Exchange traded commodities, or ETCs, are debt securities that trade on stock exchanges and track the price of a single commodity (like gold or crude oil) or a basket of them. You buy them through an ordinary brokerage account, and their value rises and falls with the underlying raw material rather than with any company’s earnings. Investors generally use them to hedge against inflation or to add a slice of resource exposure to a portfolio built on stocks and bonds.
What an ETC Is and How It Differs from an ETF
An ETC follows the price of a commodity, either the spot price (what the commodity costs right now for immediate delivery) or a futures contract (an agreement to buy or sell at a set price on a future date). The usual underliers are precious metals such as gold, silver, and platinum, energy products like crude oil and natural gas, and agricultural goods like soybeans and corn.
The name is almost identical to “ETF,” but the legal structure is not. An exchange traded fund is an investment fund: it pools investor money, holds a basket of assets, and issues shares in that pool. US ETFs that hold stocks or bonds are regulated under the Investment Company Act of 1940.1eCFR. 17 CFR Part 270 – Rules and Regulations, Investment Company Act of 1940 An ETC is instead a note (typically a non-interest-bearing secured note) issued by a special purpose vehicle created solely to hold the backing assets and issue the notes.2SEC. ETC Trust Indenture Filing You hold a debt obligation whose payoff is contractually tied to the commodity’s price, not a share of a fund.
The practical consequence: a debt structure lets an ETC track a single commodity directly, which the diversification rules of the Investment Company Act make awkward for a traditional fund. The tradeoff is that you take on some exposure to the issuer. The special purpose vehicle is deliberately isolated from the sponsor’s balance sheet, and a third-party trustee holds the collateral so the issuer cannot freely draw on it. If the issuer fails, the trustee liquidates that collateral to pay note holders.
How the Note Is Backed
ETCs come in two flavors, and the difference changes both what you own and what can go wrong.
Physically Backed
A physically backed ETC holds the actual commodity in regulated storage. A gold ETC, for example, holds bullion bars in professional vaults. Those bars typically meet London Good Delivery standards: minimum fineness of 995.0 parts per thousand and a weight between 350 and 430 fine troy ounces per bar.3LBMA. Technical Specifications The issuer publishes a daily “metal entitlement” showing how much commodity each note represents. That entitlement shrinks slightly over time as fees are deducted.
Physical backing works well for non-perishable, high-value-per-unit commodities (gold, silver, platinum). It does not work for natural gas, livestock, or soybeans, where storage is expensive or impossible at scale.
Synthetically Backed
A synthetic ETC holds no commodity. The issuer enters a swap agreement with a major financial institution: the counterparty pays the return of the commodity’s price movement, and the issuer holds a pool of collateral (typically government bonds or cash) against the swap. This is the standard structure for commodities you cannot practically warehouse, such as natural gas and perishable agricultural products.
Counterparty Risk with Synthetic ETCs
With a physically backed ETC, the risk is simple: the commodity’s price can fall, but the metal is in the vault. With a synthetic ETC, your return depends on a financial institution honoring a contract. If that counterparty defaults, the swap can lose value no matter where the commodity trades.
Issuers manage this by requiring the counterparty to post collateral and by using central clearing where possible. The posted collateral may not perfectly match the commodity’s value at every moment, though, and in a crisis the mismatch can widen. If two ETCs track the same commodity and one is physically backed, the physical version carries less structural risk, all else equal.
How You Buy and Sell an ETC
ETCs are listed on major stock exchanges and trade through the normal business day. Each one has a ticker symbol and an International Securities Identification Number (ISIN).4London Stock Exchange. ETCs and ETNs You buy and sell them through a standard brokerage account, just like a share of stock, and you see the price update in real time.
Market makers post continuous buy and sell quotes to provide liquidity. In heavily traded products like gold ETCs, the bid-ask spread (the gap between the buy and sell price) is tight. In thinner products the spread widens, and a wider spread raises your round-trip cost. Products tracking less liquid commodities can also show price gaps of 1% or more from net asset value, which is a hidden cost on top of any listed fees. Behind the scenes, large institutional firms called authorized participants arbitrage the market price back toward the commodity’s value by creating new units when the ETC trades at a premium and redeeming units when it trades at a discount.
