# What Is Advanced Refunding? Published: 2025-10-15 Author: Warren Team URL: https://www.heywarren.com/blog/advanced-refunding --- Before 2018, U.S. municipalities collectively saved over $12 billion annually by refinancing their long-term debts years ahead of schedule — a strategy called **advanced refunding** that Wall Street bond desks executed thousands of times per year. Then, overnight, Congress made the most powerful version of the tool illegal. Many investors and finance professionals confuse advanced refunding with ordinary bond refinancing. They assume it works the way a homeowner refinances a mortgage — pay off the old loan and take out a new one at a lower rate. The reality is more layered, and the confusion costs municipal bond investors and issuers real money every year. By the end of this article, you will understand exactly how advanced refunding works, why it mattered so profoundly to local governments, what the Tax Cuts and Jobs Act of 2017 changed, and what options remain for municipalities managing long-term debt today. You will also learn how to spot the difference between advanced refunding and current refunding — a distinction that affects bond pricing, tax treatment, and investment strategy in concrete ways. According to the Government Finance Officers Association, the 2018 tax law change effectively eliminated more than 90% of all tax-exempt advance refundings, representing a seismic shift in the $4 trillion municipal bond market. --- ## What Is Advanced Refunding? Advanced refunding is a debt-management technique in which a bond issuer — typically a state or local government — issues new bonds to refinance existing bonds more than 90 days before the existing bonds' first call date or maturity. The new bond proceeds are placed into an escrow account, invested in [U.S. Treasury](https://home.treasury.gov/) securities, and used to pay off the original bonds when they become callable or reach maturity. ![How new bond proceeds flow through an escrow to retire the original bonds at the call date.](data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%20660%20125%22%20width%3D%22660%22%20height%3D%22125%22%20role%3D%22img%22%3E%3Ctitle%3EFlow%20diagram%3C%2Ftitle%3E%3Crect%20width%3D%22100%25%22%20height%3D%22100%25%22%20fill%3D%22%23f8fafc%22%2F%3E%3Crect%20x%3D%2230%22%20y%3D%2225%22%20width%3D%22170%22%20height%3D%2275%22%20rx%3D%2210%22%20fill%3D%22white%22%20stroke%3D%22%232563eb%22%20stroke-width%3D%222%22%2F%3E%3Ctext%20x%3D%22115%22%20y%3D%2258.5%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2214%22%20font-weight%3D%22600%22%20fill%3D%22%230f172a%22%3ENew%20Bonds%20Issued%3C%2Ftext%3E%3Ctext%20x%3D%22115%22%20y%3D%2278.5%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2211%22%20fill%3D%22%2364748b%22%3ERefunding%20bonds%3C%2Ftext%3E%3Cline%20x1%3D%22205%22%20y1%3D%2262.5%22%20x2%3D%22237%22%20y2%3D%2262.5%22%20stroke%3D%22%2364748b%22%20stroke-width%3D%222%22%2F%3E%3Cpolygon%20points%3D%22244%2C62.5%20235%2C57.5%20235%2C67.5%22%20fill%3D%22%2364748b%22%2F%3E%3Crect%20x%3D%22245%22%20y%3D%2225%22%20width%3D%22170%22%20height%3D%2275%22%20rx%3D%2210%22%20fill%3D%22white%22%20stroke%3D%22%232563eb%22%20stroke-width%3D%222%22%2F%3E%3Ctext%20x%3D%22330%22%20y%3D%2258.5%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2214%22%20font-weight%3D%22600%22%20fill%3D%22%230f172a%22%3EEscrow%20Account%3C%2Ftext%3E%3Ctext%20x%3D%22330%22%20y%3D%2278.5%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2211%22%20fill%3D%22%2364748b%22%3ETreasury%20securities%3C%2Ftext%3E%3Cline%20x1%3D%22420%22%20y1%3D%2262.5%22%20x2%3D%22452%22%20y2%3D%2262.5%22%20stroke%3D%22%2364748b%22%20stroke-width%3D%222%22%2F%3E%3Cpolygon%20points%3D%22459%2C62.5%20450%2C57.5%20450%2C67.5%22%20fill%3D%22%2364748b%22%2F%3E%3Crect%20x%3D%22460%22%20y%3D%2225%22%20width%3D%22170%22%20height%3D%2275%22%20rx%3D%2210%22%20fill%3D%22white%22%20stroke%3D%22%232563eb%22%20stroke-width%3D%222%22%2F%3E%3Ctext%20x%3D%22545%22%20y%3D%2258.5%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2214%22%20font-weight%3D%22600%22%20fill%3D%22%230f172a%22%3EOld%20Bonds%20Paid%3C%2Ftext%3E%3Ctext%20x%3D%22545%22%20y%3D%2278.5%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2211%22%20fill%3D%22%2364748b%22%3EAt%20call%20date%3C%2Ftext%3E%3C%2Fsvg%3E) *How new bond proceeds flow through an escrow to retire the original bonds at the call date.