VOO vs SPY 2026: Which S&P 500 ETF Should You Buy?

Short answer: VOO and SPY track the exact same index — the S&P 500 — so their returns are nearly identical before costs. VOO is the cheaper long-term holding (0.03% vs 0.0945% expense ratio). SPY is the better trading vehicle, with the deepest share volume and the most liquid options market of any ETF on earth. Which one you should buy depends entirely on whether you are investing or trading.

VOO vs SPY at a glance

Metric	VOO (Vanguard S&P 500 ETF)	SPY (SPDR S&P 500 ETF Trust)
Issuer	Vanguard	State Street Global Advisors
Launched	2010	1993 (first US-listed ETF)
Index tracked	S&P 500	S&P 500
Expense ratio	0.03%	0.0945%
Legal structure	Open-end fund (1940 Act)	Unit Investment Trust (UIT)
Dividend handling	Can be reinvested internally	Held in cash until quarterly payout
Securities lending	Permitted	Not permitted (UIT rules)
Typical daily volume	High	Highest of any ETF globally
Options market	Liquid	Deepest listed options chain in the world
Best suited for	Buy-and-hold, retirement accounts	Active traders, hedgers, options strategies

The fee gap is small — until it isn't

VOO charges 0.03% a year; SPY charges 0.0945%. That is a difference of roughly 6.5 basis points, or about $6.45 a year on a $10,000 position. Trivial on its own — but the gap is a fixed annual drag that compounds against you.

On a $250,000 position held for 25 years at an assumed 8% annual return, the fee difference alone works out to several thousand dollars of forgone value. That is why almost every long-horizon allocation guide defaults to VOO (or its Vanguard mutual fund twin VFIAX) rather than SPY, despite SPY's longer history and larger brand recognition.

The counter-argument matters too: for a trader who holds for days rather than decades, the expense ratio is irrelevant. What matters is the bid/ask spread and the cost of getting size in and out — and there SPY wins outright.

Performance: why VOO usually edges SPY

Both funds replicate the S&P 500 by full physical replication, so gross returns are effectively identical. The small persistent gap in favour of VOO comes from three structural sources:

• Lower expense ratio. Roughly 6.5bp per year, mechanically.
• Dividend drag at SPY. Because SPY is a Unit Investment Trust, it must hold incoming dividends in cash until the quarterly distribution date rather than reinvesting them immediately. In rising markets this creates a small "cash drag" — the money sits idle instead of compounding in the index.
• Securities lending. VOO's open-end structure allows it to lend out portfolio securities and return the revenue to shareholders. SPY's UIT structure does not permit this.

Add these up and VOO's long-run tracking difference versus the index has historically been a little tighter than SPY's. Over one year the difference is barely visible; over a decade it is measurable.

Where SPY is genuinely better

SPY is not a legacy product that survives on inertia. It remains the single most traded equity security in the world, and that liquidity is a real, quantifiable advantage:

• Tightest spreads at size. A retail investor buying 20 shares will not notice. An institution moving eight figures absolutely will.
• Options depth. SPY has the deepest, tightest options chain of any ETF, with weekly and daily expiries. If your strategy involves covered calls, protective puts, spreads, or any hedging overlay, SPY is the default.
• Securities lending availability for shorts. SPY is the standard short-side hedging instrument on the equity desk.
• Futures and index alignment. SPY trades in tight arbitrage relationship with E-mini S&P 500 futures, making it the cleanest cash-market leg for basis trades.

If you are trading the index rather than owning it, spread and options liquidity swamp a 6.5bp annual fee. Traders who prefer leveraged exposure to the index typically use index CFDs or futures instead — see our indices signals hub for how the major index levels are being traded right now.

Tax treatment and dividends

Both funds are US-domiciled, distribute dividends quarterly, and are taxed identically at the investor level in a taxable US account: qualified dividends at long-term rates, and capital gains only when you sell. Neither has made a meaningful capital gains distribution in recent history, thanks to the in-kind creation/redemption mechanism that makes ETFs structurally tax-efficient versus mutual funds.

The one structural difference is the SPY cash-drag point above — it is a return issue, not a tax issue. Non-US investors should note that both funds are subject to US withholding tax on dividends and both fall inside the US estate-tax net; that is usually the argument for using a UCITS S&P 500 ETF instead, not for choosing between VOO and SPY.

Which one should you actually buy?

Buy VOO if…

• You are dollar-cost averaging into a retirement or brokerage account.
• Your holding period is measured in years, not days.
• You want the lowest possible ongoing cost and are not trading options on the position.

Buy SPY if…

• You trade the index actively, intraday or over days.
• You write options, run spreads, or hedge with puts.
• You need to move large size with minimal market impact.

A large number of investors sensibly own both: VOO as the core long-term holding, SPY as the tactical or hedging sleeve. There is no rule against it, and because they track the same index, holding both does not meaningfully change your equity exposure profile.

The alternatives worth knowing

• IVV (iShares Core S&P 500) — 0.03%, open-end structure, essentially interchangeable with VOO. Choose on whichever is commission-free at your broker.
• SPLG (SPDR Portfolio S&P 500) — State Street's low-cost answer to VOO at 0.02%, with a lower share price that suits small, frequent contributions.
• VTI (Vanguard Total Stock Market) — not an S&P 500 fund; adds mid- and small-caps for broader US coverage.

Whichever wrapper you choose, remember that you are buying an index dominated by a handful of megacap technology names. The concentration risk is real: read our NVIDIA stock forecast for 2026 to understand how much of the index's direction now depends on a single AI capex cycle, and our market impact analysis of the Iran–Israel ceasefire for how geopolitical shocks feed through to US equities.

How to analyse the S&P 500 before you buy

Neither ETF protects you from buying at a bad level. Before committing capital, check where the index sits against its moving averages and momentum indicators — our free technical analysis tool gives a live read on the S&P 500 and its components, and the wider markets toolkit covers the economic calendar and earnings dates that tend to move the index most.

If you would rather trade the index than hold an ETF, you can open a broker account with access to index CFDs, cash equities and ETFs from a single platform.

Bottom line

VOO and SPY are the same bet on the same 500 companies. VOO wins on cost and structural efficiency, which is what matters over a multi-decade holding period. SPY wins on liquidity and options depth, which is what matters if you are trading. Pick the one that matches your holding period — and do not lose sleep over the difference, because the index itself will drive well over 99% of your outcome either way.

For the wider picture across every fund category, see our guide to the best ETFs of 2026.