GIMFX vs. IFAFX

Last updated Jun 23, 2026

GIMFX (GMO Implementation Fund) and IFAFX (American Funds Income Fund of America Class F1) are both Global Allocation funds. Over the past 10 years, GIMFX returned 7.15%/yr vs 8.31%/yr for IFAFX. A 0.78 correlation means they provide meaningful diversification when combined. GIMFX charges 0.02%/yr vs 0.63%/yr for IFAFX.

Performance

GIMFX vs. IFAFX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in GMO Implementation Fund (GIMFX) and American Funds Income Fund of America Class F1 (IFAFX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, GIMFX achieves a 12.40% return, which is significantly higher than IFAFX's 5.47% return. Over the past 10 years, GIMFX has underperformed IFAFX with an annualized return of 7.15%, while IFAFX has yielded a comparatively higher 8.31% annualized return.

GIMFX

• 1D: 0.12%
• 1M: 0.47%
• YTD: 12.40%
• 6M: 13.14%
• 1Y: 30.01%
• 3Y*: 16.20%
• 5Y*: 9.87%
• 10Y*: 7.15%

IFAFX

• 1D: -0.40%
• 1M: -1.00%
• YTD: 5.47%
• 6M: 5.55%
• 1Y: 14.17%
• 3Y*: 12.72%
• 5Y*: 8.02%
• 10Y*: 8.31%

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

GIMFX vs. IFAFX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
GIMFX GMO Implementation Fund	12.40%	25.37%	2.67%	14.75%	-1.24%	4.05%	-7.25%	13.24%	-5.58%	14.09%
IFAFX American Funds Income Fund of America Class F1	5.47%	17.71%	10.76%	6.76%	-6.48%	17.28%	4.40%	18.41%	-5.33%	12.48%

Correlation

The correlation between GIMFX and IFAFX is 0.77, which is moderate. They share some common price drivers but move independently often enough to provide real diversification benefit when combined.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.77
Correlation (3Y) Calculated over the trailing 3-year period	0.78
Correlation (5Y) Calculated over the trailing 5-year period	0.73
Correlation (10Y) Calculated over the trailing 10-year period	0.74
Correlation (All Time) Calculated using the full available price history since Jan 2, 2013	0.78

The correlation between GIMFX and IFAFX has been stable across timeframes, ranging from 0.73 to 0.78 - a consistent structural relationship.

Return for Risk

GIMFX vs. IFAFX — Risk / Return Rank

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

GIMFX

GIMFX Risk / Return Rank: 94
GIMFX Sharpe Ratio Rank: 98
GIMFX Sortino Ratio Rank: 96
GIMFX Omega Ratio Rank: 94
GIMFX Calmar Ratio Rank: 92
GIMFX Martin Ratio Rank: 92

IFAFX

IFAFX Risk / Return Rank: 46
IFAFX Sharpe Ratio Rank: 50
IFAFX Sortino Ratio Rank: 50
IFAFX Omega Ratio Rank: 47
IFAFX Calmar Ratio Rank: 41
IFAFX Martin Ratio Rank: 43

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.

GIMFX vs. IFAFX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for GMO Implementation Fund (GIMFX) and American Funds Income Fund of America Class F1 (IFAFX). 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.

	GIMFX	IFAFX	Difference
Sharpe ratio: Return per unit of total volatility	3.61	1.92	+1.69
Sortino ratio: Return per unit of downside risk	5.08	2.72	+2.36
Omega ratio: Gain probability vs. loss probability	1.72	1.34	+0.38
Calmar ratio: Return relative to maximum drawdown	4.54	2.33	+2.21
Martin ratio: Return relative to average drawdown	17.34	8.59	+8.75

GIMFX vs. IFAFX - Sharpe Ratio Comparison

The current GIMFX Sharpe Ratio is 3.61, which is higher than the IFAFX Sharpe Ratio of 1.92. The chart below compares the historical Sharpe Ratios of GIMFX and IFAFX, calculated using daily returns over the previous 12 months. A higher Sharpe Ratio indicates better risk-adjusted performance relative to the risk-free rate.

Drawdowns

GIMFX vs. IFAFX - Drawdown Comparison

The maximum GIMFX drawdown since its inception was -25.87%, smaller than the maximum IFAFX drawdown of -41.90%. Use the drawdown chart below to compare losses from any high point for GIMFX and IFAFX.

Drawdown Indicators

	GIMFX	IFAFX	Difference
Max Drawdown Largest peak-to-trough decline	-25.87%	-41.90%	+16.03%
Max Drawdown (1Y) Largest decline over 1 year	-6.53%	-6.11%	-0.42%
Max Drawdown (3Y) Largest decline over 3 years	-8.02%	-8.63%	+0.61%
Max Drawdown (5Y) Largest decline over 5 years	-13.20%	-15.84%	+2.64%
Max Drawdown (10Y) Largest decline over 10 years	-25.87%	-26.13%	+0.26%
Current Drawdown Current decline from peak	-1.54%	-1.99%	+0.45%
Average Drawdown Average peak-to-trough decline	-4.28%	-3.92%	-0.36%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.71%	1.65%	+0.06%

Volatility

GIMFX vs. IFAFX - Volatility Comparison

GMO Implementation Fund (GIMFX) has a higher volatility of 2.74% compared to American Funds Income Fund of America Class F1 (IFAFX) at 2.28%. This indicates that GIMFX's price experiences larger fluctuations and is considered to be riskier than IFAFX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	GIMFX	IFAFX	Difference
Volatility (1M) Calculated over the trailing 1-month period	2.74%	2.28%	+0.46%
Volatility (6M) Calculated over the trailing 6-month period	6.58%	5.81%	+0.77%
Volatility (1Y) Calculated over the trailing 1-year period	8.21%	7.39%	+0.82%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	8.62%	9.50%	-0.88%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	8.99%	10.69%	-1.70%

GIMFX vs. IFAFX - Expense Ratio Comparison

GIMFX has a 0.02% expense ratio, which is lower than IFAFX's 0.63% expense ratio.

Dividends

GIMFX vs. IFAFX - Dividend Comparison

GIMFX's dividend yield for the trailing twelve months is around 3.80%, less than IFAFX's 9.51% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
GIMFX GMO Implementation Fund	3.80%	4.28%	3.39%	5.93%	3.59%	3.28%	2.25%	3.99%	4.59%	2.95%	1.98%	0.00%
IFAFX American Funds Income Fund of America Class F1	9.51%	9.91%	6.33%	2.90%	6.94%	6.61%	2.76%	4.95%	7.39%	4.20%	3.01%	5.02%

Frequently Asked Questions

Can I hold both GIMFX and IFAFX in my portfolio?

GIMFX and IFAFX have a correlation of 0.77, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, GIMFX or IFAFX?

GIMFX has higher volatility (2.74%) compared to IFAFX (2.28%). In terms of maximum drawdown, GIMFX dropped -25.87% vs IFAFX's -41.90%.

Which has better risk-adjusted returns?

GIMFX currently has the higher Sharpe Ratio (3.61 vs 1.92), 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.