FTABX vs. TAXF

Last updated Jun 4, 2026

FTABX (Fidelity Tax-Free Bond Fund) and TAXF (American Century Diversified Municipal Bond ETF) are both Municipal Bonds funds. Over the past 5 years, FTABX returned 1.04%/yr vs 1.07%/yr for TAXF. A 0.64 correlation means they provide meaningful diversification when combined. FTABX charges 0.25%/yr vs 0.29%/yr for TAXF.

Performance

FTABX vs. TAXF - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Fidelity Tax-Free Bond Fund (FTABX) and American Century Diversified Municipal Bond ETF (TAXF). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, FTABX achieves a 1.61% return, which is significantly lower than TAXF's 1.96% return.

FTABX

• 1D: 0.18%
• 1M: 0.82%
• YTD: 1.61%
• 6M: 1.99%
• 1Y: 7.77%
• 3Y*: 4.46%
• 5Y*: 1.04%
• 10Y*: 2.38%

TAXF

• 1D: -0.01%
• 1M: 0.82%
• YTD: 1.96%
• 6M: 2.23%
• 1Y: 8.33%
• 3Y*: 4.23%
• 5Y*: 1.07%
• 10Y*: —

*Multi-year figures are annualized to reflect compound growth (CAGR)

FTABX vs. TAXF - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018
FTABX Fidelity Tax-Free Bond Fund	1.61%	5.60%	1.54%	7.51%	-10.74%	2.20%	4.80%	8.58%	1.65%
TAXF American Century Diversified Municipal Bond ETF	1.96%	4.30%	1.74%	7.33%	-9.64%	2.72%	5.55%	8.75%	0.64%

Correlation

The correlation between FTABX and TAXF is 0.60, which is moderate. They share some common price drivers but move independently often enough to provide real diversification benefit when combined.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.60
Correlation (3Y) Calculated over the trailing 3-year period	0.64
Correlation (5Y) Calculated over the trailing 5-year period	0.67
Correlation (All Time) Calculated using the full available price history since Sep 13, 2018	0.64

The correlation between FTABX and TAXF has been stable across timeframes, ranging from 0.60 to 0.67 - a consistent structural relationship.

Return for Risk

FTABX vs. TAXF — Risk / Return Rank

Compare risk-adjusted metric ranks to identify better-performing investments over the past 12 months.

FTABX

FTABX Risk / Return Rank: 70
FTABX Sharpe Ratio Rank: 86
FTABX Sortino Ratio Rank: 90
FTABX Omega Ratio Rank: 93
FTABX Calmar Ratio Rank: 43
FTABX Martin Ratio Rank: 40

TAXF

TAXF Risk / Return Rank: 76
TAXF Sharpe Ratio Rank: 83
TAXF Sortino Ratio Rank: 87
TAXF Omega Ratio Rank: 90
TAXF Calmar Ratio Rank: 58
TAXF Martin Ratio Rank: 59

The rank (0–100) shows how this investment's returns compare to the risk taken. Higher = better. Based on the past 12 months of data, combining Sharpe, Sortino, and other metrics used by quantitative funds and institutional investors.

FTABX vs. TAXF - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Fidelity Tax-Free Bond Fund (FTABX) and American Century Diversified Municipal Bond ETF (TAXF). 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.

	FTABX	TAXF	Difference
Sharpe ratio: Return per unit of total volatility	2.79	2.74	+0.06
Sortino ratio: Return per unit of downside risk	4.40	3.97	+0.43
Omega ratio: Gain probability vs. loss probability	1.69	1.59	+0.10
Calmar ratio: Return relative to maximum drawdown	2.48	2.86	-0.38
Martin ratio: Return relative to average drawdown	8.53	10.30	-1.78
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

FTABX vs. TAXF - Sharpe Ratio Comparison

The current FTABX Sharpe Ratio is 2.79, which is comparable to the TAXF Sharpe Ratio of 2.74. The chart below compares the historical Sharpe Ratios of FTABX and TAXF, calculated using daily returns over the previous 12 months. A higher Sharpe Ratio indicates better risk-adjusted performance relative to the risk-free rate.

Sharpe Ratios by Period

	FTABX	TAXF	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.79	2.74	+0.06
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.25	0.26	0.00
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.56	—	—
Sharpe Ratio (All Time) Calculated using the full available price history	1.05	0.62	+0.43

Drawdowns

FTABX vs. TAXF - Drawdown Comparison

The maximum FTABX drawdown since its inception was -16.14%, which is greater than TAXF's maximum drawdown of -13.93%. Use the drawdown chart below to compare losses from any high point for FTABX and TAXF.

Drawdown Indicators

	FTABX	TAXF	Difference
Max Drawdown Largest peak-to-trough decline	-16.14%	-13.93%	-2.21%
Max Drawdown (1Y) Largest decline over 1 year	-3.11%	-2.93%	-0.18%
Max Drawdown (3Y) Largest decline over 3 years	-5.99%	-5.53%	-0.46%
Max Drawdown (5Y) Largest decline over 5 years	-16.14%	-13.93%	-2.21%
Max Drawdown (10Y) Largest decline over 10 years	-16.14%	—	—
Current Drawdown Current decline from peak	-0.60%	-0.48%	-0.12%
Average Drawdown Average peak-to-trough decline	-2.12%	-3.14%	+1.02%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.90%	0.81%	+0.09%

Volatility

FTABX vs. TAXF - Volatility Comparison

Fidelity Tax-Free Bond Fund (FTABX) has a higher volatility of 1.09% compared to American Century Diversified Municipal Bond ETF (TAXF) at 0.99%. This indicates that FTABX's price experiences larger fluctuations and is considered to be riskier than TAXF based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	FTABX	TAXF	Difference
Volatility (1M) Calculated over the trailing 1-month period	1.09%	0.99%	+0.10%
Volatility (6M) Calculated over the trailing 6-month period	2.14%	2.24%	-0.10%
Volatility (1Y) Calculated over the trailing 1-year period	2.76%	3.05%	-0.29%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	4.16%	4.20%	-0.04%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	4.29%	4.65%	-0.36%

FTABX vs. TAXF - Expense Ratio Comparison

FTABX has a 0.25% expense ratio, which is lower than TAXF's 0.29% expense ratio.

Dividends

FTABX vs. TAXF - Dividend Comparison

FTABX's dividend yield for the trailing twelve months is around 3.21%, less than TAXF's 3.47% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
FTABX Fidelity Tax-Free Bond Fund	3.21%	4.18%	2.81%	2.90%	2.16%	2.27%	2.64%	2.94%	3.01%	3.49%	4.22%	3.29%
TAXF American Century Diversified Municipal Bond ETF	3.47%	3.68%	3.38%	2.93%	2.05%	1.58%	2.13%	2.64%	0.69%	0.00%	0.00%	0.00%

Frequently Asked Questions

Can I hold both FTABX and TAXF in my portfolio?

FTABX and TAXF have a correlation of 0.60, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, FTABX or TAXF?

FTABX has higher volatility (1.09%) compared to TAXF (0.99%). In terms of maximum drawdown, FTABX dropped -16.14% vs TAXF's -13.93%.

Which has better risk-adjusted returns?

FTABX currently has the higher Sharpe Ratio (2.79 vs 2.74), meaning it's delivered slightly more return per unit of risk over the trailing 12 months. However, this ranking shifts over time - use the Risk/Return Score above for a more comprehensive view that combines Sharpe, Sortino, and other measures used by quantitative funds.