All fund-level expense ratios reflect provider and Morningstar data as of December 31, 2025; industry averages reflect the Investment Company Institute’s 2025 data year. Expense ratios change—verify current figures on each fund’s prospectus before investing. This is educational information, not investment advice.
TL;DR — Quick Verdict
- Fidelity’s ZERO funds (FZROX, FNILX) charge a 0.00% expense ratio—the lowest available to retail investors—while Schwab’s SWPPX charges 0.02% and Vanguard’s VOO charges 0.03%. On core U.S. equity index funds, all three providers now cost pennies.
- The gap that actually matters isn’t Fidelity vs Vanguard—it’s index vs active. Index equity mutual funds averaged 0.05% asset-weighted in 2025; actively managed equity mutual funds averaged 0.40%, per the Investment Company Institute.
- On a $100,000 balance held 30 years at 8% growth, paying 0.40% instead of 0.03% costs roughly $77,000 in forgone compounding—not the $370 annual sticker difference.
- Fidelity ZERO’s 0.00% comes with one real catch: proprietary indexes that can’t transfer to another brokerage without selling first.
- For most long-term investors, any of the four core index funds compared here—0.00% to 0.03%—is a defensible choice. Prioritize brokerage fit and portability over the final basis point.
A single basis point—one hundredth of one percent—now separates the cheapest S&P 500 index funds from the four largest fund providers in America. That level of price compression would have been unimaginable a generation ago. In 1996, the average equity mutual fund investor paid 1.04% annually; by the 2025 data year that asset-weighted figure had fallen to 0.40%, according to the Investment Company Institute’s Trends in the Expenses and Fees of Funds. For index funds specifically, the number is now almost negligible: index equity mutual funds averaged 0.05% asset-weighted.
This guide compares real, verified expense ratios across Vanguard, Fidelity, Charles Schwab, and BlackRock’s iShares—not marketing claims. You’ll get a side-by-side data table of comparable core funds, the 30-year dollar cost of each fee level modeled explicitly, the one structural catch buried inside Fidelity’s headline 0.00%, and a decision framework for which provider fits which investor. Every figure is sourced to a fund prospectus or a named institution.
Core Index Fund Expense Ratios: The Head-to-Head Numbers
Start with the funds most investors actually buy: broad U.S. equity index funds tracking either the S&P 500 or the total stock market. These are the products where price competition has been fiercest, and the spread across providers is now measured in single basis points.
Sources: Fidelity, Schwab Asset Management, Vanguard, and BlackRock iShares fund prospectuses and provider pages, expense ratios as of December 31, 2025 (verify at fidelity.com, schwabassetmanagement.com, investor.vanguard.com, ishares.com).
Two facts jump out. First, Fidelity’s ZERO line is the only true 0.00% product—no other major provider matches it. Second, once you step past the ZERO funds, the entire field clusters between 0.015% and 0.04%. The difference between Schwab’s SWPPX at 0.02% and Vanguard’s VOO at 0.03% amounts to $10 per year on $100,000. That is a rounding error next to the choices that actually move outcomes, which we quantify next. If you’re still weighing the fund structure itself, the trade-offs in ETF vs mutual fund cost and tax efficiency matter more than this basis-point gap.
What the Provider Averages Actually Reveal
Individual flagship funds tell you where price competition is hottest. Firm-wide averages tell you how a provider treats its entire lineup—including the niche, sector, and international funds where quiet fee padding often hides.
Vanguard reports an average mutual fund and ETF expense ratio of 0.07% as of December 31, 2025, against an industry average of 0.44% (asset-weighted, excluding Vanguard), per Vanguard and Morningstar data. Broken down, its average mutual fund runs 0.08% and its average ETF just 0.04%. On a corporate asset-weighted basis across U.S. funds, Vanguard cites 0.06%. The firm reduced fees on 84 share classes across 53 funds effective February 2, 2026, a cut it estimates will save investors roughly $250 million through year-end—following a February 2025 reduction across 168 share classes projected to save more than $350 million.
Fidelity and Schwab compete on the same axis. Fidelity states it beats or matches Vanguard on expenses for all comparable stock and bond index funds across Vanguard share classes requiring under $5 million, based on prospectuses as of February 1, 2026. Schwab’s core index lineup—SWPPX at 0.02%, SWTSX at 0.03%—undercuts or matches its rivals fund-for-fund. The strategic takeaway: at the index-fund level, no provider holds a durable cost edge worth switching brokerages over. The moment your money leaves index funds, though, the math changes entirely—as the next section shows.
Index vs Active: Where the Real Cost Lives
Focusing on whether Fidelity’s 0.00% beats Vanguard’s 0.03% is optimizing the wrong variable. The consequential decision is index versus active management, and the fee gap there is roughly ten times larger.
