Cost of carry is the financing and holding economics that connect an asset’s spot price with its theoretical forward or futures price over a given horizon. The phrase does not have one universal accounting sign. In some futures terminology, it refers to the carrying charges incurred to own an asset, such as financing, storage and insurance. In other market practice, “carry” is quoted net of income or other benefits. The common principle is to compare the economics of owning the asset now with obtaining equivalent exposure for future delivery.
What is actually being carried?
For a storable physical commodity, ownership can require financing, storage, insurance and other inventory-related expenses. Physical inventory can also provide a convenience yield: the economic benefit of having the commodity available when it is needed. In a simplified representation, the theoretical deferred price reflects financing and storage costs offset by such holding benefits. A sufficiently high convenience yield can therefore outweigh carrying expenses and contribute to backwardation. Convenience yield is not itself another name for cost of carry; it is a distinct holding benefit that can offset costs in a net-carry framework.
Financial assets replace warehouse economics with different cash flows. For an equity index, financing the underlying shares pushes fair value upward while expected dividends work in the opposite direction. In FX, the relevant carry relationship comes from the interest rates of the two currencies, with the result also depending on the quotation convention. For Treasury securities, practitioners may compare coupon income with repo or other financing expense. The same no-arbitrage logic therefore survives across markets even though the inputs do not.
Why “positive carry” can mean the opposite of a positive cost
Sign convention is the practical trap. A cost-of-carry calculation may record financing and storage expenses as positive costs, so a larger net cost raises theoretical deferred value. Yet Treasury-futures practice commonly defines carry as coupon income minus financing cost, making positive carry a net holding benefit. Equity-index and FX materials likewise often describe positive carry in terms of income earned relative to financing. A carry figure is therefore incomplete information unless its components and sign convention are known.
Cost of carry is also distinct from roll yield. Cost of carry concerns the economics linking spot and deferred value at a given time; roll yield concerns the return effect associated with a futures position as contracts age and, where applicable, are replaced. Carry can help explain the shape of a futures curve, but the observed curve can also reflect convenience yield, inventory conditions and market frictions. It should not be read mechanically as a forecast of future spot prices or as evidence that one particular carry component caused the spread.