* The 90-day threshold is the defining line between two types of refunding. Refinance within 90 days of the call date, and it's a **current refunding**. Go beyond that window, and it's an advanced refunding — with different legal rules, different tax treatment, and significantly higher complexity. ### The Escrow Account: The Engine of the Transaction When an issuer completes an advanced refunding, the new bond proceeds flow directly into a specially structured escrow account. A bank trustee holds this account and invests the funds in government securities whose interest and principal payments are timed to match the debt service on the old bonds exactly. This structure is called **defeasance**. Once the escrow is in place, the original bonds are considered legally defeased — the issuer is no longer obligated on them, even though the bonds haven't been retired yet. The escrow replaces the issuer's payment obligation entirely. The securities held in the escrow are typically: - **State and Local Government Series (SLGS) Treasuries**, issued by the U.S. Treasury specifically for this purpose - Open-market Treasury securities when SLGS are unavailable or less efficient - Sometimes a combination of both ### Why the Escrow Structure Matters Economically The escrow structure determines whether the [transaction](/blog/what-is-a-transactions) makes financial sense. The issuer now carries two sets of debt simultaneously — the old "refunded" bonds still outstanding and the new "refunding" bonds that funded the escrow. The deal only works if interest savings on the new bonds outweigh the cost of running the escrow for years. Bond advisors model this carefully, calculating **present value savings** — typically expressed as a percentage of the refunded bonds' par value. A deal generating less than 3% present value savings is often considered too thin to justify transaction costs, which can run $500,000 or more on a large deal. --- ## How the 90-Day Rule Defines Bond Advance Refunding The 90-day threshold is not arbitrary. It reflects a deliberate policy choice embedded in the U.S. Internal Revenue Code, designed to balance the benefit of lower municipal borrowing costs against the federal tax revenue lost through tax-exempt bond interest. ![Illustrative timeline showing how an issuer locks in lower rates years before the call date.](data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%20800%20149%22%20width%3D%22800%22%20height%3D%22149%22%20role%3D%22img%22%3E%3Ctitle%3ETimeline%3C%2Ftitle%3E%3Crect%20width%3D%22100%25%22%20height%3D%22100%25%22%20fill%3D%22%23f8fafc%22%2F%3E%3Cline%20x1%3D%22120%22%20y1%3D%2255%22%20x2%3D%22680%22%20y2%3D%2255%22%20stroke%3D%22%23cbd5e1%22%20stroke-width%3D%223%22%2F%3E%3Ccircle%20cx%3D%22120%22%20cy%3D%2255%22%20r%3D%2224%22%20fill%3D%22white%22%20stroke%3D%22%23cbd5e1%22%20stroke-width%3D%222%22%2F%3E%3Ctext%20x%3D%22120%22%20y%3D%2260%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2215%22%20font-weight%3D%22700%22%20fill%3D%22%230f172a%22%3E1%3C%2Ftext%3E%3Ctext%20x%3D%22120%22%20y%3D%22101%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2212%22%20font-weight%3D%22600%22%20fill%3D%22%230f172a%22%3EBonds%20Issued%3C%2Ftext%3E%3Ctext%20x%3D%22120%22%20y%3D%22119%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2210%22%20fill%3D%22%2364748b%22%3Ee.g.