MFIOX vs. IUSB
MFIOX (MFS Income Fund) and IUSB (iShares Core Universal USD Bond ETF) are both Intermediate Core-Plus Bond funds. Over the past 10 years, MFIOX returned 2.75%/yr vs 1.94%/yr for IUSB. A 0.77 correlation means they provide meaningful diversification when combined. MFIOX charges 0.73%/yr vs 0.06%/yr for IUSB.
Performance
MFIOX vs. IUSB - Performance Comparison
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Returns By Period
In the year-to-date period, MFIOX achieves a 0.63% return, which is significantly higher than IUSB's 0.43% return. Over the past 10 years, MFIOX has outperformed IUSB with an annualized return of 2.75%, while IUSB has yielded a comparatively lower 1.94% annualized return.
MFIOX
- 1D
- 0.00%
- 1M
- 0.58%
- YTD
- 0.63%
- 6M
- 0.68%
- 1Y
- 5.85%
- 3Y*
- 5.05%
- 5Y*
- 0.75%
- 10Y*
- 2.75%
IUSB
- 1D
- -0.17%
- 1M
- 0.31%
- YTD
- 0.43%
- 6M
- 0.31%
- 1Y
- 5.54%
- 3Y*
- 4.51%
- 5Y*
- 0.44%
- 10Y*
- 1.94%
MFIOX vs. IUSB - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
MFIOX MFS Income Fund | 0.63% | 7.37% | 2.66% | 7.46% | -14.14% | -0.28% | 9.47% | 11.36% | -2.38% | 5.73% |
IUSB iShares Core Universal USD Bond ETF | 0.43% | 7.38% | 2.11% | 6.23% | -13.04% | -1.33% | 7.62% | 9.13% | -0.27% | 3.82% |
Correlation
The correlation between MFIOX and IUSB is 0.86, indicating a strong positive relationship between their price movements. Combining them offers limited diversification - they tend to fall together during downturns.
| Correlation | |
|---|---|
Correlation (1Y) Calculated over the trailing 1-year period | 0.86 |
Correlation (3Y) Calculated over the trailing 3-year period | 0.90 |
Correlation (5Y) Calculated over the trailing 5-year period | 0.91 |
Correlation (10Y) Calculated over the trailing 10-year period | 0.83 |
Correlation (All Time) Calculated using the full available price history since Jun 13, 2014 | 0.77 |
The correlation between MFIOX and IUSB shifts across timeframes, from 0.77 (all time) to 0.91 (5 years), reflecting how their relationship changes across market environments.
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Return for Risk
MFIOX vs. IUSB — Risk / Return Rank
MFIOX
IUSB
MFIOX vs. IUSB - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for MFS Income Fund (MFIOX) and iShares Core Universal USD Bond ETF (IUSB). 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.
| MFIOX | IUSB | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | +0.06 | ||
| Sortino ratioReturn per unit of downside risk | +0.09 | ||
| Omega ratioGain probability vs. loss probability | 1.30 | 1.27 | +0.03 |
| Calmar ratioReturn relative to maximum drawdown | 2.09 | 2.20 | -0.12 |
| Martin ratioReturn relative to average drawdown | 6.63 | 6.68 | -0.05 |
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month. | |||
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Sharpe Ratios by Period
| MFIOX | IUSB | Difference | |
|---|---|---|---|
Sharpe Ratio (1Y)Calculated over the trailing 1-year period | 1.59 | 1.54 | +0.06 |
Sharpe Ratio (5Y)Calculated over the trailing 5-year period | 0.14 | 0.08 | +0.06 |
Sharpe Ratio (10Y)Calculated over the trailing 10-year period | 0.57 | 0.39 | +0.18 |
Sharpe Ratio (All Time)Calculated using the full available price history | 1.36 | 0.46 | +0.90 |
Drawdowns
MFIOX vs. IUSB - Drawdown Comparison
The maximum MFIOX drawdown since its inception was -19.07%, which is greater than IUSB's maximum drawdown of -17.90%. Use the drawdown chart below to compare losses from any high point for MFIOX and IUSB.
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Drawdown Indicators
| MFIOX | IUSB | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -19.07% | -17.90% | -1.17% |
Max Drawdown (1Y)Largest decline over 1 year | -2.81% | -2.53% | -0.28% |
Max Drawdown (3Y)Largest decline over 3 years | -5.88% | -5.82% | -0.06% |
Max Drawdown (5Y)Largest decline over 5 years | -19.07% | -17.87% | -1.20% |
Max Drawdown (10Y)Largest decline over 10 years | -19.07% | -17.90% | -1.17% |
Current DrawdownCurrent decline from peak | -0.97% | -1.33% | +0.36% |
Average DrawdownAverage peak-to-trough decline | -2.18% | -3.59% | +1.41% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 0.88% | 0.83% | +0.05% |
Volatility
MFIOX vs. IUSB - Volatility Comparison
MFS Income Fund (MFIOX) and iShares Core Universal USD Bond ETF (IUSB) have volatilities of 1.29% and 1.24%, respectively, indicating that both stocks experience similar levels of price fluctuations. This suggests that the risk associated with both stocks, as measured by volatility, is nearly the same. The chart below showcases a comparison of their rolling one-month volatility.
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Volatility by Period
| MFIOX | IUSB | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 1.29% | 1.24% | +0.05% |
Volatility (6M)Calculated over the trailing 6-month period | 2.59% | 2.62% | -0.03% |
Volatility (1Y)Calculated over the trailing 1-year period | 3.69% | 3.62% | +0.07% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 5.51% | 5.79% | -0.28% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 4.87% | 5.04% | -0.17% |
MFIOX vs. IUSB - Expense Ratio Comparison
MFIOX has a 0.73% expense ratio, which is higher than IUSB's 0.06% expense ratio.
Dividends
MFIOX vs. IUSB - Dividend Comparison
MFIOX's dividend yield for the trailing twelve months is around 4.70%, more than IUSB's 4.23% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
IUSB iShares Core Universal USD Bond ETF | 4.23% | 4.17% | 4.04% | 3.46% | 2.53% | 1.74% | 2.68% | 3.04% | 2.98% | 2.56% | 2.60% | 1.95% |
MFIOX MFS Income Fund | 4.70% | 4.70% | 5.04% | 4.72% | 2.24% | 3.29% | 2.80% | 3.04% | 3.07% | 3.26% | 3.61% | 4.35% |
Frequently Asked Questions
MFIOX and IUSB have a correlation of 0.86, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.
MFIOX has higher volatility (1.29%) compared to IUSB (1.24%). In terms of maximum drawdown, MFIOX dropped -19.07% vs IUSB's -17.90%.
MFIOX currently has the higher Sharpe Ratio (1.59 vs 1.54), 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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