According to the Investment Company Institute’s Trends in the Expenses and Fees of Funds (March 2026, 2025 data year), index equity mutual funds carried an asset-weighted average expense ratio of 0.05%, while actively managed equity mutual funds averaged 0.40% asset-weighted—and 1.10% on a simple average basis, meaning the typical active fund on the shelf costs more than 20 times a core index fund. Index equity ETFs sat at 0.14% asset-weighted, higher than index mutual funds because the ETF universe includes many narrow, specialized products.
Consider a $250,000 rollover. At 0.05% (index), the annual drag is $125. At 0.40% (active), it’s $1,000—an $875 yearly difference that recurs every year, compounding against you. Whether that active manager earns the premium is a separate question explored in index vs actively managed fund performance and fees, but the cost side is unambiguous. The fee is certain; the outperformance is not. For a fuller treatment of how these charges accumulate, see the long-term cost of investment fees.
How a 0.37% Difference Becomes $77,000: The 30-Year Model
Expense ratios feel trivial because they’re quoted annually and deducted invisibly—you never get a bill. Projecting them across a full investing lifetime exposes the real stakes.
Model a $100,000 lump sum, untouched for 30 years, growing at an 8% gross annual return. The expense ratio is subtracted from that return each year, so a 0.40% fee means the portfolio compounds at 7.60% instead of the near-full 7.97% earned by a 0.03% fund.
Modeled calculation by Real Cost Report using standard compound-growth formulas; 8% gross return assumption is illustrative, not a forecast. Fee tiers reflect ICI 2025 data-year averages and verified fund ratios (verify methodology at ici.org).
The headline: moving from a 0.03% index fund to a 0.40% active fund costs about $95,000 of the final balance on this single $100,000 stake. Against a 1.10% fund, the damage approaches $267,000—more than the entire ending value of a smaller starting balance. Meanwhile, the difference between 0.00% and 0.03% is roughly $8,000 over three decades: real, but a fraction of the index-versus-active gap. This is why disciplined asset allocation by age and the 3-fund portfolio built from low-cost index funds tends to outperform expensive stock-picking over long horizons. The compounding effect also explains why behavioral finance mistakes and their annual cost often dwarf fees for investors who trade reactively.
Fidelity ZERO vs Vanguard: Which Is Better for a Long-Term Core Holding?
Fidelity’s FZROX charges 0.00%; Vanguard’s VTSAX charges 0.04%. On a $100,000 balance that’s a $40 annual difference, and over 30 years the compounding gap is roughly $10,000 in Fidelity’s favor. So the cheaper fund wins automatically—right? Not quite.
Fidelity achieves 0.00% by tracking proprietary indexes it built specifically to avoid licensing fees from S&P Dow Jones or CRSP. That design choice creates a portability problem: ZERO funds cannot be transferred in-kind to another brokerage. If you ever leave Fidelity, you must sell first—potentially triggering capital gains tax in a taxable account. Vanguard’s VTSAX and its ETF twin VTI (0.03%) track the standard CRSP total-market index and move freely between brokerages.
Vanguard also holds a structural distinction: it is owned by its funds, which are owned by shareholders, aligning the firm’s incentives toward continued fee cuts. Its asset-weighted average has fallen from 0.68% in 1975 to 0.06% in 2025. Fidelity’s incentive is different—it offers 0.00% funds to attract assets it monetizes elsewhere, through cash balances and securities lending.
Verdict
For a tax-advantaged account (IRA or 401(k)) where you’ll stay at Fidelity, FZROX’s 0.00% is the marginally better core holding—the portability catch is irrelevant inside a retirement wrapper. For a taxable brokerage account, or if you value the freedom to move providers without a tax event, Vanguard’s VTSAX or VTI at 0.03%–0.04% is the safer long-term choice. The four-basis-point premium buys portability insurance that can be worth far more than $40 a year if your circumstances change.
What Most Investors Get Wrong About Expense Ratios
Fee awareness has risen sharply, but several costly misconceptions persist even among sophisticated investors.
Mistake 1: Chasing the last basis point
Switching from a 0.04% fund to a 0.00% fund saves $40 a year on $100,000. Investors who trigger capital gains, disrupt automatic contributions, or spend hours agonizing over this gap are optimizing a variable that barely moves the needle. The correct action: pick any core index fund under 0.10% and direct your energy toward savings rate and consistency instead.
Mistake 2: Reading the ratio without checking the index
Two S&P 500 funds at identical 0.03% ratios are genuine substitutes. A 0.03% “thematic” or leveraged fund is not comparable to a 0.03% broad-market fund—the underlying risk differs entirely. The consequence is a portfolio that looks cheap but behaves nothing like the market. Always confirm what the fund actually tracks before comparing price.
Mistake 3: Ignoring account-level and transaction costs
The expense ratio is not the only cost. Buying Schwab’s SWTSX inside a Vanguard account, or Vanguard’s VTSAX at Fidelity, can trigger transaction fees that dwarf any expense-ratio savings. The consequence is paying $50 in transaction fees to save $10 in annual expenses. The fix: hold each provider’s index funds within its own brokerage, or use commission-free ETFs like VOO, IVV, or SCHB that trade free almost everywhere.
