Advance refunding refinances outstanding bonds more than 90 days before redemption, usually using escrowed proceeds until call or maturity.
Advance refunding is a bond refinancing in which new refunding bonds are issued more than 90 days before the prior bonds are redeemed. The proceeds are usually placed in an escrow invested in permitted securities, and the escrow pays debt service on the old bonds until they are called or mature.
In municipal finance, the term matters because advance refunding can change issuer debt-service costs, investor call expectations, escrow-backed credit exposure, and tax treatment. Federal tax rules sharply limit when interest on advance refunding bonds can be tax-exempt, so the official statement and tax opinion are essential.
The issuer sells new refunding bonds before the old bonds can be called. Proceeds go into an escrow fund, often invested in U.S. government obligations or other permitted securities. The escrow is structured to pay the old bonds’ interest and principal until redemption.
If the escrow is sufficient and legally pledged, the old bonds may become defeased, meaning the original issuer pledge may be replaced or supplemented by the escrow as the practical payment source. Bondholders still need to read the escrow agreement, verification report, call notice, and official statement rather than assuming all refunded bonds behave the same way.
| Feature | Advance refunding | Current Refunding |
|---|---|---|
| Timing | More than 90 days before redemption. | Immediate redemption or redemption within the current-refunding window. |
| Old bonds | Usually remain outstanding until call or maturity. | Usually paid quickly. |
| Escrow | Longer escrow is central to the transaction. | Escrow is short or unnecessary. |
| Tax focus | Federal advance-refunding limits and taxable vs. tax-exempt status. | Current-refunding qualification and ordinary tax-exempt bond requirements. |
| Investor focus | Defeasance, escrow quality, call date, and reinvestment timing. | Call date, redemption price, accrued interest, and reinvestment timing. |
A county has 5.25% bonds that cannot be called for three years. Rates have fallen, so the county issues taxable refunding bonds now and deposits proceeds into an escrow. The escrow pays scheduled debt service on the old bonds until the first call date, when the old bonds are redeemed. The county may lock in savings, while old bondholders now analyze escrow-backed payment and call timing instead of the original long-term pledge alone.
Before 2018, tax-exempt advance refunding was a common municipal finance tool subject to detailed federal limits. Current IRS materials continue to define advance refunding by the more-than-90-day timing rule and explain that taxable advance refunding may be an option when tax-exempt advance refunding is not available.
For readers, the practical point is simple: do not assume the new refunding bonds are tax-exempt or that the old bonds keep the same credit profile. Review the official statement, tax opinion, advance refunding document, escrow agreement, verification report, and EMMA disclosures.
| Evidence | Why it matters |
|---|---|
| Redemption date of refunded bonds | Determines whether the transaction is advance or current refunding. |
| Escrow agreement and securities | Shows how old bondholders will be paid before redemption. |
| Verification report | Supports whether escrow cash flows are expected to be sufficient. |
| Official statement and tax opinion | Explains tax status, legal structure, and investor risks. |
| Call provisions and notice | Determine when the old bonds will be redeemed. |
| Defeasance language | Shows whether credit exposure shifts from issuer pledge to escrow support. |
| Debt-service savings schedule | Separates real issuer savings from timing shifts and transaction costs. |