SPAXX vs. MFIOX

Last updated Apr 2, 2026

Compare and contrast key facts about Fidelity Government Money Market Fund (SPAXX) and MFS Income Fund (MFIOX).

SPAXX is managed by Fidelity. It was launched on Feb 5, 1990. MFIOX is managed by MFS. It was launched on Oct 29, 1987.

Performance

SPAXX vs. MFIOX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Fidelity Government Money Market Fund (SPAXX) and MFS Income Fund (MFIOX). The values are adjusted to include any dividend payments, if applicable.

SPAXX vs. MFIOX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021
SPAXX Fidelity Government Money Market Fund	0.53%	3.96%	1.54%	0.41%	0.00%	0.00%
MFIOX MFS Income Fund	-0.58%	7.37%	2.66%	7.46%	-14.14%	1.46%

Returns By Period

In the year-to-date period, SPAXX achieves a 0.53% return, which is significantly higher than MFIOX's -0.58% return.

SPAXX

• 1D: 0.00%
• 1M: 0.00%
• YTD: 0.53%
• 6M: 1.46%
• 1Y: 3.49%
• 3Y*: 2.14%
• 5Y*: —
• 10Y*: —

MFIOX

• 1D: 0.17%
• 1M: -1.83%
• YTD: -0.58%
• 6M: 0.07%
• 1Y: 3.84%
• 3Y*: 4.45%
• 5Y*: 0.67%
• 10Y*: 2.88%

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

SPAXX vs. MFIOX - Expense Ratio Comparison

MFIOX

MFS Income Fund

Return for Risk

SPAXX vs. MFIOX — Risk / Return Rank

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

MFIOX

MFIOX Risk / Return Rank: 52
MFIOX Sharpe Ratio Rank: 52
MFIOX Sortino Ratio Rank: 51
MFIOX Omega Ratio Rank: 39
MFIOX Calmar Ratio Rank: 67
MFIOX Martin Ratio Rank: 50

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.

SPAXX vs. MFIOX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Fidelity Government Money Market Fund (SPAXX) 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.

	SPAXX	MFIOX	Difference
Sharpe ratio Return per unit of total volatility	3.48	1.04	+2.45
Sortino ratio Return per unit of downside risk	—	1.50	—
Omega ratio Gain probability vs. loss probability	—	1.19	—
Calmar ratio Return relative to maximum drawdown	—	1.68	—
Martin ratio Return relative to average drawdown	—	5.32	—
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

SPAXX vs. MFIOX - Sharpe Ratio Comparison

The current SPAXX Sharpe Ratio is 3.48, which is higher than the MFIOX Sharpe Ratio of 1.04. The chart below compares the historical Sharpe Ratios of SPAXX and MFIOX, 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

	SPAXX	MFIOX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	3.48	1.04	+2.45
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	—	0.12	—
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	—	0.60	—
Sharpe Ratio (All Time) Calculated using the full available price history	2.01	1.36	+0.65

Correlation

The correlation between SPAXX and MFIOX is 0.15, which is considered to be low. This implies their price changes are not closely related. A low correlation is generally favorable for portfolio diversification, as it helps to reduce overall risk by spreading it across multiple assets with different performance patterns.

Dividends

SPAXX vs. MFIOX - Dividend Comparison

SPAXX's dividend yield for the trailing twelve months is around 3.42%, less than MFIOX's 4.31% yield.

	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
SPAXX Fidelity Government Money Market Fund	3.42%	3.88%	1.53%	0.41%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%
MFIOX MFS Income Fund	4.31%	4.70%	5.04%	4.72%	2.24%	3.29%	2.80%	3.04%	3.07%	3.26%	3.61%	4.35%

Drawdowns

SPAXX vs. MFIOX - Drawdown Comparison

The maximum SPAXX drawdown since its inception was 0.00%, smaller than the maximum MFIOX drawdown of -19.07%. Use the drawdown chart below to compare losses from any high point for SPAXX and MFIOX.

Drawdown Indicators

	SPAXX	MFIOX	Difference
Max Drawdown Largest peak-to-trough decline	0.00%	-19.07%	+19.07%
Max Drawdown (1Y) Largest decline over 1 year	0.00%	-2.86%	+2.86%
Max Drawdown (5Y) Largest decline over 5 years	—	-19.07%	—
Max Drawdown (10Y) Largest decline over 10 years	—	-19.07%	—
Current Drawdown Current decline from peak	0.00%	-2.15%	+2.15%
Average Drawdown Average peak-to-trough decline	0.00%	-2.19%	+2.19%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.00%	0.90%	-0.90%

Volatility

SPAXX vs. MFIOX - Volatility Comparison

The current volatility for Fidelity Government Money Market Fund (SPAXX) is 0.00%, while MFS Income Fund (MFIOX) has a volatility of 1.40%. This indicates that SPAXX experiences smaller price fluctuations and is considered to be less risky than MFIOX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	SPAXX	MFIOX	Difference
Volatility (1M) Calculated over the trailing 1-month period	0.00%	1.40%	-1.40%
Volatility (6M) Calculated over the trailing 6-month period	0.71%	2.33%	-1.62%
Volatility (1Y) Calculated over the trailing 1-year period	1.08%	4.09%	-3.01%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	0.67%	5.48%	-4.81%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	0.67%	4.86%	-4.19%