Advanced Refunding
Advanced refunding is a municipal bond strategy where a government entity issues new bonds to refinance existing debt, but places the proceeds from the new issue into an escrow account rather than immediately retiring the old bonds. The escrow account—typically funded with U.S. Treasury securities—generates enough income to pay off the original bonds at their call date or maturity. This technique allows issuers to lock in lower interest rates while keeping the original bonds outstanding for years, effectively giving them a "second life" of debt service funded by the escrow.
SHORT DEFINITION
Advanced refunding is a municipal bond strategy where a government entity issues new bonds to refinance existing debt, but places the proceeds from the new issue into an escrow account rather than immediately retiring the old bonds. The escrow account—typically funded with U.S. Treasury securities—generates enough income to pay off the original bonds at their call date or maturity. This technique allows issuers to lock in lower interest rates while keeping the original bonds outstanding for years, effectively giving them a "second life" of debt service funded by the escrow.
WHAT IT IS
Advanced refunding is a refinancing tool used primarily by municipalities, state governments, and other tax-exempt bond issuers. Unlike a "current refunding"—where old bonds are retired within 90 days of the new issue—an advanced refunding involves placing the refinancing proceeds into an escrow portfolio that pays debt service on the original bonds until their call date or final maturity. The original bonds can remain outstanding for months or even years after the new bonds are issued.
The practice became widespread after the Tax Reform Act of 1986, which eliminated the ability of most issuers to advance-refund their tax-exempt debt more than once. Under current federal tax law (IRC §149(d)), a tax-exempt bond generally can only be advance-refunded once. This "one-bang" rule means issuers must time their advance refundings carefully, typically waiting until interest rates have dropped significantly—often by 100 to 200 basis points or more—to justify the transaction.
Advance refundings are particularly attractive because they allow issuers to lock in today's lower rates on debt that won't be callable for years. For example, a city that issued 30-year bonds at 5% in 2015 but can't call them until 2025 could advance-refund in 2024 at 3.5%, capturing roughly 150 basis points of annual savings for the remaining term. The escrow account, invested in State and Local Government Series (SLGS) Treasury securities, is structured to generate exactly enough coupon and principal payments to retire the old bonds at the call date.
HOW IT WORKS
The process begins when an issuer identifies outstanding bonds that are callable in the future and determines that current interest rates make refinancing economically viable. The issuer's financial advisor runs a "savings analysis" comparing the remaining debt service on the old bonds against the cost of issuing new bonds plus the escrow requirements. A common threshold is achieving at least 3% to 5% present value savings on the refunded bonds to justify the transaction costs, which typically run 2% to 4% of the new issue's par amount.
Once the decision is made, the issuer sells new bonds at current market rates. The proceeds are directed to an escrow agent—usually a large trust bank—who purchases a portfolio of U.S. Treasury securities (often SLGS, which are special-issue Treasuries sold to state and local governments at controlled yields). The escrow portfolio is structured so that its cash flows precisely match the debt service requirements of the old bonds through their call date. At the call date, the escrow liquidates, the old bonds are retired, and the new bonds become the issuer's sole obligation.
The verification agent—typically a certified public accounting firm—confirms that the escrow contains sufficient funds to make all remaining payments on the refunded bonds. This verification is a legal requirement for tax-exempt advance refundings. The entire transaction must comply with IRS arbitrage regulations, meaning the escrow yield generally cannot exceed the yield on the new bonds. If it does, the issuer must rebate the excess to the federal government, which would erode the economic benefit of the refunding.
PRACTICAL EXAMPLE
Consider the City of Riverside, which in 2018 issued $50 million in 30-year general obligation bonds at a 4.25% coupon, callable in 2028. By late 2023, interest rates for comparable 5-year municipal bonds have dropped to 2.75%. The city's financial advisor calculates that advance-refunding the remaining $46 million in outstanding principal would generate approximately $3.2 million in net present value savings over the remaining five years—roughly 7% of the refunded par amount, well above the 5% threshold.
