Look up how to avoid capital gains tax in the UK and you find lists of tricks. UK law offers none: no rule makes a gain vanish. What it offers is allowances, exemptions and reliefs that Parliament wrote on purpose, to reduce or defer the tax legally.
Each one sits on top of how capital gains tax works, and each carries a condition, a ceiling and a date. The harder question is where HMRC stops calling it planning.
The word itself causes the confusion. HMRC keeps “avoidance” for something other than using a relief. According to HM Treasury and HMRC (2019), “Tax planning involves using tax reliefs for the purpose for which they were intended”, and it “is not tax avoidance”.
A gain is taxed in one person's name, in one tax year, on an asset held in one way. The rules attach different consequences to each of the three, within conditions and limits.
For the 2026 to 2027 tax year, you pay 18% or 24% on gains above the annual exempt amount. The rate depends on your taxable income: 24% if you are a higher or additional rate taxpayer, 18% on the part of your gains that stays within the basic rate band. The sale of a home follows its own relief.
Three allowances renew every tax year, each with a ceiling.
| Allowance | Amount | What it does to a gain | Limit |
|---|---|---|---|
| Annual exempt amount | £3,000 per person (2026 to 2027) | The first £3,000 of gains in the year is not taxed | Cannot be carried forward or back; lost if unused |
| ISA | £20,000 of subscriptions (2026 to 2027) | Gains on investments inside it are outside Capital Gains Tax | New money from UK residents only |
| Pension | £60,000 annual allowance, as shown on GOV.UK in October 2026 | Gains on scheme investments are exempt | Money is locked in the scheme |
According to HMRC (2026), the annual exempt amount is £3,000 for 2026 to 2027, against £12,300 in 2022 to 2023. You have one, your spouse has another, and no claim is needed. The rules set it against the gains taxed at your highest rate first.
A pension contribution does not exempt a gain you have already realised outside the scheme.
The ISA limit is £20,000 for 2026 to 2027, kept until April 2031. Shares you already hold must be sold first, and HMRC states that “the sale of the investments is a disposal for capital gains purposes”. The move can therefore create a gain of its own. The ISA cannot buy the shares from you or from your spouse.
After a move abroad, to Dubai for instance, you can pay no new money into an ISA, but you can keep it and it stays tax-free in the United Kingdom. Other countries read the wrapper differently, starting with how the US treats a UK ISA.
It moves the gain. It does not erase it.
Under section 58 of the Taxation of Chargeable Gains Act 1992, a transfer between spouses or civil partners who live together is treated as made at no gain and no loss, and the one who receives takes over the original cost. That spouse is taxed at the later sale, with their own exempt amount and their own rate band.
Take a married couple living together in 2026 to 2027:
| Step | One spouse sells | After a transfer of half: first spouse | After a transfer of half: second spouse |
|---|---|---|---|
| Gain | £70,000 | £35,000 | £35,000 |
| Annual exempt amount | £3,000 | £3,000 | £3,000 |
| Taxable gain | £67,000 | £32,000 | £32,000 |
| Tax | £67,000 at 24% = £16,080 | £32,000 at 24% = £7,680 | £22,700 at 18% = £4,086, then £9,300 at 24% = £2,232: £6,318 |
| Household total | £16,080 | £13,998 (both spouses) | Included |
The tax would be £2,082 lower: one extra exempt amount (£3,000 at 24%, or £720) and six points on the £22,700 taxed at 18% instead of 24% (£1,362). If both spouses were higher rate taxpayers, the difference would be the £720 alone. The result depends on the second spouse's unused basic rate band and is no general rule.
HMRC notes that taxpayers can arrange their affairs to obtain more than one exempt amount against the disposal of one asset, and adds: “In some circumstances we can challenge such arrangements.”
The rule requires a real transfer of ownership. HMRC taxes the beneficial owner and looks at who received the proceeds. Unmarried partners are outside it.
A loss cannot be claimed on such a transfer. A transfer between spouses is also a gift, and a second tax reads gifts under its own rules, those of inheritance tax planning for UK estates.
A transfer between spouses or civil partners who live together is treated as made at no gain and no loss. The one who receives takes over the original cost and is taxed at the later sale.
The exempt amount and the basic rate band are both annual, and the tax year changes on 6 April. A disposal belongs to the year in which the unconditional contract is made, not the year you are paid. A holding sold in two parts either side of 5 April therefore meets two exempt amounts and two rate bands.
The gain is not reduced, only split. The market can move between the two dates, which no tax rule covers, and the rates and exempt amount for 2027 to 2028 are not known.
A loss of the same year is deducted from that year's gains first, before the exempt amount, even if that wastes part of it. A loss brought forward is used only down to the level of the exempt amount, and the rest carries on. Neither counts unless you claim it, within four years after the end of the tax year of the disposal.
