01

The AEA — what it is, how it works, and the ordering rules

The annual exempt amount is a fixed threshold below which an individual's net chargeable gains in a tax year are not subject to CGT. Net chargeable gains are total gains minus total losses in the same tax year. The AEA is applied after losses — if losses reduce gains below £3,000, the AEA shelters any remaining gain. If losses exceed gains entirely, the AEA is irrelevant for that year.

The ordering rules for the AEA interaction with losses: (1) current year losses are deducted from current year gains; (2) the AEA is then applied to the net gain after losses; (3) any remaining gain above the AEA is taxable; (4) prior year carried-forward losses are only used to the extent needed to reduce the taxable gain above the AEA — not to reduce a gain that is already within the AEA. This preserves the AEA by preventing carried-forward losses from eating into it unnecessarily.

Example: an investor with £5,000 of gains, £1,500 of current year losses and £10,000 of carried-forward losses. Net gain after current year losses: £3,500. AEA: £3,000. Taxable amount before carried-forward losses: £500. Carried-forward losses used: £500 (only enough to eliminate the taxable amount). Remaining carried-forward losses: £9,500 for future years. The £10,000 of losses has been preserved — only £500 was needed.

The AEA cannot be carried forward. Unused AEA on 5 April is permanently lost — it does not accumulate. An investor who makes no disposals in 2026/27 wastes their entire £3,000 AEA. Systematic annual crystallisation of gains up to the AEA (bed-and-ISA) is the primary tool for using it.

02

Stacking the AEA with capital losses — the correct calculation

Capital losses from disposals in the current tax year must be offset against gains in the same year. This is mandatory — you cannot choose to carry losses forward and preserve the AEA against current year gains. The AEA is applied to the net gain after current year losses have been deducted.

The implication: if current year losses are large enough to reduce current year gains below £3,000, the AEA shelters any remaining gain but the losses are not carried forward (they are used to reduce gains, even within the AEA). Example: £8,000 gains, £6,000 current year losses. Net gain: £2,000. AEA: £3,000. The full £2,000 is sheltered — zero CGT. But the £6,000 of losses have been 'wasted' against the AEA rather than being available to carry forward.

The planning implication: where possible, crystallise losses and gains strategically so that gains fall just within the AEA and losses are preserved for future years. If you have £6,000 of unrealised gains and £6,000 of unrealised losses: crystallising all gains and all losses in the same year results in zero net gain and zero carried-forward losses. Alternatively, crystallising only £3,000 of gains (within AEA) and no losses produces: £3,000 AEA-sheltered gain, £6,000 of losses still unrealised and available for future years.

However, the decision is not purely mechanical — it depends on whether the loss-making position is expected to recover (in which case crystallising the loss and repurchasing similar assets in the ISA is beneficial regardless) or whether holding is preferable (in which case the loss should be preserved unrealised unless offset against gains above the AEA).

03

Spousal and civil partner transfers — doubling the household AEA

A married couple or civil partners can effectively double the household AEA from £3,000 to £6,000 by using both partners' allowances. The mechanism: transfer assets between spouses at no gain/no loss (s58 TCGA 1992) before disposal, then both partners crystallise gains up to their individual £3,000 AEA.

The transfer itself is tax-neutral — no CGT arises on the spousal transfer regardless of the embedded gain. The transferee spouse acquires the asset at the transferor's original cost base (not the market value at transfer). The CGT is calculated against the original cost when the transferee subsequently disposes of the asset.

Example: a GIA holding with an embedded gain of £6,000 held entirely in one partner's name. Without spousal planning: crystallising the full £6,000 gain uses the £3,000 AEA and £3,000 is taxable at 24% = £720 CGT. With spousal planning: transfer 50% of the holding to the other partner (no gain/no loss, each partner now has a £3,000 embedded gain). Both partners sell their 50% share: both £3,000 gains are within AEA. CGT: £0. Saving: £720 from one spousal transfer.

The limitation: both partners must have their full £3,000 AEA available (not already used by other disposals in the tax year). And the transfer must be genuine — the assets legally belong to the recipient partner after transfer. A nominal transfer that is immediately reversed would be challenged by HMRC under the settlement rules.

04

Non-resident CGT and the AEA

UK non-residents are subject to UK CGT on disposals of UK residential property (NRCGT) and certain other UK assets. The AEA is available to non-residents for NRCGT purposes in the same way as for UK residents — a non-resident disposing of UK residential property can offset the first £3,000 of gains against the AEA.

For non-residents who are non-UK domiciled: the UK tax rules for overseas assets differ from UK residents. Non-UK domiciled individuals are generally only subject to UK CGT on UK situs assets — overseas assets are outside the scope of UK CGT regardless of the AEA. However, from April 2025 the remittance basis for long-term non-doms was abolished — non-doms who have been UK resident for four or more tax years are now taxed on a arising basis on worldwide income and gains.

For UK domiciled individuals who are temporarily non-resident: if a UK-domiciled individual becomes temporarily non-resident (leaves the UK for less than five complete tax years), they can remain liable to CGT on gains accrued while UK resident — these gains are brought back into charge in the year of return. The AEA is available in that year for these 'temporary non-resident' gains.

05

The AEA in the context of a broader CGT strategy

The AEA is a useful annual tool but should be understood in the context of a comprehensive CGT strategy rather than as a standalone planning device. The £720 annual CGT saving for a higher rate taxpayer from the AEA is modest — the bigger prize is the ISA wrapper that eliminates CGT entirely on investments sheltered within it.

Priority order for CGT planning in 2026: (1) maximise ISA contributions each year — permanently removes £20,000 of investment value from CGT scope; (2) maximise pension contributions — investments inside pension wrappers have no CGT; (3) use bed-and-ISA to migrate existing GIA holdings into ISAs at zero CGT cost; (4) use the annual AEA to crystallise the remaining GIA gains on holdings not yet transferred to ISA; (5) use capital losses to reduce gains above the AEA; (6) consider spousal transfers to double the household AEA usage.

For investors who have exhausted ISA and pension allowances and hold significant GIA portfolios: the combination of annual AEA usage, spousal transfers, loss harvesting and systematic bed-and-ISA migration is the most tax-efficient approach to managing the GIA portfolio. These strategies combined can reduce the effective CGT rate on the portfolio from 24% toward near-zero over a 10 to 15-year migration horizon.