IRSOX vs. MXBGX

Last updated Jul 18, 2026

IRSOX (Voya Target Retirement 2040 Fund) and MXBGX (Great-West Lifetime 2040 Fund) are both Target Retirement Date funds. Over the past 10 years, IRSOX returned 10.84%/yr vs 9.38%/yr for MXBGX. Their correlation of 0.83 suggests significant overlap in exposure. IRSOX charges 0.23%/yr vs 0.11%/yr for MXBGX.

Performance

IRSOX vs. MXBGX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Voya Target Retirement 2040 Fund (IRSOX) and Great-West Lifetime 2040 Fund (MXBGX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, IRSOX achieves a 10.17% return, which is significantly higher than MXBGX's 9.46% return. Over the past 10 years, IRSOX has outperformed MXBGX with an annualized return of 10.84%, while MXBGX has yielded a comparatively lower 9.38% annualized return.

IRSOX

• 1D: -0.58%
• 1M: 0.12%
• 6M: 7.59%
• YTD: 10.17%
• 1Y: 19.97%
• 3Y*: 16.12%
• 5Y*: 9.01%
• 10Y*: 10.84%

MXBGX

• 1D: 0.31%
• 1M: 0.15%
• 6M: 6.93%
• YTD: 9.46%
• 1Y: 17.73%
• 3Y*: 13.66%
• 5Y*: 7.51%
• 10Y*: 9.38%

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

IRSOX vs. MXBGX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
IRSOX Voya Target Retirement 2040 Fund	10.17%	19.10%	13.74%	19.25%	-18.43%	17.65%	16.93%	23.69%	-8.31%	20.15%
MXBGX Great-West Lifetime 2040 Fund	9.46%	16.19%	10.17%	16.47%	-15.90%	15.69%	13.61%	25.22%	-9.48%	18.42%

Correlation

The correlation between IRSOX and MXBGX is 0.85, indicating a strong positive relationship between their price movements. Combining them offers limited diversification - they tend to fall together during downturns.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.85
Correlation (3Y) Calculated over the trailing 3-year period	0.88
Correlation (5Y) Calculated over the trailing 5-year period	0.88
Correlation (10Y) Calculated over the trailing 10-year period	0.83
Correlation (All Time) Calculated using the full available price history since May 4, 2016	0.83

The correlation between IRSOX and MXBGX has been stable across timeframes, ranging from 0.83 to 0.88 - a consistent structural relationship.

Return for Risk

IRSOX vs. MXBGX — Risk / Return Rank

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

IRSOX

IRSOX Risk / Return Rank: 74
IRSOX Sharpe Ratio Rank: 72
IRSOX Sortino Ratio Rank: 73
IRSOX Omega Ratio Rank: 70
IRSOX Calmar Ratio Rank: 70
IRSOX Martin Ratio Rank: 84

MXBGX

MXBGX Risk / Return Rank: 49
MXBGX Sharpe Ratio Rank: 45
MXBGX Sortino Ratio Rank: 45
MXBGX Omega Ratio Rank: 47
MXBGX Calmar Ratio Rank: 50
MXBGX Martin Ratio Rank: 57

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.

IRSOX vs. MXBGX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Voya Target Retirement 2040 Fund (IRSOX) and Great-West Lifetime 2040 Fund (MXBGX). 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.

	IRSOX	MXBGX	Difference
Sharpe ratio: Return per unit of total volatility	1.94	1.59	+0.35
Sortino ratio: Return per unit of downside risk	2.80	2.26	+0.54
Omega ratio: Gain probability vs. loss probability	1.36	1.30	+0.06
Calmar ratio: Return relative to maximum drawdown	2.68	2.28	+0.39
Martin ratio: Return relative to average drawdown	12.20	9.41	+2.79

IRSOX vs. MXBGX - Sharpe Ratio Comparison

The current IRSOX Sharpe Ratio is 1.94, which is comparable to the MXBGX Sharpe Ratio of 1.59. The chart below compares the historical Sharpe Ratios of IRSOX and MXBGX, 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

IRSOX vs. MXBGX - Drawdown Comparison

The maximum IRSOX drawdown since its inception was -31.25%, roughly equal to the maximum MXBGX drawdown of -30.12%. Use the drawdown chart below to compare losses from any high point for IRSOX and MXBGX.

Drawdown Indicators

	IRSOX	MXBGX	Difference
Max Drawdown Largest peak-to-trough decline	-31.25%	-30.12%	-1.13%
Max Drawdown (1Y) Largest decline over 1 year	-8.38%	-7.98%	-0.40%
Max Drawdown (3Y) Largest decline over 3 years	-13.84%	-13.05%	-0.79%
Max Drawdown (5Y) Largest decline over 5 years	-25.24%	-28.13%	+2.89%
Max Drawdown (10Y) Largest decline over 10 years	-31.25%	-30.12%	-1.13%
Current Drawdown Current decline from peak	-1.33%	-0.46%	-0.87%
Average Drawdown Average peak-to-trough decline	-4.26%	-5.55%	+1.29%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.77%	1.93%	-0.16%

Volatility

IRSOX vs. MXBGX - Volatility Comparison

Voya Target Retirement 2040 Fund (IRSOX) has a higher volatility of 3.23% compared to Great-West Lifetime 2040 Fund (MXBGX) at 2.77%. This indicates that IRSOX's price experiences larger fluctuations and is considered to be riskier than MXBGX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	IRSOX	MXBGX	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.23%	2.77%	+0.46%
Volatility (6M) Calculated over the trailing 6-month period	9.42%	8.74%	+0.68%
Volatility (1Y) Calculated over the trailing 1-year period	11.57%	11.49%	+0.08%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	13.99%	14.50%	-0.51%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	14.75%	15.05%	-0.30%

IRSOX vs. MXBGX - Expense Ratio Comparison

IRSOX has a 0.23% expense ratio, which is higher than MXBGX's 0.11% expense ratio. However, both funds are considered low-cost compared to the broader market, where average expense ratios usually range from 0.3% to 0.9%.

Dividends

IRSOX vs. MXBGX - Dividend Comparison

IRSOX's dividend yield for the trailing twelve months is around 12.44%, more than MXBGX's 4.58% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
IRSOX Voya Target Retirement 2040 Fund	12.44%	13.71%	2.25%	2.13%	6.01%	17.52%	3.71%	4.14%	5.84%	5.86%	1.98%	0.41%
MXBGX Great-West Lifetime 2040 Fund	4.58%	5.02%	6.86%	5.77%	11.05%	10.66%	6.43%	9.53%	7.86%	5.21%	0.00%	0.00%

Frequently Asked Questions

Can I hold both IRSOX and MXBGX in my portfolio?

IRSOX and MXBGX have a correlation of 0.85, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, IRSOX or MXBGX?

IRSOX has higher volatility (3.23%) compared to MXBGX (2.77%). In terms of maximum drawdown, IRSOX dropped -31.25% vs MXBGX's -30.12%.

Which has better risk-adjusted returns?

IRSOX currently has the higher Sharpe Ratio (1.94 vs 1.59), 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.