Debenture

A debenture is an unsecured or partially secured debt instrument that relies on the issuer's credit standing and reputation rather than a specific asset pledge. In general corporate finance, companies issue debentures to raise capital without tying specific assets as collateral.

In SBA 504 lending, the term has a specific meaning: a debenture is a bond issued by a Certified Development Company (CDC) and guaranteed by the Small Business Administration. These debentures are pooled and sold to investors through a monthly public sale conducted by the SBA. The interest rate established at each monthly sale, known as the debenture rate, determines the fixed rate that borrowers pay on the CDC/SBA portion of their 504 loan for the full loan term (typically 10, 20, or 25 years).

The SBA 504 debenture rate is based on current U.S. Treasury yields at the time of sale plus a small spread. Because the debentures carry a full SBA guarantee, the spread above Treasuries is narrow, resulting in below-market fixed rates for borrowers. The effective rate to borrowers includes the debenture rate plus an annual SBA guarantee fee (currently 0.375%) and a CDC servicing fee (typically 0.625%), bringing the all-in effective rate roughly 100 basis points above the base debenture rate.

The debenture rate is the single most important variable in SBA 504 loan pricing. Unlike SBA 7(a) loans, which are typically variable-rate and priced off the prime rate, the 504 debenture portion locks in a fixed rate for the full term at the time of funding. This means the month in which a 504 loan funds can meaningfully affect the borrower's rate for the next 10, 20, or 25 years.

Because debenture rates are set monthly through a public sale process, they fluctuate with Treasury yields. Borrowers and lenders track the debenture rate cycle to time 504 loan closings favorably. A 25-basis-point swing in the debenture rate on a $2 million 504 loan changes the annual interest cost by $5,000.

Confusing the debenture rate with the effective rate. The debenture rate is the base rate paid to bond investors. The borrower's effective rate includes additional fees: the SBA guarantee fee and the CDC annual servicing fee. The effective rate is typically about 100 basis points higher than the published debenture rate. When comparing 504 rates to other loan products, use the effective rate, not the debenture rate.

Assuming debenture rates move with the prime rate. SBA 504 debenture rates are Treasury-based, not prime-based. Federal Reserve rate cuts directly lower the prime rate (and therefore SBA 7(a) rates), but they do not directly lower 504 debenture rates. Treasury yields have their own market dynamics and can move independently of fed funds changes. Understanding the difference between fixed and variable rate structures clarifies why these two SBA programs respond differently to Fed policy.

Treating the debenture as the entire 504 loan. The SBA 504 loan structure has three components: a conventional bank loan (typically 50% of the project cost), the CDC/SBA debenture (up to 40%), and a borrower equity injection (at least 10%). The debenture rate applies only to the CDC portion, not the entire project financing.