DIFIX vs. BIL

Last updated Jun 3, 2026

DIFIX (MFS Diversified Income Fund) and BIL (SPDR Bloomberg 1-3 Month T-Bill ETF) are both funds - DIFIX is a Diversified Portfolio fund managed by MFS, while BIL is a Government Bonds fund tracking the Bloomberg 1-3 Month U.S. Treasury Bill Index. Over the past 10 years, DIFIX returned 4.88%/yr vs 2.18%/yr for BIL. At a correlation of -0.02, they often move in opposite directions. DIFIX charges 0.73%/yr vs 0.14%/yr for BIL.

Performance

DIFIX vs. BIL - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in MFS Diversified Income Fund (DIFIX) and SPDR Bloomberg 1-3 Month T-Bill ETF (BIL). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, DIFIX achieves a 4.69% return, which is significantly higher than BIL's 1.46% return. Over the past 10 years, DIFIX has outperformed BIL with an annualized return of 4.88%, while BIL has yielded a comparatively lower 2.18% annualized return.

DIFIX

• 1D: -0.23%
• 1M: 0.43%
• YTD: 4.69%
• 6M: 5.34%
• 1Y: 11.44%
• 3Y*: 8.49%
• 5Y*: 3.21%
• 10Y*: 4.88%

BIL

• 1D: -0.01%
• 1M: 0.28%
• YTD: 1.46%
• 6M: 1.76%
• 1Y: 3.87%
• 3Y*: 4.63%
• 5Y*: 3.41%
• 10Y*: 2.18%

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

DIFIX vs. BIL - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
DIFIX MFS Diversified Income Fund	4.69%	9.73%	4.60%	8.84%	-13.55%	9.26%	2.17%	17.69%	-3.41%	8.94%
BIL SPDR Bloomberg 1-3 Month T-Bill ETF	1.46%	4.15%	5.19%	4.94%	1.40%	-0.10%	0.40%	2.03%	1.74%	0.69%

Correlation

The correlation between DIFIX and BIL is -0.08, meaning there is essentially no relationship between their price movements. Each responds to its own set of market drivers, making them strong candidates for combining in a diversified portfolio.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	-0.08
Correlation (3Y) Calculated over the trailing 3-year period	-0.04
Correlation (5Y) Calculated over the trailing 5-year period	0.01
Correlation (10Y) Calculated over the trailing 10-year period	0.01
Correlation (All Time) Calculated using the full available price history since May 31, 2007	-0.02

Return for Risk

DIFIX vs. BIL — Risk / Return Rank

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

DIFIX

DIFIX Risk / Return Rank: 60
DIFIX Sharpe Ratio Rank: 61
DIFIX Sortino Ratio Rank: 67
DIFIX Omega Ratio Rank: 66
DIFIX Calmar Ratio Rank: 49
DIFIX Martin Ratio Rank: 57

BIL

BIL Risk / Return Rank: 100
BIL Sharpe Ratio Rank: 100
BIL Sortino Ratio Rank: 100
BIL Omega Ratio Rank: 100
BIL Calmar Ratio Rank: 100
BIL Martin Ratio Rank: 100

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.

DIFIX vs. BIL - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for MFS Diversified Income Fund (DIFIX) and SPDR Bloomberg 1-3 Month T-Bill ETF (BIL). 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.

	DIFIX	BIL	Difference
Sharpe ratio Return per unit of total volatility	2.30	19.71	-17.40
Sortino ratio Return per unit of downside risk	3.40	174.16	-170.76
Omega ratio Gain probability vs. loss probability	1.45	87.91	-86.46
Calmar ratio Return relative to maximum drawdown	2.67	355.62	-352.95
Martin ratio Return relative to average drawdown	11.42	2,825.49	-2,814.08
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

DIFIX vs. BIL - Sharpe Ratio Comparison

The current DIFIX Sharpe Ratio is 2.30, which is lower than the BIL Sharpe Ratio of 19.71. The chart below compares the historical Sharpe Ratios of DIFIX and BIL, calculated using daily returns over the previous 12 months. A higher Sharpe Ratio indicates better risk-adjusted performance relative to the risk-free rate.

Sharpe Ratios by Period

	DIFIX	BIL	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.30	19.71	-17.40
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.47	13.15	-12.68
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.65	8.52	-7.86
Sharpe Ratio (All Time) Calculated using the full available price history	0.66	2.77	-2.12

Drawdowns

DIFIX vs. BIL - Drawdown Comparison

The maximum DIFIX drawdown since its inception was -35.04%, which is greater than BIL's maximum drawdown of -0.78%. Use the drawdown chart below to compare losses from any high point for DIFIX and BIL.

Drawdown Indicators

	DIFIX	BIL	Difference
Max Drawdown Largest peak-to-trough decline	-35.04%	-0.78%	-34.26%
Max Drawdown (1Y) Largest decline over 1 year	-4.48%	-0.01%	-4.47%
Max Drawdown (3Y) Largest decline over 3 years	-7.29%	-0.01%	-7.28%
Max Drawdown (5Y) Largest decline over 5 years	-19.70%	-0.10%	-19.60%
Max Drawdown (10Y) Largest decline over 10 years	-23.69%	-0.21%	-23.48%
Current Drawdown Current decline from peak	-0.27%	-0.01%	-0.26%
Average Drawdown Average peak-to-trough decline	-3.86%	-0.26%	-3.60%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.05%	0.00%	+1.05%

Volatility

DIFIX vs. BIL - Volatility Comparison

MFS Diversified Income Fund (DIFIX) has a higher volatility of 1.61% compared to SPDR Bloomberg 1-3 Month T-Bill ETF (BIL) at 0.05%. This indicates that DIFIX's price experiences larger fluctuations and is considered to be riskier than BIL based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	DIFIX	BIL	Difference
Volatility (1M) Calculated over the trailing 1-month period	1.61%	0.05%	+1.56%
Volatility (6M) Calculated over the trailing 6-month period	3.88%	0.13%	+3.75%
Volatility (1Y) Calculated over the trailing 1-year period	5.00%	0.20%	+4.80%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	6.84%	0.26%	+6.58%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	7.51%	0.26%	+7.25%

DIFIX vs. BIL - Expense Ratio Comparison

DIFIX has a 0.73% expense ratio, which is higher than BIL's 0.14% expense ratio.

Dividends

DIFIX vs. BIL - Dividend Comparison

DIFIX's dividend yield for the trailing twelve months is around 5.75%, more than BIL's 3.86% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
BIL SPDR Bloomberg 1-3 Month T-Bill ETF	3.86%	4.13%	5.03%	4.92%	1.35%	0.00%	0.30%	2.05%	1.66%	0.68%	0.07%	0.00%
DIFIX MFS Diversified Income Fund	5.75%	5.62%	3.86%	3.12%	3.99%	4.95%	2.83%	3.13%	4.39%	3.79%	3.76%	7.57%

Frequently Asked Questions

Can I hold both DIFIX and BIL in my portfolio?

DIFIX and BIL have a correlation of -0.08, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, DIFIX or BIL?

DIFIX has higher volatility (1.61%) compared to BIL (0.05%). In terms of maximum drawdown, DIFIX dropped -35.04% vs BIL's -0.78%.

Which has better risk-adjusted returns?

BIL currently has the higher Sharpe Ratio (19.71 vs 2.30), 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.