How to evaluate ETFs: 6 things that matter most

• Start with your investment goals and ETF strategy to help you understand each fund’s objective, benchmark, and level of concentration.
• Evaluate performance, fees, and liquidity carefully—these factors can significantly impact long-term returns.
• Make sure the ETF fits your portfolio and risk profile because diversification, tax implications, and goal alignment matter more than short-term performance.

Have you ever stood in the cereal aisle, rows of colorful boxes before you, paralyzed by indecision? Some promise “ancient grains.” A few scream, “protein!” And others declare themselves to be “superfood clusters”—whatever that is. Which one should you pick? You won’t find the answer analyzing the packaging. You need to read the nutrition label—yes, the one written in teeny, tiny print.

With more than 4,900 ETFs trading in the US alone,¹ choosing what to invest in can make your head spin—in true cereal aisle fashion.

Fortunately, you don't need a finance degree or 20-20 vision to evaluate ETFs. You just need to know what to look for. Consider this your ETF nutrition label decoder.

6 steps to choosing the right ETF for your goals

Smart investors use a few simple tricks to cut through the marketing noise and focus on what actually matters.

1. Determine your investment objective and strategy
2. Stress test the ETF issuer
3. Evaluate performance and tracking error
4. Know the costs
5. Check liquidity
6. Consider how the ETF fits into your portfolio

Step 1: Determine your investment objective and strategy

Before you compare tickers, let’s start with the big question: What do you want this ETF to do?

Every ETF is built with a specific goal in mind. Some aim to mirror well-known indexes like the S&P 500®. Others focus narrowly on sectors (e.g., Technology, Energy) or themes (e.g., artificial intelligence, clean energy). At the end of the day, you want to make sure it matches your investment strategy—before you actually invest.

Start with your role for the investment:

• Core long-term growth?
• Income?
• Diversification?
• A tactical or short-term idea?

Once the ETF’s role is clear, dig into the strategy by asking yourself:

Looking for a good place to find this information? You’ll find these details (and more) in the fund’s prospectus or on the fund’s respective webpage—think of these resources as an ETF’s nutrition label.

Step 2: Stress test the ETF issuer

You’ve determined your investment strategy. Great! But before you start comparing tickers or dive into specific product details, it’s critical to take a step back and look at who’s behind the fund. Not all ETF issuers are built the same—and their strengths matter.

Every issuer has a reputation and specific areas of expertise. Some are known for low-cost index tracking. Others focus on active management, factor strategies, or niche areas like leveraged, thematic, or alternative exposures.

Once you know the ETF strategy you want to add to your portfolio, make sure the issuer has a strong track record in that lane.

If you’re shopping for a heart-healthy, high-fiber cereal, a brightly colored box of sugary loops probably isn’t the right fit. In other words, the brand tells you a lot about what you’re actually getting.

When stress testing an ETF issuer, here are some questions you can ask yourself:  

And if you’re the type who brings a magnifying glass to the nutrition label, you can also research:

• How long the issuer has been in the ETF business
• What they specialize in
• The size of their ETF platform
• Whether their funds track benchmarks closely
• How often they close funds

Choosing the right issuer won’t guarantee strong returns. But it can increase the odds that your ETF does what it’s supposed to do—efficiently, consistently, and without surprises.

Step 3: Evaluate performance and tracking error

Returns are usually the first thing people check, and for good reason. It’s kind of like reading up on product reviews before making a purchase. You want to see how the ETF has performed over time. But to really understand the fund, you need to dig a little deeper.

If an index ETF shows eye-popping return compared to its benchmark, that’s not always a good sign. It could indicate significant tracking error—or in other words, when a fund drifts from the index it’s supposed to follow.

For actively managed ETFs, strong outperformance isn’t an automatic win. It may mean the manager is taking on additional risk to generate those returns—and the key question is whether you’re being adequately compensated for that extra risk.

When comparing active ETFs, look beyond returns alone and consider basic risk-adjusted return measures, such as:

• Volatility (standard deviation): How much the fund’s returns move up and down
• Sharpe ratio: How much return the fund generated for each unit of risk
• Drawdowns: How much the fund has fallen during market downturns

High returns matter—but smoother, more efficient returns matter more.

