VOO and IVV are two of the largest exchange-traded funds in the world, and they do exactly the same thing: track the S&P 500 index. Choosing between them feels like comparing identical twins -- the differences are so small that most investors will never notice them. But those small differences do exist, and understanding them can help you make a confident decision.
VOO vs IVV: The Basics
VOO is Vanguard's S&P 500 ETF, launched in September 2010. IVV is iShares' version, launched in May 2000 -- a full decade earlier. Both funds hold the same 500 stocks in nearly identical proportions, both charge an expense ratio of 0.03%, and both have hundreds of billions in assets under management.
The reason two nearly identical products exist comes down to competition. Vanguard and BlackRock (iShares' parent company) are the two largest asset managers in the world, and the S&P 500 is the most popular index to track. Each firm wants its fund to be the default choice for investors seeking broad US equity exposure.
When you buy shares of either fund, you are getting ownership in the same 500 companies -- Apple, Microsoft, NVIDIA, Amazon, Meta, and the rest of the large-cap US stock market. The S&P 500 is a market-cap-weighted index, meaning the biggest companies get the largest positions in both funds.
For a side-by-side breakdown of holdings and performance, use the VOO vs IVV comparison tool.
Expense Ratio and Total Cost of Ownership
Both VOO and IVV charge an expense ratio of 0.03%, meaning you pay just $3 per year for every $10,000 invested. This puts them among the cheapest ETFs available anywhere. A decade ago, VOO charged 0.05% and IVV charged 0.04%. Competitive pressure has driven both to the current rock-bottom level, and it is hard to imagine them going much lower.
However, the total cost of owning an ETF goes beyond the expense ratio. Bid-ask spreads are the hidden cost of ETF ownership, especially for frequent traders. IVV tends to have slightly tighter spreads than VOO on most trading days, meaning you lose a fraction of a penny less when buying or selling. For large institutional trades of millions of dollars, this difference can add up to real money. For retail investors buying $1,000 or $10,000 at a time, the difference is measured in pennies and is not worth worrying about.
Both funds are available commission-free at virtually every major brokerage -- Fidelity, Schwab, Robinhood, Vanguard, and others. So there is no difference in trading commissions regardless of where you buy.
There is one additional cost consideration: securities lending revenue. Both funds lend shares from their portfolios to short sellers and earn income that partially offsets the expense ratio. Vanguard returns 100% of securities lending revenue to the fund (after expenses), while iShares retains a portion for BlackRock. This means VOO may have a microscopic edge in net cost, but the actual impact is a fraction of a basis point.
Performance Comparison
Since both funds track the same index with the same expense ratio, their returns are nearly identical. Over any given year, the performance difference between VOO and IVV is typically less than 0.01%. Over a decade, this compounds to a difference so small it would be difficult to detect in your portfolio balance.
The tiny variations that do exist come from several operational factors. Cash drag -- the small amount of cash each fund holds for redemptions and dividends -- affects returns slightly. The timing of when each fund receives and reinvests dividends from its holdings creates minor differences. Securities lending income, as mentioned above, also contributes. These operational details create minor tracking differences, but neither fund consistently beats the other.
If you back-test both funds over their overlapping history (since VOO's 2010 launch), the cumulative return difference is so small that transaction costs from switching between them would likely exceed any benefit from choosing the "right" one. If you are comparing both funds to decide which will give you better returns, the honest answer is: it does not matter. Pick either one and move on to decisions that actually affect your wealth, like your savings rate and asset allocation.
Fund Size and Liquidity
Both VOO and IVV are among the largest ETFs in the world, each holding hundreds of billions of dollars. IVV has a slight edge in daily trading volume, partly because it has been around longer and has deeper institutional adoption. More trading volume generally means tighter spreads and better price execution.
That said, VOO is one of the most liquid securities on any exchange. You will never have trouble buying or selling either fund at a fair price. Even during the market turmoil of March 2020, both funds maintained tight spreads and executed trades efficiently. Liquidity is genuinely a non-issue for both of these ETFs, even for trades in the millions of dollars.
