What Is a VRDO? Variable Rate Demand Obligations, Resets, and Risks

A variable rate demand obligation is a long-term municipal bond whose interest rate resets on a short-term schedule and whose holders can sell it back to the issuer at face value on short notice. VRDOs typically carry nominal maturities of 20 to 30 years, but the combination of frequent rate resets and a built-in put option makes them behave like short-term cash instruments for the people who own them.¹ That dual nature is the point. Public entities borrow for decades at rates closer to short-term levels, and investors get liquidity and capital protection that a traditional 30-year bond would never offer.

What a VRDO Is

A VRDO is a floating-rate debt instrument issued by a state, county, city, public authority, or similar municipal entity. Proceeds usually fund large capital projects such as highways, water systems, or public buildings. The principal is fixed, but the interest rate changes on a recurring schedule so each payment reflects current market conditions rather than the rate that prevailed on the day of issuance.¹

Because the rate adjusts frequently, the market price of a VRDO stays very close to par. A traditional fixed-rate bond loses value when rates rise and gains value when rates fall; a VRDO sidesteps most of that volatility by repricing itself. For the issuer, this generally means lower borrowing costs under a normal yield curve, when short-term rates sit below long-term ones. When the curve inverts, that advantage disappears or reverses.

Most VRDOs are structured as multi-modal securities, meaning the issuer can convert the bond from one rate mode to another during its life. An issuer might start in weekly variable-rate mode and later switch to a fixed rate if long-term rates drop enough to lock in savings.

How the Interest Rate Resets

The reset schedule is written into the bond indenture. Weekly resets are the most common arrangement, though daily, monthly, and semi-annual schedules exist as well.¹ At each reset the remarketing agent sets a new rate calculated to keep the bond trading at par. If comparable tax-exempt short-term rates have climbed, the VRDO rate goes up; if they’ve dropped, it goes down.

The primary benchmark is the SIFMA Municipal Swap Index, a weekly index composed of high-grade tax-exempt VRDOs. SIFMA publishes it as a standardized floating rate that the broader market uses as a reference point for swap transactions and variable-rate pricing.² As of early 2026, the index has been running in the range of roughly 2% to 3%, though it moves weekly and can shift meaningfully when the Federal Reserve adjusts monetary policy or when tax-exempt supply fluctuates around dates like April 15.

Each bond’s indenture typically directs the remarketing agent to set the lowest rate that will attract enough buyers to clear the market at par. That rate doesn’t need to match the SIFMA index exactly. It reflects the specific issuer’s credit quality, the strength of the liquidity facility backing the bonds, and the supply of competing short-term tax-exempt paper at that moment.

The Demand Feature

The “demand” in a variable rate demand obligation refers to the investor’s right to put the bond back to the issuer at par plus accrued interest. For weekly-mode VRDOs, this requires giving seven days’ written notice to the tender agent. Once that notice period expires the tender becomes irrevocable and the investor receives payment at face value.¹ Daily-mode VRDOs can be put on any business day. Some structures allow quarterly or semi-annual tenders.

This put option is what turns a 20- or 30-year bond into a cash-like instrument. An investor holding a weekly VRDO effectively owns something with a seven-day horizon. If rates spike or the investor needs cash, they can exit at par without waiting for the secondary market to find a bid. The protection runs both ways. Frequent resets prevent the price decline that would hurt a traditional bondholder in a rising-rate environment, and the put provides an unconditional exit at full value regardless of market conditions.

Mandatory Tenders

Certain events force all bondholders to tender their VRDOs whether they want to or not. The most common triggers are expiration or termination of the credit or liquidity facility backing the bonds, a default by the issuer under the credit agreement, and a decision by the issuer to convert the bonds from one interest-rate mode to another. When a mandatory tender occurs, every outstanding VRDO must be submitted for purchase and the bonds are remarketed under whatever new arrangement replaces the old one.

Mode conversions change the fundamental terms of the investment. If an issuer switches from weekly variable-rate mode to a fixed rate, the resulting bond is a completely different security. Bondholders who want to stay in a variable-rate instrument simply decline to repurchase the remarketed bonds and move on.

Remarketing Agents and Liquidity Providers

Two intermediaries keep the VRDO market running: the remarketing agent and the liquidity provider. They do different jobs, and the distinction matters when things go wrong.

The Remarketing Agent

The remarketing agent is usually an investment bank or broker-dealer responsible for setting the interest rate at each reset and finding new buyers for any bonds that get tendered. When an investor exercises the put, the remarketing agent tries to resell those bonds to a different investor at the newly reset rate. If that works, the transaction is seamless: the departing investor gets paid, a new investor steps in, and the issuer’s cash reserves are never touched. The remarketing agent has no obligation to buy the bonds itself if it can’t find a buyer.

The Liquidity Provider

The liquidity provider is the financial backstop. When the remarketing agent fails to find new buyers, a bank steps in to purchase the tendered bonds with its own money so that departing investors still receive par plus accrued interest. This guarantee typically takes one of two forms: a Letter of Credit or a Standby Bond Purchase Agreement.

