Rolling futures contracts means closing a position in an expiring contract month and opening the same position in a later month at the same time, usually through a single calendar spread order. You do it because every futures contract has a fixed expiration, and if you want to keep your exposure to crude oil, Treasury bonds, the S&P 500, or any other market, you have to move the position forward before the current month runs out. The roll is not free. It produces a gain or loss based on the price difference between the two months, it can change your margin requirement, and it triggers a taxable event under a specific set of IRS rules.
Why the Roll Exists
Stocks can be held indefinitely. Futures cannot. Each contract specifies a delivery or settlement month, and at that point you either settle or let it expire. A trader who wants continuing exposure has to shift into the next active month.
How expiration works depends on the contract type. Physically settled contracts, such as crude oil, grain, and metals, require the actual commodity to change hands. Cash-settled contracts, like the E-mini S&P 500, pay out the difference between your entry price and the final settlement price. Both need rolling if you want to stay in the market, but the stakes differ. With a cash-settled contract you cannot accidentally end up owning 1,000 barrels of oil. With a physically settled one, you can.
The Two Deadlines That Drive the Roll
For physically settled contracts, two dates control the timeline.
First Notice Day is the earliest date the exchange’s clearinghouse can assign a delivery notice to a long position holder. A short can notify the clearinghouse of its intent to deliver, and the clearinghouse assigns that delivery to the oldest outstanding long.1CME Group. Learn About the Treasuries Delivery Process If you are long and do not want 5,000 bushels of corn assigned to a warehouse in your name, you need to be out of the contract before this day.
Last Trading Day is the final session when the expiring contract still trades. After that, any remaining open positions go to settlement.2CME Group. Get to Know Futures Expiration and Settlement First Notice Day often falls several weeks before Last Trading Day, and liquidity in the expiring month tends to drain during that window as traders migrate forward. Most of the actual rolling happens inside that window.
Cash-settled contracts have no First Notice Day since there is nothing to deliver. You still need to roll before Last Trading Day to keep the position, but there is no delivery risk hanging over you.
How to Place the Trade
The mechanics are simple once you know the shortcut. Rather than placing two separate orders, you trade a calendar spread: a single order that closes the expiring leg and opens the new one at the same time. A long position sells the near month and buys the deferred month. A short does the reverse: buy back the near month, sell the far month.
The spread order is priced on the difference between the two months, not on the outright price of either. That structure matters. If you closed the near month first and the market moved before you could open the far month, you would eat the gap. Executing both legs together eliminates that slippage. Most brokers offer dedicated spread order types, and commissions on spreads tend to run lower than on two standalone trades.
When to Roll
The right moment to roll is when both contract months have enough volume to give you clean fills. As expiration nears, open interest drains from the expiring contract and builds in the next. The overlap where both months trade actively is the ideal window.
Some products publish their roll dates. For CME Group equity index futures, the roll date is the Monday before the third Friday of the expiration month. In 2026 that lands on March 16, June 15, September 14, and December 14 for U.S. index contracts.3CME Group. Equity Index Roll Dates Commodity index products follow their own calendars. Funds tracking the S&P GSCI, for instance, roll between the 5th and 9th business day of the month, shifting weight from the expiring contract to the new one over five sessions.4S&P Global. S&P GSCI Methodology Large index funds rolling on predictable schedules can push spread prices around temporarily, and experienced traders watch those windows.
Rolling too early means trading into a deferred month that still has thin volume, wider bid-ask spreads, and higher costs. Rolling too late means holding a position with evaporating liquidity, and for physically settled contracts, potentially triggering delivery. Most retail brokers will force-close your position before First Notice Day if you have not moved it yourself. That liquidation happens at whatever price is available in the moment, which is rarely the price you would have chosen.
Watch the Margin on the Back Month
Margin requirements often differ between contract months. Back-month contracts frequently carry higher margin than the front month because exchanges factor in thinner liquidity and higher potential volatility. Whether the exchange uses SPAN or a VaR-based model, the risk parameters assigned to each expiry are not identical.
Rolling early can amplify this. If you push into a deferred month before the exchange has reclassified it as the new front month, you may be paying the higher back-month margin on the whole position. That can temporarily tie up more capital than you expected. Check the margin requirement on the target month before you place the spread, especially if the position is large or your account is tight.
What the Roll Costs or Pays: Contango and Backwardation
The financial result of the roll depends entirely on the price relationship between the near and deferred months.
Contango
When the deferred month trades higher than the expiring one, the market is in contango. This is the default in many commodity markets because the deferred price bakes in the cost of storing, insuring, and financing the physical commodity until the later date. Higher interest rates and expensive storage widen the gap.
