A Foundation for Long-Term Investing: Ultra-Low-Cost Core ETFs

Why Costs Matter

The difference between a 0.03% and 0.75% expense ratio may appear trivial, less than one percentage point. But this small annual difference compounds dramatically over time, ultimately transforming into one of the largest determinants of investment success. The reason is mathematical: fees reduce returns every year, and those reduced returns then compound at the lower rate.

The Compounding Effect of Low Costs

On a $500,000 portfolio over 30 years at 7% annual growth, a 0.03% expense ratio costs approximately $4,500 in total fees, while a 0.75% expense ratio costs roughly $340,000. The difference exceeds $335,000 : money that either compounds in your account or transfers to fund companies.

This happens because fees don't simply subtract from returns; they compound against you. The higher-fee fund earns less each year, and that smaller balance then earns less the following year, creating a widening gap that accelerates over time.

The ETFs in this guide share four characteristics that contribute to their cost efficiency. They maintain expense ratios of 0.03% or lower, among the cheapest investment vehicles in the world. High trading volume ensures tight bid-ask spreads and easy execution. Broad diversification covers entire market segments rather than narrow slices, eliminating the need for multiple holdings. And established track records from reputable providers offer confidence in fund management and index tracking.

Note on securities lending: Many large ETFs earn additional income by lending securities to short sellers. This practice can slightly offset expense ratios but introduces minimal counterparty risk (mitigated by collateral requirements). Most major ETF providers share a portion of securities lending revenue with shareholders, which helps keep expense ratios low.

Bid-ask spread awareness: While expense ratios receive the most attention, bid-ask spreads represent another cost of ETF ownership. Larger, more liquid ETFs like VOO and VTI typically have spreads of $0.01 or less, while smaller or less liquid ETFs may have wider spreads. For buy-and-hold investors, this difference is minimal, but frequent traders should consider spreads as part of total cost.

Core U.S. Equity ETFs (Expense Ratio: 0.03% or less)

These funds provide the cheapest and most liquid exposure to U.S. equities, the largest and most efficient stock market in the world. The extreme cost efficiency exists because of massive scale: these funds collectively hold trillions of dollars, which spreads fixed costs across an enormous asset base and drives expense ratios to near-zero levels.

S&P 500 vs. Total Market: Which to Choose?

Bottom line: Both approaches are excellent, and performance differences over time are typically small. Choose based on personal preference or simply use whichever is available in your 401(k). This decision matters far less than maintaining low costs and staying invested. For a deeper analysis of the differences between these approaches, see our Total Market Fund vs S&P 500 comparison guide.

Core Non-U.S. Equity ETFs (Expense Ratio: 0.03% or less)

International diversification reduces dependence on any single economy and captures growth wherever it occurs globally. These funds provide exposure to developed markets outside the United States, primarily Japan, the United Kingdom, Germany, France, Canada, and Australia, at the same ultra-low costs as U.S. funds.

Why International Diversification Matters

Core Fixed Income (Bond) ETFs (Expense Ratio: 0.03% or less)

Bonds serve a fundamentally different role than stocks: they provide portfolio stability and predictable income rather than growth. These funds track the most common investment-grade bond indices at costs that were unthinkable a generation ago, enabling efficient fixed-income exposure for investors of all sizes.

Taxable vs. Tax-Exempt Bonds

The choice between taxable and tax-exempt bonds depends primarily on where you hold them and your tax bracket. This decision matters significantly because bond interest is typically taxed at higher ordinary income rates.

Understanding Total Market Allocation

True global market coverage requires blending U.S. and international equities according to their market capitalization weights. This approach ensures you own every publicly traded company in proportion to its size, the simplest, most neutral way to capture global equity returns.

Building Global Equity Exposure

Combining ultra-low-cost ETFs creates complete global coverage at minimal cost. The following allocation approximates market-cap weights:

This three-fund equity allocation provides exposure to over 10,000 stocks across 40+ countries for an average cost of approximately 0.04% per year. In practice, this means paying roughly $40 annually per $100,000 invested, a cost so low it becomes nearly irrelevant to long-term returns.

Building Your Portfolio

These ultra-low-cost building blocks combine into complete, globally diversified portfolios requiring only 3-4 funds. The simplicity is a feature, not a limitation: fewer holdings mean lower complexity, easier rebalancing, and reduced opportunity for behavioral mistakes.

The Classic Three-Fund Portfolio

Sample Allocations by Risk Tolerance

Key Takeaways

Expense ratios compound dramatically. A 0.03% fund costs roughly $300 per $1 million annually while a 0.75% fund costs $7,500, a 25x difference. Over decades, this gap compounds to hundreds of thousands of dollars in lost wealth. The mathematics are unforgiving: every dollar paid in fees is a dollar that never compounds.

Low-cost ETFs provide complete coverage. VOO, VTI, VEA, and AGG together cover U.S. stocks, international stocks, and investment-grade bonds at competitive costs. There is no investment need that requires paying more for these core building blocks.

Global diversification is straightforward. A 60/40 split between U.S. and international stocks approximates global market weights and reduces concentration in any single economy. This approach captures returns wherever they occur without requiring predictions about regional performance.

Match bonds to account type. Use taxable bond funds (AGG, SPAB) in tax-advantaged accounts where interest accumulates without taxation. Use municipal bond funds (VTEB) in taxable accounts if you're in a higher tax bracket. This matching optimizes after-tax returns without adding complexity.

Simplicity compounds like returns do. A three-fund portfolio using ultra-low-cost ETFs outperforms most complex strategies over extended periods, not despite its simplicity, but because of it. Fewer decisions mean fewer mistakes, and lower costs mean more returns compound in your account.

Bottom Line: The ETFs in this guide represent among the cheapest, most efficient building blocks for long-term portfolios. By minimizing costs and maximizing diversification, you keep more of your returns, and that's a foundation of effective long-term investing.

Related Guides

• Direct Indexing Guide: When tax-optimized separate accounts make sense (and when simple ETFs remain the better choice)
• Active vs. Passive Investing: Why index funds outperform most active strategies
• Equity Income Strategies: Generate income from your core ETF positions without selling shares
• Tax-Loss Harvesting: Maximizing after-tax returns on your ETF portfolio
• Buying Bonds Through Retail Brokers: How to purchase individual bonds for your fixed income allocation
• Executing Stock Trades: How to execute trades online when building your ETF portfolio