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Strategy6 min read

Understanding Index Fund Expense Ratios

Why a 0.015% vs. 0.04% fee matters over 18 years of tax-free growth.

When choosing a fund for your child's 530A account, one of the most important factors is the expense ratio. This guide explains what it is and why it matters.

What Is an Expense Ratio?

An expense ratio is the annual fee a fund charges to manage your money. It's expressed as a percentage of your total investment. For example, a 0.03% expense ratio means you pay $0.30 per year for every $1,000 invested.

Why It Matters

Expense ratios compound over time. Even a small difference (0.01% vs 0.04%) can add up to hundreds of dollars over 18 years, especially as the account grows with contributions.

  • Fidelity FSKAX: 0.015% expense ratio
  • Schwab SWTSX: 0.03% expense ratio
  • Vanguard VOO: 0.03% expense ratio
  • Robinhood default (S&P 500): ~0.03% expense ratio

The Math

Starting with $1,000, adding $1,000/year, at 10% average return over 18 years:

  • 0.015% expense ratio: Final value ~$45,599
  • 0.04% expense ratio: Final value ~$45,487
  • Difference: ~$112

Should You Obsess Over This?

Honestly, no. The differences between low-cost index funds are minimal. The most important thing is to open the account and start investing. Don't let analysis paralysis stop you from claiming your child's $1,000.

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