MFBFX vs. MFIOX
MFBFX (MFS Corporate Bond Fund) and MFIOX (MFS Income Fund) are both mutual funds - MFBFX is a Corporate Bonds fund managed by MFS, while MFIOX is a Intermediate Core-Plus Bond fund managed by MFS. Over the past 10 years, MFBFX returned 1.99%/yr vs 2.38%/yr for MFIOX. Their 0.72 correlation means they have sometimes moved together and sometimes differently. MFBFX charges 0.76%/yr vs 0.73%/yr for MFIOX.
Performance
MFBFX vs. MFIOX - Performance Comparison
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Returns By Period
In the year-to-date period, MFBFX achieves a -1.06% return, which is significantly lower than MFIOX's -0.68% return. Over the past 10 years, MFBFX has underperformed MFIOX with an annualized return of 1.99%, while MFIOX has yielded a comparatively higher 2.38% annualized return.
MFBFX
- 1D
- -0.16%
- 1M
- -1.86%
- 6M
- -1.36%
- YTD
- -1.06%
- 1Y
- 1.41%
- 3Y*
- 4.21%
- 5Y*
- -0.89%
- 10Y*
- 1.99%
- ALL TIME*
- 4.28%
MFIOX
- 1D
- -0.17%
- 1M
- -1.53%
- 6M
- -0.89%
- YTD
- -0.68%
- 1Y
- 1.92%
- 3Y*
- 4.49%
- 5Y*
- 0.04%
- 10Y*
- 2.38%
- ALL TIME*
- 6.16%
Liquidity Comparison
| Position | Avg. Volume Value (2W) | Avg. Volume Value (1M) | Avg. Volume Value (3M) |
|---|---|---|---|
| $0.00 | $0.00 | $0.00 | |
MFIOX MFS Income Fund | $0.00 | $0.00 | $0.00 |
MFBFX vs. MFIOX - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
MFBFX MFS Corporate Bond Fund | -1.06% | 7.35% | 2.03% | 8.09% | -17.27% | -1.47% | 11.01% | 14.43% | -3.19% | 6.08% |
MFIOX MFS Income Fund | -0.68% | 7.37% | 2.66% | 7.46% | -14.14% | -0.28% | 9.47% | 11.36% | -2.38% | 5.73% |
Correlation
The correlation between MFBFX and MFIOX is 0.94, meaning they have usually moved in the same direction, including during past declines.
| Correlation | |
|---|---|
Correlation (1Y) Focuses on recent behavior, but can change the most. | 0.94 |
Correlation (3Y) Balances recent behavior with more history. | 0.95 |
Correlation (5Y) Shows whether the relationship held over a longer period. | 0.95 |
Correlation (10Y) Provides a long-term view across more market conditions. | 0.92 |
Correlation (All Time) Calculated using the full available price history since Oct 29, 1987 | 0.72 |
Over the past year, MFBFX and MFIOX have become more correlated (0.94) than their long-term average of 0.72, meaning their price movements have been converging.
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Return for Risk
MFBFX vs. MFIOX — Risk / Return Rank
MFBFX
MFIOX
MFBFX vs. MFIOX - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for MFS Corporate Bond Fund (MFBFX) and MFS Income Fund (MFIOX). 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.
| MFBFX | MFIOX | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | -0.20 | ||
| Sortino ratioReturn per unit of downside risk | -0.29 | ||
| Omega ratioGain probability vs. loss probability | 1.09 | 1.13 | -0.04 |
| Calmar ratioReturn relative to maximum drawdown | 0.63 | 0.87 | -0.24 |
| Martin ratioReturn relative to average drawdown | 1.84 | 2.40 | -0.56 |
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Drawdowns
MFBFX vs. MFIOX - Drawdown Comparison
The maximum MFBFX drawdown since its inception was -29.78%, which is greater than MFIOX's maximum drawdown of -19.07%. Use the drawdown chart below to compare losses from any high point for MFBFX and MFIOX.
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Drawdown Indicators
| MFBFX | MFIOX | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -29.78% | -19.07% | -10.71% |
Max Drawdown (1Y)Largest decline over 1 year | -3.17% | -2.81% | -0.36% |
Max Drawdown (3Y)Largest decline over 3 years | -5.74% | -4.99% | -0.75% |
Max Drawdown (5Y)Largest decline over 5 years | -23.44% | -19.07% | -4.37% |
Max Drawdown (10Y)Largest decline over 10 years | -23.44% | -19.07% | -4.37% |
Current DrawdownCurrent decline from peak | -4.56% | -2.25% | -2.31% |
Average DrawdownAverage peak-to-trough decline | -6.18% | -2.18% | -4.00% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 1.08% | 1.02% | +0.06% |
Volatility
MFBFX vs. MFIOX - Volatility Comparison
MFS Corporate Bond Fund (MFBFX) has a higher volatility of 0.94% compared to MFS Income Fund (MFIOX) at 0.84%. This indicates that MFBFX's price experiences larger fluctuations and is considered to be riskier than MFIOX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.
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Volatility by Period
| MFBFX | MFIOX | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 0.94% | 0.84% | +0.10% |
Volatility (6M)Calculated over the trailing 6-month period | 3.15% | 2.76% | +0.39% |
Volatility (1Y)Calculated over the trailing 1-year period | 4.01% | 3.53% | +0.48% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 6.39% | 5.52% | +0.87% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 5.74% | 4.88% | +0.86% |
MFBFX vs. MFIOX - Expense Ratio Comparison
MFBFX has a 0.76% expense ratio, which is higher than MFIOX's 0.73% expense ratio.
Dividends
MFBFX vs. MFIOX - Dividend Comparison
MFBFX's dividend yield for the trailing twelve months is around 4.20%, less than MFIOX's 4.40% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
MFBFX MFS Corporate Bond Fund | 4.20% | 4.54% | 3.74% | 3.16% | 2.46% | 5.61% | 3.47% | 3.01% | 3.15% | 3.07% | 3.27% | 4.16% |
MFIOX MFS Income Fund | 4.40% | 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
With a correlation of 0.94, MFBFX and MFIOX move almost identically. Holding both adds very little diversification - you're essentially doubling your position in the same market segment. Choosing one is usually more capital-efficient.
MFBFX has higher volatility (0.94%) compared to MFIOX (0.84%). In terms of maximum drawdown, MFBFX dropped -29.78% vs MFIOX's -19.07%.
MFIOX currently has the higher Sharpe Ratio (0.70 vs 0.50), 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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