Two of the most popular total U.S. stock market funds look almost identical on paper. Fidelity's FZROX charges a 0.00% expense ratio. Vanguard's VTI charges 0.03%. Both hold thousands of stocks across the entire U.S. market. So which one should you actually buy? The answer comes down to your brokerage, your account type, and how much you care about being able to move money between platforms. Here is the FZROX vs VTI breakdown without the fluff.
What Are FZROX and VTI?
FZROX is the Fidelity ZERO Total Market Index Fund. It is a mutual fund launched in 2018 that holds about 2,600 U.S. stocks. The headline feature is the 0.00% expense ratio, meaning Fidelity charges nothing to run it.
VTI is the Vanguard Total Stock Market ETF. It is an exchange-traded fund holding around 3,700 U.S. stocks. As of May 2026, the expense ratio is 0.03%. VTI has been around since 2001 and is one of the most widely held funds in the world.
Both funds aim to track the entire U.S. market: large-cap, mid-cap, small-cap, and micro-cap stocks. Like other index funds, the differences hide in the structure and the fine print.
To get started with either, most investors use a commission-free brokerage like Robinhood, which lets you buy stocks, ETFs, and options with no minimums and no commissions.
Robinhood
Robinhood
Robinhood is a trading platform that brings stocks, ETFs, options, futures, prediction markets, crypto, and retirement accounts together in one app.
Standout feature
One platform for stocks, ETFs, options, futures, prediction markets, and crypto
Fees
$0 commission on stocks, ETFs, and options.
Pros
Zero-commission trading on stocks, ETFs, and options
Cons
Best perks (high APY, lower margin rates) require Gold subscription ($5/month)
Expense Ratio: Zero Versus Almost Zero
FZROX wins on paper. 0.00% versus 0.03% sounds like a clear victory. On a $10,000 investment, that is a savings of $3 a year. Over 30 years on a growing balance, it might add up to a few hundred dollars.
But expense ratio is not the whole cost story. Tax efficiency, dividend reinvestment, and trading flexibility matter just as much for many investors. We will get to those.
Holdings and Diversification
VTI tracks the CRSP US Total Market Index and holds roughly 3,700 stocks. FZROX tracks a proprietary Fidelity index and holds about 2,600 stocks.
Both funds capture the vast majority of the U.S. market by weight. The big winners, Apple, Microsoft, Nvidia, dominate either fund. The differences show up in micro-caps, where VTI casts a wider net. For broader context on how these compare to S&P 500 index fund options, total market funds reach further down the cap spectrum.
In practice, performance between the two has tracked very closely. Differences in annual returns usually come in under 0.10%.
ETF Versus Mutual Fund Structure
This is the most important difference. VTI is an ETF. FZROX is a mutual fund. The ETF vs mutual fund distinction is the heart of the comparison.
ETFs trade throughout the day like stocks. You see a live price, you can use limit orders, and you can buy or sell anytime the market is open. Mutual funds trade once a day at the closing price.
ETFs are also more tax efficient. The way ETF shares are created and redeemed means VTI almost never passes capital gains to shareholders. FZROX, as a mutual fund, can distribute capital gains in taxable years, which creates a tax bill even if you do not sell.
For a Roth IRA or 401(k), this does not matter. For a regular taxable brokerage account, VTI has a real edge.
Portability: The FZROX Catch
FZROX is a Fidelity-only fund. You can only buy it at Fidelity. If you decide to leave Fidelity and move your account elsewhere, you cannot transfer FZROX shares as-is. You have to sell, which creates a taxable event in a brokerage account, then rebuy something similar at the new broker.
VTI works anywhere. Fidelity, Schwab, Vanguard, Robinhood, Merrill, and most other brokerages all let you buy, hold, and transfer it freely. If you ever want to switch platforms, you can move VTI without selling.
This matters more than people think. Locking your money to one broker limits your options if their service, fees, or features change.
Minimum Investment and Fractional Shares
FZROX has no minimum investment. You can start with $1 at Fidelity, and the fund supports automatic recurring purchases of any dollar amount.
