Last Updated: April 2026
What Is The S&P 500 And How To Invest In It: Complete April 2026 Buyer’s Guide
By Marcus Hale — 14 years self-educating in personal finance, former bank loan officer, Denver Colorado
The Short Answer
The S&P 500 is a stock market index tracking 500 of the largest publicly traded U.S. companies — and investing in it through a low-cost index fund is one of the most widely recommended starting points for long-term investors. You can’t buy the index itself, but you can buy funds designed to mirror its performance, often with no minimum balance and near-zero fees. For most people just getting started, a broad S&P 500 index fund through a brokerage with no account minimums is worth considering as a foundation.
Who This Is For ✅
- ✅ First-time investors who have heard “just invest in the S&P 500” but have no idea what that actually means or how to do it
- ✅ Working adults with a steady income who want to start building long-term wealth but feel overwhelmed by stock picking
- ✅ People in their 20s, 30s, or 40s with a time horizon of 10 or more years who can ride out market volatility
- ✅ Anyone currently keeping savings in a low-yield savings account who wants to understand whether investing in a broad market fund makes sense for their situation
Who Should Skip This Guide ❌
- ❌ Investors within 2–3 years of needing the money — market downturns can happen at any time, and S&P 500 funds carry real short-term risk
- ❌ Anyone in active financial crisis — if you have high-interest debt or no emergency fund, this guide isn’t your first step (I speak from experience on that one)
- ❌ People looking for income-focused investing strategies, like dividends or bonds — this guide is specifically about broad U.S. equity index investing
- ❌ Anyone seeking personalized investment advice for a complex financial situation — a Certified Financial Planner (CFP) is the right resource there, not a buyer’s guide
How Marcus Evaluated These
I didn’t grow up with anyone explaining index funds to me. In my 20s, I thought investing was something rich people did. By the time I figured out what the S&P 500 actually was, I’d already wasted nearly a decade with my savings sitting in a checking account earning nothing. That gap in knowledge is exactly what I’m trying to close here. I evaluated these brokerage options the same way I’d explain them to my brother-in-law — based on what actually gets in the way of starting: account minimums, fee structures, how complicated the interface is, and whether the platform makes it easy to automate contributions.
My time as a bank loan officer taught me to read fee disclosures carefully. A 1% annual fee sounds tiny until you run the math over 30 years — it can cost tens of thousands in compounded returns. So the criteria I weighted most heavily were expense ratios on the funds themselves, whether the brokerage charges trading commissions, account minimums, and ease of use for someone who doesn’t spend their evenings reading financial statements. Rates and terms change frequently — verify current details directly with each institution before opening an account.
Quick Reference Breakdown
| Option | Best For | Monthly Fee | Minimum Balance | Marcus’s Rating |
|---|---|---|---|---|
| Fidelity (FXAIX) | Cost-conscious investors wanting zero expense ratio | $0 | $0 | 5/5 |
| Vanguard (VOO) | Long-term buy-and-hold investors comfortable with a basic interface | $0 | $1 (fractional shares) | 4.5/5 |
| Charles Schwab (SCHB/SPLG) | Investors who want strong customer service alongside low costs | $0 | $0 | 4.5/5 |
| SoFi Invest | New investors who want a beginner-friendly app and fractional shares | $0 | $1 | 4/5 |
| M1 Finance | Hands-off investors who want automated portfolio “pies” with index funds | $0 (basic) | $100 to start | 3.5/5 |
| Robinhood | Mobile-first investors who want simplicity and fractional shares | $0 | $0 | 3/5 |
All fees and minimums subject to change. Verify current terms directly with each provider.
