BND vs AGG vs SCHZ: Which Bond ETF is Best for 2026?
BND vs AGG vs SCHZ: The Definitive U.S. Bond ETF Comparison for Stability
In a market where the S&P 500 hovers above 7,500 and the Nasdaq continues its relentless climb past 26,000, prudent investors are increasingly asking a critical question: where can I find stability? With the 10-Year Treasury yield holding firm at a respectable 4.55%, the role of fixed income as a portfolio ballast has never been more relevant. For most investors, the simplest and most effective way to gain this exposure is through a broad-market bond ETF. This brings us to the three titans of the industry: Vanguard’s BND, iShares’ AGG, and Schwab’s SCHZ.
These three funds represent the go-to choice for core bond exposure, but their near-identical objectives can cause analysis paralysis. This analysis will cut through the noise. We will perform a quantitative, head-to-head comparison of BND vs AGG vs SCHZ, dissecting their underlying indexes, performance history, risk characteristics, and costs to help you determine which of these premier funds deserves a place in your portfolio for the years ahead.
The Core Role of an Aggregate Bond Fund
Before picking an ETF, let’s talk about what an aggregate bond fund actually does. These funds capture the entire U.S. investment-grade bond market in a single ticker. That includes U.S. Treasuries, government mortgage-backed securities (MBS), and corporate bonds.
A core bond fund like BND, AGG, or SCHZ serves three main purposes:
- Diversification: Stocks and bonds often move in opposite directions. When stocks fall, high-quality bonds tend to hold their value or even rise. They act as a crucial shock absorber for your portfolio.
- Income Generation: Bonds pay regular interest. These ETFs bundle thousands of those interest payments and distribute them to you, usually every month. This creates a predictable stream of income.
- Capital Preservation: By focusing on top-tier debt from the U.S. government and major corporations, these funds prioritize the return of your capital over the highest possible return on your capital.
With the benchmark 10-year Treasury note yielding 4.55%, the income these funds provide looks much more attractive than it did a few years ago. Investors are taking notice.
A Head-to-Head Look at the Contenders
At first glance, BND, AGG, and SCHZ look like financial triplets. They are all massive, liquid, and incredibly cheap. They are the household names in the bond indexing world, run by the three biggest players in the ETF industry.
| Metric | Vanguard (BND) | iShares (AGG) | Schwab (SCHZ) |
|---|---|---|---|
| Full Name | Vanguard Total Bond Market ETF | iShares Core U.S. Aggregate Bond ETF | Schwab U.S. Aggregate Bond ETF |
| Issuer | Vanguard | BlackRock | Charles Schwab |
| Expense Ratio | 0.03% | 0.03% | 0.02% |
| Assets (AUM) | ~$350 Billion | ~$335 Billion | ~$110 Billion |
| Benchmark Index | Bloomberg U.S. Aggregate Bond Index | Bloomberg U.S. Aggregate Bond Index | Bloomberg U.S. Aggregate Float Adjusted Index |
| SEC Yield (30-Day) | 4.61% | 4.60% | 4.62% |
| Number of Holdings | ~10,500 | ~10,200 | ~9,800 |
The table reveals a striking family resemblance. The first difference you'll spot is cost. SCHZ undercuts its rivals by a single basis point (0.01%). That might seem tiny, but in the world of index funds, every penny counts. The other key difference is the benchmark index, which deserves a closer look.
Under the Hood: Dissecting the Benchmark Indexes
Why the nearly identical performance? It’s simple. Two of them—BND and AGG—track the exact same index: the Bloomberg U.S. Aggregate Bond Index. Think of it as the S&P 500 for the U.S. bond market.
Schwab's SCHZ, however, tracks the Bloomberg U.S. Aggregate Float Adjusted Index. This is a subtle but important distinction. The “float-adjusted” version kicks out bonds held by the U.S. Federal Reserve. During quantitative easing (QE), the Fed buys huge amounts of Treasuries and MBS. A float-adjusted index ignores these bonds that aren't available for public trading.
What does this mean for you? SCHZ holds slightly more corporate bonds than BND and AGG. This can nudge the yield and risk up a bit. In reality, the performance difference has been tiny.
Performance Deep Dive: A Decade of Data
Talk is cheap. Let's look at the numbers. To see how these subtle differences play out in the real world, we can compare their past returns. The data tells a story of remarkable consistency.
| Period (Annualized Total Return) | BND | AGG | SCHZ |
|---|---|---|---|
| 1-Year | 2.15% | 2.14% | 2.17% |
| 3-Year | -1.88% | -1.89% | -1.86% |
| 5-Year | 0.45% | 0.44% | 0.48% |
| 10-Year | 1.55% | 1.54% | 1.58% |
Note: Hypothetical performance data as of June 30, 2026. Past performance is not indicative of future results.
The results are, as expected, nearly identical. Those negative 3-year returns show what happened when interest rates shot up in 2022-2023. It’s a sharp reminder that even "safe" bond funds have risks. Over ten years, SCHZ edges ahead slightly, almost entirely due to its lower fee. We're talking about a tiny difference each year—not enough to base your whole decision on.
How Does Interest Rate Risk Affect These ETFs?
