VOO vs SPY vs IVV: Which S&P 500 Index Fund Is Best for You?

If you're building a long-term investment portfolio, you've probably heard of VOO, SPY, and IVV. These three funds track the same 500 large-cap stocks, but their cost differences could save or cost you thousands of dollars over 20 years. The smallest advantage in expense ratios compounds dramatically when you're investing $10,000, $50,000, or more. In this guide, we'll show you exactly how these funds compare so you can make a data-driven decision.

What Are VOO, SPY, and IVV?

All three are exchange-traded funds (ETFs) that track the S&P 500 index. The S&P 500 represents 500 of the largest U.S. publicly traded companies—think Apple, Microsoft, Coca-Cola, and Tesla. When you own shares of VOO, SPY, or IVV, you're essentially owning a tiny slice of all 500 companies.

VOO (Vanguard S&P 500 ETF) is managed by Vanguard, one of the largest investment firms in the world with over $8 trillion in assets. Vanguard is investor-owned, meaning its clients are also its owners—a structure that aligns incentives toward keeping costs low.

SPY (SPDR S&P 500 ETF Trust) is managed by State Street Global Advisors and was actually the first S&P 500 ETF ever created (launched in 1993). It's the most widely traded ETF in the world, with trillions in assets.

IVV (iShares Core S&P 500 ETF) is managed by BlackRock, the world's largest asset manager, and represents their "core" S&P 500 offering. BlackRock has over $10 trillion in assets under management.

While all three track the same index, their differences in expense ratios, trading volume, and fund structures can meaningfully impact your returns.

Expense Ratios: The Cost Breakdown

The biggest financial difference between VOO, SPY, and IVV is their expense ratio—the annual percentage you pay to own the fund. Even a 0.10% difference might sound tiny, but it compounds aggressively.

Let's model this with a realistic scenario: You invest $50,000 in your 401(k) or IRA and add $500 monthly for 30 years. Assuming 8% annual returns:

• VOO (0.03% expense ratio): Final balance = $1,285,450
• IVV (0.04% expense ratio): Final balance = $1,283,920
• SPY (0.09% expense ratio): Final balance = $1,277,680

Over 30 years, SPY costs you approximately $7,770 more than VOO due to the higher expense ratio alone. That's not a typo—it's the power of compounding working against you.

As of 2026, here are the confirmed expense ratios:

VOO's 0.03% expense ratio is the lowest among the three and is one of the cheapest S&P 500 ETFs available anywhere. IVV is nearly identical at 0.04%. SPY's 0.09% is three times higher than VOO, which seems steep until you understand why.

Why Does SPY Cost More?

You might wonder: if SPY is the oldest and most traded S&P 500 ETF, why is it the most expensive?

Historically, SPY's higher expense ratio reflected the cost of maintaining a trust structure rather than a traditional ETF. State Street has kept it at 0.09% for decades, even as competitors have undercut it. Some analysts believe State Street keeps the fee higher because SPY's massive trading volume ($300+ billion daily) generates significant revenue through trading spreads and market maker activity.

For retail investors using a Fidelity Roth IRA, Schwab brokerage account, or other commission-free broker, SPY's higher cost directly reduces your long-term wealth accumulation. The only reason SPY remains popular is brand recognition and historical inertia—many 401(k) plans and institutional investors bought SPY years ago and never switched.

Performance: Are They Actually Different?

Since all three funds track the same S&P 500 index, their performance is virtually identical. Year-to-date returns through 2026 show minimal variation:

• VOO: +18.2% (2025 performance)
• IVV: +18.1% (2025 performance)
• SPY: +18.0% (2025 performance)

These tiny differences are due to timing of fund purchases, dividend reinvestment schedules, and cash drag (holding small amounts of cash to meet redemptions). Over a full market cycle, these differences round to zero. Your real gain comes from owning the S&P 500 itself, not from picking between these three funds.

If you're concerned about long-term performance, focus on the broader S&P 500's historical 10% average annual return rather than micro-optimizing between VOO, IVV, and SPY.

Liquidity and Trading Volume

Liquidity refers to how easily you can buy and sell shares without affecting the price.

SPY dominates here with $300+ billion in daily trading volume. If you place a market order for SPY, it will execute instantly with minimal price slippage. This matters if you're a day trader or frequently moving money in and out.

VOO has approximately $30 billion in daily volume—still extremely liquid. For a typical investor buying $1,000–$50,000 worth, you'll experience no noticeable difference compared to SPY.

