FZROX vs VTI: Which Should You Pick?
FZROX or VTI? A 0.00% Fidelity fund vs the 0.03% CRSP ETF. Why account type, index breadth, and portability matter more than three basis points, with a calculator.
FZROX charges 0.00% and VTI charges 0.03%, so the headline says FZROX wins. The fee is the least interesting difference between them. FZROX is a Fidelity-only mutual fund tracking Fidelity’s own proprietary index; VTI is a portable ETF tracking the CRSP US Total Market Index. Which one is the better default depends far more on what account you hold it in than on three basis points.
Quick answer
In a Fidelity tax-advantaged account (IRA, 401k), FZROX’s 0.00% fee is genuinely attractive and there is no tax cost to holding it. In a taxable account, VTI is usually the cleaner pick despite the 0.03% fee: it tracks the more complete CRSP index, it moves in-kind to any brokerage, and its ETF structure sheds capital-gains distributions. FZROX cannot leave Fidelity, so if you ever switch brokers you are forced to sell and realize gains. The 0.03% gap is about $30 a year per $100k; index breadth, taxes, and portability usually matter more than that.
| FZROX | VTI | |
|---|---|---|
| Wrapper | Mutual fund | ETF |
| Expense ratio | 0.00% | 0.03% |
| Index | Fidelity U.S. Total Investable Market (proprietary) | CRSP US Total Market |
| Holdings | ~2,688 | 3,507 |
| Market coverage | Starts from top ~3,000 U.S. companies | Designed to cover ~100% of the investable market |
| Portability | Fidelity-only; not transferable in-kind | Any brokerage; transfers in-kind |
| Taxable-account efficiency | Mutual fund; can distribute capital gains | ETF in-kind redemptions limit cap-gains distributions |
| Minimum | $0 | Price of one share |
Fidelity and Vanguard fund documents. Expense ratios and holdings as of early 2026.
The holdings gap is real but narrower in effect than it looks. The names FZROX omits are mostly micro-caps with a tiny aggregate weight, so the realized return difference between the two funds has historically been modest and has gone in both directions. The point is that the expense ratio alone does not capture index breadth, tax treatment, or the cost of being locked to one broker.
Fee savings vs benchmark difference
This tool contrasts the 0.03% fee gap with a small benchmark return difference over time. Even a 10 basis point annual gap between the two indices compounds to more than the fee savings, which is why the wrapper and index matter more than the headline number.
Fee Savings vs. Benchmark Dispersion
Fee savings over 25 years
$5,422
Benchmark impact
$-17.9K
Net difference
$-12.5K
The 3bp fee savings is worth $5,422. But a 10bp benchmark gap costs $17.9K. The benchmark choice matters 3.3x more than the fee.
The fee savings of 3bps would be offset by a benchmark return gap of just 3bps per year.
See your portfolio's actual factor exposures in Summitward's portfolio analysis
Who should pick which
Pick FZROX if you
- Hold it in a Fidelity IRA or 401k where portability is moot.
- Are investing small amounts and want no minimum.
- Plan to stay at Fidelity and want the 0.00% fee.
Pick VTI if you
- Are investing in a taxable account.
- Want a fund you can move to any brokerage in-kind.
- Prefer the broader CRSP index and ETF tax efficiency.
The full reasoning
For the evidence behind why benchmark design and portability outweigh a near-zero fee, read Zero Fee, Non-Zero Benchmark Risk: Why Fidelity’s ZERO Funds Optimize the Wrong Variable. See also FZROX vs VTSAX and VTI vs VTSAX.
Want to see how this fits your whole portfolio?
Summitward turns portfolio, tax, and life-planning tradeoffs into decisions you can act on, including overlap, concentration, and tax-location analysis across your accounts.