%202005%3C%2Ftext%3E%3Ccircle%20cx%3D%22260%22%20cy%3D%2255%22%20r%3D%2224%22%20fill%3D%22white%22%20stroke%3D%22%23cbd5e1%22%20stroke-width%3D%222%22%2F%3E%3Ctext%20x%3D%22260%22%20y%3D%2260%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2215%22%20font-weight%3D%22700%22%20fill%3D%22%230f172a%22%3E2%3C%2Ftext%3E%3Ctext%20x%3D%22260%22%20y%3D%22101%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2212%22%20font-weight%3D%22600%22%20fill%3D%22%230f172a%22%3ERates%20Fall%3C%2Ftext%3E%3Ctext%20x%3D%22260%22%20y%3D%22119%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2210%22%20fill%3D%22%2364748b%22%3Ee.g.%202010%3C%2Ftext%3E%3Ccircle%20cx%3D%22400%22%20cy%3D%2255%22%20r%3D%2224%22%20fill%3D%22%232563eb%22%20stroke%3D%22%232563eb%22%20stroke-width%3D%223%22%2F%3E%3Ctext%20x%3D%22400%22%20y%3D%2260%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2215%22%20font-weight%3D%22700%22%20fill%3D%22white%22%3E3%3C%2Ftext%3E%3Ctext%20x%3D%22400%22%20y%3D%22101%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2212%22%20font-weight%3D%22600%22%20fill%3D%22%230f172a%22%3EAdvance%20Refunding%3C%2Ftext%3E%3Ctext%20x%3D%22400%22%20y%3D%22119%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2210%22%20fill%3D%22%2364748b%22%3ENew%20bonds%20%2B%20escrow%3C%2Ftext%3E%3Ccircle%20cx%3D%22540%22%20cy%3D%2255%22%20r%3D%2224%22%20fill%3D%22white%22%20stroke%3D%22%23cbd5e1%22%20stroke-width%3D%222%22%2F%3E%3Ctext%20x%3D%22540%22%20y%3D%2260%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2215%22%20font-weight%3D%22700%22%20fill%3D%22%230f172a%22%3E4%3C%2Ftext%3E%3Ctext%20x%3D%22540%22%20y%3D%22101%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2212%22%20font-weight%3D%22600%22%20fill%3D%22%230f172a%22%3ECall%20Date%3C%2Ftext%3E%3Ctext%20x%3D%22540%22%20y%3D%22119%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2210%22%20fill%3D%22%2364748b%22%3Ee.g.%202015%3C%2Ftext%3E%3Ccircle%20cx%3D%22680%22%20cy%3D%2255%22%20r%3D%2224%22%20fill%3D%22white%22%20stroke%3D%22%23cbd5e1%22%20stroke-width%3D%222%22%2F%3E%3Ctext%20x%3D%22680%22%20y%3D%2260%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2215%22%20font-weight%3D%22700%22%20fill%3D%22%230f172a%22%3E5%3C%2Ftext%3E%3Ctext%20x%3D%22680%22%20y%3D%22101%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2212%22%20font-weight%3D%22600%22%20fill%3D%22%230f172a%22%3EOld%20Bonds%20Retired%3C%2Ftext%3E%3Ctext%20x%3D%22680%22%20y%3D%22119%22%20text-anchor%3D%22middle%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2210%22%20fill%3D%22%2364748b%22%3EEscrow%20pays%20off%3C%2Ftext%3E%3C%2Fsvg%3E) *Illustrative timeline showing how an issuer locks in lower rates years before the call date.* Under [IRS](https://www.irs.gov/) regulations, a bond could only be advance refunded once on a tax-exempt basis. This **one-advance-refunding rule** prevented issuers from repeatedly refinancing debt every time interest rates dipped, which would have extended the federal tax subsidy indefinitely. ### Callable Bonds and the Interest Rate Opportunity Most municipal bonds are **callable** — the issuer can redeem them before maturity, typically after a 10-year no-call protection period. A bond issued in 2005 with a 30-year maturity and a 10-year call date becomes first callable in 2015. If rates fall sharply in 2010 — five years before that call date — a municipality that wants to lock in lower rates faces a real problem. It cannot call the bonds yet. Without advance refunding, it would have to wait until 2015, potentially watching that low-rate window close entirely. Advanced refunding solved this problem directly. The issuer could sell new bonds in 2010, park the proceeds in escrow, and legally commit to retiring the old bonds on the 2015 call date. Investors in the old bonds knew with certainty they'd be paid at the call date. The municipality locked in the lower rate five years early. ### Calculating Gross Savings vs. Present Value Savings Two metrics dominate any refunding analysis: 1. **Gross savings**: The total difference in debt service payments between the old bonds and the new bonds over the full life of the deal, with no time discounting. 