1/20 oz Britannia Gold Coin

The Smallest Britannia: Maximum Tax Efficiency at Minimum Outlay

The 1/20 oz Britannia is the smallest gold coin in The Royal Mint's flagship bullion range. At just 1.555 grams of .9999 fine gold and a diameter of 12mm, it is barely larger than a shirt button, yet it carries the same full UK legal tender status (face value GBP 5) and the same CGT exemption as the 1 oz Britannia that costs twenty times as much.

That legal tender status is the 1/20 oz Britannia's defining feature. It is one of only a handful of coins at this tiny denomination that provides complete exemption from UK Capital Gains Tax. The 1/20 oz Kangaroo and 1/20 oz Maple Leaf are both .9999 gold from sovereign mints, but neither carries UK CGT exemption. For a UK buyer making their first gold purchase or looking for a gift with genuine investment merit, the 1/20 oz Britannia is the natural choice.

The trade-off is premiums. At the 1/20 oz weight, manufacturing costs are nearly the same as for a full-ounce coin but spread across just 1.555 grams of gold. Premiums typically run 15-25% over spot, meaning buyers pay substantially more per gram than they would for larger denominations. Accumulating an ounce of gold through twenty 1/20 oz coins would cost significantly more than buying a single 1 oz Britannia. For wealth building, larger sizes are more cost-effective; the 1/20 oz serves gifting, collecting, and budget-constrained entry into CGT-free gold.

From 2021 onwards, the Britannia series carries the Royal Mint's four-feature anti-counterfeiting suite: latent image, surface animation, micro-text, and tincture lines. These features apply across all denominations, including the 1/20 oz.

1/20 oz Britannia Gold Coin Specifications

Britannia Denominations

The full Britannia gold range spans six sizes:

Security Features (2021 onwards)

• Latent image: Padlock-to-trident shift depending on viewing angle.
• Surface animation: Wave pattern behind Britannia that moves as the coin is tilted, created using picosecond lasers at submicron scale.
• Micro-text: "DECUS ET TUTAMEN" (an ornament and a safeguard) encircling Britannia, visible under magnification.
• Tincture lines: Heraldic pattern on Britannia's shield depicting colours through line patterns.

1/20 oz Britannia Tax Treatment by Country

United Kingdom

The 1/20 oz Britannia carries the UK's most favourable bullion tax treatment. It is VAT-free on purchase (investment gold) and fully exempt from Capital Gains Tax on disposal. As UK legal tender denominated in sterling, it is not a chargeable asset for CGT purposes, regardless of the gain. This exemption applies to all Britannia denominations from 1/20 oz to 5 oz. For buyers with gains exceeding the GBP 3,000 annual CGT allowance, the exemption has real monetary value.

Gold Britannias are also SIPP-eligible. Gold held within a Self-Invested Personal Pension qualifies for income tax relief at the marginal rate (up to 45%) and is exempt from CGT within the pension wrapper.

United States

IRA-eligible. The .9999 purity exceeds the IRS minimum of .995 for gold. Note that pre-2013 Britannias (.917 fine, 22 carat) do not meet IRA purity requirements. Capital gains taxed at the collectibles rate (up to 28%). State sales tax varies.

European Union

VAT-exempt under the investment gold directive. German investors pay no capital gains tax on gold held for more than one year.

Canada

GST/HST exempt (99.5%+ purity). Capital gains at the 50% inclusion rate. Eligible for RRSP through approved dealers in allocated storage.

Australia and New Zealand

GST-free in Australia (investment-grade gold of 99.5%+ purity). GST-exempt in New Zealand (same threshold). Australian CGT applies with a 50% discount for holdings over 12 months.

Singapore and Hong Kong

No GST on investment precious metals in Singapore. No sales tax or capital gains tax in Hong Kong.

1/20 oz Britannia vs Other Micro-Fractional Gold Coins

The 1/20 oz gold coin market is small. Most major mints stop at 1/10 oz as their smallest denomination; only a few produce 1/20 oz coins. The primary competitors are the 1/20 oz Canadian Maple Leaf, the 1/20 oz Perth Kangaroo, and the 1/20 oz Mexican Libertad. The American Gold Eagle does not come in 1/20 oz; the US Mint's smallest Gold Eagle is the 1/10 oz.

The 1/20 oz Maple Leaf is the most widely available coin at this weight, with .9999 purity and the same Bullion DNA security features as its larger siblings. It is the practical default for non-UK buyers. The Britannia matches it on purity and beats it on UK tax treatment (CGT-exempt vs CGT-liable). The Maple Leaf has better liquidity in North American markets.

The 1/20 oz Kangaroo, also .9999, adds annually changing reverse designs and Perth Mint provenance. It trades at comparable premiums to the Britannia and Maple Leaf. The Libertad, at .999 purity (three nines rather than four), is produced in very limited quantities and carries the highest premiums of the group, driven by collector demand and scarcity rather than metal value.

At the 1/20 oz size, premiums are the dominant consideration. All four coins contain the same 1.555 grams of gold, and the premium paid at purchase is largely not recoverable on resale. The Britannia's CGT exemption for UK buyers is the only structural advantage that persists beyond the initial purchase. For buyers in other markets, the choice at this weight is largely a matter of mint preference and local availability.