How Many ETFs Should I Invest In? Australian Guide (2026)

Most Australians need one to three ETFs. One diversified all-in-one ETF (such as DHHF or VDHG) is enough on its own. Two ETFs, an Australian one plus a global one, give you control over the split at a lower fee. A third can add emerging markets or bonds. Beyond that, extra ETFs mostly buy the same companies again and add brokerage, tax statements and rebalancing work.

Why one ETF can be enough

A single broad ETF already holds far more companies than any individual investor could:

Sources: BetaShares DHHF (30 September 2026); Vanguard ETFs at a glance (30 June 2026).

DHHF's target mix is 37.2% Australian shares, 40.5% US, 15.2% other developed markets and 7.0% emerging markets (BetaShares). The fund keeps those weights itself, so you never need to rebalance. Adding VAS, VGS or IVV to it doesn't diversify you further. It just raises your weighting to companies DHHF already owns.

How much ETF overlap is too much?

Overlap is when two of your ETFs own the same companies. Some is unavoidable and harmless. It becomes a problem when it quietly skews your portfolio towards a few holdings without you choosing that.

Take this five-ETF portfolio:

• DHHF (Australian and global shares)
• VAS (Australian shares, already about 37% of DHHF)
• IVV (the US S&P 500, already a large part of DHHF's US slice)
• VGS (developed markets, overlapping both DHHF and IVV)
• NDQ (the Nasdaq 100, mostly the same US tech giants as IVV)

It looks like five different investments. In practice, the largest US tech companies appear in four of them, and BHP and CBA, which alone are about 21% of VAS (Vanguard), appear in two. Each contribution also means five trades.

A simple test: list each ETF's top 10 holdings side by side. If a new ETF's top holdings are mostly companies you already own, it's adding concentration, not diversification. Add it only if that tilt is deliberate, for example a planned extra weighting to US tech.

The 1, 2 and 3 ETF portfolios

One ETF: maximum simplicity

Hold DHHF (0.19%, 100% shares) or VDHG (0.27%, about 90% shares and 10% bonds). One purchase per contribution, one tax statement, no rebalancing.

The cost is a slightly higher fee than building the same thing yourself, and no say in the country mix. This suits beginners, anyone investing smaller regular amounts, and anyone who'd rather not manage a portfolio. For the difference between the two, see DHHF vs VDHG.

Two ETFs: control at a lower fee

An Australian shares ETF plus a global one is the most common DIY setup. Blended fees at a 30% Australian / 70% global split:

Thirty per cent in Australia is far more than Australia's weight in world markets. It's a deliberate home bias that most Australian investors choose for franking credits and less currency exposure. You can pick a different split. That control is the point of holding two funds.

The trade-offs are two trades per contribution, two tax statements and occasional rebalancing. A two-ETF portfolio makes most sense once the fee saving over an all-in-one fund is worth that effort. On $100,000, the gap between DHHF (0.19%) and A200 + BGBL (about 0.07%) is about $120 a year. See the two-ETF portfolio guide.

Three ETFs: filling a specific gap

A third fund is worth adding only when it covers something the first two don't:

• Emerging markets: VGE (0.48%). VGS and BGBL hold developed markets only.
• Bonds: VAF (0.10%), if you want a defensive buffer.
• Small companies: VSO (0.30%), for a deliberate small-cap tilt.

A three-ETF portfolio needs disciplined rebalancing and three trades per contribution. It suits larger portfolios and investors with a clear view on what they want to add.

More than three: usually a mistake

A fourth ETF almost always overlaps with the first three. The reasonable exceptions are holdings that do a different job from shares: a cash ETF used as a holding account, or a gold ETF if you want a gold allocation (best gold ETFs).

Rebalancing: the hidden cost of more ETFs

An all-in-one ETF rebalances internally. A multi-ETF portfolio drifts: if Australian shares outperform, your Australian slice grows past its target. You can fix this two ways:

• Direct new contributions to the underweight ETF. This triggers no capital gains tax and works for most people who invest regularly.
• Sell the overweight ETF and buy the underweight one. This is faster but realises a capital gain, taxed in that year.

More on timing and thresholds: rebalancing an ETF portfolio.

Frequently asked questions

Related calculators and guides

• ETF Calculator — compare how blended fees compound
• Two-ETF portfolio: VAS + VGS or A200 + BGBL?
• DHHF vs VDHG
• BGBL vs VGS
• ETF vs shares
• ETF investing for beginners: how to buy your first ETF

This article is for general information only and does not constitute financial, tax or legal advice. Individual circumstances vary. Consult a registered tax agent or licensed financial adviser before making decisions based on this information.