Quick Answer
Offsetting liquidates a futures position with an equal and opposite trade in the same commodity, delivery month, and exchange. A long offsets by selling; a short offsets by buying back. When both the buyer and the seller close this way, the contract is extinguished and open interest falls. Most positions are offset before delivery.
Start here, because offsetting is how the large majority of futures positions are closed. The direction of the closing trade is the first thing to lock down, since flipping it describes opening a new position rather than closing an old one.
What Offsetting Means
Offsetting is the standard exit from a futures position, and it works by canceling the original trade with its mirror image.
- Offset (liquidation): closing an existing long or short futures position with an equal and opposite transaction in the same commodity, delivery month, and exchange. The two positions cancel and the trader is flat.
- Open position: a position stays open, and is marked to market every day, until the trader either offsets it or lets it run to settlement or delivery.
- The match must be exact: the offsetting trade has to line up on all three points (commodity, delivery month, exchange). A sell in a different delivery month is a new spread position, not an offset.
The Direction of the Offsetting Trade
This is the single most tested point in the section, and it is easy to get backwards under pressure.
- A long (bought the contract) offsets by selling an equal and opposite contract.
- A short (sold the contract) offsets by buying the contract back.
Think of it this way: closing a position is just undoing what you did to open it. If you got in by buying, you get out by selling; if you got in by selling, you get out by buying. The exit is always the reverse of the entry.
Exam Tip: Gotchas
- A long offsets by SELLING; a short offsets by BUYING back. A long does not "sell to close" by buying, and a short does not cover by selling. Flip the direction and you have described opening a brand-new position, not closing one.
Effect on Open Interest
Offsetting connects to open interest, a number the exam likes to test because it moves in three different ways depending on who is trading.
- Open interest: the total number of futures contracts, long or short, that have been entered into and not yet offset or fulfilled by delivery.
- Both parties close, so open interest falls: when a longtime long sells to a longtime short who is buying back, the contract is extinguished and open interest declines.
- One party passes to a new trader, so open interest is unchanged: if a closing trader offsets against a brand-new trader entering the market, the contract just changes hands and open interest stays the same.
- Two new traders open, so open interest rises: open interest increases only when a new buyer and a new seller both open a position.
| What happens | Effect on open interest |
|---|---|
| Existing long and existing short both offset | Falls |
| Existing trader offsets to a new trader entering | Unchanged |
| New buyer and new seller both open | Rises |
Exam Tip: Gotchas
- Open interest falls only when BOTH sides are closing. A single offsetting trade does not automatically shrink open interest. If the trader on the other side is opening a new position, the contract simply transfers and open interest holds steady.
Why Most Positions Are Offset
The vast majority of futures never reach the loading dock, and offsetting is the reason.
- Only a small minority go to delivery: most contracts are offset before the delivery process ever starts, because offsetting is faster, cheaper, and avoids handling the actual commodity.
- Speculators have no use for the physical: a trader betting on price direction wants the gain or loss in cash, not a truckload of grain, so closing out is the natural move.