ETFs vs. Mutual Funds: What's the Actual Difference? | Rubric Advisors

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ETFs vs. Mutual Funds: What's the Actual Difference?

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The Structural Difference

Mutual funds are priced once per day at market close; you buy and sell at that end-of-day price
ETFs trade on exchanges throughout the day like stocks — prices move in real time
Both can hold the same investments: the S&P 500 exists as ETFs (SPY, VOO) and mutual funds (VFIAX)
ETFs need a brokerage account; mutual funds can be bought directly from the fund company
For long-term investors, intraday ETF trading is largely irrelevant — not a real advantage

Tax Efficiency: ETFs Have a Structural Edge

Mutual funds must sell holdings to meet redemptions, often triggering gains taxed to all shareholders
ETFs use 'in-kind' creation/redemption to sidestep most capital gains — a big tax advantage
You can hold a broad-market ETF for decades and receive few or no capital gains distributions
In tax-advantaged accounts (IRA, 401k), this edge largely disappears since gains aren't taxed yearly
Actively-managed mutual funds are especially tax-inefficient due to frequent trading

Cost Comparison

Low-cost index ETFs and index mutual funds charge nearly identical fees — often 0.03-0.10%
Actively-managed mutual funds typically charge 0.50-1.25%; active ETFs vary more widely
Some mutual funds charge purchase or redemption fees (loads) — ETFs never have loads
ETFs may have a bid-ask spread as a small cost — negligible for major funds, worth checking for small ones
Vanguard's unique structure makes its mutual funds and ETFs nearly equivalent in tax treatment

When Mutual Funds Are Preferable

401(k) plans usually only offer mutual funds — ETFs typically aren't available in workplace plans
Auto-investing (e.g., $500/month) is seamless with mutual funds; ETFs require share-based purchases
Some mutual fund minimums have dropped to $0 at Fidelity and Schwab
Target-date and balanced funds are mostly mutual funds and handle rebalancing automatically
If you want simple automatic dividend reinvestment, mutual funds are easier to manage

When ETFs Are Preferable

Taxable accounts: ETFs' better tax efficiency reduces the annual drag from capital gains
Flexible trading: you can use limit orders, stop losses, or trade mid-day if needed
No minimums — start with one share or even a dollar with fractional shares at most brokerages
Broader access to niche strategies: sector, factor, and single-country ETFs are mostly ETF-only
For the same index, ETFs and mutual funds at major brokerages produce nearly identical long-term results

Key Takeaways

In a 401(k), use the lowest-cost mutual fund available — ETFs usually aren't an option
In a taxable account, prefer ETFs for tax efficiency, especially for broad-market index exposure
In an IRA, either works well — the ETF tax advantage doesn't matter in tax-sheltered accounts
Focus on expense ratio and underlying index first; the ETF vs. mutual fund wrapper is secondary
For Vanguard investors, equivalent ETF and mutual fund share classes have the same tax treatment

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