Private activity bonds are municipal bonds whose proceeds materially benefit private users, making tax qualification and conduit credit analysis central.
Private activity bonds (PABs) are municipal bonds whose proceeds materially benefit private users or are secured by private payments in ways that trigger federal private-activity bond rules. A qualified private activity bond may still have tax-exempt interest, but the tax, credit, and disclosure analysis is different from a purely governmental bond.
In practice, many PABs are conduit financings. A state or local issuer sells the bonds, but a private or nonprofit borrower, project, or revenue source is the economic credit behind repayment.
A public issuer may issue bonds for a project that has public-policy benefits but substantial private use, such as affordable housing, airports, docks, solid-waste facilities, qualified nonprofit facilities, student loans, or mortgage programs. The borrower or project typically makes payments that support debt service.
The official statement should identify the issuer, borrower or obligor, project, repayment source, tax status, covenants, call features, and risk factors. Investors should not assume that the public issuer’s taxes back the bond unless the documents say so.
| Feature | Governmental bond | Private activity bond |
|---|---|---|
| Primary use of proceeds | Governmental facilities or activities. | Private-user or conduit project, if qualification rules are met. |
| Main credit focus | Government issuer, tax base, revenue system, or public-purpose pledge. | Borrower, project, pledged revenues, lease payments, or conduit structure. |
| Tax question | Whether issuer and use satisfy tax-exempt requirements. | Whether the PAB is qualified and whether AMT or other tax rules apply. |
| Common mistake | Assuming tax exemption means no risk. | Assuming the government issuer is the economic obligor. |
| Evidence | Why it matters |
|---|---|
| Qualified private activity bond status | Determines whether federal tax exemption may apply. |
| Borrower or obligor | Identifies the party most responsible for repayment economics. |
| Use-of-proceeds section | Shows whether proceeds finance a qualifying project or private use. |
| Tax section and bond counsel opinion | Explains regular federal tax, AMT, and other tax considerations. |
| Security and covenants | Shows pledged revenues, reserves, remedies, and limitations. |
| Call provisions | Can change yield-to-worst and reinvestment risk. |
| Continuing disclosures | Updates borrower and project performance after issuance. |
Assume a public development authority issues $60 million of qualified private activity bonds for a privately operated facility. The authority lends the proceeds to the operator, and the bond documents state that principal and interest are payable solely from the operator’s loan payments. No city tax pledge supports the bonds.
The authority is the named issuer, but the operator is the economic obligor. Credit review should therefore focus on the operator’s cash flow, project demand, construction and operating risks, pledged collateral, reserves, covenants, and ability to make the loan payments. A strong public issuer name does not replace that analysis.
Suppose these bonds yield 4.20% while a comparable governmental bond yields 3.80%. The 0.40-percentage-point spread may compensate for conduit credit, project, liquidity, call, or tax risk; it is not free additional return. If the official statement identifies the interest as specified private activity bond interest, the reader should also determine whether AMT treatment changes the after-tax comparison.