S&P 500 ETF Guide: VOO vs SPY vs IVV Compared for Beginners

The S&P 500 is a stock market index tracking the 500 largest US-listed companies, representing roughly 80% of total US stock market value. The simplest way to invest in it is through an ETF: VOO (Vanguard, 0.03% fee), SPY (State Street, 0.0945% fee), or IVV (iShares, 0.03% fee). For long-term investors, VOO or IVV are optimal due to lower fees. SPY is better for active traders who need maximum liquidity. All three deliver virtually identical long-term returns. The recommended strategy is dollar-cost averaging — investing a fixed amount on a regular schedule regardless of market conditions.

Disclaimer: This article is educational content, not financial advice. Investing involves risk, including the potential loss of principal. Past performance does not guarantee future results. Consider consulting a licensed financial advisor for personalized guidance.

What Is the S&P 500?

The Standard & Poor’s 500 Index, commonly called the S&P 500, is a stock market index that tracks the performance of 500 of the largest companies listed on US stock exchanges.

Think of it as a scorecard for the American economy. When financial news says “the market was up today,” they are usually referring to the S&P 500.

What Companies Are in the S&P 500?

The index includes household names you likely interact with daily:

• Technology: Apple, Microsoft, NVIDIA, Google, Meta
• Healthcare: UnitedHealth, Johnson & Johnson, Eli Lilly
• Finance: Berkshire Hathaway, JPMorgan Chase, Visa
• Consumer: Amazon, Tesla, Costco, McDonald’s
• Energy: ExxonMobil, Chevron

Companies are added and removed by a committee based on criteria including market capitalization, profitability, and trading volume. The index is weighted by market cap, meaning larger companies have a bigger influence on the index’s performance.

Why Is the S&P 500 So Popular?

Several reasons:

• Diversification. One purchase gives you exposure to 500 companies across 11 sectors.
• Historical performance. Roughly 10% average annual return over the long term.
• Low maintenance. No need to research individual companies or rebalance.
• Warren Buffett’s endorsement. He has repeatedly advised most investors to just buy an S&P 500 index fund.
• Professional track record. Over any 15-year period, the S&P 500 has outperformed roughly 90% of actively managed funds.

That last point deserves emphasis. Professional fund managers with teams of analysts, decades of experience, and millions in research budgets cannot consistently beat this simple index. That is why index investing has become so popular.

What Is an S&P 500 ETF?

An ETF (Exchange-Traded Fund) is a fund that trades on the stock exchange like an individual stock. An S&P 500 ETF holds shares of all 500 companies in the index, proportional to their market cap weightings.

When you buy one share of an S&P 500 ETF, you effectively own a tiny piece of all 500 companies. The ETF automatically rebalances when companies are added or removed from the index.

Why ETFs Over Mutual Funds?

S&P 500 index mutual funds (like VFIAX) exist too. But ETFs have advantages:

• Trade throughout the day at real-time prices (mutual funds only trade at end-of-day price)
• Lower minimum investments (buy fractional shares; mutual funds often require $1,000-$3,000 minimum)
• More tax-efficient due to creation/redemption mechanism
• Available at any brokerage (some mutual funds are only available through their own company)

For most people in 2026, S&P 500 ETFs are the simplest and most cost-effective option.

VOO vs SPY vs IVV: Head-to-Head Comparison

These are the three largest S&P 500 ETFs. Let me break down exactly how they differ.

The Numbers at a Glance

Feature	VOO	SPY	IVV
Full Name	Vanguard S&P 500 ETF	SPDR S&P 500 ETF Trust	iShares Core S&P 500 ETF
Provider	Vanguard	State Street	BlackRock (iShares)
Launch Year	2010	1993	2000
Expense Ratio	0.03%	0.0945%	0.03%
Assets Under Management	~$500B+	~$550B+	~$500B+
Average Daily Volume	High	Highest	High
Dividend Frequency	Quarterly	Quarterly	Quarterly
Fund Structure	Open-end ETF	Unit Investment Trust	Open-end ETF

Expense Ratio: VOO and IVV Win

The expense ratio is the annual fee charged by the fund, expressed as a percentage of your investment. It is deducted automatically from the fund’s returns.

• VOO: 0.03% ($3 per $10,000 invested per year)
• IVV: 0.03% ($3 per $10,000 invested per year)
• SPY: 0.0945% ($9.45 per $10,000 invested per year)

The difference seems tiny, but it compounds over time:

On a $10,000 investment over 30 years at 10% average annual return:

• VOO/IVV (0.03%): You keep approximately $172,800
• SPY (0.0945%): You keep approximately $171,500

That is roughly $1,300 more over 30 years on a single $10,000 investment. With larger investments and longer time horizons, the gap widens further.

