Coins or bars, and why the difference matters in the UK

The same metal in two shapes

Once you have decided you want to own physical gold, a second question turns up straight away. What shape should it come in?

Gold is sold to private buyers in two broad forms. There are bars, made by refiners, and there are coins, struck by national mints. A gram of pure gold in a bar and a gram of pure gold in a coin are chemically identical. The metal does not care which shape it has been pressed into.

Everything else about them differs. They are made by different institutions, for different reasons, in different sizes. They are checked in different ways, they are sold on to different people, and in the United Kingdom they are treated differently by the tax system.

None of that makes one format right and the other wrong. It does mean the choice is a real one, worth understanding before you make it rather than after. This lesson sets the two side by side and describes each of them plainly.

What a gold bar is

A bar is gold produced by a refinery and sold on its metal content. It carries no denomination and no nationality. It is simply a defined weight of gold at a stated purity, stamped with the name of whoever refined it.

Cast and minted

Bars are made in two ways, and the difference is visible at a glance.

A cast bar is made by pouring molten gold into a mould and letting it set. The result has a slightly rough, undulating surface and softened edges, and the markings are usually stamped into the metal after it has cooled. Cast bars are cheaper to produce, so they tend to appear in the larger sizes.

A minted bar is cut from a rolled strip of gold and then struck under pressure, in much the same way a coin is. The result has sharp square edges, a smooth flat face and crisp lettering. Minted bars are more expensive to make and are common in the smaller sizes.

Brand, serial number and assay card

Every reputable bar carries the mark of its refiner. That brand matters, because a bar tells you nothing about itself except what its maker has stamped on it. A buyer who does not recognise the refiner has no shortcut to trusting the metal.

Most bars also carry a serial number, unique to that bar, and arrive sealed in an assay card. An assay is a test of a metal's purity, and the card is the tamper-evident plastic packaging that holds the bar together with a certificate stating its weight, its fineness (the purity measure set out in the weights and fineness lesson) and the assayer's confirmation. Once the card is opened, the bar is loose. It is still gold, but it has lost the documentation that travelled with it, and a future buyer may want it re-tested before paying full price.

Good Delivery is a wholesale standard

You will see the phrase LBMA Good Delivery attached to bars. The London Bullion Market Association maintains a list of refiners whose large bars are accepted without question between banks and institutions in the London wholesale market. A Good Delivery gold bar is a very large one, in the region of 400 troy ounces, at a minimum fineness of 995 parts of gold per thousand.

This is worth being clear about, because the term is often borrowed loosely in retail listings. Good Delivery describes a wholesale bar and the wholesale chain of custody it sits inside. It is not a product a private buyer typically owns. What it does tell you, when a refiner appears on the LBMA list, is that the refiner is one whose output the professional market accepts.

What a bullion coin is

A bullion coin is gold that has been made into money.

It is struck by a national mint, the state institution that produces a country's coinage. It carries a design, a year of issue and, critically, a denomination: a value in that country's currency printed on the coin itself.

Legal tender is a status, not a price

Because it is issued by the state, a bullion coin is legal tender in its country of issue. Legal tender is a legal status. It means the coin is officially money, recognised by the law of the country that made it, rather than a manufactured object that happens to be valuable.

The status has a narrow practical meaning in day to day life. In the UK it concerns whether a payment offered in settlement of a debt must be accepted; it has never meant that any shop is obliged to take a gold coin across the counter. Nobody spends these coins. The status matters for a different reason entirely, and it is the reason to fix the idea in your mind now: several parts of UK law hang off the question of whether a coin is legal tender, and the Tax and the Markets lesson on Capital Gains Tax rests on it directly.

The face value is nominal

The denomination on a bullion coin is deliberately symbolic. A gold sovereign carries a face value of one pound. A one ounce gold Britannia carries a face value of one hundred pounds. In both cases the gold in the coin is worth many multiples of the number printed on it.

That gap is not an oddity or a trick. It is how the coins are designed. The face value exists to make the coin money in the eyes of the law. The value you actually buy and sell at is set by the metal, which follows the live spot price of gold, plus the premium the previous lesson set out.

The differences that show up in practice

Set against each other, the two formats diverge on four things you are likely to care about.

Unit size, and selling part of a holding

Coins come in small, standardised units. A sovereign holds a fraction of a troy ounce of gold, so a holding built from sovereigns is a stack of many small pieces rather than one large one. If you later need to release some of the value, you can sell a handful and keep the rest.

Bars are made in a much wider range of sizes, including some very small ones, but the economics favour the larger sizes, so the pull is always towards fewer, bigger units. A single large bar is an all or nothing decision on the way out. You cannot sell a corner of it.

Recognisability and verification

A widely issued coin has fixed, published specifications: a known diameter, thickness and weight, held to tight tolerances by the mint that struck it. Those constants make a coin comparatively quick to check, and a familiar design is recognisable to a great many people on sight.

A bar is verified through its documentation. Serial number, refiner brand and an intact assay card do the work that a coin's dimensions do. That is a perfectly sound system while the packaging is sealed and the refiner is one the market knows.

Who buys it from you

This is the question people tend to consider last, and it deserves more attention than that. Bars sell back into a dealer and refiner market that values them on metal content. Coins sell into that same market, and also into a broad UK audience of private buyers and collectors who want that particular coin. A wider pool of possible buyers is a practical advantage when you come to sell.

UK tax treatment

The two formats are not taxed the same way in the UK, and the reason traces directly back to legal tender status. Put at its simplest, UK legal tender gold coins are exempt from Capital Gains Tax for UK residents, and a gold bar is a chargeable asset in the ordinary way. That is the subject of the Tax and the Markets lesson on Capital Gains Tax and legal tender, which sets out the mechanism, the disposals it applies to and the caveats that go with it. Tax treatment depends on your individual circumstances and can change.

Where that leaves you

The honest summary is a trade-off rather than a verdict.

Bars are the most direct way to hold a quantity of gold. The larger the bar, the more efficiently it converts money into metal, and for someone buying a substantial amount in one go and intending to hold it whole, that efficiency is real. The price of it is a holding that moves in one piece and depends on its paperwork staying intact.

Coins usually carry a higher premium over the metal than a large bar does, for the reasons the previous lesson on premium set out. What you get in exchange is granularity, easier verification, a broader set of people who might buy them from you, and a legal status that UK law responds to.

Which matters more depends on the size of your holding, how long you expect to keep it, and whether you can imagine wanting to sell part of it rather than all of it. Those are your circumstances, and nobody can answer them from the outside.

What you should now be able to do is read a listing for either format and understand every word of it: cast or minted, the refiner, the serial, the assay card, the mint, the denomination, the legal tender status. That was the point of Understanding Gold, and the lessons that follow build on it.

Please note

Investing in gold is not regulated by the Financial Conduct Authority. There is no protection from the Financial Services Compensation Scheme and no access to the Financial Ombudsman Service. The value of gold can fall as well as rise. Nothing in this Academy is financial or tax advice. Tax treatment depends on your individual circumstances and can change.