For a long position, contango is a cost. You are selling the cheaper near month and buying the more expensive far month, and that difference is negative roll yield. Over multiple cycles the cost compounds and can erode returns even when the spot price is moving your way. A trader planning to hold long exposure for months or years has to budget for this drag.
Backwardation
Backwardation is the reverse: the near month trades higher than the deferred. This tends to show up when immediate demand is strong, often from a supply disruption or seasonal tightness, while the forward curve reflects expectations that the shortage will ease.
A long position gains here. Selling the higher-priced near month and buying the cheaper far month produces positive roll yield. A short position gets hurt by the same math running the other way.
Why Commodity ETFs Bleed in Contango
Roll yield is the main reason many commodity ETFs underperform the spot price of what they track. These funds hold futures, not physical commodities, and they roll every month or quarter. In persistent contango, the fund is effectively selling low and buying high on every roll. The United States Oil Fund (USO) lost roughly 14.6% annualized over the decade ending January 2022 even during periods when oil prices were rising. The ProShares VIX Short-Term Futures ETF (VIXY) lost roughly 50% annualized over the same period, almost entirely because of steep contango in VIX futures. If you are looking at a commodity ETF as a long-term holding, the roll yield environment matters more than your view on the spot price.
Tax Treatment When You Roll
Rolling creates a taxable event. Closing the near-month leg realizes a gain or loss on that contract even though you reopen the position in the next month a second later. The IRS treats the close as a complete disposition. There is no way to defer the tax by arguing you kept the same position.
Most regulated futures contracts traded on U.S. exchanges are Section 1256 contracts, and the rules that apply are meaningfully different from those governing stocks and bonds.5Office of the Law Revision Counsel. 26 U.S.C. 1256 – Section 1256 Contracts Marked to Market
Mark-to-Market and the 60/40 Split
Any Section 1256 contract still open on December 31 is treated as if you sold it at fair market value that day. The resulting gain or loss counts for that tax year regardless of whether you actually closed anything. This prevents traders from deferring gains by keeping positions open across the calendar boundary.5Office of the Law Revision Counsel. 26 U.S.C. 1256 – Section 1256 Contracts Marked to Market
All gains and losses on Section 1256 contracts get a blended rate: 60% long-term capital gain or loss and 40% short-term, regardless of how long you held the contract.5Office of the Law Revision Counsel. 26 U.S.C. 1256 – Section 1256 Contracts Marked to Market Because long-term rates are lower than short-term rates for most taxpayers, this hands futures traders a real advantage over equity traders, who need a holding period over a year to qualify for long-term treatment. All of it gets reported on IRS Form 6781.6Internal Revenue Service. About Form 6781, Gains and Losses From Section 1256 Contracts and Straddles
Wash Sales Do Not Apply
The wash sale rule that blocks stock traders from claiming a loss when they repurchase a substantially identical security within 30 days does not apply to Section 1256 contracts.7Internal Revenue Service. IRS Form 6781 – Gains and Losses From Section 1256 Contracts and Straddles You can roll a losing futures position into the next month and claim the full loss on the closed contract. For active traders who roll often, that is a real benefit. No 30-day waiting period, no disallowed losses.
Three-Year Loss Carryback
If you end the year with a net loss on Section 1256 contracts, you can carry that loss back up to three years and apply it against Section 1256 gains from those earlier years. The carryback election lets you amend prior returns and claim a refund.8Office of the Law Revision Counsel. 26 U.S.C. 1212 – Capital Loss Carrybacks and Carryovers It applies only to the Section 1256 portion of your losses, and it can only offset prior Section 1256 gains, but in a bad year it can pull cash back from years that went well.
Currency Futures
Foreign currency transactions normally fall under Section 988, which treats gains and losses as ordinary income. Regulated foreign currency futures traded on exchanges like the CME are carved out of Section 988 and taxed under Section 1256 instead.9Office of the Law Revision Counsel. 26 U.S.C. 988 – Treatment of Certain Foreign Currency Transactions The 60/40 split typically produces a lower bill than ordinary income treatment. Spot forex generally stays under Section 988; regulated currency futures do not.
If You Skip the Roll
For physically settled contracts, missing the deadline can leave you responsible for taking or making delivery of the actual commodity. In practice your broker will almost certainly force-close the position before that happens, but if you are trading through a broker that permits delivery, the logistics are expensive.
When delivery occurs, the clearinghouse transfers a warehouse receipt for a specific quantity and grade of the commodity at a designated location. A buyer pays storage at the exchange-approved warehouse for as long as the commodity sits there, plus any transportation to move it. For a retail speculator, those costs typically swamp any trading profit the position produced. Rolling on time is how you avoid ever being in that position.