Liquidity: SPY Wins

SPY is the most heavily traded ETF in the world. Its average daily trading volume dwarfs VOO and IVV combined.

Why does this matter? For most buy-and-hold investors, it does not. The bid-ask spread on all three ETFs is extremely tight — typically one cent or less.

But for active traders making frequent large trades, SPY’s superior liquidity means:

• Tighter bid-ask spreads during volatile markets
• Easier to execute large block trades
• Better options market (more strikes, tighter spreads)

If you are buying and holding for the long term, liquidity differences are irrelevant. If you trade options on the S&P 500, SPY is the clear choice.

Fund Structure: VOO and IVV Win

SPY is structured as a Unit Investment Trust (UIT), an older fund structure from 1993. VOO and IVV are structured as open-end ETFs.

This matters for two reasons:

Dividend reinvestment. SPY cannot automatically reinvest dividends between distribution dates. It holds them as cash, creating a small “cash drag” on returns. VOO and IVV can reinvest dividends immediately.

Securities lending. VOO and IVV can lend out their holdings to generate additional income, slightly boosting returns. SPY cannot.

These differences are small — fractions of a basis point — but over decades they add up in favor of VOO and IVV.

Dividend Yields

All three ETFs pay quarterly dividends representing the combined dividends of their underlying S&P 500 holdings. The yields are virtually identical since they hold the same stocks.

Current approximate dividend yield: 1.2-1.5% (varies with market conditions).

Dividends are a nice bonus but should not be your primary reason for choosing one over another. The yield difference between these three ETFs is negligible.

Want higher dividend income? Check out our global dividend stocks guide

So Which One Should You Buy?

Here is my straightforward recommendation:

Buy VOO or IVV if:

• You are a long-term buy-and-hold investor
• You want the lowest possible fees
• You plan to dollar-cost average over years or decades
• You do not trade options on the S&P 500

Buy SPY if:

• You actively trade (day trading, swing trading)
• You trade S&P 500 options
• You need maximum liquidity for large transactions
• Your brokerage offers better tools for SPY specifically

For the vast majority of individual investors reading this guide, VOO or IVV is the better choice. The lower expense ratio saves you money every year, and the structural advantages compound over time.

Between VOO and IVV, the differences are so small that it genuinely does not matter. Pick whichever is available at your brokerage, or whichever provider you prefer. Many people choose VOO simply because Vanguard’s investor-friendly reputation, but IVV is equally excellent.

How to Buy Your First S&P 500 ETF

Step 1: Open a Brokerage Account

If you do not already have one, open an account at a major brokerage. All of these offer commission-free trading and fractional shares:

• Fidelity — Excellent research tools and customer service
• Charles Schwab — Great all-around platform
• Vanguard — Natural home for VOO investors
• Interactive Brokers — Best for international investors

The account opening process typically takes 10-15 minutes and requires your name, address, social security number (or equivalent tax ID), and bank account for funding.

Step 2: Choose Your Account Type

• Roth IRA: Best for most people under 50. Tax-free growth and withdrawals in retirement.
• Traditional IRA: Tax-deductible contributions now, taxed on withdrawal.
• Taxable brokerage: No tax advantages but no contribution limits or withdrawal restrictions.
• 401(k): If your employer offers one with S&P 500 index fund option, use it — especially if they match contributions.

Not sure where to start with investing? Read our complete beginner’s guide

Step 3: Fund Your Account

Transfer money from your bank account. Most brokerages process transfers in 1-3 business days, though some offer instant provisional credit for immediate trading.

Step 4: Place Your Order

Search for the ticker symbol (VOO, SPY, or IVV), enter the number of shares or dollar amount (if using fractional shares), and place a market order during trading hours (9:30 AM - 4:00 PM Eastern Time).

A few tips for your first purchase:

• Use market orders for simplicity. Limit orders are fine too, but unnecessary for highly liquid ETFs.
• Buy during regular market hours. Avoid pre-market and after-hours trading when spreads are wider.
• Do not stress about timing. Whether you buy at $520 or $525 per share will not matter 20 years from now.

Step 5: Set Up Automatic Investments

This is the most important step. Set up recurring automatic investments — weekly, biweekly, or monthly — to consistently add to your position. Most brokerages support this feature.

Automatic investing removes emotion from the equation. You invest the same amount whether the market is up 5% or down 5%. Over time, this dollar-cost averaging approach has proven highly effective.

