Tax Anticipation Note

A tax anticipation note (TAN) is a short-term promissory note issued by a municipality or state agency to bridge a gap between when it must spend cash and when tax revenue actually arrives. The note is repaid from the identified tax stream within a single fiscal year, making it a purely temporary financing tool rather than permanent debt.

The timing problem every government faces

Every tax authority knows its calendar. Property taxes come due in spring. Sales tax arrives monthly. Income tax is withheld and remitted on a schedule. Yet the bills—payroll, supplies, debt service—do not wait. A school district needs to pay teachers in September but doesn’t receive property tax revenue until October. A state collects income tax throughout the year but budgets spending from July. The gap between outflow and inflow is a real cash shortage, and the simplest solution is a tax anticipation note: borrow now on the promise to repay from the revenue you know is coming.

How TANs differ from general bonds

A municipal bond pledges the full faith and credit of the issuer and may be backed by multiple revenue streams or the taxing power itself. A TAN is far narrower: it pledges only a specific tax revenue—property tax, sales tax, income tax—and matures before that fiscal year ends. Most are issued in summer and redeemed by November. Some mature in as little as 60 days. The credit risk is not “can the city pay back anything?” but “will that specific tax revenue materialise on time?” Historically, it always does, which is why TANs trade at yields only slightly above Treasury bills.

The investor perspective

A fund manager or bank treasurer buying a TAN is making a simple bet: the municipality’s tax system works as advertised. This is not romantic; it is pedestrian. Property tax collection in New York City is far more certain than sales tax collection in a small rural county. But both are far more predictable than whether a corporation will meet earnings targets. Investors in TANs grade these odds carefully. A state with sluggish revenue growth or a history of late collections will pay higher rates. A wealthy suburb with reliable property tax will sell TANs at nearly Treasury rates plus maybe 10 basis points.

Maturity and repayment timing

TANs are intentionally short-dated. Most mature within 12 months; many within 6 months or even 90 days. When the tax revenue arrives, the issuer pays off the note in full. If collections slow (a rare event), the municipality might refinance by issuing a new TAN for another short tranche. But that is a sign of trouble—if done repeatedly, it signals the tax base is eroding or collections are dysfunctional. The beauty of the TAN is that it cannot linger; it forces repayment discipline and prevents municipalities from rolling short-term debt into a permanent fixture, as some do with other borrowing.

The math and yield calculation

TANs typically use a bank discount yield convention for very short maturities (under 6 months), though some use bond equivalent yield if they’re longer or traded more actively. A municipality in July might issue 120-day TANs at 5.40% discount yield. An investor buying $1 million face value would pay $1 million minus roughly $18,000 accrued discount, receiving full value 120 days later. The yield quoted is not the dollar return but the annualised percentage of face value. For a tax-bracket investor, the interest is typically exempt from federal (and often state and local) income tax, a subsidy that lowers the effective cost to the issuer and makes TANs attractive to high-income individuals and tax-exempt institutions.

When municipalities rely on TANs

In normal years, TANs are a minor blip in municipal finance—a small bridge between cash cycles. During recessions or deflation, they become critical. When sales tax plummets because consumers stop spending, a state cannot wait for recovery; it needs to pay workers and vendors now. TANs allow it to borrow in advance of a rebound, spreading the pain. Similarly, if property tax collections lag during a downturn (owners fall behind), the municipality can float a TAN against future collections when the economy stabilizes. The 2008 financial crisis saw heavy TAN issuance; the 2020 pandemic did as well.

The role of interest-rate risk

Because TANs mature so quickly, interest-rate risk is minimal. A three-month note will be paid off long before any significant rate move affects its value. But there is a subtle risk: if interest rates spike sharply before the note is issued, the municipality must pay more. A state planning a $100 million TAN issuance in August might budget 5% based on July readings, only to find rates have jumped to 6% by the time the cash is needed. This is rare but has happened in volatile years. Some issuers now issue TANs earlier in the year or in tranches to hedge timing risk.

Regulatory and accounting nuances

Accountants do not treat TAN interest as a permanent expenditure; it is a temporary financing charge. City budgets will often show TANs as “non-recurring” debt, distinct from long-term borrowing. Regulators care that municipalities do not abuse TANs—issuing them repeatedly or for amounts that dwarf actual tax gaps. A state that issues $5 billion in TANs to cover only $1 billion in timing mismatches is red-flagged as unsustainable. The SEC has brought enforcement actions against municipalities that disguise long-term deficits as short-term timing gaps.

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