The city issues $44 million in new refunding bonds at 2.75%, generating approximately $45.5 million in proceeds after original issue discount and costs. That amount goes into an escrow account invested in SLGS Treasuries yielding approximately 2.65%. The escrow is structured to pay the 4.25% coupon on the old bonds each year and redeem them at par on the 2028 call date. The city locks in roughly $760,000 in annual debt service savings, and the old bondholders have no change to their cash flows—they simply receive payments from the escrow rather than the city directly.
WHY IT MATTERS
For municipal issuers, advance refunding is one of the most powerful tools in public finance. It allows governments to reduce debt service costs without altering the experience of existing bondholders, who continue to receive their contracted payments from the escrow. The savings can be redirected to infrastructure, public services, or rainy-day funds. In a low-rate environment, advance refundings can collectively save state and local governments billions of dollars annually.
For investors, advance refunding changes the risk profile of their holdings. Once a bond is advance-refunded, it becomes essentially a U.S. Treasury-backed obligation—the credit risk of the municipality is replaced by the full faith and credit of the U.S. government. This "pre-refunded" status typically causes the bond's price to rise, as it now carries the highest credit quality available. However, investors who bought at lower yields may face reinvestment risk when the bonds are called, forcing them to redeploy capital in a lower-rate environment.
LIMITATIONS AND RISKS
The single most important limitation is the one-time advance refunding rule under current tax law. Once a tax-exempt bond has been advance-refunded, it cannot be advance-refunded again. This means issuers who miss the optimal rate window—or who advance-refund too early—cannot correct the mistake. Many issuers in the early 2000s advance-refunded at historically low rates, only to see rates fall further after 2008, but were locked out of additional savings.
There are also meaningful transaction costs: underwriter discounts, legal fees, verification agent fees, escrow agent fees, and rating agency charges can total $15 to $30 per $1,000 of refunded bonds. For smaller issues—say, under $10 million—these fixed costs can consume a disproportionate share of the savings. Additionally, if interest rates rise between the time the advance refunding is planned and the bonds are actually sold, the projected savings can evaporate entirely, forcing issuers to abandon the transaction or accept minimal benefit.
FAQ
What's the difference between current refunding and advance refunding?
A current refunding retires the old bonds within 90 days of issuing the new ones. An advance refunding keeps the old bonds outstanding for longer—sometimes years—while the new proceeds sit in an escrow account. Current refundings can be done multiple times; advance refundings of tax-exempt bonds are limited to once under federal tax law.
Do bondholders lose money when their bonds are advance-refunded?
No. Bondholders continue to receive their full coupon payments and principal at the call date, just from the escrow account instead of the issuer directly. In fact, the bonds typically appreciate in market value because they become backed by U.S. Treasuries. The main downside for investors is reinvestment risk—they must find new investments in what is often a lower-rate environment.
Can a private activity bond be advance-refunded on a tax-exempt basis?
Generally, no. Under IRC §149(d)(3), advance refundings of private activity bonds lose their tax-exempt status unless they meet very narrow exceptions. Most private activity bonds are advance-refunded on a taxable basis, which changes the economics significantly and typically requires a larger rate differential to justify the transaction.
BOTTOM LINE
Advance refunding is a strategic refinancing tool that lets municipal issuers lock in lower interest rates on debt that won't be callable for years, using an escrow account to bridge the timing gap. The key to success is timing the market correctly—waiting for a meaningful rate drop of at least 100 to 200 basis points—and ensuring the present value savings exceed the
Which related MoneyBestPal guides should you read?
Use this topic as part of a wider finance toolkit. Related areas to review include:
Educational disclaimer: This MoneyBestPal article is for general financial education only. It is not investment, tax, legal, or accounting advice. Consider speaking with a qualified professional before making decisions based on your personal situation.