The Dollar-Cost Averaging Strategy

Dollar-cost averaging (DCA) means investing a fixed dollar amount at regular intervals, regardless of the current price.

How DCA Works in Practice

Let us say you invest $500 per month in VOO:

Month	VOO Price	Shares Bought
January	$500	1.000
February	$480	1.042
March	$520	0.962
April	$460	1.087
May	$510	0.980
June	$530	0.943

After 6 months, you have invested $3,000 and own 6.014 shares at an average cost of $499 per share. You naturally bought more shares when prices were low and fewer when prices were high.

Why DCA Beats Trying to Time the Market

Studies consistently show that dollar-cost averaging outperforms market timing for most investors because:

• Nobody can consistently predict short-term market movements
• Waiting for the “perfect” entry point often means missing gains
• DCA builds discipline and removes emotional decision-making
• It works automatically, requiring no market analysis

The caveat: if you have a large lump sum to invest, research suggests that investing it all at once (“lump sum investing”) produces slightly higher returns about two-thirds of the time, because markets trend upward. But DCA produces better results psychologically — you avoid the regret of investing everything right before a downturn.

Common Mistakes to Avoid

Switching Between VOO, SPY, and IVV

Some investors constantly switch between these ETFs trying to optimize for tiny fee differences or tracking error. The transaction costs, tax implications, and mental energy of switching far outweigh any marginal benefit. Pick one and stick with it.

Selling During Market Drops

The S&P 500 drops 10% or more roughly once per year on average. Drops of 20% or more happen roughly every 3-5 years. These are normal. Every single time, the market has eventually recovered and reached new highs.

If you sell during a drop, you lock in losses and miss the recovery. The investors who build the most wealth are those who stay invested through downturns.

Checking Your Portfolio Daily

Daily price movements are noise. Your S&P 500 investment is a decades-long commitment. Checking daily leads to anxiety and tempts you to make emotional trades. Check monthly or quarterly at most.

Ignoring Tax-Advantaged Accounts

Investing in a taxable brokerage account when you have unused Roth IRA or 401(k) space is leaving money on the table. Maximize tax-advantaged accounts first — the tax savings compound just like your investment returns.

Over-Diversifying Beyond the S&P 500

The S&P 500 already provides significant diversification across 500 companies and 11 sectors. You do not need to add 10 other funds to be “more diversified.” A simple portfolio of S&P 500 ETF + international ETF + bond ETF covers all the diversification most people need.

Should you pick ETFs or individual stocks? Here’s how to decide

What Returns Can You Realistically Expect?

The S&P 500’s historical average annual return is approximately 10% (before inflation) or about 7% (after inflation).

But “average” is misleading because individual years vary wildly:

• Best recent years: Some years gain 20-30%+
• Worst recent years: Some years drop 20% or more
• Average year: Positive returns roughly 75% of the time

The key is time horizon. Over any 1-year period, returns are unpredictable. Over 15-20 year periods, the S&P 500 has never produced negative returns.

Projection Examples (10% Average Annual Return)

Monthly Investment	10 Years	20 Years	30 Years
$100/month	$20,500	$76,600	$226,000
$300/month	$61,500	$229,800	$678,000
$500/month	$102,400	$383,000	$1,130,000
$1,000/month	$204,800	$766,000	$2,260,000

These are projections, not guarantees. Actual returns will vary. But the power of consistent investing over long periods is clear.

Beyond the S&P 500: Building a Complete Portfolio

An S&P 500 ETF is an excellent core holding, but you might want to complement it for broader diversification:

• International stocks (VXUS or IXUS): Exposure to companies outside the US. Recommended allocation: 20-30%.
• Bonds (BND or AGG): Reduces portfolio volatility. More important as you approach retirement. Start with 10-20% if you are young.
• Small-cap stocks (VB or IJR): Smaller companies with higher growth potential and higher risk.

A simple, effective three-fund portfolio:

• 60% VOO (US large-cap)
• 30% VXUS (International)
• 10% BND (Bonds)

Adjust the percentages based on your age and risk tolerance. Younger investors can lean more heavily toward stocks; those closer to retirement should increase bond allocation.

The Bottom Line

Investing in an S&P 500 ETF is one of the simplest, most effective wealth-building strategies available. VOO and IVV are the best choices for long-term investors due to their lower fees and better fund structure. SPY is ideal for active traders.

The most important decision is not which ETF to pick — it is starting and staying consistent. Set up automatic monthly investments, resist the urge to time the market, and let compound growth work over decades.

If you take one thing from this guide: open a brokerage account this week, buy your first shares of VOO (or IVV), and set up a recurring monthly investment. Your future self will thank you.