Top Picks: Marcus’s Recommendations
| Pick | Why Marcus Recommends It | Best For | One Drawback |
|---|---|---|---|
| Fidelity (FXAIX) | Historically one of the lowest expense ratios available — near zero — with no account minimum and strong research tools. This is where I’d tell my own kids to start. | Anyone starting from scratch who wants the lowest-cost option | The interface can feel dated compared to newer apps |
| Vanguard (VOO) | Vanguard pioneered the index fund concept. VOO has historically tracked the S&P 500 with very low costs and Vanguard’s ownership structure is designed to keep investor interests front and center. | Long-term, set-it-and-forget-it investors | Minimum investment requirements for some account types; website and app lag behind competitors on user experience |
| SoFi Invest | The app makes getting started genuinely easy — fractional shares mean you can invest with as little as $1, and the interface doesn’t assume you already know what you’re doing | Total beginners who want a guided, low-friction experience | Fewer fund options than full-service brokerages; expense ratios on some SoFi funds worth comparing to alternatives |
Verify current availability and terms directly with each provider, as financial products change frequently.
What Marcus Likes ✅
- ✅ Low barriers to entry: Most of these platforms now allow you to start with $1 through fractional shares — the “I don’t have enough money to start” excuse has been largely eliminated
- ✅ Automatic contributions: Every platform here supports recurring investments, which is how most regular families actually build wealth — not through timing the market, but through consistent monthly contributions
- ✅ Expense ratios are historically low: The cost of investing in S&P 500 index funds has dropped dramatically over the past two decades. The CFPB and Federal Reserve both cite low-cost index funds as a significant development in accessible retail investing
- ✅ Broad diversification in one fund: Owning an S&P 500 index fund means you own a small slice of 500 companies across multiple industries — a level of diversification that would have required enormous capital just 30 years ago
- ✅ No stock-picking required: For investors who don’t have the time or expertise to research individual companies, a fund designed to track the index removes that burden entirely
Where These Fall Short ❌
- ❌ Short-term volatility is real: The S&P 500 has historically recovered from downturns over long periods, but “historically” is doing a lot of work in that sentence. The index dropped roughly 34% in early 2020 and over 50% during the 2008 financial crisis. If you need the money in 3 years, this is not the right vehicle
- ❌ No international exposure: An S&P 500 fund covers large U.S. companies only. Many financial educators recommend pairing it with international index funds for broader diversification — something worth discussing with a CFP if your situation warrants it
- ❌ Beginner-friendly apps can have tradeoffs: Platforms built for simplicity sometimes offer fewer fund options, narrower account types, or funds with slightly higher expense ratios than dedicated investment-focused brokerages. Always check the expense ratio before you buy
- ❌ Emotional discipline is the hardest part: No platform solves the human tendency to panic-sell during a downturn. I’ve seen it happen to people who absolutely knew better — including myself in 2008
How I Tested These
I reviewed each platform’s publicly available fee disclosures, fund expense ratios, account minimums, and fractional share availability as of April 2026. I cross-referenced fee information against each brokerage’s own published documentation and checked fund-level expense ratio data through publicly available fund prospectuses. I did not receive compensation from any platform to include them in this guide. Where I couldn’t independently verify specific current data — particularly around fee structures that change frequently — I flagged those items and directed readers to confirm directly with the institution.
Marcus’s Verdict
If you’re starting from zero and your main goal is keeping costs low while getting broad U.S. market exposure, Fidelity’s FXAIX is worth a serious look — the expense ratio is historically among the lowest available, there’s no account minimum, and the research tools are solid once you’re ready to use them. If ease of use matters more than anything else right now — if the reason you haven’t started is that it all feels too complicated — then SoFi Invest may lower that friction enough to actually get you moving. Getting started imperfectly beats not starting at all. I say that as someone who waited way too long.
Whatever platform you choose, the S&P 500 index fund itself is just a tool. It has historically delivered long-term growth, but past performance is not a guarantee of future results — the Federal Reserve and the SEC both emphasize that clearly for good reason. These funds carry market risk, they can lose value, and they work best for people with long time horizons who can stay the course through downturns. If your financial situation is complicated — significant debt, approaching retirement, estate planning concerns — please talk to a Certified Financial Planner before putting money into any investment vehicle. This guide is a starting point, not a financial plan.
Authoritative Sources
- Consumer Financial Protection Bureau
- Investopedia Personal Finance Education
- NerdWallet Personal Finance Research