How ETFs are taxed in the UK: accumulating funds, ERI and capital gains

An ETF held outside an ISA or SIPP can create UK tax before you sell it and, with an accumulating ETF, even when no cash reaches your account.

The calculation depends on more than whether the ETF says “Acc” or “Dist”. You need to know where you hold it, whether the exact share class has UK reporting-fund status and whether its income is treated as dividends, interest or another category. Those details decide what you report each year and whether a later sale is taxed under Capital Gains Tax or Income Tax.

The part most investors miss is excess reportable income, or ERI. A reporting offshore fund can allocate income to you without paying it out. You declare that income for the relevant tax year, then add it to the ETF’s allowable cost so the same amount is not taxed again when you sell.

How are ETFs taxed in the UK?

ETFs held in a General Investment Account can produce taxable income while you own them and a taxable gain when you sell. Distributions and ERI are dealt with under the income rules. Under HMRC’s offshore-fund guidance, a disposal is normally dealt with under Capital Gains Tax when the ETF has maintained UK reporting-fund status, while a gain on a non-reporting offshore fund is usually charged to Income Tax instead.

Most ETFs available to UK retail investors are domiciled outside the UK, often in Ireland or Luxembourg. That makes the offshore-fund rules central to the calculation, even when you bought the ETF through a UK broker and traded it in pounds on the London Stock Exchange.

How are accumulating ETFs taxed in the UK?

An accumulating ETF can create taxable income even though the income is reinvested inside the fund. If the ETF is a UK reporting fund, it calculates reportable income for each reporting period. Any amount above the distributions paid to investors is ERI.

For an accumulating share class, little or no income is paid in cash, so much of the reportable income may appear as ERI. You are treated as receiving it on the fund distribution date, normally six months after the end of the fund’s reporting period. That date decides which UK tax year includes the income.

Do not assume that “accumulating” and “reporting” mean the same thing. Accumulating describes what the share class does with income. Reporting-fund status is a UK tax status granted by HMRC. You must check both.

What is excess reportable income (ERI)?

Excess reportable income is the part of a reporting offshore fund’s reportable income that was not distributed to you. The fund publishes an amount per unit in its annual report to participants. You multiply that figure by the units you held at the end of the reporting period, apply any required equalisation adjustment and convert the result into pounds.

The income is treated as arising on the fund distribution date, which is normally six months after the reporting period ends. If the report is not available before your filing deadline, HMRC says you should use your best estimate and amend the return when the final figure becomes available.

How ERI changes both income and the ETF’s cost

You hold 100 units of an accumulating equity ETF at the end of its reporting period. Its report to participants gives ERI of $0.50 per unit and a fund distribution date of 31 December 2026.

Using an exchange rate of £1 = $1.25 on that date, the ERI is:

100 units × $0.50 ÷ 1.25 = £40

You include £40 as foreign dividend income for the 2026/27 tax year, assuming the ETF is a corporate equity fund and no different classification applies.

• If the original allowable cost of the holding was £1,000, the £40 ERI increases it to £1,040. A later sale for £1,250 therefore produces a gain of £210 before fees and any matching-rule adjustments — not £250. This prevents the £40 from being taxed once as income and again as a capital gain.

How do you find an ETF’s UK reporting-fund status and ERI?

Start with the ISIN shown in your broker account. ETF names are reused across accumulating and distributing share classes, currencies and exchanges, while the ISIN identifies the holding you actually own.

• Copy the exact ISIN from the broker statement or the ETF factsheet.

• Search the HMRC list of approved offshore reporting funds and confirm that the matching share class had reporting status throughout your ownership.

• Open the fund provider’s annual “report to participants”, “UK reporting fund” or “reportable income” document for that ISIN.

• Find the reporting-period end, fund distribution date, ERI per unit and any equalisation information.

• Multiply the ERI by the units held at the reporting-period end and convert it into pounds for the fund distribution date.

• Report the income in the correct category and add the amount already taxed to the allowable cost used for a later disposal.

Your broker’s dividend statement may not contain the ERI figure, particularly for an accumulating share class. The fund provider’s report is therefore part of the tax record you need to keep.

Accumulating vs distributing ETFs: what changes for UK tax?

Accumulating and distributing share classes can both create taxable income outside an ISA or pension. The difference is mainly how much reaches your account in cash and how much remains to be identified through the fund’s report.

Reporting vs non-reporting ETFs: why the status matters

Reporting status determines more than the annual ERI calculation. It can change the tax applied when you sell. Check the exact share class before buying and retain evidence of its status for the full period you own it.

Are ETF distributions taxed as dividends or interest?

The answer depends on the legal form and investments of the fund. For a corporate offshore fund, income is generally treated as a foreign dividend unless more than 60% of its investments are in interest-bearing assets. In that case, commonly seen with bond ETFs, the income is treated as interest.

A transparent fund can preserve the original character of the underlying income, while a non-transparent unit trust may produce miscellaneous income. If the fund report does not state the UK classification clearly, ask the provider rather than assigning every ETF distribution to the dividend section.

The income category changes the rate and allowance

For 2026/27, the dividend allowance and rates are £500, 10.75%, 35.75% and 39.35%. Interest may instead fall within the Personal Savings Allowance and the savings rates. From 6 April 2027, the savings basic, higher and additional rates are scheduled to rise to 24%, 44% and 49%; this can affect ETF income classified as interest, but it does not change the core reporting-fund and ERI process.

How is Capital Gains Tax calculated when you sell an ETF?

When a reporting ETF is sold outside an ISA or pension, the disposal follows the UK share-matching rules. Units sold are matched first with acquisitions of the same share class made on the same day, then with acquisitions in the following 30 days, and finally with the Section 104 pool.

The Section 104 pool combines the units and allowable expenditure for the same share class across your taxable accounts. Broker boundaries do not create separate tax pools. Purchase costs, eligible dealing costs and ERI already taxed as income can increase the pool; disposals reduce it.

For 2026/27, individuals have a £3,000 annual exempt amount across their chargeable gains. Taxable gains above the available exemption are charged at 18% within the remaining basic-rate band and 24% above it. These rates do not apply to an offshore income gain from a non-reporting fund.

Where do you report ETF income and gains on Self Assessment?

Most Irish- or Luxembourg-domiciled ETFs are dealt with as foreign funds. Cash distributions and ERI therefore normally go through the Foreign pages, SA106, in the category that matches the fund: foreign dividends, foreign interest or another type of overseas income.

Gains and losses on the disposal of reporting funds normally feed into the Capital Gains Tax summary, SA108, when reporting is required. An offshore income gain from a non-reporting fund belongs in SA106 under “Other overseas income and gains”. If you hold a UK-domiciled fund, the income may instead belong on SA100.

For the wider filing process, including dividends, interest and disposals from other investments, use our guide to reporting investments on your UK Self Assessment. This article remains focused on calculating the ETF amounts that feed those pages.

Bring every ETF share class into one UK tax history

ETF tax is manageable once the records line up. For each share class, you need the correct ISIN, reporting status, cash distributions, ERI, sterling values and the transactions that build its Section 104 pool. Missing one year of ERI can understate income and overstate the gain when you eventually sell.

Finbooks brings your ETF transactions together with the rest of your broker history, applies the UK disposal rules and prepares the investment figures used for Self Assessment. Keep the fund’s own report to participants with your tax records: it provides the ERI and classification that a broker export may not contain.