How do I decide between municipal bonds and taxable bonds for a client?

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AcadiFi · Accepted Answer

The choice between municipal bonds (tax-exempt at federal level, often state-exempt if issued in the investor's state) and taxable bonds hinges on the taxable-equivalent yield calculation...

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Taxable-equivalent yield formula: TEY = muni_yield / (1 - t), where t is the investor's marginal federal tax rate (plus state if applicable for out-of-state munis).

Break-even tax rate: t* = 1 - (muni_yield / taxable_yield). Investors with marginal rates above t* benefit from munis; those below benefit from taxables.

Worked example: a 10-year AA municipal bond yields 3.2% tax-free while a 10-year AA corporate yields 4.8% taxable. Break-even = 1 - (3.2/4.8) = 33.3%. For Sienna Blackwood in the 37% federal bracket with 3.8% NIIT (effective 40.8% on investment income), munis win: TEY of muni = 3.2 / (1 - 0.408) = 5.41%, which exceeds the 4.8% corporate.

State tax impact: for in-state munis, add state tax rate to the formula. California resident in 37% federal + 13.3% state bracket has combined marginal rate approaching 50.3%. In-state CA muni yielding 3.0% has TEY = 3.0 / (1 - 0.503) = 6.04% — vastly outperforming taxable alternatives.

```mermaid
flowchart LR
  A[Muni Yield] --> B[÷ 1-t]
  B --> C[TEY]
  D[Taxable Yield] --> E[Compare]
  C --> E
  E --> F{Higher?}
```

Factors beyond break-even: (1) credit risk — municipals are generally high-grade but exposure to fiscal distress of specific issuers requires diversification; (2) liquidity — muni bid-ask spreads are wider than treasuries, especially for small retail lots; (3) AMT exposure — certain private activity munis are subject to Alternative Minimum Tax, effectively turning them into taxable bonds for high-income clients; (4) call features — many munis are callable, shortening effective duration; (5) insurance — post-2008, insurance adds less value than before.

For CFA Level III application: compute TEY for specific clients considering combined federal, state, and NIIT rates, then compare to taxable alternatives in matched credit and duration buckets. Clients below 24% federal bracket generally should not hold munis; clients above 35% typically should. The 24-35% range requires case-by-case analysis.

How do I decide between municipal bonds and taxable bonds for a client?

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