An interim bond is a short-term debt instrument that a state or local government issues to pay for the early stages of a capital project before permanent financing is arranged. Maturities typically run from three months to three years, and the issuer repays the note in a single lump sum using proceeds from a future long-term bond sale or an expected grant. Think of it as a bridge loan for public infrastructure: a school district can break ground now and pay off the note once it sells 20-year bonds at a better rate later.
How Interim Bonds Work
The mechanic is straightforward. A public agency needs cash now but isn’t ready to lock in decades of debt. It issues a short-term note, spends the proceeds on early costs like land acquisition, engineering, and initial construction, and then retires the note when permanent bonds are sold or grant funds arrive. The entire principal comes due on a single date at the end of the term, a structure known as bullet maturity.
Interest rates on interim notes are generally lower than what the issuer would pay on long-term debt, which is one of their main draws. Some carry fixed rates set at issuance; others float against a short-term benchmark. Because the maturity is brief and the repayment source is tied to a specific future event rather than open-ended tax collections, investors treat these notes as relatively low-risk money market instruments.
That repayment promise is what distinguishes interim bonds from ordinary short-term municipal borrowing. The issuer isn’t just pledging future tax revenue; it’s telling investors that a particular capital event, such as a long-term bond sale or grant disbursement, will produce the cash to pay them back. That linkage shapes the note’s pricing, its risk profile, and its legal documentation.
The Two Main Types
Bond Anticipation Notes
Bond Anticipation Notes, or BANs, are the most common form. A municipality issues BANs when it plans to sell long-term General Obligation or Revenue Bonds later but needs capital now. The notes are sold with the understanding that the issuer won’t have enough cash on hand at maturity to repay them from operating funds; the expected repayment source is the proceeds from the long-term bond issuance that replaces them.1Municipal Securities Rulemaking Board. Municipal Bond Basics
BANs let agencies start construction or secure property before conditions are right for a large bond offering. A county building a new courthouse might issue a one-year BAN to fund site preparation and architectural work, then sell 25-year bonds once the project scope and budget are finalized.
Grant Anticipation Notes
Grant Anticipation Notes, or GANs, work on the same principle, but the repayment source is a committed federal or state grant rather than future bond proceeds. Many government grants reimburse costs only after certain project milestones are reached, which creates a cash-flow gap. A GAN lets the municipality front those costs, bridging the period between the grant award and the actual disbursement.
The key requirement for a GAN is near-certainty that the grant money will arrive. The amount must have been budgeted, and the conditions for release must be within the issuer’s control. Without that assurance, investors wouldn’t accept the note as a reasonable short-term risk.
Not the Same as TANs or RANs
Not all short-term municipal notes are interim bonds. Tax Anticipation Notes (TANs) are repaid from future tax receipts, and Revenue Anticipation Notes (RANs) are repaid from anticipated operating revenue. Both cover ordinary budget timing gaps rather than capital projects. BANs and GANs, by contrast, are tied to a specific future capital event. If you’re reading about a note that funds day-to-day government operations, that’s a TAN or RAN, not an interim bond.
Why Governments Use Them
Several situations make immediate permanent financing impractical, and interim bonds exist to handle them.
- Unfavorable rate environment. If long-term interest rates are elevated, locking in 20 or 30 years of debt is expensive. A short-term note lets the project proceed while the issuer waits for rates to fall.
- Incomplete project scope. Selling long-term bonds requires knowing the total cost. During early phases like engineering studies and site preparation, the final price tag may still be uncertain. A BAN covers preliminary costs without committing to a premature bond size.
- Pending voter or regulatory approval. Many jurisdictions require voter authorization for long-term debt, and that process can take months. A short-term note lets construction start while the political process runs its course.
- Grant disbursement delays. Federal grants often reimburse costs only after work is completed and inspected. A GAN prevents those delays from stalling the project or jeopardizing the grant by missing deadlines.
The common thread is timing. The issuer has reasonable certainty that permanent funding will materialize; the interim bond fills the gap between when spending starts and when the long-term money arrives.
Take-Out Financing and Rollover Risk
The planned replacement of an interim bond with long-term debt is called take-out financing. When the issuer sells its permanent General Obligation or Revenue Bonds, the proceeds go directly toward paying off the outstanding notes, both principal and accrued interest. From there, the project’s debt shifts to a standard long-term amortization schedule.
That refinancing event is what gives interim bonds their security. It is also the source of their principal risk. A credit downgrade, a sudden spike in interest rates, or a project failure could all prevent the issuer from successfully selling long-term bonds by the note’s maturity date. During New York City’s 1975 fiscal crisis, neighboring Monroe County tried to roll over its short-term notes at public auction and found no buyers, purely because of contagion fears from the city’s problems.
To guard against this, issuers frequently arrange a backup liquidity facility with a commercial bank. The bank commits to provide funds if the permanent bond sale can’t be executed on schedule, acting as credit enhancement so investors know they’ll be repaid even if market conditions turn against the issuer at the worst moment.2Municipal Securities Rulemaking Board. Primary and Continuing Disclosure Obligations
Tax Treatment
Because interim bonds are obligations of a state or political subdivision, the interest they pay is generally excluded from federal gross income under the same rule that applies to municipal bonds broadly.3Office of the Law Revision Counsel. 26 USC 103 – Interest on State and Local Bonds That exemption is a significant part of the appeal for investors in higher tax brackets, since the effective after-tax yield is higher than the stated rate suggests.
There are exceptions. Private activity bonds that don’t qualify under federal rules, arbitrage bonds, and bonds not in registered form all lose the exemption.3Office of the Law Revision Counsel. 26 USC 103 – Interest on State and Local Bonds For a standard BAN issued by a school district or county for public infrastructure, though, the interest is almost always tax-exempt at the federal level. You still need to report it on your federal return as an information item; reporting it doesn’t make it taxable.4Internal Revenue Service. Topic No. 403, Interest Received State tax treatment varies.
What to Check Before Buying One
Interim bonds appeal to investors who want tax-exempt income on a short timeline. Because of their brief maturities and money-market characteristics, BANs are rated on short-term scales rather than the familiar long-term letter grades. Moody’s, for instance, uses its Municipal Investment Grade (MIG) scale for these instruments.
The investor base tends toward institutional buyers, including money market funds and local banks. Smaller BANs are often purchased directly by community banks in the issuing municipality’s region. Individuals can participate too, though the denominations and short holding periods make these notes more practical for portfolio managers than for someone parking savings.
The central risk to evaluate is rollover risk. A bank liquidity facility substantially reduces it, so confirming one is in place is worth the effort. The issuer’s overall creditworthiness and the feasibility of the underlying project matter as well. A BAN for a well-planned school renovation by a stable district is a very different proposition from one issued by a fiscally strained municipality for a speculative project. The official statement filed on the MSRB’s EMMA system is the best single source for the specific note’s terms, the issuer’s finances, and the planned take-out.5eCFR. 17 CFR 240.15c2-12 – Municipal Securities Disclosure