A variable rate demand obligation, or VRDO, is a long-term municipal bond that behaves like a short-term investment: the interest rate resets on a short schedule (usually daily or weekly), and the holder has a standing right to sell the bond back at full face value on short notice. Stated maturities run twenty to thirty years, but between the frequent resets and the built-in exit, a VRDO trades more like a money market instrument than a traditional bond. State and local governments, public universities, and nonprofit hospitals use them to secure long-term financing while paying interest rates closer to short-term levels.
How the Rate Resets
The “variable rate” half of the name refers to the bond’s interest rate adjusting to current market conditions at set intervals. Most VRDOs reset weekly or daily, though monthly and other schedules exist.1Municipal Securities Rulemaking Board (MSRB). About Municipal Variable Rate Securities At each reset, the rate moves to whatever level keeps the bond trading at par. If prevailing rates rise, the VRDO’s next reset rises with them; if they fall, the reset drops.
A remarketing agent, typically a broker-dealer assigned to the issue, sets the specific rate for each period based on current demand and a market benchmark. The most common reference is the SIFMA Municipal Swap Index, a seven-day index built from actual reset rates on high-grade tax-exempt VRDOs.2Securities Industry and Financial Markets Association (SIFMA). About The Municipal Swap Index
Because the rate adjusts so often, the bond’s market price stays close to par. A fixed-rate bond loses value when interest rates rise; a VRDO sidesteps that by resetting into the new rate. This price stability is a large part of why institutional investors treat VRDOs as cash-equivalent holdings.
The Demand Feature
The “demand” half of the name is the feature that separates VRDOs from ordinary bonds. As a holder, you have an unconditional right to sell the bond back at par plus accrued interest.1Municipal Securities Rulemaking Board (MSRB). About Municipal Variable Rate Securities The right can be exercised for any reason.
To use it, you notify the bond’s tender agent a set number of days ahead of your exit date. For a weekly-reset VRDO, that notice window is commonly seven calendar days. Once the notice is in, you are entitled to your principal plus accrued interest on the settlement date. The put can generally be exercised at each rate reset, which ties the rate adjustment and the liquidity window together.1Municipal Securities Rulemaking Board (MSRB). About Municipal Variable Rate Securities
Frequent resets plus the put mean a thirty-year bond can be converted to cash within days. Practically, that leaves the investor with almost no interest rate risk and almost no price risk. The trade-off is yield: VRDOs pay less than comparable fixed-rate long-term bonds because you are giving up the chance to lock in a higher rate in exchange for flexibility and stability.
Who Backs the Put Option
The put only works if someone can pay you when you exercise it, and a municipal issuer rarely has millions of dollars of cash sitting ready to buy back tendered bonds. VRDOs therefore rely on third-party bank support, in one of two forms.
A Letter of Credit (LOC) is a commitment from a highly rated commercial bank to make interest and principal payments directly to investors, with the bank later seeking reimbursement from the issuer. The bank’s credit effectively replaces the issuer’s, which is why a VRDO backed by a strong LOC often carries the bank’s rating rather than the municipality’s.
A Standby Bond Purchase Agreement (SBPA) is a commitment from a bank to buy any tendered bonds the remarketing agent cannot resell. The bank purchases the bonds rather than making direct payments to investors, but the practical effect is the same: you get paid whether or not a new buyer shows up.1Municipal Securities Rulemaking Board (MSRB). About Municipal Variable Rate Securities
Issuers pay annual fees for these arrangements, and the perceived safety of the bond is only as strong as the bank behind it. If the bank providing the LOC or SBPA is downgraded, the VRDO’s rating typically drops as well.
When an investor tenders, the remarketing agent tries to place the bonds with a new buyer at the current reset rate. If that works, the outgoing investor is paid from the incoming investor’s purchase, and neither the issuer nor the bank spends a dollar. If it doesn’t, the liquidity provider steps in and buys. At that point the bonds are often reclassified as “bank bonds,” the interest rate may jump to a contractual maximum, and the issuer is usually required to repay the bank on an accelerated schedule rather than the original long-term timeline. This outcome is expensive for the issuer and signals credit stress, so both issuers and remarketing agents work hard to avoid it.