2. **Present value savings**: The same cash flow difference, discounted back to today using the yield on the new refunding bonds. This is the number that actually drives decisions. Bond advisors benchmark present value savings against the par value of the refunded bonds. A $100 million refunding generating $5 million in present value savings achieves a 5% savings ratio — generally considered a solid transaction. --- ## Why Municipalities Relied on Tax-Exempt Advanced Refunding For decades, advance refunding was one of the most powerful tools in a public finance officer's toolkit. It allowed governments to manage debt proactively rather than reactively, capturing interest rate savings years before bonds could be called. Local governments operate under strict budget constraints that private-sector borrowers don't face. A school district with $200 million in outstanding bonds cannot buy back bonds in the open market or negotiate a private refinancing. Advanced refunding gave these issuers a structured, legally recognized mechanism to act when markets were favorable — on their schedule, not the market's. ### Locking In Historically Low Rates After 2008 After the 2008 financial crisis, the [Federal Reserve](https://www.federalreserve.gov/) held interest rates near zero for nearly seven years. Municipalities that had issued bonds in the early 2000s at 5% to 6% coupon rates found themselves carrying expensive debt in a 2% to 3% interest rate environment. Advanced refunding allowed them to capture those savings even when the bonds weren't yet callable. A city that issued 30-year bonds in 2003 at a 5.5% coupon could advance refund them in 2011 at 3.1%, freeing millions of dollars in annual interest — money redirected to schools, roads, and public safety budgets. ### Reducing Budget Uncertainty Through Locked-In Debt Service Advanced refunding also served a planning function that mattered to budget officers. By locking in future debt service payments at known levels years in advance, finance offices could build multi-year budgets with far greater certainty. An escrow account guaranteed the outcome regardless of future interest rate movements. This mattered especially for smaller governments — rural counties, water districts, school boards — that lacked sophisticated treasury operations and couldn't afford to bet their budgets on rate forecasts. --- ## The Tax Cuts and Jobs Act of 2017: End of an Era The passage of the Tax Cuts and Jobs Act in December 2017 fundamentally changed the advanced refunding landscape. Effective January 1, 2018, the TCJA eliminated the tax-exempt status of interest on bonds issued to advance refund existing tax-exempt municipal bonds. ![The TCJA eliminated tax-exempt advance refundings, projected to generate $17.4B in federal revenue over 10 years versus the $12B+ in annual municipal savings under the old law.](data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%20800%20210%22%20width%3D%22800%22%20height%3D%22210%22%20role%3D%22img%22%3E%3Ctitle%3EComparison%3C%2Ftitle%3E%3Crect%20width%3D%22100%25%22%20height%3D%22100%25%22%20fill%3D%22%23f8fafc%22%2F%3E%3Ctext%20x%3D%22230%22%20y%3D%2257.5%22%20text-anchor%3D%22end%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2214%22%20font-weight%3D%22600%22%20fill%3D%22%230f172a%22%3EMunicipal%20Savings%20%28annu%E2%80%A6%3C%2Ftext%3E%3Crect%20x%3D%22240%22%20y%3D%2225%22%20width%3D%22310.3448275862069%22%20height%3D%2255%22%20rx%3D%226%22%20fill%3D%22%232563eb%22%2F%3E%3Ctext%20x%3D%22562.344827586207%22%20y%3D%2257.5%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2214%22%20font-weight%3D%22700%22%20fill%3D%22%232563eb%22%3E%24B12%3C%2Ftext%3E%3Ctext%20x%3D%22230%22%20y%3D%22152.5%22%20text-anchor%3D%22end%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2214%22%20font-weight%3D%22600%22%20fill%3D%22%230f172a%22%3EFederal%20Revenue%20Gain%20%281%E2%80%A6%3C%2Ftext%3E%3Crect%20x%3D%22240%22%20y%3D%22120%22%20width%3D%22450%22%20height%3D%2255%22%20rx%3D%226%22%20fill%3D%22%237c3aed%22%2F%3E%3Ctext%20x%3D%22702%22%20y%3D%22152.5%22%20font-family%3D%22system-ui%2C-apple-system%2Csans-serif%22%20font-size%3D%2214%22%20font-weight%3D%22700%22%20fill%3D%22%237c3aed%22%3E%24B17%3C%2Ftext%3E%3C%2Fsvg%3E) *The TCJA eliminated tax-exempt advance refundings, projected to generate $17.4B in federal revenue over 10 years versus the $12B+ in annual municipal savings under the old law.