Treasury Reopening vs. New Issue: CUSIP, Price, and Accrued Interest

Treasury uses a reopening when it auctions an additional amount of a security that already exists. For a nominal fixed-rate note or bond, the added securities have the same CUSIP, maturity date, and interest rate as the earlier issue. They are therefore part of the same fungible issue in the market, rather than a second bond with a fresh CUSIP. TreasuryDirect’s reopening schedule describes the additional sale and the terms that remain the same. A new issue starts a different security. It normally has a new CUSIP, its own original issue date, and a maturity selected for that offering. A similar label such as “10-year note” does not make two notes identical: compare their CUSIPs, coupons, maturity dates, and cash-flow calendars. For auction fields and bidder categories, see how to read Treasury auction results.

The reopening keeps the original coupon and maturity, but the auction determines the price at which the additional amount is sold. If market yields have moved since the original auction, the reopening price can be above or below par. Treasury’s auction FAQ notes that a reopening can have a different price from the original issue even though the CUSIP, maturity, and rate are unchanged. A new issue’s price is also set through its own auction, but its coupon and maturity belong to the new security. So “same coupon” and “same CUSIP” are separate checks: a reopening has both by design for the covered note or bond; a new issue does not become the same security merely because its coupon looks similar. Treasury’s marketable-securities glossary defines the reopening in those security-level terms.

The original issue date belongs to the first sale of the security. A reopening has a later issue date for the additional amount, while the CUSIP and stated maturity remain tied to the existing security. This distinction matters because a newly purchased reopened note has less time remaining to maturity than it did when Treasury first issued it. Do not read “issue date” in isolation. An offering announcement identifies the auction date, the issue or settlement date, and the security’s maturity. The security may also carry an original dated date used for coupon accrual. The official auction regulations govern how notes and bonds are offered and settled. The specific announcement and the account’s confirmation control the transaction details.

A reopened coupon security may have accrued interest from its original dated date by the time the reopened amount is issued. Depending on the terms and purchase route, the settlement amount can therefore include accrued interest in addition to the auction price. Treasury’s marketable-securities glossary explains that accrued interest collected at a reopening is returned with the first regular interest payment. That adjustment does not create an extra coupon or change the stated coupon rate. It allocates interest for the period before the new buyer’s issue date: the buyer may pay an accrued amount at settlement and later receive the full scheduled coupon, which includes the period already accrued. Read the security-specific announcement and settlement statement rather than assuming that face value multiplied by the quoted price is the complete cash debit. Bills have no periodic coupon, and TIPS or floating-rate notes have additional product-specific mechanics.

A coupon is the stated rate applied to a bond’s principal under its payment terms; yield relates the price paid to the security’s expected cash flows under a stated convention. A reopening can retain the same coupon while its price and yield differ from the original auction, because market rates and the remaining time to maturity have changed. For a valid comparison, match the CUSIP and quote convention, then account for clean price, accrued interest, and settlement date. Comparing only coupon rates can hide a premium or discount. Comparing a reopening with a new issue of a similar tenor can also mix different maturity dates and coupon schedules. The site’s Treasury on-the-run and off-the-run guide discusses why issue identity and market trading conditions matter.

A reopening increases the amount outstanding under an existing CUSIP. It does not automatically create a new benchmark security or guarantee that the issue will trade with a tighter spread. More outstanding supply may support a deeper market in some circumstances, but realized liquidity also depends on demand, dealer capacity, market conditions, and the size of available quotes. Treasury publishes a schedule of expected reopenings, but an expected schedule is not a guarantee that every listed offering will occur exactly as anticipated. Confirm the announcement for the actual security. The reopening is an auction of additional supply; after issuance, its securities share the same CUSIP and contractual cash flows as the existing issue, subject to the issue-date and accrued-interest accounting.

Assume an investor is allotted $10,000 face value in a reopening at a hypothetical price of 101.25 per $100 face. The price component is $10,125: $10,000 × 101.25 ÷ 100. This is before any accrued-interest adjustment, fees, or account-specific charges. If the same security had originally sold near par, that earlier price does not determine the reopening price. A different new note might hypothetically sell at 100.40, making the price component $10,040 for $10,000 face. The $85 difference does not by itself show which bond is cheaper or better: the notes may have different coupons, maturities, payment dates, and yields. Compare the cash flows and settlement amounts on a consistent basis. These figures are invented solely to show the arithmetic, not actual auction results or a forecast.

Start with the Treasury announcement and confirm security type, CUSIP, coupon or index terms, maturity, whether the auction is a reopening, and the issue date. Then read the auction result for the price or yield fields that apply to that product. TreasuryDirect’s auction FAQs and reopening schedule explain the public auction process and common reopening terms. Before comparing an auction award with a secondary-market quote, verify whether the displayed price is clean or includes accrued interest, the quote time, and the settlement date. If buying through a broker, check the order preview and confirmation for the cash amount and accrued-interest line. A TreasuryDirect auction purchase follows its own payment and award workflow. These channels can involve the same CUSIP but should not be treated as the same order.

Use a short sequence: identify the CUSIP; determine whether the security is a new issue or reopening; match coupon, maturity, and dates; compare the auction price or yield with the intended reference; then include accrued interest in the settlement cash amount. This prevents the common mistake of treating a later auction as a fresh bond simply because it has a new auction date. This guide focuses on nominal fixed-rate Treasury notes and bonds. Treasury bills have no coupon, and TIPS and floating-rate notes require additional index or reset details. A reopening label does not indicate whether a security fits a particular portfolio, nor does a price premium or discount predict its later return. Use the official offering terms and, where needed, ask the broker or TreasuryDirect how the account will book the specific transaction.