Tax-exempt financing for private projects works through private activity bonds: a state or local government entity issues municipal bonds on behalf of a private borrower, and because interest paid to investors is exempt from federal income tax under Section 103 of the Internal Revenue Code, the borrower pays a lower rate than conventional financing would deliver. The trade-offs are real. Only certain project types qualify, the deal has to run through a governmental conduit issuer, the developer competes for a limited annual state allocation, and compliance obligations run for the entire life of the bonds. A slip at issuance or years later can retroactively strip the tax exemption and turn a cheap loan into an expensive one.
What Projects Qualify
The Internal Revenue Code confines tax-exempt private activity financing to three main buckets: exempt facility bonds under Section 142, small issue bonds under Section 144, and 501(c)(3) bonds under Section 145.
Exempt Facility Bonds (Section 142)
Section 142 covers infrastructure that serves the public. The qualifying list is broader than most developers realize: airports, docks, solid waste disposal, water and sewage systems, mass transit, local electric and gas distribution, hazardous waste facilities, high-speed rail, broadband, and carbon dioxide capture facilities.1Office of the Law Revision Counsel. 26 U.S. Code 142 – Exempt Facility Bond Qualified residential rental projects also fall under Section 142, which is what makes it the backbone of affordable housing finance. For some categories, including airports, docks, and mass transit, the financed property must be owned by a government entity even if a private operator runs day-to-day business.
Small Issue Bonds (Section 144)
Section 144 is aimed at smaller projects, particularly manufacturing. The default cap on face amount is $1 million, but issuers can elect a higher $10 million ceiling. Choosing the higher limit brings in a six-year capital expenditure test spanning three years before and three years after the issue date; the total of those expenditures plus the bond face amount cannot exceed $10 million.2Office of the Law Revision Counsel. 26 USC 144 – Qualified Small Issue Bond; Qualified Student Loan Bond; Qualified Redevelopment Bond Expenditures forced by a change in law, or needed to replace property damaged by a natural disaster, are excluded from that count.
501(c)(3) Bonds (Section 145)
Private universities, hospitals, and other 501(c)(3) organizations can finance dormitories, research centers, and medical buildings with tax-exempt bonds under Section 145.3Office of the Law Revision Counsel. 26 USC 145 – Qualified 501(c)(3) Bond These bonds are exempt from the annual state volume cap that constrains most other private activity bonds.4Office of the Law Revision Counsel. 26 USC 146 – Volume Cap
Affordable Housing Occupancy Tests
Residential rental projects under Section 142(d) qualify only if the borrower elects and continually meets one of two occupancy tests. Under the 20-50 test, at least 20 percent of units must be both rent-restricted and occupied by tenants earning 50 percent or less of area median gross income. Under the 40-60 test, at least 40 percent of units must meet the same standard at 60 percent of area median income.5Internal Revenue Service. Revenue Ruling 2020-4 The elected test must be met at all times during the qualified project period. Slipping below it puts tax-exempt status on the entire issue at risk, which is why developers usually build a cushion above the minimum.
The State Volume Cap
Section 146 caps the total dollar amount of private activity bonds each state can issue each year. For 2026, the cap is the greater of $135 multiplied by state population or $397,625,000.6Internal Revenue Service. Revenue Procedure 2025-32 Those figures are indexed for inflation. A state with five million residents would have roughly $675 million to spread across every qualifying project statewide.
Developers apply through the state’s designated allocating authority, and this is often the single biggest bottleneck. Demand routinely exceeds supply, particularly for housing bonds. Without an allocation, the deal cannot proceed as tax-exempt financing. States that carry forward unused allocation from prior years may have additional capacity. Qualified 501(c)(3) bonds and certain exempt facility bonds for airports, docks, and broadband do not count against the cap.4Office of the Law Revision Counsel. 26 USC 146 – Volume Cap
Why a Conduit Issuer Is Required
A private developer cannot issue tax-exempt bonds directly. The bonds have to be issued by a governmental entity, usually a state or local development authority, acting as a conduit. The authority lends its name and its tax-exempt borrowing authority to the deal, but it does not pledge its own credit or taxing power. The private borrower makes all debt service payments and posts all collateral.
Before agreeing to sponsor an issue, the conduit issuer weighs whether the project delivers a genuine public benefit: job creation, community investment, environmental improvement, expanded healthcare, more housing. A pure private profit center with no community upside will have trouble finding a willing issuer. Application fees typically run a few thousand dollars and are non-refundable regardless of outcome. Annual monitoring fees add a recurring cost throughout the life of the bonds.
Getting to Closing
The Inducement Resolution
The developer submits a formal application: project description, audited financial statements (usually three prior fiscal years), and proof of site control such as a deed or purchase option. If staff recommend proceeding, the issuer adopts an inducement resolution declaring preliminary intent to issue bonds. This step has a practical deadline behind it. Under Treasury regulations, the issuer must adopt a declaration of official intent no later than 60 days after any project expenditure the developer wants to later reimburse with bond proceeds.7eCFR. 26 CFR 1.150-2 – Proceeds of Bonds Used for Reimbursement Costs paid more than 60 days before the resolution generally cannot be reimbursed with tax-exempt money.