What It Costs to Own
The headline figure is the expense ratio, which pays for management, administration, custody, and legal services. Commodity ETCs typically fall between 0.20% and 0.95% per year, depending on the commodity and whether backing is physical or synthetic. The fee is deducted daily from the value of the note, so you won’t see a line item on your brokerage statement; over time it reduces how much commodity each note represents.
Expense ratio is not the full cost. You also pay any brokerage commission, the bid-ask spread each time you trade, and any premium or discount to net asset value at the moment of the trade. For physically backed products, vault storage and insurance are already inside the expense ratio. For synthetic products, the cost of running the swap is embedded. Comparing two ETCs on headline fee alone can mislead if one consistently trades at a wider spread or a persistent discount to its underlying value.
The Roll Yield Trap in Futures-Based ETCs
This is where futures-based ETCs regularly surprise investors. If the ETC tracks futures rather than holding the physical commodity, it must periodically roll contracts: sell the expiring one and buy the next. The price gap between those two contracts is the roll yield, and it can cut either way.
When the futures market is in contango (later-dated contracts cost more than nearer-dated ones), the ETC sells low and buys high at every roll. That is a loss, even if the spot price of the commodity has not moved. A 1% monthly roll cost compounds to roughly 13% annualized, enough to swallow gains in the spot price entirely.5Fidelity. Commodity ETFs: A Guide to Contango and Backwardation Energy markets, particularly oil and natural gas, spend long stretches in contango, which is why many futures-based energy ETCs sharply underperform the spot commodity over holding periods of a year or more.
The opposite shape, backwardation, has later-dated contracts cheaper than nearer-dated ones. The roll then works for you: sell high, buy low, with a positive contribution to return on top of any spot price movement. Backwardation shows up in some agricultural and metals markets, but it is never guaranteed. If you plan to hold a futures-based ETC for more than a few weeks, look at the shape of the futures curve for that commodity first. A physically backed ETC avoids the roll problem entirely because there are no contracts to roll.
How ETCs Are Taxed
Tax treatment depends on what the ETC holds and how it is legally structured. Getting this wrong can produce an unwelcome surprise in April.
Physically Backed Precious Metal ETCs
The IRS treats gold, silver, and other precious metals as collectibles. If you hold a physically backed precious metal ETC for more than a year and sell at a profit, your long-term gain is taxed at a maximum federal rate of 28%, not the 15% or 20% rate that applies to most stocks.6Internal Revenue Service. Topic No. 409, Capital Gains and Losses The higher rate is set under 26 U.S.C. ยง 1(h), which defines “28-percent rate gain” to include collectibles gain.7Office of the Law Revision Counsel. 26 US Code 1 – Tax Imposed Short-term gains (one year or less) are taxed as ordinary income.
Futures-Based ETCs
ETCs that hold regulated futures contracts fall under Section 1256 of the Internal Revenue Code. Gains and losses are split automatically 60% long-term and 40% short-term, regardless of how long you actually held the position.8Office of the Law Revision Counsel. 26 US Code 1256 – Section 1256 Contracts Marked to Market The contracts are also marked to market at year-end: any unrealized gain or loss on December 31 is treated as if you had sold and repurchased, so you can owe tax on paper gains.
Futures-based commodity products structured as partnerships issue a Schedule K-1 rather than a Form 1099, which complicates and can delay your filing. ETCs structured as debt notes are generally treated as prepaid forward contracts, meaning you recognize gain or loss only when you sell, redeem, or the note matures. Check the prospectus before you buy to confirm which tax reporting you will receive.
State Tax
State treatment varies. Some states follow the federal collectibles rate; others tax all capital gains as ordinary income. Check your state’s rules, or consult a tax professional, before taking a large position.
Tracking the Underlying Price
Each ETC has a net asset value calculated daily, equal to the current market value of the backing assets minus accrued expenses. Physically backed products publish an exact metal entitlement so you know how much of the resource each note represents. Tracking accuracy is measured against a benchmark, either a spot price or a futures index, and in a well-run product in a liquid market, deviations rarely exceed the expense ratio plus typical trading spreads. In an illiquid commodity, or during market stress when authorized participants pull back from arbitrage, the ETC’s market price can drift meaningfully from its benchmark. That drift is a real cost even when it does not appear on any fee schedule.