TAXF vs. ZMUN
TAXF (American Century Diversified Municipal Bond ETF) and ZMUN (F/m Ultrashort Tax-Free Municipal ETF) are both Municipal Bonds funds. TAXF is actively managed, while ZMUN is passively managed. At a 0.17 correlation, their price movements are largely independent. TAXF charges 0.29%/yr vs 0.30%/yr for ZMUN.
Performance
TAXF vs. ZMUN - Performance Comparison
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Returns By Period
In the year-to-date period, TAXF achieves a 2.22% return, which is significantly higher than ZMUN's 1.78% return.
TAXF
- 1D
- 0.00%
- 1M
- 1.52%
- YTD
- 2.22%
- 6M
- 2.18%
- 1Y
- 7.39%
- 3Y*
- 3.96%
- 5Y*
- 1.13%
- 10Y*
- —
ZMUN
- 1D
- 0.01%
- 1M
- 0.31%
- YTD
- 1.78%
- 6M
- 1.87%
- 1Y
- —
- 3Y*
- —
- 5Y*
- —
- 10Y*
- —
TAXF vs. ZMUN - Yearly Performance Comparison
| 2026 (YTD) | 2025 | |
|---|---|---|
TAXF American Century Diversified Municipal Bond ETF | 2.22% | 1.58% |
ZMUN F/m Ultrashort Tax-Free Municipal ETF | 1.78% | 0.67% |
Correlation
The correlation between TAXF and ZMUN is 0.17, which is low. Their price movements are largely independent, making them effective diversification partners.
| Correlation | |
|---|---|
Correlation (All Time) Calculated using the full available price history since Sep 30, 2025 | 0.17 |
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Return for Risk
TAXF vs. ZMUN — Risk / Return Rank
TAXF
ZMUN
Risk / return metrics aren't available yet — we need at least 12 months of trading data to calculate them.
TAXF vs. ZMUN - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for American Century Diversified Municipal Bond ETF (TAXF) and F/m Ultrashort Tax-Free Municipal ETF (ZMUN). Risk-adjusted metrics are performance indicators that assess an investment's returns in relation to its risk, enabling a more accurate comparison of different investment options.
Values are calculated on a 1-year rolling basis and updated daily. Risk-adjusted metrics are more stable over longer periods — use the period switch above to explore them.
| TAXF | ZMUN | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | — | — | |
| Sortino ratioReturn per unit of downside risk | — | — | |
| Omega ratioGain probability vs. loss probability | 1.53 | — | — |
| Calmar ratioReturn relative to maximum drawdown | 2.53 | — | — |
| Martin ratioReturn relative to average drawdown | 9.09 | — | — |
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Drawdowns
TAXF vs. ZMUN - Drawdown Comparison
The maximum TAXF drawdown since its inception was -13.93%, which is greater than ZMUN's maximum drawdown of -0.10%. Use the drawdown chart below to compare losses from any high point for TAXF and ZMUN.
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Drawdown Indicators
| TAXF | ZMUN | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -13.93% | -0.10% | -13.83% |
Max Drawdown (1Y)Largest decline over 1 year | -2.93% | — | — |
Max Drawdown (3Y)Largest decline over 3 years | -5.53% | — | — |
Max Drawdown (5Y)Largest decline over 5 years | -13.93% | — | — |
Current DrawdownCurrent decline from peak | -0.22% | -0.02% | -0.20% |
Average DrawdownAverage peak-to-trough decline | -3.13% | -0.01% | -3.12% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 0.81% | — | — |
Volatility
TAXF vs. ZMUN - Volatility Comparison
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Volatility by Period
| TAXF | ZMUN | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 0.75% | — | — |
Volatility (6M)Calculated over the trailing 6-month period | 2.28% | — | — |
Volatility (1Y)Calculated over the trailing 1-year period | 3.00% | 0.54% | +2.46% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 4.20% | 0.54% | +3.66% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 4.64% | 0.54% | +4.10% |
TAXF vs. ZMUN - Expense Ratio Comparison
TAXF has a 0.29% expense ratio, which is lower than ZMUN's 0.30% expense ratio.
Dividends
TAXF vs. ZMUN - Dividend Comparison
TAXF's dividend yield for the trailing twelve months is around 3.76%, more than ZMUN's 2.28% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 |
|---|---|---|---|---|---|---|---|---|---|
TAXF American Century Diversified Municipal Bond ETF | 3.76% | 3.68% | 3.38% | 2.93% | 2.05% | 1.58% | 2.13% | 2.64% | 0.69% |
ZMUN F/m Ultrashort Tax-Free Municipal ETF | 2.28% | 0.70% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% |
Frequently Asked Questions
TAXF and ZMUN have a correlation of 0.17, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.
On fees, TAXF is cheaper at 0.29% per year. The better choice depends on whether you care most about return, fees, risk, or income.
TAXF is cheaper with a 0.29% expense ratio, compared with 0.30% for ZMUN.
TAXF has the higher dividend yield at 3.76%, compared with 2.28% for ZMUN.
They also come from different issuers: American Century and F/m Investments. Their fees differ too: 0.29% for TAXF and 0.30% for ZMUN.
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