VTI's minimum is the price of one share, around $290 as of May 2026. Most brokerages now offer fractional shares of ETFs, so you can buy $5 or $50 worth without owning a full share. If your broker does not support fractional ETF shares, that is a point for FZROX.
Tax Efficiency in a Taxable Account
ETFs like VTI rarely distribute capital gains. The fund's structure lets managers move shares around without selling underlying stocks at a profit. That keeps your tax bill smaller until you actually sell.
FZROX has distributed small capital gains in the past, including a 0.30% to 0.50% distribution in some years. In a taxable account, that gets taxed even if you reinvest.
If you are investing inside a Roth IRA, traditional IRA, or 401(k), this difference disappears. A brokerage vs retirement account decision matters here because tax-advantaged accounts shield both funds equally.
Dividends
Both funds pay dividends quarterly. The yields hover around 1.2% to 1.5% depending on the year. You can reinvest dividends automatically in either fund. The cash hits your account the same way regardless of which one you own.
Building Credit While You Invest
Investing for the long term works best when your day-to-day finances are stable. That means a healthy credit score, an emergency fund, and no high-interest debt eating into your contributions.
Many Firstcard users invest $50 to $100 a month while also building credit with a starter card. Pairing an ETF deposit with a product like the Self Visa Credit Card, OpenSky, or the Kikoff Secured Credit Card helps you build credit history while your portfolio grows. None of these products require great credit to start, and they all report to the major bureaus.
If you do not have a Social Security number yet, the Current Build Card is a common entry point.
When to Pick FZROX
FZROX is the better choice if:
- You already use Fidelity and plan to stay long-term.
- Your investments live inside a Roth IRA, traditional IRA, or 401(k), so tax efficiency does not matter.
- You want a true 0.00% expense ratio with no minimum investment.
- You like the simplicity of mutual fund automatic investing in any dollar amount.
When to Pick VTI
VTI is the better choice if:
- You invest in a taxable brokerage account where tax efficiency matters.
- You want the option to move your account to a different broker someday.
- You like trading flexibility with intraday pricing and limit orders. Knowing how to buy stocks with limit orders helps you get a fair fill on VTI.
- You want the slightly broader exposure of 3,700 stocks instead of 2,600.
Which One Actually Wins?
For a long-term investor inside a Roth IRA at Fidelity, FZROX wins on cost and convenience. For a long-term investor in a taxable account or someone who wants flexibility across brokerages, VTI wins on portability and tax treatment.
The difference in real-world performance over 10 to 20 years is small. The bigger decision is just to start investing consistently. Past performance does not guarantee future returns, and any investment carries risk.
Next Steps
Pick the broker you want to use first. If it is Fidelity and the money is going into a retirement account, FZROX is the cleaner option. If you want flexibility or you invest in a taxable account, VTI is the safer long-term pick. Either way, set up automatic monthly deposits so you keep investing regardless of what the market does.
Frequently Asked Questions
Can I buy FZROX outside of Fidelity?
No. FZROX is a Fidelity proprietary fund and is only available through a Fidelity brokerage account. If you use Schwab, Vanguard, Robinhood, or another broker, you cannot buy it. VTI is the closest alternative available almost everywhere.
Is FZROX really free?
FZROX has a 0.00% expense ratio, which is the management fee. There may still be small operational costs that show up as minor tracking differences versus the index. There are no commissions or transaction fees to buy or sell it at Fidelity.
Which has better long-term returns, FZROX or VTI?
Returns have been very close, usually within 0.10% per year. VTI holds more small-cap stocks, which can pull returns slightly higher or lower depending on the year. Over 5 to 10 years, the difference is small enough that other factors like tax efficiency and portability matter more than chasing a slightly higher return.
Should I own both FZROX and VTI?
It is not necessary. They cover the same U.S. market, so holding both creates overlap without real diversification benefits. Most investors pick one based on their account type and broker, then keep it simple.