Mistake 4: Forgetting that ETF ratios understate the total-market average
The 0.14% asset-weighted index equity ETF average from the ICI includes hundreds of niche products. The broad-market ETFs most investors hold—VOO, IVV, VTI—sit at 0.03%, well below that blended figure. Judging your specific fund by the category average overstates what you actually pay.
Which Provider Is Worth It for Your Situation?
There is no single winner—the right provider depends on how you invest and what you value beyond the expense ratio.
Choose Fidelity if you want the absolute lowest cost, invest primarily in tax-advantaged accounts, and don’t anticipate leaving the platform. FZROX and FNILX at 0.00% are unmatched, and Fidelity’s $1 minimums and fractional shares suit small, frequent contributions—ideal for the dollar-cost averaging vs lump sum investing approach many salaried savers use.
Choose Vanguard if you prioritize the investor-owned structure, want standard third-party indexes that transfer freely, and value a firm whose business model is built around continuously cutting fees. Its 0.03% core ETFs and 0.04% Admiral mutual funds are marginally pricier than Fidelity’s floor but maximally portable.
Choose Schwab if you want the lowest-cost S&P 500 mutual fund available with no minimum—SWPPX at 0.02%—alongside a full-service brokerage and strong customer support. Choose iShares/BlackRock if you’re building an ETF-only portfolio and want the deepest, most liquid fund lineup, with IVV at 0.03% as a core anchor. For investors adding international exposure, weigh the international diversification costs and benefits across each provider, since foreign funds carry wider fee spreads than domestic ones. Those building the fixed-income sleeve should compare each provider’s fixed income allocation and return trade-offs, where index bond mutual funds also averaged just 0.05% in 2025.
Frequently Asked Questions
Is a 0.00% expense ratio fund actually free?
The fund charges no direct management fee—Fidelity’s FZROX and FNILX genuinely cost 0.00%. Fidelity monetizes these assets indirectly through idle cash balances, securities lending, and cross-selling other products. There’s no hidden expense ratio, but the funds use proprietary indexes and cannot transfer to another brokerage without selling first, which may create a taxable event in a non-retirement account.
Why is Vanguard’s average 0.07% if its S&P 500 fund is only 0.03%?
The 0.07% is a firm-wide average across every Vanguard mutual fund and ETF as of December 31, 2025, including bond, international, and actively managed funds that cost more than the flagship index products. Its cheapest ETFs run 0.04% on average, and core funds like VOO sit at 0.03%. The industry average excluding Vanguard was 0.44%, per Vanguard and Morningstar.
Does a lower expense ratio guarantee better returns?
Not directly, but it removes a certain drag on returns. Two funds tracking the same index will differ in net return by roughly their fee gap. Across the broader market, the ICI’s 2025 data shows investors overwhelmingly concentrate assets in the lowest-cost quartile—81% of equity mutual fund assets sat in the cheapest quartile at year-end 2024—because lower costs reliably improve net outcomes over time.
Should I sell my current index fund to buy a cheaper one?
Rarely, if it’s held in a taxable account. Selling a fund with unrealized gains to save 0.01%–0.03% annually can trigger capital gains tax that overwhelms decades of fee savings. In a tax-advantaged IRA or 401(k), switching costs nothing, so consolidating into the cheapest available core fund makes sense. The rebalancing without triggering taxes framework applies to this decision directly.
How We Researched This Article
Every expense ratio in this comparison was verified against a primary source before publication—provider fund pages, prospectuses, or fact sheets—rather than relying on aggregators or prior-year data. Fund-level ratios for Vanguard (VOO, VTSAX, VTI), Fidelity (FZROX, FNILX, FXAIX), Schwab (SWPPX, SWTSX), and BlackRock iShares (IVV) were confirmed against each provider’s official disclosures as of December 31, 2025. Where providers publish firm-wide averages, we cite the exact figure and its stated calculation method, noting that Vanguard’s averages are asset-weighted and exclude Vanguard from the industry comparison.
Industry-wide averages—the 0.05% index equity mutual fund figure, the 0.40% and 1.10% active equity averages, and the 0.14% index equity ETF figure—come from the Investment Company Institute’s Trends in the Expenses and Fees of Funds report (Research Perspective, March 2026, reflecting the 2025 data year), which sources its data jointly from ICI and Morningstar. Historical context on Vanguard’s fee trajectory draws from Vanguard’s corporate disclosures. Fund cost transparency and structural details were cross-checked against Fidelity and Schwab Asset Management.
The 30-year cost projections are modeled, not measured. They apply standard compound-growth formulas to an illustrative 8% gross annual return with fees deducted yearly; actual returns vary and are not forecast here. The dollar figures isolate the effect of expense ratios alone, holding all else constant, to make the fee differential visible. Limitations: real portfolios face taxes, trading costs, contribution timing, and market volatility that this model excludes, and provider fee cuts occurring after December 31, 2025 may alter the current figures. Research last conducted July 2026. All figures were verified against named primary sources before publication.