IVV ETF Review 2026: iShares Core S&P 500 vs VOO

Ask any index fund investor to name two S&P 500 ETFs and you’ll almost certainly hear IVV and VOO. Both are massive, low-cost, and track the same benchmark. So why does the IVV ETF review question come up so often — and is there actually a meaningful difference? Let’s find out.

IVV at a Glance

The iShares Core S&P 500 ETF (IVV) is managed by BlackRock and launched in May 2000 — making it one of the oldest S&P 500 ETFs in existence. As of early 2026, IVV holds over $500 billion in assets under management, making it the second-largest ETF in the world by AUM.

IVV’s objective is straightforward: track the performance of the S&P 500 Index as closely as possible, before expenses. It holds all 500 constituent stocks in proportion to their market cap weight.

VOO at a Glance

The Vanguard S&P 500 ETF (VOO) launched in September 2010 and has grown to over $550 billion in AUM, making it arguably the largest ETF in the world. VOO is managed by Vanguard, the firm founded by John Bogle — the man who invented the index fund.

Like IVV, VOO tracks the S&P 500 exactly, holding all 500 stocks in market-cap proportion.

Expense Ratio: Dead Heat

Both IVV and VOO charge an expense ratio of 0.03% per year — equivalent to $0.30 per $1,000 invested annually. This is near the theoretical floor for expense ratios.

A decade ago, IVV charged 0.09% while Vanguard undercut the industry at 0.05%. Since then, both firms have raced to the bottom, and today the cost difference is zero for practical purposes. If you had $100,000 invested, the difference between the two funds’ annual fees would be literally $0.

Performance: Essentially Identical

Since both funds track the same index, their performance is nearly indistinguishable over any meaningful time period. Minor differences in returns arise from:

• Dividend reinvestment timing — slight differences in when dividends are distributed
• Securities lending income — both funds lend securities to generate additional return
• Tracking error — microscopic differences in how accurately each fund follows the index

Over 5 and 10-year periods, the cumulative performance difference between IVV and VOO is typically less than 0.05% — statistically meaningless for most investors.

Liquidity: IVV Has a Slight Edge Institutionally

IVV trades approximately $2–3 billion in daily volume, while VOO trades roughly $1–2 billion. Both are highly liquid, but IVV’s larger institutional following means its bid-ask spread can be marginally tighter during normal market hours.

For retail investors buying $1,000 or $10,000 at a time, this difference is negligible — we’re talking about fractions of a cent per share. For institutions moving hundreds of millions at a time, IVV’s superior liquidity can matter.

Tax Efficiency: Both Excellent, Vanguard Has a Patent Advantage

This is where things get interesting. Vanguard holds a patent (now expired, as of 2023) for a structure that allows its ETF share class and mutual fund share class to coexist within the same fund, providing exceptional tax efficiency through in-kind redemptions.

That said, both IVV and VOO are extremely tax-efficient by any reasonable standard. In most years, both funds distribute zero or near-zero capital gains distributions. For taxable brokerage accounts, both are excellent choices.

After Vanguard’s patent expired in 2023, other fund companies have been working to implement similar structures — which may improve IVV’s tax efficiency further in coming years.

Bid-Ask Spread

The bid-ask spread is the difference between what buyers will pay and what sellers will accept. For highly liquid ETFs, this is typically 1 cent or less per share. Both IVV and VOO consistently trade with $0.01 spreads during regular market hours.

At ~$560/share for IVV and ~$500/share for VOO (approximate 2026 prices), a $0.01 spread represents roughly 0.002% of the share price — completely immaterial for long-term investors.

Key Structural Difference: Fund Ownership

Vanguard is unique in the fund industry: it’s owned by its funds, which are owned by its investors. There are no outside shareholders extracting profit. This creates structural alignment between Vanguard and its investors that BlackRock — a publicly traded company (BLK) with obligations to its own shareholders — cannot fully replicate.

Does this matter practically? In the short term, not much — both currently charge 0.03%. But over decades, Vanguard’s model creates an inherent pressure to keep costs low, while BlackRock must balance investor interests against corporate profitability.

Which Should You Buy?

Factor	IVV	VOO
Expense Ratio	0.03%	0.03%
AUM	~$500B	~$550B
Daily Volume	Higher	High
Dividend Frequency	Quarterly	Quarterly
Fund Ownership	BlackRock (public company)	Investor-owned
Best Platform	TD Ameritrade, Fidelity	Vanguard, Schwab

Bottom line for most investors: Buy whichever is available on your brokerage platform with no transaction fees. If your broker offers both equally, either is an excellent choice. Long-term, VOO’s ownership structure may provide a slight philosophical edge, but both funds will almost certainly produce near-identical outcomes over a 20–30 year holding period.

Don’t overthink this one. The worst decision you can make is to delay investing while trying to pick between two functionally identical products.

---

Disclosure: This article may contain affiliate links. We may earn a commission if you click through and make a purchase, at no additional cost to you. All opinions are our own. See our Editorial Policy for details.