13-week bill means a Treasury bill where the security description is “13-Week Bill” as referenced on the Treasury auction announcement.

Accrued interest means an amount that bidders must pay to us for interest income as part of the settlement amount. Accrued interest compensates us up front for interest that bidders will be paid but did not earn because it is attributable to a period of time prior to the issue date. (See appendix B, section I, paragraph D of this part for additional explanation and examples.)

Adjusted value means, for an interest component stripped from an inflation-protected security, an amount derived by:

Auction means a bidding process by which we sell marketable Treasury securities to the public.

Autocharge agreement means an agreement in a format acceptable to Treasury between a submitter or clearing corporation and a depository institution that authorizes us to:

Bid means an offer to purchase a stated par amount of securities, either competitively or noncompetitively, in an auction.

Bid-to-cover ratio means the total par amount of securities bid for in an auction divided by the total par amount of securities awarded. It excludes bids by, and awards to, the Federal Reserve for its own account.

Bidder, as further defined in appendix A, means a person or an entity that offers to purchase Treasury securities in an auction either directly or through a depository institution or dealer. We may consider two or more persons or entities to be one bidder based on their relationship or their actions in participating in an auction. We consider a controlled account to be a bidder when an investment adviser bids in the name of the controlled account (See § 356.15.).

Bidder Identification Number means a number we assign to each institutional submitter and to certain other bidders. We assign such numbers either to identify certain bidders or to grant separate bidder status to different parts of the same corporate or partnership structure.

Book-entry security means a security that is issued or maintained as an accounting entry or electronic record in either the commercial book-entry system or in one of Treasury's two direct-hold systems - TreasuryDirect® or Legacy Treasury Direct®. (See § 356.4.)

Business day means any day on which the Federal Reserve Banks are open for business.

Call means the redemption of a security prior to maturity under the terms specified in its auction announcement.

Certificate of indebtedness means a one-day non-interest-bearing security that may be held in TreasuryDirect and that automatically matures and is rolled over each day until its owner requests that it be redeemed.

Clearing corporation means a clearing agency as defined in section 3 of the Securities Exchange Act of 1934 (15 U.S.C. 78c(a)(23)). A clearing corporation must be registered with the Securities and Exchange Commission under section 17A of the Securities Exchange Act of 1934 and its rules.

Competitive bid means a bid to purchase a stated par amount of securities at a specified yield, discount rate, or discount margin.

Consumer Price Index (CPI) means the monthly non-seasonally adjusted U.S. City Average All Items Consumer Price Index for All Urban Consumers, published by the Bureau of Labor Statistics of the Department of Labor. We use the CPI as the basis for adjusting the principal amounts of inflation-protected securities. (See appendix D.)

Corpus means the principal component of a security that has been stripped of its interest components.

CUSIP number means the unique identifying number assigned to each separate security issue and each separate STRIPS component. CUSIP numbers are provided by the CUSIP Service Bureau of Standard & Poor's Corporation. CUSIP is an acronym for Committee on Uniform Securities Identification Procedures.

Customer means a bidder that directs a depository institution or dealer to submit or forward a bid for a specific amount of securities in a specific auction on the bidder's behalf. Only depository institutions and dealers may submit bids for customers directly to us, or forward them to another depository institution or dealer.

Dated date means the date from which interest accrues for notes and bonds. The dated date and issue date are usually the same. In those cases where interest begins accruing prior to the issue date, however, the dated date will be prior to the issue date. An example is when the dated date is a Saturday and the issue date is the following Monday.

Dealer means an entity that is registered or has given notice of its status as a government securities broker or government securities dealer under Section 15C(a)(1) of the Securities Exchange Act of 1934.

Delivery and payment agreement means a written agreement between a clearing corporation and a submitter, acknowledged by a Federal Reserve Bank, regarding securities awarded to the submitter for its own account. It authorizes us to deliver such securities to, and accept payment from, a depository institution acting on behalf of the clearing corporation under an acknowledged autocharge agreement.

Depository institution means:

Discount means the difference between par and the price of the security, when the price is less than par. (See appendix B for formulas and examples.)

Discount amount means the discount divided by 100 and multiplied by the par amount. (See appendix B for formulas and examples.)

Discount margin means the margin over the index that equates the present values of the assumed cash flows on a floating rate note to the sum of the price of and accrued interest on the floating rate note. The assumed cash flows are calculated based upon the index rate applicable to the dated date. Bidders in floating rate note auctions bid on the basis of discount margin. (See appendix B.)

Discount rate means a rate of return, on an annual basis, on bills held until they mature. The discount rate is expressed in percentage terms and based on a 360-day year. It is also referred to as the “bank discount rate.” (See appendix B for formulas and examples.)

Funds account means a cash account maintained by a depository institution at a Federal Reserve Bank.

Index means the Consumer Price Index for inflation-protected securities. For floating rate notes, the index is the highest accepted discount rate on 13-week bills determined by Treasury auctions of those securities.

Index rate means the simple-interest money market yield, computed on an actual/360 basis and rounded to nine decimal places, from the highest accepted discount rate of a 13-week bill auction as announced in the Treasury auction results press release. (See appendix B for methods and examples for computing the index rate.)

