VOO vs VTI for Retirement: S&P 500 or Total Stock Market?

Neither is better in general: for retirement savers, the choice between VOO and VTI matters far less than owning one of them consistently and keeping costs low. They charge the same 0.03% a year, both are run by Vanguard, and their returns have moved almost in lockstep. The real difference is what sits outside the S&P 500: mid and small companies, which VTI includes and VOO leaves out.

Scope: this page compares the two ETFs as the US stock core of a retirement portfolio held by a US investor, in a 401(k), IRA or taxable account. It does not cover international stocks (see VT vs VTI and VXUS), bonds, or factor and dividend funds. It is education, not advice for your situation.

On cost, structure and recent results, the two funds are close to identical. Fund facts and trailing returns (NAV, Vanguard, Sep 30, 2026) are from Vanguard’s fact sheets; the distribution yield and the largest drop come from Exent market data (daily total return with distributions reinvested, to Sep 30, 2026).

The index name on VTI changed in 2026, not the fund. Morningstar bought CRSP, the CRSP US Total Market Index became the Morningstar US Total Market Index on Jul 28, 2026, and Vanguard renamed the fund “Vanguard Morningstar Total Stock Market ETF” the next day. Vanguard said the methodology and tickers stay the same (Vanguard press release). VTI’s fact sheet describes the index as about 100% of investable US companies. Assets differ in size mainly because Vanguard reports the whole fund, including mutual-fund share classes, alongside the ETF.

About 3,000 mid and small companies (3,519 stocks in VTI against 505 in VOO, Vanguard, Sep 30, 2026). The fund holdings dataset reports 89.1% weighted overlap between VOO and VTI as of October 20, 2026, so the extra companies are a small part of VTI. S&P Dow Jones Indices puts the S&P 500 at about 83% of total US market value (S&P DJI); the two figures are measured differently (index-provider estimate vs a fund-holdings snapshot), so treat both as approximate.

The large companies are the same at the top: Nvidia, Apple and Microsoft lead both funds. VOO is a little more concentrated (its top 10 are 40.6% of the fund against 36.1% in VTI, Vanguard, Sep 30, 2026), because the extra small companies dilute everyone else slightly. If concentration in a handful of giants worries you, VTI only softens it; see equal weight vs cap weight and RSP vs VOO for a fund that changes it, or QQQ vs VOO for one that concentrates further.

Over the last nine full years VOO came out ahead in eight, usually by less than one percentage point, and VTI fell slightly more in both selloffs shown. Calendar-year total returns and crash drops, from Exent market data (daily total return, distributions reinvested):

The nine annual returns have a correlation of 0.996 (Exent calculation on the returns above), which is about as close as two different indexes get. VOO launched in 2010, so it has no 2008 figure; VTI fell 55.5% from Oct 9, 2007 to Mar 9, 2009. The decade favored the largest companies, so VOO led. That is not a rule: in 2020 VTI was ahead by 2.7 points, and leadership between large and small companies has rotated in the past. Pick the fund for what it holds, not for which one won the last ten years.

Either fits any account, because both are low-turnover index ETFs that rarely pay capital-gain distributions. State Street found that only 6% of equity ETFs paid a capital gain in 2025, against 57% of equity mutual funds (State Street). A practical way to decide:

• 401(k): you can only buy what the plan offers, often an S&P 500 index fund. That is the same exposure as VOO, so in an IRA or taxable account you can add VTI or a small extended-market fund if you want the whole market.
• Roth or traditional IRA: no tax difference between the two. Pick one and automate contributions. See best ETFs for a Roth IRA.
• Taxable account: both are tax-efficient stock holdings; Vanguard’s research suggests putting taxable bonds in tax-advantaged accounts first and stock index funds in taxable (Vanguard). The cost to watch is switching, below.

Often more than any benefit, because the fee is the same and selling triggers tax on the gain. Federal rates from the IRS: long-term capital gains are taxed at 0%, 15% or 20% (IRS Topic 409), plus a 3.8% net investment income tax above $200,000 of modified adjusted gross income for single filers and $250,000 for joint filers (IRS Topic 559). Hypothetical tax assumptions: the entire $80,000 gain is taxed at 15%, and the entire gain is additionally subject to 3.8% NIIT. These assumptions produce $15,040 of federal tax; actual liability depends on the investor’s tax circumstances.

The hurdle: the required return satisfies (1 + rVTI) ÷ (1 + rVOO) = (200,000 ÷ 184,960)^(1/10) = 1.007848, every year for a decade. That is relative growth of about 0.785% a year; the percentage-point difference depends on VOO’s return. This simplified comparison excludes eventual liquidation taxes. Over the past ten years VTI did the opposite and trailed VOO by 0.59 points a year (14.70% vs 15.29%, NAV). Part of the tax is only brought forward if you would sell later anyway, but paying it now loses the growth on that money in the meantime.

If you hold VOO and want the whole market, a cheaper route is to direct new contributions to a fund that holds only the companies outside the S&P 500, such as Vanguard Extended Market ETF (VXF, 0.05%). An S&P 500 fund and an extended-market fund can provide complementary exposure, but their weights require a separately verified market-cap calculation. In an IRA or 401(k), switching has no tax cost.

Mostly, yes. With 89.1% weighted overlap between the two (Oct 20, 2026), holding both is close to holding more VOO plus a sliver of small companies. It adds a line to track with limited additional diversification. It makes sense only by accident of history, for example VOO in an old taxable account you do not want to sell and VTI for new money. If you are choosing among S&P 500 funds, see VOO vs IVV vs SPY vs SPYM. The full overlap numbers for VOO, VTI and QQQ are in how much VOO, QQQ and VTI overlap, and the wider problem in too many ETFs.

Several funds from other issuers do the same job at the same or similar cost; the differences are mostly the brokerage you use. Expense ratios and holdings from the issuers (holdings as of Sep 30–Oct 23, 2026):

When the bigger decision is still open. Counterexample: a 62-year-old with 95% of savings in US stocks gains nothing from swapping VOO for VTI; the 2022 drop was −18.2% in one and −19.5% in the other. What changes that retiree’s risk is how much sits in bonds and cash and how withdrawals are planned (see investing near retirement and BND vs AGG). The same goes for someone with no international stocks at all: that gap is far larger than the VOO-VTI one.