Who Actually Buys VRDOs
VRDOs are sold in denominations of $100,000, which puts direct ownership out of reach for most retail investors.1Municipal Securities Rulemaking Board (MSRB). About Municipal Variable Rate Securities The dominant buyers are money market funds and other institutional investors purchasing large blocks.
The reason money market funds are the largest holders comes down to how SEC Rule 2a-7 measures maturity. A long-term variable rate security with a demand feature is not treated as having its stated thirty-year maturity. Its regulatory maturity is the longer of the period until the next rate reset or the period until the put can be exercised.3eCFR. 17 CFR 270.2a-7 – Money Market Funds For a weekly-reset VRDO with a seven-day put, that’s seven days. That treatment lets money market funds reach into the long-term municipal market for tax-exempt yield without breaking their strict short-maturity rules.
If you want VRDO exposure as an individual investor, the practical route is usually a tax-exempt money market fund that holds them, not direct purchase.
Tax Treatment
Interest on most VRDOs is excluded from federal income tax because VRDOs are obligations of state or local governments under Internal Revenue Code Section 103.4Office of the Law Revision Counsel. 26 USC 103 – Interest on State and Local Bonds If you live in the state that issued the bond, the interest may also be exempt from state and local income taxes, though this varies. The stated yield looks low, but the after-tax yield is what makes VRDOs attractive to high-income investors and tax-sensitive institutions.
One exception matters if you are subject to the federal Alternative Minimum Tax. VRDOs issued as private activity bonds finance projects used primarily by private entities, such as certain airport terminals, housing developments, or industrial facilities. Interest on most private activity bonds issued after August 7, 1986, is a tax preference item for AMT purposes under IRC Section 57(a)(5).5Office of the Law Revision Counsel. 26 USC 57 – Items of Tax Preference Bonds issued by 501(c)(3) nonprofits and certain housing bonds are excluded from that AMT treatment. If AMT applies to you, check the bond’s classification before assuming the full tax benefit.
Risks to Weigh
The structural protections are strong but not absolute. Several exposures remain.
- Liquidity provider downgrade or non-renewal. The safety of the put depends on the LOC or SBPA bank. A downgrade of that bank typically pulls the VRDO’s rating down with it, and if the bank declines to renew when the facility expires, the issuer has to find a replacement or restructure the debt.
- Remarketing failure. When the liquidity provider has to buy tendered bonds, the bonds convert to bank bonds with higher rates and accelerated repayment. The investor still gets paid, but the issuer’s costs rise sharply, which can feed back into credit concerns.
- Falling-rate yield erosion. Because the rate resets to market, a declining rate environment cuts your yield at every reset. There is no locked-in rate to fall back on.
- Call risk. Most VRDOs include a call feature letting the issuer retire the bonds at par. Issuers are most likely to call when reset rates have climbed to a level where cheaper financing is available elsewhere.
- Issuer credit risk. The liquidity provider cushions short-term risk, but long-term repayment still depends on the issuer’s financial health. A municipality or hospital in fiscal distress may struggle with debt service or with securing a replacement liquidity facility when the current one expires.
How VRDOs Differ from Auction Rate Securities
VRDOs are sometimes confused with Auction Rate Securities (ARS), another variable-rate municipal instrument widely used before the 2008 financial crisis. Both reset their rates periodically, but they deliver liquidity in very different ways, and the difference mattered when markets came under stress.
An ARS sets its rate through a periodic auction among investors. If enough bidders show up, the rate resets and holders who want out can sell to incoming buyers. If the auction fails, holders are stuck: they cannot sell at par and must wait for a future successful auction, which may not come. ARS had no contractual backstop requiring anyone to purchase the bonds.
A VRDO solves that problem through the put option and the required liquidity provider. If the remarketing agent cannot find buyers, the LOC or SBPA bank is contractually obligated to purchase the bonds and the investor is paid at par. When the ARS market froze in 2008 as auctions failed in sequence, the VRDO market kept functioning because the liquidity backstop held and put rights could still be exercised.