Wealthy PotVFIAX vs VTSAX: Identical Fee, Different Share of the Market
VFIAX and VTSAX are the two funds most often held at the centre of a Vanguard portfolio, and choosing between them is simpler than it looks. Both charge 0.04%. Both require $3,000 to start. Cost and access are a tie, so the decision rests entirely on whether you want the S&P 500 or the whole U.S. stock market.
The Short Answer
- Want one fund to be your whole U.S. stock allocation? VTSAX. Total market means you never have to separately decide about mid-caps and small-caps.
- Want the classic large-cap benchmark, or already own separate small- and mid-cap funds? VFIAX. The S&P 500 is the standard large-cap building block.
- Do not have $3,000 yet? Buy the ETF version instead. VOO and VTI hold the same portfolios with no minimum beyond one share.
VFIAX vs VTSAX Side by Side
| Feature | VFIAX | VTSAX |
|---|---|---|
| Full name | Vanguard 500 Index Fund Admiral Shares | Vanguard Morningstar Total Stock Market Index Fund Admiral Shares |
| What it owns | The S&P 500, large-cap U.S. companies | The total U.S. stock market: large, mid and small caps |
| Expense ratio | 0.04% | 0.04% |
| Minimum | $3,000 | $3,000 |
| ETF equivalent | VOO | VTI |
| Wrapper | Mutual fund | Mutual fund |
One detail worth noticing in that table: VTSAX's official name now reads Vanguard Morningstar Total Stock Market Index Fund. Vanguard has moved the fund's benchmark to the Morningstar US Total Market Index. For a broad total-market fund this is a technical change rather than a strategic one, the fund still aims to hold the entire U.S. market, but if you are comparing older articles that call it a CRSP-tracking fund, that is why the descriptions differ.
The Fee Is a Tie
Both funds report an expense ratio of 0.04%. On a $100,000 balance that is $40 a year in either fund. There is no cost advantage to either side, and any comparison that picks a winner on price is inventing a difference that does not exist.
It is worth noting how low that is in absolute terms. A fund charging 1%, which was once ordinary for actively managed products, would take $1,000 a year on the same balance. The gap between these two Vanguard funds is zero; the gap between either of them and a typical active fund is enormous. That is the comparison that actually moves money.
The $3,000 Minimum, and How to Skip It
Both Admiral share classes require $3,000 to open a position. That is the single most common obstacle for someone starting out, and there is a straightforward way around it.
Vanguard runs ETF versions of both portfolios: VOO mirrors VFIAX, and VTI mirrors VTSAX. The ETFs hold the same underlying investments and have no minimum beyond the price of one share. If you are building up to $3,000, buying the ETF is not a compromise, it is the same exposure in a different wrapper, and many investors simply stay in the ETF permanently.
The mutual fund does retain one practical advantage: you can buy it in exact dollar amounts, which makes automatic recurring contributions tidier. If you want to invest precisely $500 every month without leftover cash, the mutual fund handles that more cleanly than an ETF does at some brokers.
What VTSAX Adds
VTSAX holds everything VFIAX holds, plus several thousand mid-cap and small-cap companies. By count of holdings that is a large addition. By share of the fund's money it is a modest one, because both funds weight companies by market value and the S&P 500 already accounts for the large majority of U.S. market value.
So the honest description is this: VTSAX gives you completeness and removes a decision. It does not give you a materially different risk profile, and it does not give you meaningful small-cap tilt. If you specifically want small companies to matter in your portfolio, a total-market fund will not deliver that on its own, you would need a dedicated small-cap holding.
When Not to Switch
If you already hold one of these in a taxable account at a gain, switching to the other realises a capital gain and creates a tax bill. You would be paying real money to move between two funds with the same fee that behave very similarly. That is almost never worth doing.
Inside an IRA there is no tax cost to exchanging between them, so if you have a genuine preference you can act on it freely.
There is one Vanguard-specific move worth knowing: Vanguard has historically allowed a tax-free conversion from a mutual fund share class to its ETF equivalent, VTSAX to VTI, for instance. That is a share-class change rather than a sale. It does not work in reverse, and the details are worth confirming with Vanguard before relying on it.
Which One Fits You
Pick VTSAX if you want a single fund to cover U.S. stocks completely and would rather not manage separate pieces. It is the more common choice among investors who favour simplicity.
Pick VFIAX if you prefer the best-known U.S. benchmark, if you are assembling a portfolio from deliberate large-, mid- and small-cap components, or if your plan offers it and not the total-market option.
Either way, the fee is the same and the outcomes will be close. Contribution rate and time in the market will decide your result far more than this choice will.
FAQ
Is VTSAX or VFIAX cheaper?
Neither. Both charge 0.04%, which is $40 a year on $100,000.
Does VTSAX include the S&P 500?
Yes. VTSAX covers the entire U.S. market, which contains all of the S&P 500 companies plus thousands of smaller ones. Holding both is largely duplicate exposure.
What if I do not have $3,000?
Buy VOO instead of VFIAX, or VTI instead of VTSAX. They are the ETF versions of the same portfolios and have no minimum beyond one share.
Why does VTSAX now say "Morningstar" in its name?
Vanguard moved the fund's benchmark to a Morningstar total-market index. The fund's objective, track the whole U.S. stock market, is unchanged.
Should I hold both?
Generally no. They overlap almost entirely, so holding both mainly tilts you further toward large caps rather than diversifying you.
This article is for general information and is not investment advice. Fund figures were taken from Vanguard's published fund pages on 2026-09-21 and can change; confirm current figures before you invest.