IBTF vs. OBIL

Last updated Jun 3, 2026

IBTF (iShares iBonds Dec 2025 Term Treasury ETF) and OBIL (US Treasury 12 Month Bill ETF) are both Government Bonds funds - IBTF tracks the ICE 2025 Maturity US Treasury Index while OBIL tracks the ICE BofA US 1-Year Treasury Bill Index - Benchmark TR Gross. Both are passively managed. Over the past 3 years, IBTF returned 3.66%/yr vs 4.55%/yr for OBIL. A 0.51 correlation means they provide meaningful diversification when combined. IBTF charges 0.07%/yr vs 0.15%/yr for OBIL.

Performance

IBTF vs. OBIL - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in iShares iBonds Dec 2025 Term Treasury ETF (IBTF) and US Treasury 12 Month Bill ETF (OBIL). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

IBTF

• 1D: 0.00%
• 1M: 0.00%
• YTD: 0.00%
• 6M: 0.09%
• 1Y: 2.14%
• 3Y*: 3.66%
• 5Y*: 0.90%
• 10Y*: —

OBIL

• 1D: 0.02%
• 1M: 0.24%
• YTD: 1.17%
• 6M: 1.53%
• 1Y: 3.83%
• 3Y*: 4.55%
• 5Y*: —
• 10Y*: —

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

IBTF vs. OBIL - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022
IBTF iShares iBonds Dec 2025 Term Treasury ETF	0.00%	3.81%	4.60%	4.12%	0.28%
OBIL US Treasury 12 Month Bill ETF	1.17%	4.19%	4.94%	4.69%	0.53%

Correlation

The correlation between IBTF and OBIL is 0.06, 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	0.06
Correlation (3Y) Calculated over the trailing 3-year period	0.44
Correlation (All Time) Calculated using the full available price history since Nov 16, 2022	0.51

Over the past year, the correlation between IBTF and OBIL has dropped to 0.06 - well below their long-term average of 0.51, suggesting their price drivers have been diverging.

Return for Risk

IBTF vs. OBIL — Risk / Return Rank

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

IBTF

IBTF Risk / Return Rank: 99
IBTF Sharpe Ratio Rank: 99
IBTF Sortino Ratio Rank: 99
IBTF Omega Ratio Rank: 100
IBTF Calmar Ratio Rank: 100
IBTF Martin Ratio Rank: 99

OBIL

OBIL Risk / Return Rank: 99
OBIL Sharpe Ratio Rank: 99
OBIL Sortino Ratio Rank: 99
OBIL Omega Ratio Rank: 99
OBIL Calmar Ratio Rank: 99
OBIL Martin Ratio Rank: 99

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.

IBTF vs. OBIL - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for iShares iBonds Dec 2025 Term Treasury ETF (IBTF) and US Treasury 12 Month Bill ETF (OBIL). 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.

	IBTF	OBIL	Difference
Sharpe ratio Return per unit of total volatility	7.08	7.07	0.00
Sortino ratio Return per unit of downside risk	20.07	16.19	+3.88
Omega ratio Gain probability vs. loss probability	6.23	3.70	+2.53
Calmar ratio Return relative to maximum drawdown	64.70	27.64	+37.06
Martin ratio Return relative to average drawdown	219.02	151.12	+67.90
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

IBTF vs. OBIL - Sharpe Ratio Comparison

The current IBTF Sharpe Ratio is 7.08, which is comparable to the OBIL Sharpe Ratio of 7.07. The chart below compares the historical Sharpe Ratios of IBTF and OBIL, 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

	IBTF	OBIL	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	7.08	7.07	0.00
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.39	—	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.44	5.38	-4.93

Drawdowns

IBTF vs. OBIL - Drawdown Comparison

The maximum IBTF drawdown since its inception was -10.45%, which is greater than OBIL's maximum drawdown of -0.33%. Use the drawdown chart below to compare losses from any high point for IBTF and OBIL.

Drawdown Indicators

	IBTF	OBIL	Difference
Max Drawdown Largest peak-to-trough decline	-10.45%	-0.33%	-10.12%
Max Drawdown (1Y) Largest decline over 1 year	-0.04%	-0.14%	+0.10%
Max Drawdown (3Y) Largest decline over 3 years	-0.67%	-0.21%	-0.46%
Max Drawdown (5Y) Largest decline over 5 years	-9.53%	—	—
Current Drawdown Current decline from peak	0.00%	0.00%	0.00%
Average Drawdown Average peak-to-trough decline	-3.33%	-0.03%	-3.30%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.01%	0.03%	-0.02%

Volatility

IBTF vs. OBIL - Volatility Comparison

The current volatility for iShares iBonds Dec 2025 Term Treasury ETF (IBTF) is 0.00%, while US Treasury 12 Month Bill ETF (OBIL) has a volatility of 0.11%. This indicates that IBTF experiences smaller price fluctuations and is considered to be less risky than OBIL based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	IBTF	OBIL	Difference
Volatility (1M) Calculated over the trailing 1-month period	0.00%	0.11%	-0.11%
Volatility (6M) Calculated over the trailing 6-month period	0.19%	0.33%	-0.14%
Volatility (1Y) Calculated over the trailing 1-year period	0.36%	0.54%	-0.18%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	2.38%	0.82%	+1.56%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	2.56%	0.82%	+1.74%

IBTF vs. OBIL - Expense Ratio Comparison

IBTF has a 0.07% expense ratio, which is lower than OBIL's 0.15% 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

IBTF vs. OBIL - Dividend Comparison

IBTF's dividend yield for the trailing twelve months is around 2.08%, less than OBIL's 3.65% yield.

Position	TTM	2025	2024	2023	2022	2021	2020
IBTF iShares iBonds Dec 2025 Term Treasury ETF	2.08%	3.83%	4.32%	4.03%	1.93%	0.57%	0.59%
OBIL US Treasury 12 Month Bill ETF	3.65%	3.83%	4.56%	4.92%	0.52%	0.00%	0.00%

Frequently Asked Questions

Can I hold both IBTF and OBIL in my portfolio?

IBTF and OBIL have a correlation of 0.06, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, IBTF or OBIL?

OBIL has higher volatility (0.11%) compared to IBTF (0.00%). In terms of maximum drawdown, IBTF dropped -10.45% vs OBIL's -0.33%.

Which ETF is better, IBTF or OBIL?

On 3-year performance, OBIL leads with 4.55% vs 3.66% for IBTF. On fees, IBTF is cheaper at 0.07% per year. On volatility, IBTF has been the lower-risk option at 0.00%. The better choice depends on whether you care most about return, fees, risk, or income.

Which ETF has performed better, IBTF or OBIL?

Over the 3-year period, OBIL has performed better with a 4.55% return vs 3.66%. Past performance does not guarantee future results, so compare this with risk, fees, and fund exposure.

Which ETF is cheaper, IBTF or OBIL?

IBTF is cheaper with a 0.07% expense ratio, compared with 0.15% for OBIL.

Which ETF pays a higher dividend yield, IBTF or OBIL?

OBIL has the higher dividend yield at 3.65%, compared with 2.08% for IBTF.

What is the main difference between IBTF and OBIL?

IBTF tracks ICE 2025 Maturity US Treasury Index, while OBIL tracks ICE BofA US 1-Year Treasury Bill Index - Benchmark TR Gross. They also come from different issuers: iShares and US Benchmark Series. Their fees differ too: 0.07% for IBTF and 0.15% for OBIL.

Which has better risk-adjusted returns?

IBTF currently has the higher Sharpe Ratio (7.08 vs 7.07), 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.