The biggest threat to any fixed income ETF is interest rate risk. When new bonds are issued with higher interest rates, the value of older, existing bonds falls. The key metric for this is duration. Measured in years, duration tells you how much a fund’s price is likely to drop for every 1% rise in interest rates.
| ETF | Effective Duration |
|---|---|
| BND | 6.3 years |
| AGG | 6.3 years |
| SCHZ | 6.2 years |
Their durations all hover around 6.3 years. So, if interest rates jump 1%, expect these ETFs to drop about 6.3% in value. A 1% rate cut would do the opposite. This sensitivity is a critical concept for every bond investor to grasp, especially if you're worried about rate swings.
Credit Quality and Sector Allocation: Where Are You Actually Invested?
Since these are "aggregate" funds, they are packed with the safest kinds of debt. The vast majority of their holdings are rated AAA, thanks to a huge allocation to U.S. Treasury securities.
Credit Quality Breakdown
| Credit Rating | BND / AGG | SCHZ |
|---|---|---|
| AAA | ~71% | ~70% |
| AA | ~4% | ~4% |
| A | ~12% | ~13% |
| BBB | ~13% | ~13% |
Sector Allocation
| Sector | BND / AGG | SCHZ |
|---|---|---|
| U.S. Treasury | ~42% | ~40% |
| MBS Pass-Through | ~26% | ~25% |
| Industrial Corporate | ~17% | ~18% |
| Financial Corporate | ~9% | ~10% |
| Other | ~6% | ~7% |
The data backs up what we said earlier. SCHZ holds a bit less in Treasuries and MBS and a bit more in corporate bonds. This adds a tiny amount of credit risk, but the difference is academic. All three funds are stuffed with high-quality debt, making them perfect core holdings for conservative investors.
Answering Your Top Questions on Aggregate Bond ETFs
Let's tackle the big questions investors have about these portfolio cornerstones.
Are BND, AGG, or SCHZ good for inflation protection?
No, not directly. These funds hold standard bonds with fixed payments that don't adjust for inflation. When inflation is high, your real (inflation-adjusted) return can be negative. For direct inflation protection, look at Treasury Inflation-Protected Securities (TIPS) or ETFs that hold them, like VTIP or SCHP. Still, these funds have a place. Central banks fight inflation by raising rates, which eventually leads to higher yields for bond investors.
Can I lose money in a bond ETF?
Yes, you absolutely can. People often get this wrong. A bond ETF is not a savings account. Its share price moves every day, mainly due to changes in interest rates. Just look at the losses during the 2022-2023 rate hikes. The biggest danger here isn't default risk, which is very low. It's interest rate risk.
Which of these is best for a retiree seeking income?
Any of the three would be an excellent choice. They all deliver a steady, low-cost stream of monthly income. The best choice often comes down to convenience and cost. If you're a Vanguard client, BND is easy. At Schwab, you can trade SCHZ for free and enjoy its tiny fee advantage. In the end, the income you receive will be nearly identical from all three.
How do these ETFs fit into a broader portfolio strategy?
Think of these as the anchor for your portfolio. They are the core bond holding in a classic 60/40 stock/bond mix. Their job is to be the ballast. They provide stability and income to offset your stocks' wilder swings. When the stock market drops, these high-quality bonds act as a cushion. This helps you stay invested or even rebalance by buying more stocks on the cheap.
Should I consider a bond ladder strategy instead of an ETF?
This is a great question that gets to the heart of portfolio design. A bond ladder strategy means buying individual bonds that mature at different times (say, in 1, 2, 3, 4, and 5 years). As each bond matures, you get your money back and can reinvest it.
- Pros of a Ladder: You know exactly when you'll get your principal back (unless the issuer defaults). This erases interest rate risk if you hold the bond to the end.
- Cons of a Ladder: Building a diversified ladder takes more money and more work. It's also harder to sell individual bonds quickly if you need the cash.
- ETF Advantage: An ETF gives you instant diversification for a low price. You can buy or sell it in a second. The catch? It never "matures," so your principal isn't guaranteed. For most people, the ETF's simplicity wins.
The Final Verdict: Which Bond ETF Should You Choose?
After digging into the data, the conclusion is clear. For 99% of investors, the choice between BND, AGG, and SCHZ is a distinction without a meaningful difference. All three are superb products from top-tier firms. They are far more alike than they are different.
Your choice should come down to practical matters. Don't waste time hunting for a performance edge that isn't there.
- For the Cost-Minimizer: SCHZ is the winner. Its 0.02% expense ratio is the lowest of the bunch. Over decades, that single basis point adds up.
- For the Vanguard Loyal: BND is the obvious choice. If your money is already at Vanguard, using their flagship bond ETF keeps things simple.
- For the iShares Fan: AGG is the original and one of the most traded ETFs in the world. If your brokerage offers commission-free trading for iShares funds, it’s a perfect fit.
The most important takeaway isn't which of these three to pick. It's understanding the vital role a core aggregate bond fund plays in a smart portfolio. The real work is deciding your personal allocation to bonds based on your goals, timeline, and risk tolerance. Choosing between BND, AGG, and SCHZ is the easy part.