* In plain English: after 2017, you can still execute an advanced refunding — but the new bonds will be **taxable**. Taxable bonds require higher interest rates, which eliminates most or all of the economic benefit for most transactions. ### Why Congress Targeted Tax-Exempt Advance Refundings The rationale was straightforward: tax-exempt advanced refunding cost the federal government significant revenue. Every new set of tax-exempt refunding bonds extended the federal tax subsidy for debt that already carried a tax-exempt subsidy on the old bonds. The Joint Committee on Taxation estimated that eliminating advance refundings would generate approximately $17.4 billion in federal revenue over 10 years — making it an attractive budget offset during the TCJA's drafting process. ### What Strategies Replaced Advanced Refunding Post-2017 The elimination of tax-exempt advanced refunding forced municipal finance professionals to adapt quickly. Several approaches have emerged: - **Taxable advanced refunding**: Issuers can still advance refund using taxable bonds. This makes economic sense only when the interest rate spread between old and new bonds is very wide — generally 200 [basis points](/blog/basis-points) or more. - **Current refunding**: Issuers now plan more carefully around call dates, waiting for the 90-day window to execute current refundings that maintain tax-exempt status. - **Shorter call protection on new issues**: New bonds are increasingly structured with 7-year call protection instead of 10-year, giving issuers more flexibility for future tax-exempt current refundings. - **Forward delivery bonds**: An evolving structure that locks in today's interest rates for bonds delivered on the call date, approximating the rate-lock benefit of an advanced refunding within a current-refunding framework. --- ## Advanced Refunding vs. Current Refunding: Key Differences Understanding the line between advanced refunding and current refunding is essential for anyone analyzing municipal bonds, evaluating debt management plans, or simply building a clearer picture of how public finance works. | Feature | Advanced Refunding | Current Refunding | |---|---|---| | Timing before call/maturity | More than 90 days | Within 90 days | | Tax-exempt status (post-2017) | No | Yes | | Escrow required | Yes | Not always | | Permitted frequency (pre-2018) | Once per bond | Unlimited | | Complexity and cost | Higher | Lower | | Dual debt on balance sheet | Yes, temporarily | Rarely | ### The Double-Barreled Debt Challenge One underappreciated aspect of advance refunding is the **double-barreled debt** problem. During the window between issuance of the refunding bonds and retirement of the refunded bonds — which can span several years — both sets of bonds appear on the issuer's balance sheet. This affects credit analysis. Rating agencies like Moody's and S&P examine total debt burden as part of their assessment. A municipality mid-way through an advanced refunding transaction appears to carry roughly twice the debt it actually owes economically, since the escrow guarantees the old bonds' payment. Experienced municipal credit analysts adjust for this, but less seasoned investors sometimes misread the balance sheet without understanding the escrow's role. Bond offering documents include disclosures about outstanding defeased debt precisely to address this issue. --- ## Common Mistakes and Misconceptions in Bond Refunding Even experienced finance professionals