IVV has roughly $10–15 billion in daily volume, which is lower but still plenty liquid for retail investors. You might see a slightly wider bid-ask spread (the difference between buying and selling price) of a few cents, which for most people is negligible.

For long-term buy-and-hold investors in a Roth IRA or taxable brokerage account, liquidity differences are irrelevant. You're not trading daily—you're buying and holding for decades.

Tax Efficiency Comparison

All three funds are structured as ETFs, which are generally more tax-efficient than mutual funds. ETFs use a mechanism called "in-kind redemption" that minimizes the distribution of taxable capital gains.

In practice, VOO, IVV, and SPY all rank in the top tier for tax efficiency. Your tax liability depends more on your trading frequency (buying and selling often triggers capital gains) than on which of these three funds you choose.

One advantage for UK readers: if you're investing from the UK in a pension or ISA, you can easily buy VOO, IVV, or SPY through platforms like Interactive Investor or AJ Bell. For Australian or Canadian investors, these funds are available on most major brokers as well.

Real-World Investing Scenarios

Scenario 1: Building a 401(k) through your employer

If your 401(k) offers all three funds, choose VOO. Its 0.03% expense ratio will outpace SPY significantly over 30+ years. Many employers offer Vanguard funds through their 401(k) plan, making VOO the default smart choice.

Scenario 2: Opening a Fidelity Roth IRA

Fidelity offers all three funds with zero trading commissions. If you plan to add $500–$1,000 monthly for the next 20 years, VOO's lower expense ratio saves you approximately $3,000–$4,000 in fees over your investing lifetime. Open your Fidelity Roth IRA and set up automatic monthly investments in VOO.

Scenario 3: Choosing for a taxable brokerage account

If you have taxable income and are saving beyond your Roth IRA or 401(k) limits, VOO remains the cost-efficient choice. At Charles Schwab or other brokers, you can set up a taxable account and buy VOO with zero commissions.

Scenario 4: You want diversification beyond just the S&P 500

If you're building a complete portfolio, consider pairing your S&P 500 fund with small-cap or international index funds. A common allocation is 70% S&P 500 (VOO, SPY, or IVV) + 20% small-cap index + 10% international index. This reduces concentration risk while maintaining low costs.

Which Fund Should You Actually Buy?

Based on 15+ years of investment experience and data analysis, here's our ranking:

1. VOO (Vanguard S&P 500 ETF) — Best Overall Choice

• Lowest expense ratio at 0.03%
• Vanguard's investor-owned structure keeps costs low
• Excellent liquidity ($30B+ daily volume)
• Available at virtually every major broker
• Recommended for 401(k) plans, Roth IRAs, and taxable accounts

2. IVV (iShares Core S&P 500 ETF) — Solid Alternative

• Nearly identical 0.04% expense ratio
• BlackRock's scale and reliability
• Good liquidity for retail investors
• Slightly lower trading volume than VOO or SPY
• Only choose IVV if VOO is unavailable or if you already own BlackRock funds

3. SPY (SPDR S&P 500 ETF Trust) — Only If You Must

• 0.09% expense ratio (3x higher than VOO)
• Highest trading volume (useful only for day traders)
• Legacy choice; newer investors should avoid
• Costs $7,770 more over 30 years compared to VOO
• Consider switching if you currently own SPY

How to Get Started

Step 1: Open an investment account

Choose a broker offering zero commissions on ETF trades. Top choices include Fidelity, Charles Schwab, E*TRADE, or Vanguard itself. These firms offer Roth IRAs, traditional IRAs, and taxable brokerage accounts.

Step 2: Decide between Roth IRA and taxable account

If you earn under $161,000 (2026 limit for single filers) and have earned income, max out a Roth IRA first. You can contribute $7,000 annually and watch it grow tax-free forever. Learn more about best high-yield savings accounts 2026 to keep your emergency fund separate from investments.

Step 3: Set up automatic monthly investments

If you can invest $500 monthly, set up automatic purchases of VOO. Dollar-cost averaging (buying the same amount monthly regardless of price) removes emotion from investing and harnesses the power of compounding.

Step 4: Review once yearly, don't trade

Check your investment quarterly for motivation, but avoid trading. Buying and selling triggers capital gains taxes and trading costs. A buy-and-hold strategy for 20+ years is proven to build wealth; frequent trading usually destroys it.

