IBIL vs. TDTF
IBIL (iShares iBonds Oct 2035 Term TIPS ETF) and TDTF (FlexShares iBoxx 5-Year Target Duration TIPS Index Fund) are both Inflation-Protected Bonds funds - IBIL tracks the ICE 2035 Maturity US Treasury TIPS Index while TDTF tracks the iBoxx 5-Year Target Duration TIPS. Both are passively managed. Over the past year, IBIL returned 4.95% vs 3.54% for TDTF. Their correlation of 0.83 suggests significant overlap in exposure. IBIL charges 0.10%/yr vs 0.18%/yr for TDTF.
Performance
IBIL vs. TDTF - Performance Comparison
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Returns By Period
In the year-to-date period, IBIL achieves a 1.24% return, which is significantly higher than TDTF's 0.89% return.
IBIL
- 1D
- 0.54%
- 1M
- 0.26%
- YTD
- 1.24%
- 6M
- 1.14%
- 1Y
- 4.95%
- 3Y*
- —
- 5Y*
- —
- 10Y*
- —
TDTF
- 1D
- 0.25%
- 1M
- -0.25%
- YTD
- 0.89%
- 6M
- 0.91%
- 1Y
- 3.54%
- 3Y*
- 4.34%
- 5Y*
- 1.66%
- 10Y*
- 2.81%
IBIL vs. TDTF - Yearly Performance Comparison
| 2026 (YTD) | 2025 | |
|---|---|---|
IBIL iShares iBonds Oct 2035 Term TIPS ETF | 1.24% | 4.77% |
TDTF FlexShares iBoxx 5-Year Target Duration TIPS Index Fund | 0.89% | 4.26% |
Correlation
The correlation between IBIL and TDTF is 0.82, 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 | 0.82 |
Correlation (All Time) Calculated using the full available price history since Mar 26, 2025 | 0.83 |
The correlation between IBIL and TDTF has been stable across timeframes, ranging from 0.82 to 0.83 - a consistent structural relationship.
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Return for Risk
IBIL vs. TDTF — Risk / Return Rank
IBIL
TDTF
IBIL vs. TDTF - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for iShares iBonds Oct 2035 Term TIPS ETF (IBIL) and FlexShares iBoxx 5-Year Target Duration TIPS Index Fund (TDTF). 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.
| IBIL | TDTF | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | -0.25 | ||
| Sortino ratioReturn per unit of downside risk | -0.41 | ||
| Omega ratioGain probability vs. loss probability | 1.18 | 1.20 | -0.03 |
| Calmar ratioReturn relative to maximum drawdown | 1.80 | 2.25 | -0.44 |
| Martin ratioReturn relative to average drawdown | 4.22 | 6.71 | -2.48 |
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Drawdowns
IBIL vs. TDTF - Drawdown Comparison
The maximum IBIL drawdown since its inception was -5.28%, smaller than the maximum TDTF drawdown of -12.02%. Use the drawdown chart below to compare losses from any high point for IBIL and TDTF.
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Drawdown Indicators
| IBIL | TDTF | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -5.28% | -12.02% | +6.74% |
Max Drawdown (1Y)Largest decline over 1 year | -2.76% | -1.58% | -1.18% |
Max Drawdown (3Y)Largest decline over 3 years | — | -3.79% | — |
Max Drawdown (5Y)Largest decline over 5 years | — | -12.02% | — |
Max Drawdown (10Y)Largest decline over 10 years | — | -12.02% | — |
Current DrawdownCurrent decline from peak | -1.00% | -1.19% | +0.19% |
Average DrawdownAverage peak-to-trough decline | -1.46% | -2.90% | +1.44% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 1.18% | 0.53% | +0.65% |
Volatility
IBIL vs. TDTF - Volatility Comparison
iShares iBonds Oct 2035 Term TIPS ETF (IBIL) has a higher volatility of 1.63% compared to FlexShares iBoxx 5-Year Target Duration TIPS Index Fund (TDTF) at 1.25%. This indicates that IBIL's price experiences larger fluctuations and is considered to be riskier than TDTF based on this measure. The chart below showcases a comparison of their rolling one-month volatility.
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Volatility by Period
| IBIL | TDTF | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 1.63% | 1.25% | +0.38% |
Volatility (6M)Calculated over the trailing 6-month period | 3.26% | 2.23% | +1.03% |
Volatility (1Y)Calculated over the trailing 1-year period | 5.63% | 3.14% | +2.49% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 8.11% | 5.68% | +2.43% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 8.11% | 5.08% | +3.03% |
IBIL vs. TDTF - Expense Ratio Comparison
IBIL has a 0.10% expense ratio, which is lower than TDTF's 0.18% 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
IBIL vs. TDTF - Dividend Comparison
IBIL's dividend yield for the trailing twelve months is around 3.48%, less than TDTF's 4.74% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
IBIL iShares iBonds Oct 2035 Term TIPS ETF | 3.48% | 2.93% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% |
TDTF FlexShares iBoxx 5-Year Target Duration TIPS Index Fund | 4.74% | 4.58% | 3.98% | 3.97% | 7.60% | 4.55% | 1.13% | 1.80% | 2.60% | 2.20% | 1.51% | 0.21% |
Frequently Asked Questions
IBIL and TDTF have a correlation of 0.82, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.
IBIL has higher volatility (1.63%) compared to TDTF (1.25%). In terms of maximum drawdown, IBIL dropped -5.28% vs TDTF's -12.02%.
On 1-year performance, IBIL leads with 4.95% vs 3.54% for TDTF. On fees, IBIL is cheaper at 0.10% per year. On volatility, TDTF has been the lower-risk option at 1.25%. The better choice depends on whether you care most about return, fees, risk, or income.
Over the 1-year period, IBIL has performed better with a 4.95% return vs 3.54%. Past performance does not guarantee future results, so compare this with risk, fees, and fund exposure.
IBIL is cheaper with a 0.10% expense ratio, compared with 0.18% for TDTF.
TDTF has the higher dividend yield at 4.74%, compared with 3.48% for IBIL.
IBIL tracks ICE 2035 Maturity US Treasury TIPS Index, while TDTF tracks iBoxx 5-Year Target Duration TIPS. They also come from different issuers: iShares and Northern Trust. Their fees differ too: 0.10% for IBIL and 0.18% for TDTF.
TDTF currently has the higher Sharpe Ratio (1.13 vs 0.88), 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.
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