Most articles about UK gold coins mention — somewhere — that they are "CGT-free". Few of them explain why, or what that actually means in practice. The mechanism is worth understanding, because it tells you exactly which coins qualify, why bars do not, and what circumstances might (rarely) cause the exemption not to apply.
The rule, plainly
Capital Gains Tax in the UK is governed by the Taxation of Chargeable Gains Act 1992. Section 21 of the Act sets out what counts as a chargeable asset, and Section 21(1)(b) specifically excludes "currency" from CGT. Sterling is currency. So gains on sterling are not chargeable.
The interesting question is what counts as "currency". For these purposes, anything that is legal tender in the UK is currency. The Royal Mint produces several gold coins that are legal tender by Act of Parliament: Sovereigns (since the Coinage Act 1971) and Britannias (since the Coinage Act 1971 as amended for the 1987 launch). Both have face values: a Sovereign is one pound, a Britannia is one hundred pounds. Those face values are nominal, not what the coin is worth, but the legal-tender status is what matters.
So when you sell a Sovereign or a Britannia, you are technically exchanging one form of sterling for another (the cash you receive). There is no chargeable gain, because both sides of the transaction are sterling.
Why it exists
The rule is not a loophole, and it was not introduced as an incentive for gold ownership. It is a structural feature of how Capital Gains Tax was designed: gains on currency are not taxed because, in the normal case, "currency" means cash, and you do not pay tax on the cash in your pocket every time you take it out and put it back. The rule simply applies the same logic to all forms of UK legal tender.
What is unusual is that some forms of UK legal tender (the gold coins) happen to be backed by a commodity that has appreciated meaningfully over decades. The CGT-free treatment was not designed for this case, but it applies to it.
The exemption has been in place since the introduction of CGT in 1965 in some form, and in its modern form since 1979. It has survived several major tax reforms.
Why coins, not bars
Gold bullion bars are not legal tender. They have no face value, no Act of Parliament minting them, no government endorsement of "this is currency". They are a commodity. So the rule above does not apply: bars are subject to CGT on the gain.
This is the single biggest tax-driven reason to choose coins over bars for UK investors. If you have an annual CGT allowance to play with (the figure changes; check the latest), you can sell some bar gold each year up to the allowance with no tax. Above the allowance, you pay CGT at 10 or 20 per cent depending on your overall position. With coins, the threshold is irrelevant: any gain is exempt regardless of size.
For an investor putting in a meaningful sum (£25,000+), the difference compounds. A £100,000 gain on coins is £100,000 in your pocket. A £100,000 gain on bars, with the personal allowance and a 20 per cent rate, is closer to £80,000 in your pocket. Per pound of gold metal owned, the after-tax outcome on coins is materially better.
What about VAT?
VAT is a separate matter. Investment-grade gold — including coins and bars of at least 90 per cent purity, minted after 1800, that are or have been legal tender — is exempt from VAT under the Value Added Tax (Investment Gold) Order 1999. So Sovereigns and Britannias have no VAT on purchase or sale. So do most gold bars used for investment. VAT is not the differentiator between coins and bars; CGT is.
Worked example
The same gold, different tax
Difference: £4,400
Numbers are illustrative. CGT rates and allowances change; check the current rates with HMRC or your accountant. Past prices are not a guide to future prices.
What could change
The CGT exemption is tied to legal-tender status. Removing it would require Parliament to either strip legal-tender status from Sovereigns and Britannias (politically and legally complex), or to amend Section 21 of TCGA 1992 to specifically tax currency that contains a commodity (precedent-setting and likely to capture other things too). Neither is impossible, but both are unlikely. The exemption has survived multiple Chancellors of varying tax appetites.
If you want the full position with our take on what could plausibly change, see the Tax in plain English page. If your situation is unusual (large estates, non-UK residency, business assets), get tax advice from a UK accountant. Nothing on this page is personal tax advice.