MFS Municipal Income Fund (MMIBX)

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The chart shows the growth of an initial investment of $10,000 in MFS Municipal Income Fund, comparing it to the performance of the S&P 500 index or another benchmark. All prices have been adjusted for splits and dividends.

MFS Municipal Income Fund (MMIBX) has returned -0.87% so far this year and 2.63% over the past 12 months. Over the last ten years, MMIBX has returned 1.39% per year, falling short of the S&P 500 Index benchmark, which averaged 12.16% annually.

Based on dividend-adjusted daily data since Dec 29, 1986, MMIBX's average daily return is +0.01%, while the average monthly return is +0.25%. At this rate, your investment would double in approximately 23.1 years.

Historically, 63% of months were positive and 37% were negative. The best month was Nov 2023 with a return of +7.2%, while the worst month was Apr 1987 at -6.9%. The longest winning streak lasted 12 consecutive months, and the longest losing streak was 4 months.

On a daily basis, MMIBX closed higher 35% of trading days. The best single day was Mar 25, 2020 with a return of +3.7%, while the worst single day was Mar 12, 2020 at -3.3%.

MFS Municipal Income Fund has an annualized alpha of 2.92%, beta of 0.01, and R² of 0.00 versus S&P 500 Index. Calculated based on daily prices since December 30, 1986.

• This fund participates in less of S&P 500 Index's moves in both directions, but captures a larger share of gains (12.90%) than losses (6.60%) — typical of diversified or defensive assets.
• Beta of 0.01 may look defensive, but with R² of 0.00 this fund is largely uncorrelated with S&P 500 Index — low beta reflects independence, not downside protection. See the Volatility section for a true picture of this fund's risk.
• R² of 0.00 means this fund moves largely independently of S&P 500 Index — capture ratios reflect limited market correlation rather than active downside protection. Consider using a more representative benchmark.

MMIBX has a high expense ratio of 1.45%, indicating above-average management fees.

MMIBX ranks 23 for risk / return — below 23% of mutual funds on our site. The returns aren't fully compensating for the risk involved. This isn't necessarily a dealbreaker, but factor it into your decision — especially if you're risk-averse.

The table below present risk-adjusted performance metrics for MFS Municipal Income Fund (MMIBX) and compare them to a chosen benchmark (S&P 500 Index).

MFS Municipal Income Fund provided a 2.96% dividend yield over the last twelve months, with an annual payout of $0.24 per share. The fund has been increasing its distributions for 3 consecutive years.

The table displays the monthly dividend distributions for MFS Municipal Income Fund. The dividends shown in the table have been adjusted to account for any splits that may have occurred.

The Drawdowns chart displays portfolio losses from any high point along the way. Drawdowns are calculated considering price movements and all distributions paid, if any.

The table below displays the maximum drawdowns of the MFS Municipal Income Fund. A maximum drawdown is a measure of risk, indicating the largest reduction in portfolio value due to a series of losing trades.

The maximum drawdown for the MFS Municipal Income Fund was 17.40%, occurring on Oct 19, 1987. Recovery took 1178 trading sessions.

The current MFS Municipal Income Fund drawdown is 3.43%.

The chart below shows the rolling one-month volatility.