FILE / VTI-VTSAX
2026 edition
VANGUARD TOTAL MARKET PAIR
VTI vs VTSAX: total US market in two wrappers
Both track the CRSP US Total Market Index, holding roughly 3,600 stocks across large, mid, and small caps. The Bogleheads' default fund, available as ETF or mutual fund.
LIVE SEC DATA / FIG. 0
From the most recent N-CSR filings on SEC EDGAR
Both funds are registered investment companies under the Investment Company Act of 1940 (15 U.S.C. §§ 80a-1 et seq.) and elect RIC status under 26 U.S.C. § 851. The ETF operates under SEC Rule 6c-11 (17 CFR 270.6c-11), authorising in-kind creation and redemption under 26 U.S.C. § 852(b)(6). The mutual fund prices daily at NAV under Investment Company Act § 22(d) (15 U.S.C. § 80a-22(d)).
Cross-verify any figure on SEC EDGAR by entering each fund's CIK; see the methodology page for refresh cadence and the full source ledger.
QUICK VERDICT
read this if nothing elsePick the ETF if
You want broker-agnostic exposure, are starting under $3,000, prefer intraday pricing, or hold in a taxable account at a broker outside the home brokerage.
Pick the index fund if
You are at the home brokerage, have at least $3,000, and want effortless automatic monthly investing into a single fund.
Like VOO and VFIAX, this is the same portfolio in two wrappers. The CRSP US Total Market Index spans nearly the entire investable US equity universe. Expected long-run returns are slightly higher than the S&P 500 historically because of small and mid-cap exposure, with slightly more volatility.
FIG. A / SPEC SHEET
Side by side
FIG. B / TOTAL MARKET VS S&P 500
Why pick total market over S&P 500
The S&P 500 captures roughly 80% of US equity market cap by holding the 500 largest companies. The CRSP US Total Market Index used by VTI and VTSAX captures the rest by including thousands of mid and small caps. Long-run returns have been very close, often within tenths of a percentage point per year. The total market argument is intellectual consistency: own the whole market, not a subjective subset of it.
Coverage
The extra ~3,100 stocks in total market funds add diversification at the small and mid-cap end of the market. Their weight by market cap is modest.
FIG. C / WHY VTSAX BECAME THE BOGLEHEADS' DEFAULT
Total market in one ticker, run by the firm that invented index funds
John Bogle, the issuer's founder, advocated for owning the entire US market through a single broad index fund. VTSAX (and its predecessors) became the literal embodiment of that philosophy, captured in the Bogleheads three-fund portfolio. The mutual fund wrapper made it easy for an entire generation of retirement savers to set up a recurring monthly contribution and stop thinking about it. VTI is the same portfolio for the post-2010 generation that prefers ETFs.
DESK Q&A
Frequently asked
Q01Is VTSAX the same as VTI?
Same underlying portfolio, different share class. VTSAX is the mutual fund wrapper, VTI is the ETF wrapper. Both hold the same ~3,600 stocks at the same weights. Pick based on whether you want intraday trading and a low minimum (VTI) or one-click auto-invest and exact dollar amounts (VTSAX).
Q02Should I pick total market or S&P 500?
Either is fine. Long-run returns have been close. The total market argument is theoretical purity (own the whole market, do not pick a subset). The S&P 500 argument is that large caps drive the bulk of returns and the simpler index has a longer track record. The differences are second-order to your savings rate and asset allocation.
Q03Can I convert VTSAX to VTI tax-free?
Yes, in a taxable account at the home brokerage. The issuer supports a one-way share-class conversion from VTSAX to VTI without realising capital gains. The reverse is not supported. Some investors start with VTSAX for the auto-invest convenience and convert to VTI later if they want ETF wrappers in a taxable account.
Q04Is VTSAX tax-efficient enough to hold in a taxable account?
Yes. The shared-portfolio structure has historically given VTSAX low capital-gains distributions, on par with VTI. At other issuers, total market mutual funds are typically less tax-efficient than the ETF wrapper. If you are at a brokerage outside the home platform and you are taxable, lean ETF.
DESK ROUTING