Excess Reportable Income on Accumulating Offshore Funds: A Guide for UK Advisers

Published 3 November 2026 by Steffan Kharmaaiarvi, founder

A UK client who holds an accumulating Irish or Luxembourg ETF in a general investment account receives no distribution, yet has income to declare every year. That income is excess reportable income: the part of a reporting fund's reported income that was not paid out. This note explains when it is taxed, whether it is a dividend or interest, how it raises the base cost so the same money is not taxed twice, and where the per-unit figures come from.

Not tax advice: decision support for a professional conversation. Confirm the client's position with their tax adviser.

What excess reportable income is

A UK resident's holding in a fund that is not resident in the UK is taxed under the offshore funds rules, and the fund's UK reporting status decides how (see UK reporting fund status). For a reporting fund that is not transparent, regulation 94 of the Offshore Funds (Tax) Regulations 2009 treats the excess of the fund's reported income for a reporting period over the distributions made for that period as additional distributions to the participants, in proportion to their rights.

HMRC's helpsheet HS265 Offshore funds calls the same figure excess reported income, and puts it plainly: UK investors are taxed on their full share of reportable income, even if it has not been distributed. For an accumulating share class the distributions are nil, so all of the reported income is excess. Issuers usually call it excess reportable income (ERI).

When it is taxed, and to whom

• The date. The excess is treated as made on the fund distribution date, or on an earlier date if the reported income is recognised in the participant's accounts (reg. 94(3)). The fund distribution date is six months after the last day of the reporting period (reg. 94(4)).
• The tax year. The income belongs to the tax year containing that date. HS265's example: a period ending 31 July 2024 has a fund distribution date of 31 January 2025, so the excess goes on the 2024-25 return.
• The holder. It is treated as made to participants holding an interest at the end of the reporting period (reg. 94(3)). A client who sells after the period end but before the distribution date still has the income; one who buys after the period end does not.
• Selling and buying back. If a client disposes of units in one period and the disposal is identified, under the 30-day rule in TCGA 1992 s.106A, with units bought in the next period, the disposal is ignored and the client is treated as still holding at the period end (reg. 94(3A)). See Section 104 pooling and the 30-day rule.

Dividend or interest

HS265 says that where more than 60% of a fund's investments are in interest-bearing assets, the income is reported as interest; otherwise a company fund's income is reported as a dividend. The legislation is ITTOIA 2005 s.378A: a dividend paid by an offshore fund is treated as interest if the fund fails the qualifying investments test at any time in the relevant period, meaning its qualifying investments exceed 60% of the market value of its assets.

The difference matters. Dividends use the £500 dividend allowance and, for 2026-27, rates of 10.75%, 35.75% and 39.35% (HMRC, Tax on dividends); interest is taxed as savings income. Issuers' reports state the classification: Vanguard's report has a column reading "Equity Fund" or "Bond Fund" for each share class.

Adding it to the Section 104 cost

Because the income has already been taxed, it is not taxed again as a gain. Regulation 99 treats an amount equal to the accumulated undistributed income on which the participant has been charged to tax as expenditure on acquiring the interest, within TCGA 1992 s.38(1)(a). HS265 says the same in practical terms: excess reported income that arose while the client owned the units can be deducted when calculating the gain.

In practice, record each year's figure against the holding and add it to the Section 104 pool's cost. Missing it means paying Capital Gains Tax on income the client has already paid Income Tax on. HS265 does not name an exchange rate for figures reported in dollars or euros; for foreign-currency amounts generally, HMRC's manual CG78310 says it does not prescribe a reference point but expects a reasonable and consistent method.

Where the figures come from

Each reporting fund makes a report to investors for every reporting period, giving per share class the income distributed, the excess of reportable income over distributions per unit and the fund distribution date. HMRC's list of reporting funds confirms the share class's status by ISIN; the issuer's report gives the numbers. The Vanguard Funds plc report for periods ended 30 June 2025, for example, lists each share class with its ISIN, reporting period, distribution, excess per share, fund distribution date, classification and whether it was still a reporting fund. Distributing and accumulating classes of the same fund can have different figures, so use the class the client owns.

A worked example (illustrative)

A UK-resident client holds 1,000 shares of Vanguard S&P 500 UCITS ETF, USD Accumulating (ISIN IE00BFMXXD54), in a general investment account on 30 June 2025. The per-share figures are from Vanguard's report; the exchange rate is illustrative, not a published rate.

The client declares £887.11 of dividend income for 2025-26, although no cash was paid, and the Section 104 cost of the holding rises by £887.11. If the client later sells all 1,000 shares in 2026-27 with a gain of £20,000 before the adjustment, the chargeable gain is £19,112.89; at the 24% rate for 2026-27 (HMRC, CGT rates and allowances) that is £212.91 less Capital Gains Tax than if the adjustment were forgotten.

Common mistakes

• "Nothing was paid, so nothing to declare." Accumulating reporting funds produce taxable income every year outside an ISA.
• Using the period end's tax year. The income falls in the year of the fund distribution date, six months later.
• Forgetting the cost uplift. Each year's excess is added to the base cost on sale.
• Treating bond-fund income as dividends. A fund over the 60% test reports interest.
• Reading the wrong share class. Figures are per class and per period.

What Borderfolio shows

• A finding for UK residents. "Excess reportable income to declare" for the last completed tax year, covering offshore funds held outside ISAs and pensions, account by account.
• Units from the transactions. Units held at each period end come from the confirmed transactions; the income is placed in the tax year of the fund distribution date.
• Figures from issuers' reports only. A catalogue of 549 reporting periods for 82 share classes from 2019 to 2025 (Vanguard, iShares, Invesco, SPDR, Xtrackers and HSBC), each row linked to the issuer's report.
• Dividend and interest apart. Split by the issuer's classification, converted to sterling at the reference rate on the fund distribution date, labelled as an assumption.
• Cost uplift. The same amounts are added to the Section 104 cost, so the cost of a switch and the gain shown on leaving the UK do not tax them twice.

Not modelled: a fund without a report on file is named and no total is given, never estimated (the 2025 reports for IVV and QQQ were not found); funds sold since the period end are not traced; equalisation, income from reporting funds held through other funds and the earlier date under reg. 94(3) are not applied; the tax on the income is not computed. The cross-border documentation describes how findings are worded.

Sources: HMRC HS265 Offshore funds, SI 2009/3001 reg. 94, reg. 99, ITTOIA 2005 s.378A, Vanguard Funds plc ERI report, 30 June 2025, HMRC list of reporting funds, HMRC, Tax on dividends, HMRC, CGT rates and allowances, HMRC CG78310.

Frequently asked questions

Is excess reportable income taxable when nothing is paid out?

Yes. A reporting fund's reported income in excess of its distributions is treated as an additional distribution to investors (Offshore Funds (Tax) Regulations 2009, reg. 94), so an accumulating share class held in a general account produces income to declare every year.

In which tax year is excess reportable income taxed?

In the tax year containing the fund distribution date, which is six months after the end of the fund's reporting period. It belongs to whoever held units at the end of that period.

Is excess reportable income a dividend or interest?

A dividend, unless more than 60% of the fund is in interest-bearing assets for the relevant period. A bond fund that fails that qualifying investments test reports interest (ITTOIA 2005 s.378A).

Does excess reportable income reduce the gain on sale?

Yes. The accumulated undistributed income charged to tax is treated as acquisition expenditure on disposal (reg. 99), so it is added to the cost and the same money is not taxed twice.

Does an ISA holding need to be declared?

No. HMRC's helpsheet HS265 says income and gains from funds held through an ISA do not need to be declared.