Keeping investment costs low is one of the few things investors can control, and it makes a meaningful difference over decades. Every dollar paid in fees is a dollar that never gets a chance to compound. Exchange-traded funds have driven a race to the bottom on costs, giving you excellent options at expense ratios below 0.10%.

Here are the best low-cost ETFs to consider in 2026, organized by role in a diversified portfolio so you can build a complete allocation without overpaying.

Why Low-Cost ETFs Matter

Research consistently shows that low-cost index funds outperform most actively managed funds over long periods, largely because they keep more of the market’s returns for investors. A difference of 0.50% in annual fees might seem small, but on a $100,000 portfolio growing over 30 years, it can cost tens of thousands of dollars in lost wealth.

When comparing ETFs, focus on the expense ratio, tracking quality, fund size, and trading volume. Popular funds with billions in assets tend to have tighter bid-ask spreads, which reduces another source of hidden cost.

Best Total US Stock Market ETFs

For core US equity exposure, total market ETFs capture large-cap, mid-cap, and small-cap stocks in a single fund. These are the backbone of many long-term portfolios.

ETF	Ticker	Expense Ratio	Index Tracked
Vanguard Total Stock Market ETF	VTI	0.03%	CRSP US Total Market
iShares Core S&P Total US Stock Market ETF	ITOT	0.03%	S&P Total Market Index
Schwab US Broad Market ETF	SCHB	0.03%	Dow Jones US Broad Stock Market

All three funds offer nearly identical exposure at rock-bottom costs. Choose based on which provider you already use or prefer for other reasons like customer service and platform features.

Best S&P 500 ETFs

If you prefer a simpler large-cap focus, S&P 500 ETFs track the 500 largest US companies. They miss smaller companies but still provide broad exposure to the American economy.

1. SPDR S&P 500 ETF Trust (SPY) — The oldest and most traded S&P 500 ETF, with exceptional liquidity
2. Vanguard S&P 500 ETF (VOO) — 0.03% expense ratio with strong tracking and massive assets
3. iShares Core S&P 500 ETF (IVV) — Nearly identical to VOO in cost and holdings

SPY carries a slightly higher expense ratio at 0.09%, but its deep liquidity makes it popular with active traders. Long-term buy-and-hold investors typically prefer VOO or IVV.

Best International Stock ETFs

Diversifying beyond US borders reduces country-specific risk and captures growth in developed and emerging markets worldwide. Low-cost international ETFs make global diversification affordable.

ETF	Ticker	Expense Ratio	Coverage
Vanguard Total International Stock ETF	VXUS	0.07%	Ex-US developed and emerging markets
iShares Core MSCI Total International Stock ETF	IXUS	0.07%	Broad ex-US equities
Schwab International Equity ETF	SCHF	0.06%	Developed international markets

A common allocation splits roughly 60% to 70% of stock holdings in US funds and 30% to 40% in international funds, though your ideal mix depends on your goals and risk tolerance.

Best Bond ETFs for Stability

Bond ETFs provide income and help cushion portfolios during stock market declines. Low-cost options cover government, corporate, and aggregate bond exposures.

• Vanguard Total Bond Market ETF (BND) — 0.03% expense ratio covering US investment-grade bonds
• iShares Core US Aggregate Bond ETF (AGG) — Similar broad bond exposure at 0.03%
• Vanguard Short-Term Bond ETF (BSV) — Lower interest rate risk for conservative investors

Younger investors with long time horizons may hold a smaller bond allocation, while those nearing retirement often increase bond exposure for stability.

Best All-in-One ETFs

If you want maximum simplicity, all-in-one ETFs combine stocks and bonds in a single fund at a predetermined allocation. These are ideal for investors who prefer a hands-off approach.

ETF	Ticker	Allocation	Expense Ratio
Vanguard LifeStrategy Moderate Growth	VSMGX	60% stocks / 40% bonds	0.12%
iShares Core Growth Allocation ETF	AOR	60% stocks / 40% bonds	0.25%

Target-date ETFs are another option, automatically adjusting their stock-bond mix as you approach a target retirement year. Check whether your broker offers these before building a custom allocation.

How to Build a Low-Cost ETF Portfolio

A simple three-fund portfolio using the ETFs above covers the essentials: US stocks, international stocks, and bonds. For example, a moderate-risk investor might allocate 50% to VTI, 20% to VXUS, and 30% to BND. Rebalance once or twice per year to maintain your target percentages.

Avoid the temptation to add niche ETFs before your core allocation is established. Chasing sector funds or thematic ETFs often increases costs and concentration risk without improving long-term results for most investors.

Review your portfolio annually to confirm your funds remain among the lowest-cost options in each category. The ETF industry continues to cut fees, and newer share classes occasionally launch at even lower expense ratios. Switching between nearly identical funds is usually unnecessary, but staying informed ensures you are not overpaying for exposure you could get elsewhere for less.

Frequently Asked Questions

What is a good expense ratio for an ETF in 2026?

For broad index ETFs, anything below 0.10% is considered excellent. Many top funds now charge 0.03% to 0.07%. Actively managed or niche ETFs often charge 0.40% or more.

Are cheap ETFs lower quality than expensive ones?

Not necessarily. Low-cost index ETFs simply track an index passively without expensive research teams. Their goal is to match the market, not beat it, which keeps costs minimal.

Should I always pick the cheapest ETF in a category?

Cost matters, but also consider tracking error, fund size, liquidity, and tax efficiency. Two funds with the same expense ratio can differ slightly in how well they track their index.

Can I build a complete portfolio with just three ETFs?

Yes. A US total market ETF, an international stock ETF, and a bond ETF provide global diversification across major asset classes at very low cost.

Final Thoughts

The best low-cost ETFs in 2026 offer institutional-quality diversification at prices that were unimaginable a generation ago. Focus on broad index funds for your core holdings, keep expense ratios below 0.10%, and resist adding complexity until your foundation is solid. Over time, the money you save on fees compounds right alongside your investments.