US Estate Tax Risks for Non-US ETF Investors

The $60,000 Threshold Nobody Warns You About

US estate tax is usually discussed as an American's problem, governed by an exemption in the millions. For a non-US person it works very differently and far more harshly. A non-resident, non-citizen who dies owning US-situs assets is exposed to US federal estate tax on the value above roughly $60,000, at graduated rates that climb toward 40%. The generous multimillion-dollar exemption does not apply to you.

US-situs assets include US-domiciled ETFs and individual US stocks. So a non-US investor who has dutifully built a portfolio of VOO, VTI and a few US names may be sitting on a six-figure US estate-tax exposure they have never been told about. The tax is assessed on death, falls on the estate, and can entangle heirs in a US filing process at the worst possible time.

What Counts as a US-Situs Asset

The trigger is whether an asset is treated as situated in the US for estate-tax purposes. US-domiciled ETFs and shares in US corporations are US-situs and exposed. By contrast, a fund domiciled outside the US — an Irish UCITS fund, for example — is generally not a US-situs asset, even when it holds US stocks internally, because what you own is shares in an Irish fund rather than the US securities themselves.

This distinction is the whole game. It means a non-US investor can get full exposure to the US stock market through an Irish-domiciled UCITS fund without holding a US-situs asset, and therefore without the estate-tax exposure that the equivalent US-listed fund would carry. The underlying market exposure is the same; the estate-tax treatment is completely different, driven entirely by the fund's domicile.

• Exposed (US-situs): US-domiciled ETFs (VOO, VTI, QQQ), shares in US companies
• Generally not exposed: Irish-domiciled UCITS ETFs (CSPX, IWDA, VWCE), even when holding US stocks
• Check separately: US-situs treatment of cash, bonds and other holdings can differ

Treaties and Who Is Most at Risk

A minority of countries have estate- or gift-tax treaties with the United States that can raise the threshold or provide relief — residents of those countries may be in a stronger position. Most countries, however, have no such treaty, so for the typical non-US investor the harsh roughly $60,000 threshold applies in full. Whether your country has an estate-tax treaty is one of the most important facts to establish.

The investors most exposed are non-US persons with sizeable, US-heavy portfolios held directly in US-listed funds and stocks — precisely the people who followed US-focused investing advice without adjusting for their own status. A small position below the threshold may never trigger the tax, but a serious long-term portfolio will cross it, and the exposure grows silently as the portfolio compounds.

How Non-US Investors Reduce the Exposure

The cleanest structural fix is to hold US and global equity exposure through non-US-domiciled funds — typically Irish UCITS funds such as CSPX, IWDA or VWCE — so that what you own is a non-US-situs asset rather than US-listed securities. This single decision removes the estate-tax exposure for most ordinary investors while keeping the same market exposure, which is why it is the standard advice for non-US, non-treaty investors.

Larger or more complex estates sometimes use additional tools — holding US assets through a non-US holding company or trust, or coordinating with their home-country estate plan — but these add cost and complexity and need professional design. Estate-tax rules, thresholds and treaty positions can change, and the consequences of getting this wrong fall on your heirs, so confirm your exposure and the current rules with a cross-border estate-tax specialist.