Data as of Oct 28, 2026.
IBDT vs IBDU: Differences, Returns & Fees
On Jul 31, 2026 IBDT's duration was 1.7 years and IBDU's 2.6; both charge 0.10%.
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Net assets on Oct 27, 2026: $4.1bn for iShares iBonds Dec 2028 Term Corporate ETF and $4.0bn for iShares iBonds Dec 2029 Term Corporate ETF.
Pair scorecard
Both cost 0.10% a year; their one-year returns differ by 1.0 point.
Points (pts) are percentage points.
| Measure | IBDT | IBDU |
|---|---|---|
| Return | ||
| Total return, 1 year | +2.3% | +1.3% |
| Benchmark | ||
| What it tracks | Bloomberg December 2028 Maturity Corporate Index | Bloomberg December 2029 Maturity Corporate Index |
| Cost and size | ||
| Expense ratio | 0.10% | 0.10% |
| Net assets, as of Oct 27, 2026 | $4.1bn | $4.0bn |
| Holdings | ||
| Holdings in common | 0% | |
Holdings in common uses holdings dated Jul 31, 2026. Method
Risk and return
Sep 27, 2019 to Oct 23, 2026 · 369 weekly returns · each against IUSBIBDT returned slightly more: +17.3% to +16.3%. IBDT swung slightly less: 7.9% to 8.3%. IBDT fell slightly less at its worst: −17.8% to −18.9%.
Full scorecard
19 measures, with how each is measured Open ↓
| Measure | IBDT | IBDU | IUSB | Edge | How it is measured |
|---|---|---|---|---|---|
| Return | |||||
| Total return | +17.3% | +16.3% | IBDT (slight) | Price change plus distributions, reinvested. | |
| Annualized | +2.3% | +2.1% | IBDT (slight) | Total return as a yearly rate. | |
| Price return | −9.6% | −10.3% | IBDT (slight) | Price change alone, distributions left out. | |
| Risk | |||||
| Volatility | 7.9% | 8.3% | IBDT (slight) | Spread of weekly returns, annualized. Lower is steadier. | |
| Downside deviation | 6.1% | 6.4% | IBDT (slight) | Like volatility, counting only weeks below the Treasury bill rate. | |
| Max drawdown | −17.8% | −18.9% | IBDT (slight) | Deepest fall from a high to the low after it. | |
| Upside capture | 91.8% | 109.0% | 100.0% | IBDU | Share of its benchmark's rise caught in the weeks it rose. |
| Downside capture | 85.2% | 100.2% | 100.0% | IBDT | Share of its benchmark's fall taken in the weeks it fell. Lower is better. |
| Beta | 1.10 | 1.21 | 1.00 | IBDT lower | How far it moves for each 1% its benchmark moves. |
| R squared | 0.74 | 0.80 | 1.00 | Not an edge | Share of its weekly moves its benchmark explains. |
| Risk-adjusted | |||||
| Sharpe | −0.04 | −0.05 | IBDT (slight) | Return above Treasury bills per unit of volatility. | |
| Sortino | −0.05 | −0.06 | IBDT | Return above Treasury bills per unit of downside deviation. | |
| Treynor | −0.003 | −0.003 | −0.017 | IBDT (slight) | Return above Treasury bills per unit of beta. |
| Calmar | 0.13 | 0.11 | IBDT | Annualized return divided by the max drawdown. | |
| Against the benchmark | |||||
| Benchmark | IUSB | IUSB | IUSB | The ETF each fund is measured against. | |
| Alpha | +1.6% a year | +1.7% a year | 0.0% | Not significant | Yearly return beyond what its beta to the benchmark predicts. |
| Alpha t-stat | 1.05 | 1.21 | Not an edge | How sure the alpha is. Below 2, it could be chance. | |
| Alpha range | −1.4% to +4.6% | −1.1% to +4.4% | Both include zero | The 95% range for the yearly alpha. | |
| Information ratio | 0.35 | 0.34 | IBDT (slight) | Return against its benchmark per unit of tracking error. | |
| Tracking error | 4.1% | 3.9% | 0.0% | Not an edge | How far weekly returns stray from the benchmark, annualized. |
Computed by ETFIQ from Tiingo daily prices and ETFIQ's distribution records, 369 weekly returns. Cash rate: the 13-week Treasury bill.
What they share
By the books each fund has filed, IBDT and IBDU hold 0% of their money in the same securities at the same weight. Holdings dated Jul 31, 2026.
half
0% in common
Only in one fund ↓
Side by side
IBDT and IBDU on the fields both publish, as of Oct 28, 2026. Source: ETFIQ.
IBDT and IBDU are built for the same job. How do they differ in cost, holdings and results?
- What each follows. IBDT follows Bloomberg December 2028 Maturity Corporate Index and IBDU follows Bloomberg December 2029 Maturity Corporate Index.
- Holdings in common. 0% of the weight is in the same securities (holdings dated Jul 31, 2026).
- One-year total return (similar). Over 1 year to Oct 28, 2026 IBDT returned +2.3% and IBDU +1.3% with distributions reinvested, a gap of 1.0 points.
Data as of Oct 28, 2026.
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IBDT
IBDT tracks an index. Over the year to Oct 28, 2026 it returned +2.3% with distributions reinvested, against −1.2% for its benchmark, the Bloomberg U.S. Universal Index. The prospectus expense ratio is 0.10% a year.
IBDU
IBDU tracks an index. Over the year to Oct 28, 2026 it returned +1.3% with distributions reinvested, against −1.2% for its benchmark, the Bloomberg U.S. Universal Index.
Questions people ask
Links are sources, not endorsements. A comparison is not a recommendation.
How this is computed
Overlap adds up the smaller of the two weights for each security both funds hold.
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ETFIQ, IBDT against IBDU, data as of Oct 28, 2026. https://etfiq.com/compare/any/ibdt-vs-ibdu
ETFIQ. (Oct 28, 2026). IBDT against IBDU. Retrieved from https://etfiq.com/compare/any/ibdt-vs-ibdu
[IBDT against IBDU (ETFIQ, Oct 28, 2026)](https://etfiq.com/compare/any/ibdt-vs-ibdu)
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