Agency Bond
An agency bond is a debt security issued by a U.S. government-sponsored enterprise (GSE) or a federally related institution, such as Fannie Mae, Freddie Mac, or the Federal Home Loan Banks, typically offering yields modestly above comparable Treasury securities in exchange for a small credit or liquidity premium.
The term agency bond covers a broad category of U.S. fixed income securities. At one end of the spectrum are bonds issued by true federal agencies — such as the Federal Farm Credit Banks and the Federal Home Loan Banks — which carry the implied or explicit backing of the U.S. government. At the other end are debt securities issued by government-sponsored enterprises like Fannie Mae (FNMA) and Freddie Mac (FHLMC), which were created by Congress to support housing finance but were, until 2008, structured as shareholder-owned corporations without explicit government guarantees.
The 2008 financial crisis fundamentally altered the agency bond market. The Federal Housing Finance Agency (FHFA) placed Fannie Mae and Freddie Mac into conservatorship in September 2008, effectively subjecting their obligations to an implicit government guarantee that stabilized their credit standing. As of the mid-2020s, both entities remain in conservatorship, and their debt and mortgage-backed securities are widely treated by investors as having near-Treasury credit quality.
Agency bonds typically offer yields between 10 and 50 basis points above comparable Treasuries, reflecting their slightly more complex credit status, smaller issue sizes compared to Treasury benchmarks, and marginally lower liquidity in the secondary market. They are exempt from state and local income taxes on interest income — the same exemption that applies to Treasury securities — but are subject to federal income tax.
Institutional fixed income managers use agency bonds to modestly enhance yield relative to pure Treasury portfolios while maintaining very high credit quality. Commercial banks hold substantial agency portfolios in their held-to-maturity and available-for-sale investment books. The Federal Reserve itself has historically held trillions of dollars in agency bonds and agency mortgage-backed securities on its balance sheet as part of its quantitative easing programs.
Callable agency bonds are common, particularly among Federal Home Loan Bank issues, and require investors to analyze option-adjusted spreads (OAS) rather than nominal yield spreads to assess relative value appropriately. A callable agency bond may appear to offer an attractive nominal yield but deliver a lower effective return if the issuer exercises its call option when rates decline.