition of a "collective investment scheme".

An offshore fund must be a "mutual fund" (as defined in s.356 TIOPA 2010) that is resident in, or based in, a territory outside the United Kingdom.

The "mutual fund" characteristics

Broadly, a mutual fund is a company, trust, or other vehicle or arrangement that meets all of the following characteristics:

  1. It is not UK tax resident;
  2. It exists to enable participants to take part in the benefits arising from the acquisition, holding, managing, or disposing of assets of any description;
  3. The participants do not have day-to-day control of the management of the property (whether or not they have the right to be consulted or give directions); and
  4. A "reasonable investor" would expect to be able to realise any investment based entirely or almost entirely by reference to the net asset value of the assets under management, or alternatively by reference to an index of any description.

The three legal forms

A mutual fund falls within the definition of an offshore fund if it takes one of three forms:

Form Statutory provision
A body corporate resident outside the UK s.355(1)(a) TIOPA 2010
Property held on trust for participants by trustees resident outside the UK s.355(1)(b) TIOPA 2010
Other arrangements creating rights in the nature of co-ownership, taking effect under the law of a territory outside the UK s.355(1)(c) TIOPA 2010

Exclusion: Foreign partnerships within the scope of s.355(1)(c) are specifically excluded from the definition of an offshore fund by section 355(2) TIOPA 2010.

The same definition in s.355 TIOPA 2010 applies across multiple tax codes, including for income tax, corporation tax, and capital gains tax purposes.


HMRC guidance / practice

Purpose of the regime: The offshore fund rules were first introduced in 1984 to prevent UK investors from accumulating income in an offshore fund free of tax and then realising it as a capital gain rather than income. The rules were substantially updated in 2009 and are now contained in Part 8 of TIOPA 2010 and The Offshore Funds (Tax) Regulations 2009 (SI 2009/3001).

Reporting vs. non-reporting funds: Under the current regime, an offshore fund is either a "reporting fund" or a "non-reporting fund". Capital gains treatment on disposal is only available to UK investors if the fund reports its income to them (a reporting fund). If it does not (a non-reporting fund), gains on disposal are taxed as income rather than capital gains.

Investor's responsibility: It is the investor's own responsibility to determine whether they hold an interest in an offshore fund as defined. HMRC publishes a monthly updated list of funds that have successfully applied for reporting fund status on GOV.UK.

Transparent funds: Where an offshore fund is transparent for UK tax purposes, income arises from the underlying assets rather than from the fund itself. In that case, the remittance basis does not apply to income arising in the UK; it is charged to tax on the UK resident individual as it arises.


Citation sources

1 MANUAL
Offshore Funds: introduction: background to the treatment of UK investors in offshore funds

A tax regime for UK investors in offshore funds was first introduced in 1984. Its purpose was to counter arrangements that had enabled investors within the charge to UK tax (‘UK investors’) to accumulate income in an offshore fund free of tax and, when the investment was realised, to be subject only to tax on capital gains instead of having to pay tax on income. By way of contrast, UK investors had to pay tax annually on income from UK funds. The ‘offshore fund rules’ were substantially updated

HMRC guidance
2 MANUAL
Offshore Funds: Definition of an offshore fund: Meaning of ‘offshore fund’: introduction – s355 TIOPA 2010

The definition of an offshore fund is limited to ‘mutual funds’ which take one of three forms (see below) and which are resident in, or based in, a territory outside the United Kingdom. The meaning of the term ‘mutual fund’ is given by section 356 TIOPA 2010, and is explained in more detail at IFM12231 onwards. Those pages discuss each type of mutual fund in more detail, but broadly the definition is applied to a company, trust or any other vehicle or arrangement that meets the following charact

HMRC guidance
3 LEGISLATION
Corporation Tax Act 2009

Part 6 Relationships treated as loan relationships etc Chapter 3 OEICs, unit trusts and offshore funds Introduction Meaning of “offshore fund” etc 489 Sections 355 to 363 of TIOPA 2010 (meaning of “offshore fund” and application to parts of umbrella funds and classes of interests in offshore funds) apply for the purposes of this Chapter as they apply for the purposes of Part 8 of that Act.

Primary legislation
4 MANUAL
Offshore Funds: participants in offshore funds: participants within the charge to income tax: non-UK domicile: remittance basis

In a case where the offshore fund is transparent for UK tax purposes then the income will arise from the underlying assets and not from the fund. In such a case, the income may sometimes arise in the UK (even though the fund itself is domiciled offshore). Where the income arises in the UK the remittance basis does not apply – the income is charged to tax on the UK resident individual as it arises. Where the income arises offshore then the remittance rules will apply.

HMRC guidance
5 MANUAL
Offshore Funds: Overview of the offshore fund rules: introduction

The tax regime for UK investors in offshore funds, introduced in 1984, was established on the basis that, if an offshore fund did not distribute at least 85% of its income then, on disposal of interests in the fund, UK investors would be charged to tax on income rather than on capital gains. This was to prevent the possibility of rolling up income in an offshore fund with any subsequent disposal being subject only to tax on capital gains, rather than being charged to tax as income. The rules wer

HMRC guidance
6 MANUAL
Offshore Funds: Definition of an offshore fund: Meaning of ‘offshore fund’: introduction – s355 TIOPA 2010

hore fund by section 355(2) TIOPA 2010. See IFM12214 for examples of the types of arrangements that are within the definition of an offshore fund, and IFM12216 for examples of the types of arrangements that are not within the definition of an offshore fund.

HMRC guidance
7 LEGISLATION
Taxation of Chargeable Gains Act 1992

Part VI Companies, oil, insurance etc. Chapter III Insurance Power to modify ss. 212 and 213 etc in case of CFCs that are offshore funds 213A 1 The Treasury may make regulations for the purpose mentioned in subsection (2) in any case where— a an insurance company to which the I - E rules apply is deemed to make a disposal under section 212 of an interest in an offshore fund, b the offshore fund is a CFC, and c there is (or, but for the regulations, would be) a CFC charge on the insurance company

Primary legislation
8 MANUAL
Offshore Funds: Introduction: Overview of the offshore fund rules: classification of funds

The offshore fund rules only apply to holdings in collective investment vehicles that come within the definition of an ‘offshore fund’ as set out at section 355 (1) TIOPA 2010 - see IFM12200 onwards. UK investors should be able to get this information from their adviser or directly from the fund itself. It is the investor’s responsibility to ensure that they know whether they hold an investment in an offshore fund, as defined. Once the UK investor has determined that a particular arrangement is

HMRC guidance