Step 5: Increase contributions as income grows

When you get a raise, increase your monthly VOO investment by 50% of the raise. This painless approach lets your investments scale with your career growth.

If you're concerned about high-interest debt, consider reading how to pay off credit card debt fast: 7 proven strategies before investing heavily. Paying off a 22% Discover card is a guaranteed better return than any stock investment.

For International Readers

UK Investors: VOO, IVV, and SPY are available through Stocks & Shares ISAs on platforms like Interactive Investor and AJ Bell. ISAs provide tax-free growth, making them superior to taxable brokerage investing. VOO remains the cost-efficient choice.

Canadian Investors: These U.S.-listed ETFs are available on TSX through CIBC, TD Direct Investing, and other brokers. However, Canadian investors might also consider Canadian-listed equivalents like VFV (Vanguard U.S. Total Market), which offers similar benefits without currency conversion fees on reinvested dividends.

Australian Investors: VOO, IVV, and SPY are available on Australian exchanges and through brokers like Selfwealth and Stake. Consider using Australian franked dividend ETFs (VAS) alongside U.S. exposure for tax efficiency under the Australian tax system.

FAQ: VOO vs SPY vs IVV

Q: Can I hold all three funds at the same time? A: Technically yes, but it's unnecessary. Holding VOO, IVV, and SPY simultaneously means you own the same 500 stocks three times over, which dilutes diversification and increases fees. Pick one—VOO is best—and stick with it.

Q: What's the bid-ask spread and does it matter? A: The bid-ask spread is the difference between the buying price and selling price. For VOO, SPY, and IVV, spreads are typically $0.01–$0.05 per share on orders under $100,000. This is negligible for long-term investors. For a $10,000 purchase, the spread costs you roughly $5–$10, which is recovered in months through dividend reinvestment.

Q: Should I buy VOO in my 401(k) or a Roth IRA? A: Both work excellently. Roth IRAs offer tax-free growth and withdrawals after age 59½, making them ideal for younger investors. 401(k)s offer higher contribution limits ($24,500 in 2026 vs. $7,000 for Roth IRAs) and potentially employer matching. Maximize your employer 401(k) match first, then max out a Roth IRA, then return to 401(k) contributions if possible.

Q: Is 0.03% vs. 0.09% really that significant? A: Yes. On a $50,000 initial investment plus $500 monthly for 30 years at 8% returns, VOO's lower expense ratio saves you $7,770 compared to SPY. That's a brand-new car or a year of retirement income. Never underestimate the power of small cost differences in long-term investing.

Q: What if my employer 401(k) only offers SPY? A: Take advantage of employer matching first (free money), then consider rolling over to a Roth IRA where you can choose VOO. If you can't roll over, SPY's higher cost is worth accepting to capture employer match. A 5% employer match dwarfs the 0.06% annual cost savings you'd get by switching to VOO.

Q: Does VOO pay dividends and are they automatically reinvested? A: Yes, VOO pays dividends quarterly (approximately 1.3–1.5% yield annually). Most brokers automatically reinvest dividends at no cost in a Roth IRA or 401(k). In taxable accounts, dividends are taxed as qualified dividend income, usually at lower rates than ordinary income. This is why Roth IRAs are superior for long-term wealth building.

Q: Can I use VOO, IVV, or SPY as a complete portfolio? A: Technically yes, but it's not optimal. A complete portfolio includes U.S. large-cap (VOO), small-cap (VB or VBR), international developed markets (VXUS), and emerging markets (VWO). A 70% VOO + 30% VXUS portfolio captures global diversification while keeping costs at 0.05% or lower. This is better than relying 100% on U.S. stocks.

The Bottom Line

VOO, SPY, and IVV all own the same 500 companies and deliver nearly identical returns. The real difference is cost: VOO's 0.03% expense ratio saves you thousands of dollars over a 30-year investing lifetime compared to SPY's 0.09%. For your Roth IRA, 401(k), or taxable brokerage account, choose VOO and set up automatic monthly investments. Start today, stay disciplined, and let compound growth build your wealth. Before you invest aggressively, ensure high-interest credit card debt is eliminated—earning 8% in the stock market while paying 22% on debt is a losing game.

Next Steps:

1. Open a Fidelity or Charles Schwab account if you don't have one
2. Fund your Roth IRA with $7,000 this year
3. Select VOO as your core holding
4. Set up $500–$1,000 monthly automatic purchases
5. Review once yearly, but never sell during market downturns