A bond agreement is the legally binding contract between a borrower (the issuer) and the investors who lend it money (the bondholders), setting out every term of the loan: how much was borrowed, what interest rate will be paid, when the principal comes back, and what happens if the issuer breaks its promises. In corporate finance the same document is usually called a bond indenture. It governs the relationship from the day the bond is issued until the final dollar is repaid at maturity, and it is the document that gives bondholders enforceable legal rights.
The Trust Indenture Act of 1939 defines an indenture broadly as any mortgage, deed of trust, or similar agreement under which securities are outstanding or will be issued.1GovInfo. 15 USC 77ccc – Trust Indenture Act Definitions In practice, the indenture is the master contract held by a corporate trustee, and the individual bond is evidence of each investor’s share of that debt.2Securities and Exchange Commission. Investor Bulletin – Corporate Bonds
What’s Inside a Bond Agreement
Every bond agreement fixes a handful of financial terms that decide what the bondholder earns and when.
- Principal. Also called face value or par value, this is the amount the issuer must repay at maturity. A bond’s market price can drift above or below par as interest rates move, but the principal is the fixed number owed on the final day.3Investor.gov. Bonds
- Coupon rate. The interest rate paid on the principal. A fixed-rate bond locks the rate in for the life of the bond; a $10,000 bond with a 5% coupon pays $500 a year, typically as two $250 payments six months apart. Variable-rate bonds adjust periodically against a benchmark.4Municipal Securities Rulemaking Board. Interest Payments
- Maturity date. The date the full principal must be returned. Maturities can run from a few months to 30 years or more.
- Payment schedule. Exactly when interest is due. Most bonds pay semi-annually on fixed dates.
Who’s Named in the Agreement
The issuer is the entity borrowing the money: a corporation, a city, a state agency, or the federal government. Its obligation is simple to state: make every interest payment on time and return the principal at maturity. The bondholder is the lender, and buying the bond gives that investor a legal right to those payments.3Investor.gov. Bonds
Sitting between the two is the trustee, usually a bank or trust company. The Trust Indenture Act requires that at least one trustee be a corporation authorized to exercise corporate trust powers and subject to federal or state regulatory oversight.5GovInfo. Trust Indenture Act of 1939 The trustee monitors whether the issuer is meeting its obligations, receives financial reports, and acts on bondholders’ behalf if the issuer defaults.2Securities and Exchange Commission. Investor Bulletin – Corporate Bonds
Two more roles keep the bond running after issuance. The paying agent distributes interest and principal to bondholders on the issuer’s behalf. The registrar maintains the official record of who owns which bonds and updates it when bonds change hands, so payments reach the right investors. Often a single institution handles both jobs.
Covenants and What Happens in Default
Covenants are the promises the issuer makes to protect the investment, and they come in two forms. Affirmative covenants require the issuer to do specific things: maintain insurance, deliver audited financial statements, and hold certain financial ratios above agreed thresholds. Negative covenants restrict the issuer from taking on too much additional debt, selling off major assets, or paying oversized dividends. The SEC notes that bond indentures commonly include covenants limiting additional debt and requiring the issuer to maintain certain financial ratios.2Securities and Exchange Commission. Investor Bulletin – Corporate Bonds
The agreement also defines what counts as a default and what happens next. A missed interest payment is the obvious trigger, but a covenant violation can also qualify. Most agreements build in a cure period that gives the issuer a window to fix the problem before it hardens into a formal event of default. If the issuer doesn’t cure in time, the trustee can invoke remedies for bondholders. The strongest is acceleration, which makes the entire principal balance due immediately rather than at maturity.
Secured or Unsecured, Senior or Subordinated
The agreement will state whether specific assets stand behind the bond. Secured bonds are backed by collateral: real estate, equipment, receivables, or other pledged property. If the issuer defaults, bondholders can claim and sell that collateral. Secured bonds generally carry lower interest rates because the risk is lower.
Unsecured bonds, commonly called debentures, rely on the issuer’s general creditworthiness and its promise to pay. There is no specific asset a bondholder can seize. Debenture holders stand behind secured creditors in a default, and to compensate for that risk they earn a higher interest rate. The agreement states plainly whether collateral is pledged and what it is.
Ranking matters again if the issuer files for bankruptcy. Federal bankruptcy law sets a strict priority ladder for claims against a bankrupt entity.6Office of the Law Revision Counsel. 11 USC 507 – Priorities Secured bondholders look to their collateral for repayment. Unsecured bondholders are general creditors, standing behind domestic support obligations, administrative expenses, employee wages (up to a capped amount per person), and tax claims owed to government entities, among others. Unsecured bondholders often recover only a fraction of their investment in a bankruptcy.
A senior bond agreement will also specify that its holder ranks ahead of junior or subordinated debt. If remaining assets can’t cover everyone, subordinated bondholders may recover nothing. That hierarchy belongs in the agreement, and it is one of the first things careful investors check before buying.
Call and Sinking Fund Provisions
Many bond agreements let the issuer retire the bond before maturity. These provisions matter because they can cut short the income the bondholder was counting on.
An optional call provision lets the issuer buy back bonds at a set price, usually only after a specified date. Many municipal bonds become callable 10 years after issuance. The call price is typically at or slightly above face value. Some agreements include a make-whole call, which requires the issuer to pay a lump sum calculated to compensate bondholders for the future interest they’ll miss. Call risk is real: if interest rates drop, the issuer can call the bond, hand back the principal, and refinance at a lower rate, leaving the bondholder to reinvest at whatever the market now offers.7FINRA. Callable Bonds – Your Issuer May Come Calling
A sinking fund provision works differently. It requires the issuer to retire a portion of the bond issue on a regular schedule, usually annually. Individual bonds to be retired are typically selected at random, so a holder doesn’t know in advance whether their bond will be called in any given year. Remaining bondholders benefit from reduced credit risk as the outstanding debt shrinks over time.
Changing the Terms After Issuance
Bond agreements aren’t frozen, but changing the core terms is deliberately hard. Most indentures split changes into two categories. Minor administrative amendments can be handled by the issuer and trustee without bondholder input. Changes to the “sacred rights” of the bond, meaning the principal amount, the coupon rate, and the maturity date, traditionally require unanimous bondholder consent in the United States. Some newer indentures have experimented with thresholds as low as 90% approval, but that remains controversial and far from standard practice. The high bar exists to keep an issuer from teaming up with a bare majority to strip value from minority holders.
The Legal Framework Behind the Document
Federal securities law shapes how a bond agreement gets written and who signs it. In general, all securities offered to the public in the United States must be registered with the SEC or qualify for an exemption. A registration filing describes the issuer’s business, the security being offered, management, and certified financial statements. Common exemptions include private placements, offerings of limited size, and securities issued by government entities.8Investor.gov. Registration Under the Securities Act of 1933
For publicly offered corporate bonds, the Trust Indenture Act adds a second layer. It bars the sale of debt securities in a public offering unless they are issued under a qualified indenture with an independent trustee. The institutional trustee must be a regulated corporation with at least $150,000 in combined capital and surplus, and it must be free of conflicts of interest with the issuer.5GovInfo. Trust Indenture Act of 1939 Municipal bonds and certain other securities exempt from the Securities Act are not subject to the Trust Indenture Act, so a municipal bond’s governing document will look different from a corporate indenture even though it plays the same role.