A loss is not allowable if it arises from arrangements whose main purpose, or one of the main purposes, is to secure a tax advantage.
When you sell shares, the rules match them in this order:
Selling and buying back within 30 days therefore normally reduces or removes the gain or loss the sale would have shown. The rule dates from 1998 and applies to shares “acquired by the same person in the same capacity”.
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Begin Your Journey With UsMost reliefs defer or cap a gain. Few exempt it.
| Relief | Who it is for | Effect on the gain | Limit |
|---|---|---|---|
| Business Asset Disposal Relief | Sole trader or partner; employee or office holder with at least 5% of a trading company, for at least 2 years | 18% on qualifying gains from 6 April 2026 | £1 million over a lifetime, per person |
| Investors' Relief | Outside investor in an unlisted trading company; shares issued from 17 March 2016, held at least three years | 18% from 6 April 2026 | £1 million over a lifetime (disposals from 30 October 2024) |
| EIS | Investor in qualifying shares | No tax on EIS shares held at least 3 years with income tax relief received; another gain can be deferred | The deferred gain revives when the EIS shares are disposed of |
| SEIS | Investor in qualifying shares | “a maximum of 50% of the gain” reinvested is treated as exempt | “up to a maximum of £100,000” |
| Gift Hold-Over Relief | Giver of business assets, or of shares in an unlisted trading company or personal company; joint claim | No tax at the gift; the recipient takes on the gain and pays on a later sale | A transfer of the gain, not an exemption |
From 6 April 2026, the Business Asset Disposal Relief rate of 18% equals the rate you already pay within the basic rate band. The advantage is six points against the 24% rate, on at most £1 million of lifetime gains.
EIS and SEIS shares are shares in small unlisted companies. The official sources describe the tax rule only, and nothing on returns.
No Capital Gains Tax is due on an asset you give to charity. For land, property and shares, the donor can also deduct the value from taxable income in the tax year of the gift.
A gift to a relative other than your spouse is a disposal at market value. What a gift does for the next generation is the wider subject of wealth transfer strategies.
HMRC draws the line in one sentence. Avoidance is “bending the rules of the tax system to try to gain a tax advantage that Parliament never intended” (HMRC, 23 June 2026). Its warning signs are plain:
The reply is short: “HMRC does not approve tax avoidance schemes.”
In Spotlight 69 of 28 April 2025, HMRC describes a scheme marketed to landlords, which moves properties into a Limited Liability Partnership that is then liquidated, to cut Capital Gains Tax. Its verdict: “HMRC's view is that this scheme does not work.”
The general anti-abuse rule of the Finance Act 2013 covers Capital Gains Tax, and HMRC's guidance says it “does not challenge” a taxpayer's choice between ways of carrying out a transaction “unless they are considered abusive”. On that scheme, HMRC “is also considering if the general anti-abuse rule (GAAR) may apply to these schemes”, and where it applies a penalty of 60% follows.
Narrower rules also sit inside Capital Gains Tax itself, such as the rule on losses seen above. Not declaring a gain is another matter: evasion, “always illegal”.
HMRC describes avoidance as bending the rules to gain a tax advantage that Parliament never intended, and lists plain warning signs. It does not approve tax avoidance schemes.
No lever is right in the abstract. Four questions can be put to any of them:
Residence changes the picture but does not switch the tax off. If you live abroad, you do not pay UK Capital Gains Tax on most UK assets such as shares, while UK land and property stay taxable. Gains made during a period of temporary non-residence come back into charge in the year of return, under conditions set by the UK residence rules. The UAE “does not levy income tax on individuals” (UAE Government portal, accessed October 2026), and that changes nothing in the British rule on a return.
Several of these levers interact with each other, over several tax years, and with where you live.
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Gains on shares held inside an ISA or a pension are outside the tax. Outside a wrapper, the first £3,000 of gains for 2026 to 2027 is exempt. Beyond that, the law reduces or defers the tax; it does not cancel it.
In general, yes: reinvesting does not cancel a gain. Some reliefs are exceptions, each with conditions:
The transfer itself is treated as made at no gain and no loss, for spouses or civil partners who live together. The one who receives takes over the original cost and is taxed at the later sale.
A relief that taxes qualifying disposals of a business, or of shares in a personal company, at 18% from 6 April 2026. For shares, it requires at least 5% held for at least 2 years. The limit is £1 million over a lifetime. Begin your journey with us.
A real loss can be set against gains once you claim it. Shares bought back within 30 days are matched with the sale. A loss arising from arrangements made mainly to secure a tax advantage is not allowable.
This guide is provided for general information purposes only and does not constitute financial or tax advice. Rules and rates are those shown on official UK sources in October 2026 for the 2026 to 2027 tax year and may change; the worked example is an illustration based on stated assumptions. Outcomes depend on individual circumstances.