A Letter of Credit is the stronger protection. The bank makes an unconditional commitment to pay principal and interest even if the issuer defaults or goes bankrupt. A Standby Bond Purchase Agreement is more limited. The bank agrees to purchase tendered bonds as long as the agreement remains in effect, but the obligation is conditional and can be terminated by specific events, such as a downgrade of the issuer or the bank itself below investment grade. Unlike a Letter of Credit, a Standby Bond Purchase Agreement does not guarantee that principal and interest will be paid in all circumstances.¹

Risks to Know

VRDOs sit among the safer instruments in the municipal market, but they aren’t risk-free. The main risks all trace back to the same structural feature: the bond depends on third parties continuing to do their jobs.

Remarketing Failure

If the remarketing agent can’t find new buyers for tendered bonds, the tender agent draws on the liquidity facility to pay departing investors. The bonds then sit with the liquidity provider bank, and the interest rate typically jumps to a higher “bank rate” specified in the bond documents until the bonds can be successfully remarketed.¹ For investors who already tendered, the failure is largely invisible because the liquidity facility paid them out. For investors who held through the failed remarketing, the bonds may become illiquid and hard to sell on the secondary market.

Liquidity Provider Credit Risk

A VRDO’s credit rating typically tracks the rating of the bank providing the liquidity facility rather than the underlying issuer, so a downgrade of the bank can directly lower the bond’s rating and push its yield higher.¹ If the bank drops below investment grade, a Standby Bond Purchase Agreement may terminate entirely, leaving bondholders with a long-term municipal credit that suddenly has no liquidity backstop.

What 2008 Showed

The 2008 credit crisis demonstrated what happens when liquidity providers come under stress. The closely related auction rate securities market collapsed when broker-dealers stopped supporting failed auctions, and some issuers saw borrowing costs spike from around 4% to as high as 20% overnight.³ VRDOs held up better because their Letter of Credit and Standby Bond Purchase Agreement structures provided a contractual backstop that auction rate securities lacked. The crisis still showed that the model depends on the banking system’s willingness and ability to honor liquidity commitments.

Who Buys VRDOs

The market is dominated by institutional investors, particularly tax-exempt money market funds. Under SEC Rule 2a-7, these funds can treat a VRDO’s maturity as the shorter of the next rate-reset date or the next put date rather than the bond’s nominal 20- or 30-year maturity.⁴ A weekly VRDO therefore counts as a seven-day instrument for portfolio maturity calculations.

Beyond money market funds, the typical buyer list includes bank trust departments, bond funds, corporate treasury operations, and high-net-worth individuals. VRDOs trade in $100,000 increments, which prices out most retail investors.¹ Individual investors who want VRDO exposure generally get it indirectly through a money market fund or municipal bond fund.

Tax Treatment

Interest on VRDOs issued by state and local governments is generally excluded from federal gross income under Section 103 of the Internal Revenue Code, just like interest on any other qualifying municipal bond.⁵ For investors in high federal brackets, that exclusion can produce an after-tax yield that beats taxable alternatives. Residents of the issuing state often avoid state income tax on the interest as well, though this reciprocity varies and some states tax interest from bonds issued by other states.

Private Activity Bonds and the AMT

Not every VRDO carries a clean tax exemption. When bond proceeds fund projects that primarily benefit private entities, the bonds may be classified as private activity bonds. Interest on these specified private activity bonds is treated as a tax preference item under Section 57 of the Internal Revenue Code, meaning it gets added back to income when calculating the alternative minimum tax.⁶

This matters more in 2026 than in recent years. The Tax Cuts and Jobs Act raised the AMT exemption amounts starting in 2018, pushing most individual taxpayers out of AMT territory. Those higher exemptions are scheduled to expire at the end of 2025, so the 2026 tax year reverts to much lower thresholds. More investors will find themselves subject to AMT, and anyone holding private activity VRDOs needs to factor that interest into the calculation. The official statement for each issue will specify whether the interest is subject to this treatment.

The 501(c)(3) Carve-Out

Bonds issued on behalf of 501(c)(3) nonprofit organizations such as hospitals and universities are excluded from the definition of private activity bonds for AMT purposes, even though they technically serve a private entity.⁶ Interest on these bonds does not trigger the AMT preference. Hospitals and universities are among the heaviest users of VRDOs, so this exception covers a meaningful share of the market.

1
Municipal Securities Rulemaking Board. About Municipal Variable Rate Securities
2
Securities Industry and Financial Markets Association (SIFMA). About The Municipal Swap Index
3
Federal Reserve Bank of Chicago. Explaining the Decline in the Auction Rate Securities Market
4
eCFR. 17 CFR 270.2a-7 – Money Market Funds
5
Office of the Law Revision Counsel. 26 USC 103 – Interest on State and Local Bonds
6
Office of the Law Revision Counsel. 26 USC 57 – Items of Tax Preference