Basis Trade at Index Close (BTIC) vs. TAS Explained

The basis is the agreed spread between an eligible futures contract and the specific cash or related index close named in that product's rules. At the point a BTIC transaction is matched, the basis can be known while the numerical closing reference is still unknown.

Once the applicable closing level is available, the exchange assigns the futures price as that level adjusted by the established basis. The transaction does not give either party control over how the index provider calculates its official close. It is a way to state the futures price relative to that later reference, not a bet that dictates where the index must print.

Futures basis and fair value explains why a futures-versus-index difference can reflect factors such as financing, expected dividends, and time remaining. A BTIC basis is a contract-specific pricing relationship, not a claim that fair value has been proven or that the basis will disappear.

BTIC refers to the closing level of an eligible futures contract's underlying cash index or a related index specified in the applicable product chapter. TAS refers to the current day's not-yet-known futures settlement price or an allowed differential to it. Both can use a reference that is unknown at entry, but the two references are not interchangeable.

That difference matters when comparing a confirmation, a benchmark, or a later P&L entry. An official cash-index close, an exchange's daily futures settlement, and the last displayed futures trade can all be different values created by different processes.

Trading at Settlement covers a settlement-referenced eligible order. Futures settlement price versus last trade separates an official settlement from a recent execution. Neither page turns BTIC into a general-purpose at-close order.

CME Rule 524 says an assigned BTIC futures price is final when determined by the exchange, subject to a specified correction path if the relevant index provider corrects its closing level before 4:00 p.m. Central Time on the following business day. The same rule directs readers to product chapters for details such as the applicable index closing times and disruption provisions.

This is why a generic screen label or a familiar equity-index example is not enough. Product and contract-month eligibility, the permitted trading window, the named reference, admissible basis increments, the order route, and broker support can differ. Rule 524 also notes that a BTIC transaction may result in an assigned futures price outside applicable daily price limits; do not infer the assigned outcome from an ordinary outright price-limit check.

Record the contract month, trade date, basis, referenced index, stated close date, quantity, exchange confirmation, and broker record. If a reference value is revised or a disruption procedure applies, the contract-specific material controls the resulting account entry.

BTIC determines an eligible entry relationship. It does not purchase the cash index, eliminate price movement after entry, remove daily margin, or guarantee a later exit. Once the futures transaction is assigned, the position follows that contract's multiplier, liquidity, mark-to-market, margin, and expiry mechanics.

Futures hedge ratio and basis risk shows why a relationship to a benchmark does not erase mismatch risk. Before using any actual BTIC workflow, confirm the exact product's current specifications and the broker's instructions rather than transferring rules from BTIC+, TAS, or another contract.

This is a market-mechanics guide, not an instruction to enter BTIC or TAS. Exchange rules and broker procedures govern an actual transaction.