One nuance worth mentioning: an ETF's liquidity is not limited to its own trading volume. The underlying S&P 500 stocks are among the most liquid securities in the world. Authorized participants can always create or redeem ETF shares by exchanging baskets of these underlying stocks, which means the effective liquidity of both VOO and IVV is essentially unlimited.
The Provider Difference: Vanguard vs iShares
The most meaningful difference between VOO and IVV is the company behind them. Vanguard has a unique mutual ownership structure -- the fund shareholders effectively own Vanguard itself, which means the company is incentivized to lower costs over time. This structure is the reason Vanguard has led the fee-cutting race for decades. There are no outside shareholders demanding higher profits at the expense of fund investors.
iShares is owned by BlackRock, a publicly traded corporation. BlackRock must balance the interests of fund shareholders with those of its own stockholders. In practice, competitive pressure has forced iShares to match Vanguard's fees on core products, so this structural difference has not led to meaningful cost differences in recent years. BlackRock's scale and distribution network have also allowed iShares to build the broadest ETF lineup in the industry.
If you are already using Vanguard's platform or have other Vanguard funds, VOO keeps things simple and keeps your portfolio under one roof. If you use Fidelity, Schwab, or another platform and already hold iShares products, IVV may be the natural choice for consistency. For a deeper look at how these two providers stack up across their full lineups, see our Vanguard vs iShares comparison.
Tax Efficiency
Both VOO and IVV are highly tax-efficient. As S&P 500 ETFs, they benefit from the in-kind creation and redemption process that minimizes capital gains distributions. Neither fund has distributed a significant capital gain in recent history, which matters in taxable brokerage accounts where capital gains distributions trigger a tax bill.
Vanguard has a patented ETF share class structure where the ETF is a share class of a larger mutual fund. This structure allows Vanguard to use mutual fund redemptions to flush out low-cost-basis shares, further reducing the chance of capital gains distributions. While this is a genuine structural advantage, IVV has also managed to avoid meaningful capital gains distributions, so the practical impact has been nil.
In tax-advantaged accounts like IRAs and 401(k)s, tax efficiency is irrelevant. In these accounts, your choice between VOO and IVV should be based entirely on other factors like platform preference and trading costs.
Dividend Payments
Both VOO and IVV pay quarterly dividends, typically in March, June, September, and December. The dividend yield is nearly identical for both -- generally between 1.2% and 1.8% depending on market conditions. Minor differences in the exact payout amount arise from differences in when each fund collects dividends from its underlying holdings and any securities lending income that flows through.
Both funds offer dividend reinvestment through most brokerages, allowing you to automatically buy more shares with each dividend payment. This is a powerful compounding mechanism that works identically for both funds.
Which Should You Choose? SPY Is Also an Option
If you are deciding between VOO and IVV, you should also know about SPY, the SPDR S&P 500 ETF. SPY is the oldest and most liquid S&P 500 ETF, launched in 1993. It charges a slightly higher expense ratio of 0.0945%, which adds up to about $6.50 more per year on a $10,000 investment compared to VOO or IVV. For most buy-and-hold investors, VOO or IVV is the better choice on cost alone. SPY's advantage is in options trading, where it has the deepest and most liquid options market of any security in the world.
There is also SPLG, the SPDR Portfolio S&P 500 ETF, which matches VOO and IVV at 0.02% and has a lower share price, making it accessible for investors who want to buy whole shares with smaller amounts. For a broader look at all four major S&P 500 ETFs, see our guide on how to choose an S&P 500 ETF. And for a direct comparison of the two most popular options, check out our SPY vs VOO analysis.
The Verdict: VOO or IVV
There is no wrong answer here. VOO and IVV are functionally identical investments. They hold the same stocks, charge the same fee, and deliver the same returns. Your decision should come down to whichever fits better into your existing brokerage setup and provider preference.
If you are a Vanguard loyalist who appreciates the mutual ownership structure, go with VOO. If you prefer iShares or already hold other iShares funds, go with IVV. If you are starting from scratch with no platform loyalty, flip a coin -- genuinely. Put your energy into saving and investing consistently rather than agonizing over a difference that amounts to pennies per year.
Browse our full ETF directory to explore other funds that might complement your S&P 500 core holding, or learn about building a complete portfolio with our ETF portfolio construction guide.
