Published 30 January 2026
A note before we start
UK legal-tender gold coins are CGT-exempt
Post-1837 gold Sovereigns and gold Britannias are UK legal tender and therefore not chargeable assets for Capital Gains Tax. Any gain on selling them is, broadly speaking, outside CGT, regardless of the amount. This is a meaningful planning point for those holding bullion coins.
The chattel exemption
For most physical personal possessions, including non-legal-tender gold coins, jewellery, watches and bullion bars, a £6,000 chattel exemption applies. If you dispose of a single item for £6,000 or less, the gain is generally exempt. Above that threshold, marginal-relief rules can reduce the chargeable gain.
The annual CGT allowance
Even where a gain is chargeable, an annual exempt amount applies (the threshold is set by Government each year and has been reducing in recent years). Gains below the allowance for the year are not taxed; gains above it are. Check the current figure on the HMRC website.
Sets of items and "associated" disposals
There are anti-avoidance rules to prevent splitting a single set across multiple disposals to use the chattel exemption repeatedly. If you are selling matching pieces (such as a flatware set) that would normally trade as a unit, the chattel exemption may apply to the set as a whole rather than each piece. This is exactly the kind of nuance worth running past a tax adviser if values are material.
Record-keeping
Keep the documentation: the original cost where you have it, the date of acquisition (for inherited items, the probate value), the sale proceeds, and our written, itemised offer breakdown. If a future return is needed, those records are what you will rely on.
Common questions
Are Sovereigns and Britannias really tax-free to sell?
They are exempt from Capital Gains Tax because they are UK legal tender. Income Tax could still apply in business or trading contexts. For a household sale of personally held coins, gains are generally outside CGT.
Do I have to declare a gold sale to HMRC?
If the sale produces a chargeable gain above the annual allowance or otherwise requires reporting under HMRC's rules, then yes. For exempt or below-threshold sales, no separate return is generally required.
Is this article tax advice?
No. It is general information. For a position specific to your circumstances, consult HMRC guidance or a qualified tax adviser.