DFABX vs. COLTX

Last updated Jun 23, 2026

DFABX (DFA Short-Term Selective State Municipal Bond Portfolio) and COLTX (Columbia Tax-Exempt Fund) are both Municipal Bonds funds. Over the past 3 years, DFABX returned 2.82%/yr vs 4.45%/yr for COLTX. At a 0.39 correlation, their price movements are largely independent. DFABX charges 0.25%/yr vs 0.73%/yr for COLTX.

Performance

DFABX vs. COLTX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in DFA Short-Term Selective State Municipal Bond Portfolio (DFABX) and Columbia Tax-Exempt Fund (COLTX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, DFABX achieves a 1.18% return, which is significantly lower than COLTX's 2.49% return.

DFABX

• 1D: 0.10%
• 1M: 0.30%
• YTD: 1.18%
• 6M: 1.18%
• 1Y: 2.66%
• 3Y*: 2.82%
• 5Y*: —
• 10Y*: —

COLTX

• 1D: 0.08%
• 1M: 2.26%
• YTD: 2.49%
• 6M: 2.98%
• 1Y: 8.37%
• 3Y*: 4.45%
• 5Y*: 0.66%
• 10Y*: 1.92%

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

DFABX vs. COLTX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022
DFABX DFA Short-Term Selective State Municipal Bond Portfolio	1.18%	2.46%	2.90%	2.87%	0.55%
COLTX Columbia Tax-Exempt Fund	2.49%	3.86%	3.47%	6.60%	-4.34%

Correlation

The correlation between DFABX and COLTX is 0.17, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.17
Correlation (3Y) Calculated over the trailing 3-year period	0.28
Correlation (All Time) Calculated using the full available price history since Apr 14, 2022	0.39

Over the past year, the correlation between DFABX and COLTX has dropped to 0.17 - well below their long-term average of 0.39, suggesting their price drivers have been diverging.

Return for Risk

DFABX vs. COLTX — Risk / Return Rank

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

DFABX

DFABX Risk / Return Rank: 100
DFABX Sharpe Ratio Rank: 99
DFABX Sortino Ratio Rank: 100
DFABX Omega Ratio Rank: 100
DFABX Calmar Ratio Rank: 100
DFABX Martin Ratio Rank: 100

COLTX

COLTX Risk / Return Rank: 71
COLTX Sharpe Ratio Rank: 79
COLTX Sortino Ratio Rank: 86
COLTX Omega Ratio Rank: 87
COLTX Calmar Ratio Rank: 55
COLTX Martin Ratio Rank: 48

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.

DFABX vs. COLTX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for DFA Short-Term Selective State Municipal Bond Portfolio (DFABX) and Columbia Tax-Exempt Fund (COLTX). 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.

	DFABX	COLTX	Difference
Sharpe ratio: Return per unit of total volatility	4.77	2.39	+2.38
Sortino ratio: Return per unit of downside risk	12.57	3.79	+8.78
Omega ratio: Gain probability vs. loss probability	6.47	1.56	+4.91
Calmar ratio: Return relative to maximum drawdown	24.96	2.70	+22.25
Martin ratio: Return relative to average drawdown	107.63	9.36	+98.27

DFABX vs. COLTX - Sharpe Ratio Comparison

The current DFABX Sharpe Ratio is 4.77, which is higher than the COLTX Sharpe Ratio of 2.39. The chart below compares the historical Sharpe Ratios of DFABX and COLTX, calculated using daily returns over the previous 12 months. A higher Sharpe Ratio indicates better risk-adjusted performance relative to the risk-free rate.

Drawdowns

DFABX vs. COLTX - Drawdown Comparison

The maximum DFABX drawdown since its inception was -2.46%, smaller than the maximum COLTX drawdown of -18.07%. Use the drawdown chart below to compare losses from any high point for DFABX and COLTX.

Drawdown Indicators

	DFABX	COLTX	Difference
Max Drawdown Largest peak-to-trough decline	-2.46%	-18.07%	+15.61%
Max Drawdown (1Y) Largest decline over 1 year	-0.11%	-3.11%	+3.00%
Max Drawdown (3Y) Largest decline over 3 years	-0.60%	-8.08%	+7.48%
Max Drawdown (5Y) Largest decline over 5 years	—	-18.07%	—
Max Drawdown (10Y) Largest decline over 10 years	—	-18.07%	—
Current Drawdown Current decline from peak	0.00%	0.00%	0.00%
Average Drawdown Average peak-to-trough decline	-0.23%	-2.63%	+2.40%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.02%	0.90%	-0.88%

Volatility

DFABX vs. COLTX - Volatility Comparison

The current volatility for DFA Short-Term Selective State Municipal Bond Portfolio (DFABX) is 0.19%, while Columbia Tax-Exempt Fund (COLTX) has a volatility of 0.94%. This indicates that DFABX experiences smaller price fluctuations and is considered to be less risky than COLTX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	DFABX	COLTX	Difference
Volatility (1M) Calculated over the trailing 1-month period	0.19%	0.94%	-0.75%
Volatility (6M) Calculated over the trailing 6-month period	0.43%	2.56%	-2.13%
Volatility (1Y) Calculated over the trailing 1-year period	0.57%	3.52%	-2.95%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	0.96%	5.24%	-4.28%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	0.96%	4.98%	-4.02%

DFABX vs. COLTX - Expense Ratio Comparison

DFABX has a 0.25% expense ratio, which is lower than COLTX's 0.73% expense ratio.

Dividends

DFABX vs. COLTX - Dividend Comparison

DFABX's dividend yield for the trailing twelve months is around 2.62%, less than COLTX's 3.73% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
COLTX Columbia Tax-Exempt Fund	3.73%	4.91%	3.66%	3.15%	3.05%	3.20%	3.27%	4.60%	3.80%	3.86%	4.15%	4.13%
DFABX DFA Short-Term Selective State Municipal Bond Portfolio	2.62%	2.33%	2.86%	2.52%	1.25%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%

Frequently Asked Questions

Can I hold both DFABX and COLTX in my portfolio?

DFABX and COLTX 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.

Which is riskier, DFABX or COLTX?

COLTX has higher volatility (0.94%) compared to DFABX (0.19%). In terms of maximum drawdown, DFABX dropped -2.46% vs COLTX's -18.07%.

Which has better risk-adjusted returns?

DFABX currently has the higher Sharpe Ratio (4.77 vs 2.39), 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.