But for passive index ETFs, tracking error usually stems from more mundane technical factors rather than the manager going off-script. Common causes of tracking error include:

• Fees: Running an ETF isn’t free. As a result, a small fee (known as the expense ratio) comes out of any ETF returns. When you see an ETF underperforming its index, it’s typically by the amount of its expense ratio.
• Cash drag: This occurs when the fund holds cash from dividends or inflows that haven’t been reinvested yet. Since cash doesn’t generate the same returns as other types of investments, it can drag the fund’s performance down.
• Transaction costs: Every time the fund rebalances when an index changes its constituents, it incurs trading fees and bid-ask spreads that eat into returns.
• Representative sampling: Some funds that track indexes with thousands of securities don’t buy every single stock. Instead, they invest in a representative sample, kind of like a movie trailer that captures the essence of a film without making you sit through the whole thing. This can lead to slight performance differences.

Some tracking error is perfectly normal and covers costs like fees. But the smaller and steadier the gap, the better. With index ETFs, the goal is consistency. You want it to closely mirror the benchmark, not beat it by swinging for the fences.

Remember, while past performance isn’t a guarantee of future results, it does show how an ETF tends to behave in different markets.

Step 4: Know the costs

ETFs are known for having lower costs than other mutual funds,² but you still should analyze each individual ETF’s costs.

The first number to check is the expense ratio, the annual fee that’s automatically taken out of your returns. Some ultra-low-cost broad-index ETFs charge as little as 0.02%, while specialized or actively managed ETFs may charge 0.5% to 1% or more.

That difference compounds over time. If you invest $10,000 and earn 7% annually for 30 years, a low-cost ETF could grow to about $75,000, charging just $505 in cumulative fees. An ETF charging 0.5%, by contrast, could leave you with $9,000 less—$5,053 in cumulative fees, as well as nearly $4,000 in missed compounding potential over the 30-year timeframe.

But expense ratios are only part of the story. Trading costs also matter; together with the expense ratio, they make up what’s known as a fund’s total cost of ownership (TCO). These costs can vary depending on how liquid the ETF is (more on that in Step 5), how often you trade, and even market conditions.

On top of that, some ETFs charge for management or operational expenses. These are usually small, but worth scanning for in the fund’s prospectus.

Step 5: Check liquidity

An ETF may look great on paper, but if it’s hard to trade, you could run into problems. How easy an ETF is to trade depends on its liquidity—or how easy it is to turn your ETF back into cash.

Think about it like concert tickets—it would be far easier to resell concert tickets to Taylor Swift (high demand, high liquidity) than some niche, atonal band (low liquidity). No disrespect to atonal aficionados.

So what impacts liquidity?

• Trading volume: ETFs with higher trading volume are typically easier to trade and tend to have tighter bid-ask spreads—the difference between what buyers want to pay (the bid) and what sellers will accept (the ask). A wide bid-ask spread is a hidden cost.
• Pricing efficiency: Well-functioning ETFs usually trade close to the value of their underlying holdings, known as the net asset value (NAV). While larger and more established funds often trade more frequently, fund size alone doesn’t determine liquidity. Market makers can create and redeem shares to help keep pricing efficient—even for newer or smaller ETFs—especially when the underlying holdings themselves are liquid.

As a quick check, look for ETFs that:

• Trade close to their NAV most of the time
• Have relatively tight bid-ask spreads
• Hold liquid underlying investments

Liquidity isn’t just about how big a fund is—it’s about how efficiently the ETF ecosystem supports trading.

Step 6: Consider how the ETF fits into your portfolio

The last step is looking at the ETF in context. Even if it checks all the above boxes, it still needs to make sense alongside your other investments.

Use these questions to guide you:

Ready to buy? Here are some ETF tips worth remembering

Smart investors use a few key strategies when selecting ETFs. Here’s what to keep in mind:

Choose ETFs with confidence

In an ETF market full of choice—much like a crowded cereal aisle—clarity comes from examining the details. Evaluating an ETF’s holdings, costs, and construction helps you focus on what really matters, not just what looks good on the shelf.