The TEFRA Hearing
Section 147(f) requires that private activity bonds be approved by an applicable elected representative after a public hearing with reasonable notice.8Office of the Law Revision Counsel. 26 USC 147 – Other Requirements Applicable to Certain Private Activity Bonds This is the TEFRA hearing, named for the Tax Equity and Fiscal Responsibility Act. Notice must be published at least seven days in advance in a newspaper of general circulation or on the government entity’s website. The statute defines “applicable elected representative” broadly: an elected legislative body, a chief elected executive such as a governor or mayor, or another elected official designated by state law. Without this approval the bonds cannot carry tax-exempt status.
Form 8038 and Bond Counsel
The issuer files IRS Form 8038 for every tax-exempt private activity bond issue, reporting issuer details, bond type, issue price, and weighted average maturity.9Internal Revenue Service. Form 8038 – Information Return for Tax-Exempt Private Activity Bond Issues Bond counsel reviews the structure and delivers the legal opinion that the bonds qualify for tax exemption. Their fees on a typical private activity bond deal run roughly $50,000 to $150,000 depending on size and complexity, making them one of the larger single transaction costs.
What You Can and Cannot Do With the Proceeds
Arbitrage and Rebate
Section 148 prohibits using bond proceeds to invest in securities yielding more than the bonds themselves pay. An issuer borrowing at 4 percent and parking proceeds in investments earning 5 percent has generated arbitrage.10Office of the Law Revision Counsel. 26 USC 148 – Arbitrage Even where temporary higher-yielding investment is allowed during construction, excess earnings must be rebated to the U.S. Treasury.11Internal Revenue Service. Complying With Arbitrage Requirements – A Guide for Issuers of Tax-Exempt Bonds The calculations are complicated enough that most borrowers hire a specialized rebate analyst, another ongoing cost.
The 2 Percent Issuance Cost Cap
Under Section 147(g), no more than 2 percent of bond proceeds can pay costs of issuance, which include legal fees, underwriting, printing, and rating agency charges. Anything above that has to come from the borrower’s own funds or from taxable financing.12Internal Revenue Service. Excess Costs of Issuance for Private Activity Bonds Bond insurance premiums and certain letter-of-credit fees may qualify as interest expense rather than issuance costs, letting them sit outside the 2 percent limit. On smaller deals, where fixed transaction costs consume a bigger share of proceeds, this cap becomes a real structural constraint.
Maturity Limit
The weighted average maturity of the bonds cannot exceed 120 percent of the average reasonably expected economic life of the financed facilities.8Office of the Law Revision Counsel. 26 USC 147 – Other Requirements Applicable to Certain Private Activity Bonds Land is generally excluded unless it represents 25 percent or more of net proceeds, in which case it is treated as having a 30-year economic life. The rule blocks stretching repayment far beyond the useful life of the asset.
AMT Treatment Affects the Rate You Pay
Interest on most private activity bonds is exempt from regular federal income tax, but under Section 57(a)(5) it is treated as a preference item for the Alternative Minimum Tax.13Office of the Law Revision Counsel. 26 USC 57 – Items of Tax Preference The AMT treatment does not reach 501(c)(3) bonds, qualified residential rental project bonds, or qualified mortgage bonds. For the categories that are subject to AMT, some investors effectively lose the tax benefit, softening demand and pushing the borrower’s rate slightly higher.
Compliance Runs for the Life of the Bonds
Federal tax requirements do not stop at closing. They apply as long as the bonds are outstanding, often 20 to 30 years.14Internal Revenue Service. TEB Post-Issuance Compliance – Some Basic Concepts Issuer and borrower must monitor how bond-financed property is used, track arbitrage on invested proceeds, and keep records sufficient to prove compliance. The IRS recommends written procedures that name a specific person responsible for periodic reviews and corrective action.
The most common failure is a change in how the financed property is used. A building that originally qualified but then gets leased to a private business outside the exempt purpose can cost the issue its tax status. When a violation surfaces, the IRS Voluntary Closing Agreement Program lets the issuer resolve it, typically through a closing agreement and payment to the Treasury rather than full loss of tax exemption on the entire issue.15Internal Revenue Service. TEB Voluntary Closing Agreement Program Self-reporting before an audit generally produces a better outcome than waiting for the IRS to find the problem.
Public Disclosure Through EMMA
Before the bonds are sold, the underwriter prepares an official statement setting out the terms, sources of repayment, any credit enhancements such as bond insurance, tax status of the interest, and risks. It is the bond market equivalent of a prospectus. The underwriter submits it to the Municipal Securities Rulemaking Board for posting on the EMMA website, where it becomes publicly available.16Municipal Securities Rulemaking Board. Official Statements Investors must receive it no later than settlement. Private companies used to keeping their finances confidential are sometimes surprised by how much detail about the project and the borrower’s financial condition ends up in a document anyone can pull up online.