Same Gold, Different Packaging
A 1 oz cast gold bar and a 1 oz gold coin contain the same amount of gold. Both are investment-grade bullion. Both are GST-exempt in Australia. Both will hold their value relative to the gold spot price. The question is purely about how much you pay above spot and how easily you can sell when the time comes.
These two factors, premium and liquidity, point in opposite directions depending on the product. Understanding the trade-off will help you make the right choice for your investment goals and budget.
Compare current buy prices for bars and coins across all major Australian dealers on our comparison pages.
Premium: Bars Win on Cost
Cast gold bars carry the lowest premiums of any gold product in Australia. An ABC Bullion 1 oz cast bar typically carries a premium of 1.5 to 2.5% above spot. A 100g cast bar is often even lower on a per-gram basis. Larger bars (500g, 1 kg) can be bought at under 1% above spot from the right dealer.
Gold coins carry higher premiums, typically 3 to 6% for a standard 1 oz Perth Mint Kangaroo. The extra cost covers more sophisticated production: coin blanks are milled to precise tolerances, die-struck with detailed design work, quality-checked individually, and sealed in protective packaging.
On a A$6,600 purchase, the difference between a 2% bar premium and a 5% coin premium is A$198. That is real money, and it scales: on A$66,000 of gold, the premium difference is A$1,980.
For pure acquisition of gold at minimum cost, cast bars win every time. Compare gold bar premiums by size and dealer.
Liquidity: Coins Win on Recognisability
When it comes time to sell, the picture reverses. Coins, particularly the Perth Mint Kangaroo, are instantly recognised by every bullion dealer worldwide. Any dealer in Australia, Singapore, London, or New York will buy a 1 oz Kangaroo on sight, with no questions and no delay. Their weight and purity are guaranteed by the Perth Mint and verifiable from the coin's design alone.
Cast bars, while fully legitimate, require more trust. A buyer who does not know your specific dealer may want to verify weight and purity before accepting the bar. This is rarely a practical problem when selling to an established Australian dealer, but it can introduce friction in a private sale or in an overseas market.
The practical upshot: for buyers who may need to sell quickly, in unusual circumstances, or outside the established dealer network, coins offer a slightly broader and more liquid resale market.
Minted Bars: The Middle Ground
Between cast bars and coins sit minted bars: machine-pressed to precise dimensions, polished, assay-certified, and sealed in tamper-evident packaging.
Minted bars carry premiums of 2 to 4%, higher than cast bars but lower than coins. They have strong dealer recognisability, particularly for Perth Mint and PAMP Suisse branded products. They are attractive to buyers who want bar economics without the rough-finished look of a cast bar.
The trade-off against cast bars is purely cost: you pay 1 to 2% more per gram for the presentation and individual assay card. For many buyers, this is worth it. For investors purely focused on acquiring gold at minimum cost, cast bars remain the better choice.
Compare minted and cast gold bar premiums across dealers.
Storage: Bars Are More Compact
Gold coins in protective capsules take up more physical space per gram than cast or minted bars, particularly in smaller denominations. A collection of twenty 1 oz coins in individual capsules requires significantly more safe space than an equivalent weight of 100g bars in a stack.
For larger holdings, this matters. A 1 kg cast bar is approximately 116mm x 52mm x 8mm. Twenty 1 oz coins in capsules require a similar volume but irregular stacking.
For holdings above A$50,000, bars are meaningfully easier to store and handle. Below that level, the storage difference is minor.
Which to Buy: A Decision Framework
Buy cast bars if: you are accumulating as much gold as possible per dollar, you are buying in larger sizes (100g or above), you plan to sell to established dealers, and storage space is not a constraint.
Buy coins if: this is your first gold purchase and you want the most recognisable product, you may need to sell quickly or outside the established network, you are buying smaller denominations (1 oz or under), or the resale convenience of a universally accepted product matters to you.
Buy minted bars if: you want the cost advantage of bars with the presentation and recognisability of a branded product, and the 1 to 2% premium over cast bars is acceptable.
Most experienced Australian investors hold a mix of both. A common approach is to use cast bars for the bulk of accumulated holdings and keep a small number of Kangaroos for flexibility. Compare current prices on both before deciding.
Sources and Further Reading
Perth Mint, Gold Kangaroo coin specifications: perthmint.com/bullion
ABC Bullion, cast bar production and pricing: abcbullion.com.au
London Bullion Market Association, good delivery bar standards: lbma.org.uk
World Gold Council, physical gold forms and investment guide: gold.org
GoldSilverPrices.com.au: Live gold bar and coin comparison across all dealers