make errors when evaluating or executing refunding transactions. Understanding the most common pitfalls saves real money and avoids legal complications. ### Mistake 1: Reporting Gross Savings Instead of Net Savings Refunding transactions carry substantial fees: [underwriting](/blog/what-is-underwriting) spreads, bond counsel fees, financial advisor fees, trustee fees, and verification agent fees. These costs commonly total $500,000 to $2 million on large transactions. A deal showing $3 million in present value savings that costs $1.8 million in fees generates only $1.2 million in **[net present value](/blog/calculation-of-net-present-value-formula) savings** — a far less compelling outcome. The net number is the only one that measures actual benefit to taxpayers. ### Mistake 2: Confusing Defeasance with Bond Retirement When bonds are legally defeased through an advanced refunding, they are not retired. They remain outstanding securities until the call date or maturity. This has practical consequences: - **Continuing disclosure obligations**: The issuer must still file annual financial reports with EMMA (the MSRB's Electronic Municipal Market Access platform) until the bonds are actually called. - **Bond insurance**: If the old bonds carry insurance, that insurance remains in effect through the escrow period. - **Investor relations**: Holders of the defeased bonds receive payments from the escrow trustee, not the issuer — a distinction that occasionally causes confusion for individual investors. ### Mistake 3: Dismissing Taxable Advanced Refunding by Default Post-2017, many practitioners reflexively dismiss taxable advanced refunding without running the numbers. This is a mistake. In high-interest-rate environments — or when an issuer carries bonds from a significantly higher rate era — the spread between old coupon rates and current taxable rates can still generate meaningful net savings. Each situation requires fresh analysis rather than categorical rejection. --- ## Authoritative Sources For deeper background and primary-source data on this topic, the following authoritative sources are useful starting points: - [SEC](https://www.sec.gov/) - [Consumer Financial Protection Bureau](https://www.consumerfinance.gov/) - [Bureau of Labor Statistics](https://www.bls.gov/) ## Conclusion Advanced refunding reshaped how American state and local governments managed long-term debt for decades, allowing them to capture lower interest rates years before bonds could be called. The Tax Cuts and Jobs Act of 2017 eliminated the tax-exempt version of the strategy, closing a chapter in public finance history and forcing the field to innovate. Here are the key takeaways: - **Advanced refunding** refinances outstanding bonds more than 90 days before their call date, using an escrow of Treasury securities to guarantee payment of the original bonds. - The escrow creates **legal defeasance** — once in place, the issuer is no longer directly obligated on the old bonds, though those bonds remain outstanding. - For decades, tax-exempt advanced refunding saved municipalities billions annually by locking in falling interest rates years before call dates arrived. - The TCJA eliminated tax-exempt advanced refunding effective January 1, 2018, shifting the field toward current refundings, taxable structures, and forward delivery bonds. - **[Net present value](/blog/how-to-calculate-npv) savings** — after all transaction costs — is the only metric that determines whether any refunding deal genuinely benefits taxpayers. The municipal bond market has adapted to life without tax-exempt advance refunding, but understanding this strategy remains essential for anyone making sense of existing municipal debt, evaluating historical bond transactions, or planning future issuances in a changing rate environment. Ready to put this knowledge to work? Try Warren, your AI financial advisor — get personalized, conflict-free guidance at heywarren.com