OPCAX vs. SCMB

Last updated Jun 23, 2026

OPCAX (Invesco California Municipal Fund) and SCMB (Schwab Municipal Bond ETF) are both Municipal Bonds funds. Over the past 3 years, OPCAX returned 3.75%/yr vs 3.13%/yr for SCMB. A 0.73 correlation means they provide meaningful diversification when combined. OPCAX charges 0.75%/yr vs 0.03%/yr for SCMB.

Performance

OPCAX vs. SCMB - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Invesco California Municipal Fund (OPCAX) and Schwab Municipal Bond ETF (SCMB). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, OPCAX achieves a 1.96% return, which is significantly higher than SCMB's 1.39% return.

OPCAX

• 1D: 0.13%
• 1M: 2.41%
• YTD: 1.96%
• 6M: 2.45%
• 1Y: 7.05%
• 3Y*: 3.75%
• 5Y*: 0.43%
• 10Y*: 2.98%

SCMB

• 1D: -0.16%
• 1M: 1.47%
• YTD: 1.39%
• 6M: 1.58%
• 1Y: 6.25%
• 3Y*: 3.13%
• 5Y*: —
• 10Y*: —

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

OPCAX vs. SCMB - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022
OPCAX Invesco California Municipal Fund	1.96%	2.59%	2.86%	6.86%	3.27%
SCMB Schwab Municipal Bond ETF	1.39%	3.78%	0.91%	5.86%	2.88%

Correlation

The correlation between OPCAX and SCMB is 0.62, 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	0.62
Correlation (3Y) Calculated over the trailing 3-year period	0.73
Correlation (All Time) Calculated using the full available price history since Oct 12, 2022	0.73

The correlation between OPCAX and SCMB shifts across timeframes, from 0.62 (1 year) to 0.73 (all time), reflecting how their relationship changes across market environments.

Return for Risk

OPCAX vs. SCMB — Risk / Return Rank

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

OPCAX

OPCAX Risk / Return Rank: 56
OPCAX Sharpe Ratio Rank: 55
OPCAX Sortino Ratio Rank: 66
OPCAX Omega Ratio Rank: 77
OPCAX Calmar Ratio Rank: 44
OPCAX Martin Ratio Rank: 38

SCMB

SCMB Risk / Return Rank: 63
SCMB Sharpe Ratio Rank: 71
SCMB Sortino Ratio Rank: 76
SCMB Omega Ratio Rank: 81
SCMB Calmar Ratio Rank: 45
SCMB Martin Ratio Rank: 45

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.

OPCAX vs. SCMB - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Invesco California Municipal Fund (OPCAX) and Schwab Municipal Bond ETF (SCMB). 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.

	OPCAX	SCMB	Difference
Sharpe ratio: Return per unit of total volatility	2.02	2.17	-0.15
Sortino ratio: Return per unit of downside risk	3.09	3.18	-0.09
Omega ratio: Gain probability vs. loss probability	1.46	1.46	0.00
Calmar ratio: Return relative to maximum drawdown	2.40	2.15	+0.25
Martin ratio: Return relative to average drawdown	7.80	7.06	+0.74

OPCAX vs. SCMB - Sharpe Ratio Comparison

The current OPCAX Sharpe Ratio is 2.02, which is comparable to the SCMB Sharpe Ratio of 2.17. The chart below compares the historical Sharpe Ratios of OPCAX and SCMB, 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

OPCAX vs. SCMB - Drawdown Comparison

The maximum OPCAX drawdown since its inception was -47.36%, which is greater than SCMB's maximum drawdown of -6.13%. Use the drawdown chart below to compare losses from any high point for OPCAX and SCMB.

Drawdown Indicators

	OPCAX	SCMB	Difference
Max Drawdown Largest peak-to-trough decline	-47.36%	-6.13%	-41.23%
Max Drawdown (1Y) Largest decline over 1 year	-3.25%	-2.92%	-0.33%
Max Drawdown (3Y) Largest decline over 3 years	-8.46%	-5.57%	-2.89%
Max Drawdown (5Y) Largest decline over 5 years	-18.53%	—	—
Max Drawdown (10Y) Largest decline over 10 years	-18.53%	—	—
Current Drawdown Current decline from peak	0.00%	-0.56%	+0.56%
Average Drawdown Average peak-to-trough decline	-4.30%	-1.31%	-2.99%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.04%	0.89%	+0.15%

Volatility

OPCAX vs. SCMB - Volatility Comparison

Invesco California Municipal Fund (OPCAX) has a higher volatility of 0.99% compared to Schwab Municipal Bond ETF (SCMB) at 0.76%. This indicates that OPCAX's price experiences larger fluctuations and is considered to be riskier than SCMB based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	OPCAX	SCMB	Difference
Volatility (1M) Calculated over the trailing 1-month period	0.99%	0.76%	+0.23%
Volatility (6M) Calculated over the trailing 6-month period	2.73%	2.17%	+0.56%
Volatility (1Y) Calculated over the trailing 1-year period	3.87%	2.89%	+0.98%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	5.46%	4.14%	+1.32%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	5.12%	4.14%	+0.98%

OPCAX vs. SCMB - Expense Ratio Comparison

OPCAX has a 0.75% expense ratio, which is higher than SCMB's 0.03% expense ratio.

Dividends

OPCAX vs. SCMB - Dividend Comparison

OPCAX's dividend yield for the trailing twelve months is around 2.75%, less than SCMB's 3.52% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
OPCAX Invesco California Municipal Fund	2.75%	4.76%	4.19%	3.06%	2.86%	3.05%	3.15%	3.64%	3.71%	4.59%	4.92%	5.48%
SCMB Schwab Municipal Bond ETF	3.52%	3.36%	3.34%	3.10%	0.59%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%

Frequently Asked Questions

Can I hold both OPCAX and SCMB in my portfolio?

OPCAX and SCMB have a correlation of 0.62, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, OPCAX or SCMB?

OPCAX has higher volatility (0.99%) compared to SCMB (0.76%). In terms of maximum drawdown, OPCAX dropped -47.36% vs SCMB's -6.13%.

Which has better risk-adjusted returns?

SCMB currently has the higher Sharpe Ratio (2.17 vs 2.02), 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.