SCMB vs. SUB

Last updated Apr 1, 2026

Compare and contrast key facts about Schwab Municipal Bond ETF (SCMB) and iShares Short-Term National Muni Bond ETF (SUB).

SCMB and SUB are both exchange-traded funds (ETFs), meaning they are traded on stock exchanges and can be bought and sold throughout the day. SCMB is a passively managed fund by Charles Schwab that tracks the performance of the ICE AMT-Free Core U.S. National Municipal Index - Benchmark TR Gross. It was launched on Oct 11, 2022. SUB is a passively managed fund by iShares that tracks the performance of the ICE Short Maturity AMT-Free US National Municipal Index - Benchmark TR Gross. It was launched on Nov 5, 2008. Both SCMB and SUB are passive ETFs, meaning that they are not actively managed but aim to replicate the performance of the underlying index as closely as possible.

Performance

SCMB vs. SUB - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Schwab Municipal Bond ETF (SCMB) and iShares Short-Term National Muni Bond ETF (SUB). The values are adjusted to include any dividend payments, if applicable.

SCMB vs. SUB - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022
SCMB Schwab Municipal Bond ETF	-0.51%	3.78%	0.91%	5.86%	3.05%
SUB iShares Short-Term National Muni Bond ETF	0.23%	3.64%	2.17%	2.91%	1.49%

Returns By Period

In the year-to-date period, SCMB achieves a -0.51% return, which is significantly lower than SUB's 0.23% return.

SCMB

• 1D: 0.24%
• 1M: -2.42%
• YTD: -0.51%
• 6M: 1.25%
• 1Y: 3.88%
• 3Y*: 2.44%
• 5Y*: —
• 10Y*: —

SUB

• 1D: 0.04%
• 1M: -0.66%
• YTD: 0.23%
• 6M: 1.01%
• 1Y: 3.37%
• 3Y*: 2.75%
• 5Y*: 1.39%
• 10Y*: 1.46%

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

SCMB vs. SUB - Expense Ratio Comparison

SCMB has a 0.03% expense ratio, which is lower than SUB's 0.07% expense ratio. Despite the difference, both funds are considered low-cost compared to the broader market, where average expense ratios usually range from 0.3% to 0.9%.

SUB

iShares Short-Term National Muni Bond ETF

SCMB

Schwab Municipal Bond ETF

Return for Risk

SCMB vs. SUB — Risk / Return Rank

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

SCMB

SCMB Risk / Return Rank: 49
SCMB Sharpe Ratio Rank: 56
SCMB Sortino Ratio Rank: 47
SCMB Omega Ratio Rank: 61
SCMB Calmar Ratio Rank: 45
SCMB Martin Ratio Rank: 35

SUB

SUB Risk / Return Rank: 92
SUB Sharpe Ratio Rank: 94
SUB Sortino Ratio Rank: 92
SUB Omega Ratio Rank: 97
SUB Calmar Ratio Rank: 89
SUB Martin Ratio Rank: 88

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.

SCMB vs. SUB - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Schwab Municipal Bond ETF (SCMB) and iShares Short-Term National Muni Bond ETF (SUB). 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.

	SCMB	SUB	Difference
Sharpe ratio Return per unit of total volatility	0.94	2.25	-1.31
Sortino ratio Return per unit of downside risk	1.22	2.71	-1.49
Omega ratio Gain probability vs. loss probability	1.21	1.61	-0.40
Calmar ratio Return relative to maximum drawdown	1.05	2.82	-1.76
Martin ratio Return relative to average drawdown	2.98	10.30	-7.32
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

SCMB vs. SUB - Sharpe Ratio Comparison

The current SCMB Sharpe Ratio is 0.94, which is lower than the SUB Sharpe Ratio of 2.25. The chart below compares the historical Sharpe Ratios of SCMB and SUB, offering insights into how both investments have performed under varying market conditions. These values are calculated using daily returns over the previous 12 months.

Sharpe Ratios by Period

	SCMB	SUB	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	0.94	2.25	-1.31
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	—	0.85	—
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	—	0.56	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.90	0.42	+0.48

Correlation

The correlation between SCMB and SUB is 0.71, which is considered to be high. That indicates a strong positive relationship between their price movements. Having highly-correlated positions in a portfolio may signal a lack of diversification, potentially leading to increased risk during market downturns.

Dividends

SCMB vs. SUB - Dividend Comparison

SCMB's dividend yield for the trailing twelve months is around 3.38%, more than SUB's 2.47% yield.

	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
SCMB Schwab Municipal Bond ETF	3.38%	3.36%	3.34%	3.10%	0.59%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%
SUB iShares Short-Term National Muni Bond ETF	2.47%	2.42%	2.10%	1.73%	0.86%	0.72%	1.23%	1.58%	1.32%	0.95%	0.75%	0.77%

Drawdowns

SCMB vs. SUB - Drawdown Comparison

The maximum SCMB drawdown since its inception was -6.13%, smaller than the maximum SUB drawdown of -9.46%. Use the drawdown chart below to compare losses from any high point for SCMB and SUB.

Drawdown Indicators

	SCMB	SUB	Difference
Max Drawdown Largest peak-to-trough decline	-6.13%	-9.46%	+3.33%
Max Drawdown (1Y) Largest decline over 1 year	-3.79%	-1.23%	-2.56%
Max Drawdown (5Y) Largest decline over 5 years	—	-4.35%	—
Max Drawdown (10Y) Largest decline over 10 years	—	-9.46%	—
Current Drawdown Current decline from peak	-2.42%	-0.66%	-1.76%
Average Drawdown Average peak-to-trough decline	-1.32%	-0.92%	-0.40%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.34%	0.34%	+1.00%

Volatility

SCMB vs. SUB - Volatility Comparison

Schwab Municipal Bond ETF (SCMB) has a higher volatility of 1.47% compared to iShares Short-Term National Muni Bond ETF (SUB) at 0.53%. This indicates that SCMB's price experiences larger fluctuations and is considered to be riskier than SUB based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	SCMB	SUB	Difference
Volatility (1M) Calculated over the trailing 1-month period	1.47%	0.53%	+0.94%
Volatility (6M) Calculated over the trailing 6-month period	2.02%	0.80%	+1.22%
Volatility (1Y) Calculated over the trailing 1-year period	4.15%	1.51%	+2.64%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	4.22%	1.64%	+2.58%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	4.22%	2.59%	+1.63%