TBIIX vs. BIL

Last updated Jun 23, 2026

TBIIX (TIAA-CREF Bond Index Fund) and BIL (SPDR Bloomberg 1-3 Month T-Bill ETF) are both funds - TBIIX is a Intermediate Core Bond fund managed by TIAA Investments, while BIL is a Government Bonds fund tracking the Bloomberg 1-3 Month U.S. Treasury Bill Index. Over the past 10 years, TBIIX returned 1.40%/yr vs 2.20%/yr for BIL. At a 0.02 correlation, their price movements are largely independent. TBIIX charges 0.07%/yr vs 0.14%/yr for BIL.

Performance

TBIIX vs. BIL - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in TIAA-CREF Bond Index Fund (TBIIX) 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, TBIIX achieves a 0.41% return, which is significantly lower than BIL's 1.66% return. Over the past 10 years, TBIIX has underperformed BIL with an annualized return of 1.40%, while BIL has yielded a comparatively higher 2.20% annualized return.

TBIIX

• 1D: 0.21%
• 1M: 0.86%
• YTD: 0.41%
• 6M: 0.74%
• 1Y: 4.71%
• 3Y*: 3.85%
• 5Y*: -0.28%
• 10Y*: 1.40%

BIL

• 1D: 0.00%
• 1M: 0.27%
• YTD: 1.66%
• 6M: 1.75%
• 1Y: 3.85%
• 3Y*: 4.60%
• 5Y*: 3.45%
• 10Y*: 2.20%

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

TBIIX vs. BIL - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
TBIIX TIAA-CREF Bond Index Fund	0.41%	7.12%	1.13%	5.13%	-13.61%	-1.81%	7.69%	8.58%	-0.25%	3.43%
BIL SPDR Bloomberg 1-3 Month T-Bill ETF	1.66%	4.15%	5.19%	4.94%	1.40%	-0.10%	0.40%	2.03%	1.74%	0.69%

Correlation

The correlation between TBIIX and BIL is -0.17, meaning they tend to move in opposite directions. This is especially valuable for risk management - when one declines, the other has historically tended to hold steady or rise.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	-0.17
Correlation (3Y) Calculated over the trailing 3-year period	-0.07
Correlation (5Y) Calculated over the trailing 5-year period	0.02
Correlation (10Y) Calculated over the trailing 10-year period	0.02
Correlation (All Time) Calculated using the full available price history since Jan 4, 2010	0.02

The correlation between TBIIX and BIL shifts across timeframes, from -0.17 (1 year) to 0.02 (10 years), reflecting how their relationship changes across market environments.

Return for Risk

TBIIX vs. BIL — Risk / Return Rank

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

TBIIX

TBIIX Risk / Return Rank: 21
TBIIX Sharpe Ratio Rank: 21
TBIIX Sortino Ratio Rank: 21
TBIIX Omega Ratio Rank: 19
TBIIX Calmar Ratio Rank: 22
TBIIX Martin Ratio Rank: 20

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.

TBIIX vs. BIL - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for TIAA-CREF Bond Index Fund (TBIIX) 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.

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.

	TBIIX	BIL	Difference
Sharpe ratio: Return per unit of total volatility	1.21	19.37	-18.16
Sortino ratio: Return per unit of downside risk	1.80	173.17	-171.36
Omega ratio: Gain probability vs. loss probability	1.21	87.41	-86.20
Calmar ratio: Return relative to maximum drawdown	1.62	353.28	-351.66
Martin ratio: Return relative to average drawdown	4.66	2,801.35	-2,796.69

TBIIX vs. BIL - Sharpe Ratio Comparison

The current TBIIX Sharpe Ratio is 1.21, which is lower than the BIL Sharpe Ratio of 19.37. The chart below compares the historical Sharpe Ratios of TBIIX 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.

Drawdowns

TBIIX vs. BIL - Drawdown Comparison

The maximum TBIIX drawdown since its inception was -19.33%, which is greater than BIL's maximum drawdown of -0.78%. Use the drawdown chart below to compare losses from any high point for TBIIX and BIL.

Drawdown Indicators

	TBIIX	BIL	Difference
Max Drawdown Largest peak-to-trough decline	-19.33%	-0.78%	-18.55%
Max Drawdown (1Y) Largest decline over 1 year	-2.99%	-0.01%	-2.98%
Max Drawdown (3Y) Largest decline over 3 years	-6.17%	-0.01%	-6.16%
Max Drawdown (5Y) Largest decline over 5 years	-18.68%	-0.09%	-18.59%
Max Drawdown (10Y) Largest decline over 10 years	-19.33%	-0.21%	-19.12%
Current Drawdown Current decline from peak	-3.49%	0.00%	-3.49%
Average Drawdown Average peak-to-trough decline	-3.68%	-0.26%	-3.42%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.04%	0.00%	+1.04%

Volatility

TBIIX vs. BIL - Volatility Comparison

TIAA-CREF Bond Index Fund (TBIIX) has a higher volatility of 1.23% compared to SPDR Bloomberg 1-3 Month T-Bill ETF (BIL) at 0.07%. This indicates that TBIIX'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

	TBIIX	BIL	Difference
Volatility (1M) Calculated over the trailing 1-month period	1.23%	0.07%	+1.16%
Volatility (6M) Calculated over the trailing 6-month period	2.95%	0.14%	+2.81%
Volatility (1Y) Calculated over the trailing 1-year period	4.01%	0.20%	+3.81%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	6.08%	0.26%	+5.82%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	5.02%	0.26%	+4.76%

TBIIX vs. BIL - Expense Ratio Comparison

TBIIX has a 0.07% expense ratio, which is lower than BIL's 0.14% expense ratio. Despite the difference, both funds are considered low-cost compared to the broader market, where average expense ratios usually range from 0.3% to 0.9%.

Dividends

TBIIX vs. BIL - Dividend Comparison

TBIIX's dividend yield for the trailing twelve months is around 3.90%, more than BIL's 3.85% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
BIL SPDR Bloomberg 1-3 Month T-Bill ETF	3.85%	4.13%	5.03%	4.92%	1.35%	0.00%	0.30%	2.05%	1.66%	0.68%	0.07%	0.00%
TBIIX TIAA-CREF Bond Index Fund	3.90%	3.73%	3.14%	2.44%	2.11%	2.07%	3.17%	2.82%	2.46%	2.44%	2.31%	2.61%

Frequently Asked Questions

Can I hold both TBIIX and BIL in my portfolio?

TBIIX and BIL have a correlation of -0.17, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, TBIIX or BIL?

TBIIX has higher volatility (1.23%) compared to BIL (0.07%). In terms of maximum drawdown, TBIIX dropped -19.33% vs BIL's -0.78%.

Which has better risk-adjusted returns?

BIL currently has the higher Sharpe Ratio (19.37 vs 1.21), 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.