1.25 oz Britannia Silver Coin

The Britannia at a Non-Standard Weight

The 1.25 oz Silver Britannia is an unusual denomination from The Royal Mint, falling outside the standard range of fractional and full-ounce sizes that dominate the Britannia bullion programme. At 38.88 grams of 999 fine silver, it contains 25% more metal than the standard 1 oz Britannia (31.10g), giving buyers a slightly larger position per coin while maintaining the series' established brand recognition and UK legal tender status.

As a Britannia-series coin with a sterling face value, this piece carries the same CGT exemption that makes the standard 1 oz Silver Britannia attractive to UK investors. Sterling legal tender coins are exempt from Capital Gains Tax regardless of denomination or weight, a benefit that few other silver coins can claim. For UK buyers accumulating silver with an eye to eventual disposal, the CGT exemption can outweigh the VAT paid on purchase, particularly for substantial gains.

The Royal Mint's decision to produce a 1.25 oz coin likely reflects experimentation with non-standard weights to differentiate its offering. The Royal Canadian Mint has pursued a similar strategy with its 1.25 oz Silver Bison programme, establishing 1.25 oz as a minor but recognised denomination in the silver market. The weight is practical: more silver per coin than a standard ounce, but not the price jump to a 2 oz piece.

The coin carries the Britannia reverse design and the four-feature security suite introduced in 2021 (latent image, surface animation, micro-text, and tincture lines), which apply across all Britannia denominations. These are visible to the naked eye by rotating the coin in light, providing authentication without specialist equipment.

1.25 oz Silver Britannia Technical Details

The 999 purity standard has been used for Silver Britannias since 2013. Earlier Britannias (1997-2012) used the historic Britannia silver standard of 958 fine, a unique alloy first mandated in England in 1697. The modern 999 standard aligns with international bullion coin norms and meets the 99.9% threshold required for IRA eligibility in the US, GST/IPM exemption in Australia and Singapore, and Canadian GST/HST exemption.

The four-feature security suite, introduced across all Britannia denominations from the 2021 issue, uses picosecond laser technology to create surface features that are extremely difficult to replicate. The latent image shifts between a padlock and trident when tilted; the surface animation creates wave-like movement behind Britannia; "DECUS ET TUTAMEN" micro-text encircles the design (readable only under magnification); and heraldic tincture lines on Britannia's shield use traditional hatching to represent colours in metal. This makes the Britannia the most visually secure silver bullion coin produced by any major mint.

The 1.25 oz weight at 999 fineness delivers 38.88 grams of pure silver per coin. At this weight, 20 coins provide 25 troy ounces of silver, matching the tube-to-ounce arithmetic of the Royal Canadian Mint's 1.25 oz Bison programme.

Britannia Silver Coin Tax Treatment

The Britannia's sterling legal tender status provides significant tax advantages in the UK that are unavailable for most competing silver coins.

• United Kingdom: Subject to 20% VAT on purchase (silver is not covered by the investment gold exemption). CGT-exempt on disposal as UK legal tender denominated in sterling. This is the Britannia's key differentiator: gains on sale are tax-free regardless of amount. For high-value positions or long holds where substantial gains accrue, the CGT exemption can more than offset the initial VAT cost. Also SIPP-eligible (gold only, but the CGT exemption applies to all metals).
• United States: IRA-eligible at 999 purity (meets the 99.9% silver threshold under IRS Section 408(m)). Must be held by an approved custodian. Capital gains taxed at 28% collectibles rate.
• Canada: GST/HST exempt (exceeds 99.9% purity threshold). Eligible for RRSP/TFSA through approved dealers.
• Australia: GST-free as investment-grade silver (99.9%+ purity). Subject to Australian CGT with 50% discount for 12+ month holdings.
• New Zealand: GST-exempt at 99.9%+ purity. No formal capital gains tax.
• Singapore: GST-exempt under the IPM scheme at 99.9%+ purity. No capital gains tax.
• European Union: Subject to local VAT rates (17-27%). Not covered by the EU Investment Gold Directive (that applies to gold only). Margin scheme available for pre-owned Britannias in Germany, Netherlands, and Spain.

1.25 oz Britannia vs Standard Weight Alternatives

The decision to buy at 1.25 oz rather than the standard 1 oz Britannia comes down to per-coin metal content versus market liquidity and premium efficiency.

The 1 oz Silver Britannia is the benchmark: highest liquidity, tightest bid-ask spreads, widest dealer acceptance, and identical CGT exemption. At 1 oz, the coin fits standard tubes (25 coins), integrates seamlessly with other 1 oz products for comparison and sale, and has the deepest secondary market. The 1.25 oz version sacrifices some of this standardisation in exchange for 25% more silver per piece.

Against the 2 oz Silver Britannia (where it exists), the 1.25 oz provides a middle step: more metal than 1 oz without the full price increase to 2 oz. For buyers on a fixed monthly budget, the 1.25 oz may allow more flexible allocation.

Compared to the 1.25 oz Royal Canadian Mint silver coin (such as the Silver Bison), the Britannia brings CGT exemption for UK buyers, the four-feature security suite, and The Royal Mint's brand. The RCM coin offers 9999 purity versus 999, and typically lower premiums due to higher production volumes at this weight. In a non-UK jurisdiction where CGT exemption is irrelevant, the RCM product may offer better value for money.