Settlement step in which a to-be-announced agency MBS trade is completed with eligible mortgage pools.
TBA settlement is the completion of a forward agency MBS trade through delivery of securities backed by eligible mortgage pools that satisfy the agreed trade terms.
TBA settlement matters because the TBA market lets agency MBS trades be agreed using standardized characteristics before the exact pools are identified. The trade specifies features such as agency or program, product, coupon, settlement month, price, and amount; qualifying pools are allocated later.
Settlement is where the seller must deliver securities that meet the applicable good-delivery requirements and the buyer must complete the agreed payment. Standardized practices make a broad forward market possible even though the underlying pools contain many individual mortgages.
Lender rate-lock and delivery teams may manage expected mortgage production against this market. The borrower sees a rate lock and closing process; the lender separately manages whether closed loans can support expected secondary-market execution.
Borrowers almost never see TBA settlement directly. It happens in the background after loans close or as lenders manage their locked pipeline against delivery expectations.
The term becomes practical when explaining why mortgage pricing, lock management, and loan delivery are tied to a large forward market rather than only to the lender’s balance sheet. An individual mortgage does not settle as a TBA trade; the securities position does.
| Step | What happens | Main control | | — | — | | Trade confirmation | Parties confirm standardized economic terms | Agency/program, product, coupon, amount, price, and settlement date agree | | Pool allocation | Seller identifies securities intended for delivery | Pools must fit the trade and market-practice requirements | | Delivery review | Pool information and securities are checked | Good-delivery standards and operational deadlines apply | | Settlement | Securities and funds are exchanged | Delivered amount and payment complete the trade | | Difference resolution | Shortages, substitutions, pair-offs, or other differences are handled | Parties follow governing agreements and market practices |
A pool can be eligible collateral for agency MBS without being acceptable for every TBA trade. The delivered security must match the specific trade terms and applicable settlement standards.
A lender or securities dealer agrees to deliver $10 million of a specified agency, product, and coupon for the next settlement month. The exact pool numbers are not fixed on the trade date.
Before settlement, the seller allocates qualifying pools and provides the required pool information. On settlement, acceptable securities are delivered and funds are exchanged. If the seller instead offsets the position, that resolution is a pair-off rather than delivery settlement.
TBA settlement differs from the To-Be-Announced Market because the market is the trading channel, while settlement is the completion step for a trade.
It differs from Specified Pool because specified pool is the identified pool, while settlement is the transaction step that uses eligible pools to complete the trade.
It also differs from TBA Pair-Off because settlement completes the position with delivery, while a pair-off offsets a position instead of delivering the expected security.