Sovereigns versus Britannias
The two most popular UK gold coins compared on gold content, premium, divisibility and practical resale — and how to decide which suits what you are actually trying to do.
8 min read · Updated
Contains tax information
The short answer
Britannias are usually the cheaper way to buy a given quantity of gold. Sovereigns are more divisible and have a deeper secondary market. Both are Royal Mint products and both are UK legal tender.
If you are buying several thousand pounds of gold in one go and do not expect to sell in small pieces, Britannias generally win on cost. If you want the option to sell a few hundred pounds at a time, Sovereigns are more practical.
The physical difference
The two coins are built differently, and it matters more than it first appears.
| Full Sovereign | 1 oz Britannia | |
|---|---|---|
| Fine gold | 0.2354 oz (7.32 g) | 1 oz (31.10 g) |
| Gross weight | 7.99 g | 31.21 g |
| Fineness | 916.7 (22 carat) | 999.9 (24 carat) |
| Diameter | 22.05 mm | 32.69 mm |
Purity is not quality
A Sovereign is 22 carat and a Britannia is 24 carat, but this is not a statement about which is better. The Sovereign is alloyed with copper, which makes it considerably harder and more resistant to marking — a practical advantage for a coin designed to circulate.
A 24 carat Britannia is softer and shows handling marks more readily. Since condition affects what a dealer will pay on the secondary market, the Britannia’s higher purity comes with a handling requirement the Sovereign does not have.
Crucially, the alloy does not reduce the gold you own. A Sovereign contains 7.32 g of fine gold whatever else is in it — which is why every calculation on this site uses fine weight, never gross weight.
Divisibility: the real trade-off
A Sovereign is roughly a quarter-ounce of gold. That makes it a much smaller unit of sale, which matters if you ever need to realise part of a holding.
Selling one Britannia means selling a full ounce. Selling one Sovereign means selling about a quarter of that. If you want to raise a smaller amount, the Sovereign lets you do it without liquidating a large position.
The cost of that flexibility is premium: you will pay more per gram for Sovereigns than for Britannias.
Tax treatment
Both are UK legal tender, and certain UK legal-tender coins may be exempt from UK Capital Gains Tax on disposal. Both also generally meet the conditions for investment gold, which may be exempt from VAT.
Treatment is not automatic and not identical in every case. It depends on current rules, on the specific coin, and on your own circumstances — very old Sovereigns, for instance, are not in the same position as modern ones.
Not tax advice
Choosing
In practice the decision usually comes down to three questions.
- Are you optimising purely for gold per pound? Britannias, or a mixed-year Britannia if you do not need a specific date.
- Do you want to be able to sell in smaller amounts? Sovereigns, and accept the higher premium as the price of that option.
- Are you buying a large amount at once and storing it? Compare 1 oz coins against 1 oz bars as well — bars are usually cheaper still, though they are not UK legal tender and so do not carry the same CGT position.