WFBIX vs. VCAIX
WFBIX (iShares U.S. Aggregate Bond Index Fund) and VCAIX (Vanguard California Intermediate-Term Tax-Exempt Fund Investor Shares) are both mutual funds - WFBIX is a Intermediate Core Bond fund managed by BlackRock, while VCAIX is a Municipal Bonds fund actively managed by Vanguard. Over the past 10 years, WFBIX returned 1.68%/yr vs 2.02%/yr for VCAIX. Their 0.52 correlation means they have sometimes moved together and sometimes differently. WFBIX charges 0.05%/yr vs 0.14%/yr for VCAIX.
Performance
WFBIX vs. VCAIX - Performance Comparison
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Returns By Period
In the year-to-date period, WFBIX achieves a -0.91% return, which is significantly lower than VCAIX's -0.26% return. Over the past 10 years, WFBIX has underperformed VCAIX with an annualized return of 1.68%, while VCAIX has yielded a comparatively higher 2.02% annualized return.
WFBIX
- 1D
- -0.22%
- 1M
- -1.55%
- 6M
- -1.01%
- YTD
- -0.91%
- 1Y
- 1.47%
- 3Y*
- 5.11%
- 5Y*
- 0.31%
- 10Y*
- 1.68%
- ALL TIME*
- 4.15%
VCAIX
- 1D
- -0.09%
- 1M
- -1.82%
- 6M
- -1.20%
- YTD
- -0.26%
- 1Y
- 3.82%
- 3Y*
- 3.74%
- 5Y*
- 1.17%
- 10Y*
- 2.02%
- ALL TIME*
- 3.95%
Liquidity Comparison
| Position | Avg. Volume Value (2W) | Avg. Volume Value (1M) | Avg. Volume Value (3M) |
|---|---|---|---|
| $0.00 | $0.00 | $0.00 | |
| $0.00 | $0.00 | $0.00 |
WFBIX vs. VCAIX - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
WFBIX iShares U.S. Aggregate Bond Index Fund | -0.91% | 7.16% | 1.43% | 9.65% | -13.03% | -1.79% | 7.40% | 8.72% | -0.08% | 3.39% |
VCAIX Vanguard California Intermediate-Term Tax-Exempt Fund Investor Shares | -0.26% | 5.83% | 2.15% | 5.82% | -6.69% | 0.40% | 4.53% | 6.95% | 1.19% | 4.83% |
Correlation
The correlation between WFBIX and VCAIX is 0.64, which is moderate. They have sometimes moved together and sometimes differently, sharing some price drivers without tracking each other closely.
| Correlation | |
|---|---|
Correlation (1Y) Focuses on recent behavior, but can change the most. | 0.64 |
Correlation (3Y) Balances recent behavior with more history. | 0.65 |
Correlation (5Y) Shows whether the relationship held over a longer period. | 0.55 |
Correlation (10Y) Provides a long-term view across more market conditions. | 0.52 |
Correlation (All Time) Calculated using the full available price history since Mar 4, 1994 | 0.52 |
The correlation between WFBIX and VCAIX shifts across timeframes, from 0.52 (10 years) to 0.65 (3 years), reflecting how their relationship changes across market environments.
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Return for Risk
WFBIX vs. VCAIX — Risk / Return Rank
WFBIX
VCAIX
WFBIX vs. VCAIX - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for iShares U.S. Aggregate Bond Index Fund (WFBIX) and Vanguard California Intermediate-Term Tax-Exempt Fund Investor Shares (VCAIX). 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.
| WFBIX | VCAIX | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | -1.17 | ||
| Sortino ratioReturn per unit of downside risk | -1.67 | ||
| Omega ratioGain probability vs. loss probability | 1.11 | 1.42 | -0.31 |
| Calmar ratioReturn relative to maximum drawdown | 0.79 | 1.41 | -0.62 |
| Martin ratioReturn relative to average drawdown | 1.91 | 4.01 | -2.10 |
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Drawdowns
WFBIX vs. VCAIX - Drawdown Comparison
The maximum WFBIX drawdown since its inception was -18.68%, which is greater than VCAIX's maximum drawdown of -11.22%. Use the drawdown chart below to compare losses from any high point for WFBIX and VCAIX.
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Drawdown Indicators
| WFBIX | VCAIX | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -18.68% | -11.22% | -7.46% |
Max Drawdown (1Y)Largest decline over 1 year | -3.02% | -2.98% | -0.04% |
Max Drawdown (3Y)Largest decline over 3 years | -5.08% | -3.88% | -1.20% |
Max Drawdown (5Y)Largest decline over 5 years | -17.75% | -11.22% | -6.53% |
Max Drawdown (10Y)Largest decline over 10 years | -18.68% | -11.22% | -7.46% |
Current DrawdownCurrent decline from peak | -2.81% | -2.38% | -0.43% |
Average DrawdownAverage peak-to-trough decline | -2.26% | -1.36% | -0.90% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 1.25% | 1.05% | +0.20% |
Volatility
WFBIX vs. VCAIX - Volatility Comparison
iShares U.S. Aggregate Bond Index Fund (WFBIX) has a higher volatility of 1.01% compared to Vanguard California Intermediate-Term Tax-Exempt Fund Investor Shares (VCAIX) at 0.80%. This indicates that WFBIX's price experiences larger fluctuations and is considered to be riskier than VCAIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.
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Volatility by Period
| WFBIX | VCAIX | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 1.01% | 0.80% | +0.21% |
Volatility (6M)Calculated over the trailing 6-month period | 3.01% | 1.95% | +1.06% |
Volatility (1Y)Calculated over the trailing 1-year period | 3.83% | 2.36% | +1.47% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 6.41% | 3.26% | +3.15% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 5.17% | 3.42% | +1.75% |
WFBIX vs. VCAIX - Expense Ratio Comparison
WFBIX has a 0.05% expense ratio, which is lower than VCAIX's 0.14% 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%.
Dividends
WFBIX vs. VCAIX - Dividend Comparison
WFBIX's dividend yield for the trailing twelve months is around 3.66%, more than VCAIX's 2.91% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
VCAIX Vanguard California Intermediate-Term Tax-Exempt Fund Investor Shares | 2.91% | 3.75% | 3.27% | 2.49% | 2.28% | 1.71% | 2.19% | 2.64% | 2.63% | 2.56% | 2.65% | 2.78% |
WFBIX iShares U.S. Aggregate Bond Index Fund | 3.66% | 3.78% | 3.68% | 6.82% | 2.60% | 2.04% | 2.43% | 2.88% | 2.71% | 2.24% | 2.25% | 2.20% |
Frequently Asked Questions
WFBIX and VCAIX have a correlation of 0.64, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.
WFBIX has higher volatility (1.01%) compared to VCAIX (0.80%). In terms of maximum drawdown, WFBIX dropped -18.68% vs VCAIX's -11.22%.
VCAIX currently has the higher Sharpe Ratio (1.80 vs 0.62), 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.
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