Index ratio means, for an inflation-protected security, the Reference CPI of a particular date divided by the Reference CPI of the original issue date. (When the dated date is different from the original issue date, the denominator of the index ratio is the Reference CPI of the dated date rather than that of the original issue date.)

Inflation-adjusted principal means, for an inflation-protected security, the value of the security derived by multiplying the par amount by the applicable index ratio as described in appendix B, section I, paragraph B.

Interest rate means the annual percentage rate of interest paid on the par amount (or the inflation-adjusted principal) of a specific issue of notes or bonds. (See appendix B for methods and examples of interest calculations on notes and bonds.)

Intermediary means a depository institution or dealer that forwards bids for customers to another depository institution or dealer. An intermediary does not submit bids directly to us.

Issue date means the date specified in the auction announcement on which we issue a security as an obligation of the United States. Interest normally begins to accrue on a security's issue date.

Legacy Treasury Direct means a non-Internet-based book-entry system maintained by Treasury for purchasing and holding marketable Treasury securities directly with Treasury. (See 31 CFR part 357.)

Marketable security means a security that may be bought, sold and transferred in the secondary market.

Maturity date means the date on which a security becomes due and payable, and ceases to earn interest. The maturity date is specified in the auction announcement.

Minimum to bid means the smallest amount of a security that may be bid for in an auction as stated in the auction announcement.

Multiple to bid means the smallest additional amount of a security that may be bid for in an auction as stated in the auction announcement.

Multiple-price auction means an auction in which each successful competitive bidder pays the price equivalent to the yield, discount rate, or discount margin that it bid.

Noncompetitive bid means, for a single-price auction, a bid to purchase a stated par amount of securities at the highest yield, discount rate, or discount margin awarded to competitive bidders. For a multiple-price auction, a noncompetitive bid means a bid to purchase securities at the weighted average yield, discount rate, or discount margin of awards to competitive bidders.

Offering amount means the par amount of securities we are offering to the public for purchase in an auction, as specified in the auction announcement.

Par means a price of 100. (See appendix B.)

Par amount means the stated value of a security at original issuance.

Person means a natural person.

Premium means the difference between par and the price of the security, when the price is greater than par.

Premium amount means the premium divided by 100 and multiplied by the par amount.

Price means the price of a security per 100 dollars of its stated value as calculated using the formulas in appendix B.

Real yield means, for an inflation-protected security, the yield based on the payment stream in constant dollars. In other words, the real yield is the yield in the absence of inflation.

Reference CPI (Ref CPI) means, for an inflation-protected security, the index number applicable to a given date. (See appendix B, section I, paragraph B.)

Reopening means the auction of an additional amount of an outstanding security.

Security means a Treasury bill, note, or bond, each as described in this part. Security also means any other obligation we issue that is subject to this part according to its auction announcement. Security includes an interest or principal component under the STRIPS program, as well as a certificate of indebtedness in an investor's TreasuryDirect account.

Settlement means final and complete payment for securities awarded in an auction and delivery of those securities.

Settlement amount means the total of the par amount of securities awarded, less any discount amount or plus any premium amount, and plus any accrued interest. For inflation-protected securities, the settlement amount also includes any inflation adjustment when such securities are reopened or when the dated date is different from the issue date.

Single-price auction means an auction in which all successful bidders pay the same price regardless of the yields, discount rates, or discount margins they each bid.

Spread means the fixed amount over the life of a floating rate note that is added to the index rate in order to determine the interest rate of the floating rate note. The spread will be determined in the auction of a new floating rate note and is expressed in tenths of a basis point (i.e., to three decimals). Additionally, the spread will be equal to the high discount margin at the time a new floating rate note is auctioned.

STRIPS (Separate Trading of Registered Interest and Principal of Securities) means our program under which eligible securities are authorized to be separated into principal and interest components, and transferred separately. These components are maintained and transferred in the commercial book-entry system.

Submitter means a person or entity submitting bids directly to us for its own account, for customer accounts, or both. Only depository institutions and dealers are permitted to submit bids for customer accounts. We permit investment advisers to submit bids on behalf of controlled accounts.

TINT means an interest component from a stripped security.

TreasuryDirect means the book-entry, online system maintained by Treasury for purchasing and holding marketable Treasury securities, nonmarketable savings bonds, and certificates of indebtedness directly with Treasury. (See 31 CFR part 363.)

We (or “us”) means the Secretary of the Treasury and his or her delegates, including the Department of the Treasury, Bureau of the Fiscal Service, and their representatives. The term also includes Federal Reserve Banks acting as fiscal agents of the United States.

Weighted-average means the average of the yields, discount rates, or discount margins at which we award securities to competitive bidders in multiple-price auctions weighted by the par amount of securities allotted at each yield, discount rate, or discount margin.

Yield means the annualized rate of return to maturity on a non-indexed security. Yield is expressed as a percentage. For an inflation-protected security, yield means the real yield. Yield is also referred to as “yield to maturity.” (See appendix B.)

You means a prospective bidder in an auction.