The Most Dangerous Tax for Foreign Investors in US Stocks: The USD 60,000 Estate Tax Threshold

Suppose you hold USD 500,000 in US stocks and die unexpectedly. Most people assume the portfolio passes straight to their family. The actual sequence is different: the broker freezes the account, your heirs must file a US estate tax return with the IRS (Form 706-NA) and obtain a transfer certificate (Form 5173) before they can touch the assets. If the entire position is in US individual stocks and US-listed ETFs, the tax comes to roughly USD 142,800, nearly 30% of the portfolio.

This is the US estate tax. If you are a nonresident alien (an NRA: not a US citizen and not domiciled in the US), your exemption is USD 60,000. That number is not indexed for inflation and has not moved in decades. A small group of countries has US estate tax treaties that can improve this position; Taiwan is not one of them, and this article assumes no treaty applies. If you live in a treaty jurisdiction, check the treaty before anything else. This article covers what gets taxed, how the tax is actually computed, and the legal planning routes.

The brutal comparison: USD 15M vs USD 60k

A 250x gap. And clear away the key misconception first: this has nothing to do with which broker you use. Whether you buy through a sub-brokerage account in your home country or directly through a US brokerage, the tax turns on whether the asset itself is a US-situs asset. A US stock is a US stock, regardless of which account holds it.

Which assets are US-situs

Taxable (US-situs)

• Shares of US corporations: AAPL, MSFT, NVDA, every US-incorporated company
• US-listed, US-registered ETFs: SPY, QQQ, VTI, VOO, all of them (an ETF share is a share of a US-registered fund)
• US corporate bonds, US REITs
• US-registered mutual funds

Not taxable (non-US-situs or statutorily exempt)

• Directly held US Treasuries (T-Bills, T-Notes, T-Bonds): statutorily exempt, one of the few estate-tax-friendly instruments in asset allocation. Note the words "directly held": wrap them in a US-listed ETF and the exemption is gone. See the companion piece (in Chinese).
• ADRs of foreign companies: the test is the issuer. The issuer of the TSM ADR is TSMC, a Taiwan company, so under the prevailing view it is not US-situs. See the TSM ADR article.
• Irish-domiciled UCITS ETFs: VWRA, CSPX and the like. The fund is registered in Ireland, so even if it holds nothing but US stocks, the fund share itself is an Irish asset.
• Non-US-listed foreign ETFs (for example, the Hong Kong-listed 2800).

The correct computation (where most articles get it wrong)

The common mistake is "subtract USD 60,000 first, then apply the rate." The statute actually works like this: apply the progressive rate schedule (18% to 40%) to the entire US-situs taxable estate to get a tentative tax, then subtract a unified credit of USD 13,000 (IRC §2102). The "USD 60,000 exemption" framing exists because a USD 13,000 credit exactly offsets the tax on a USD 60,000 estate. The two framings are equivalent only when the estate is exactly 60k; the larger the estate, the wider the gap.

Case 1: everything in US assets (hypothetical)

Portfolio: USD 500,000 (US individual stocks + US-listed ETFs, all US-situs)

Step 1  Apply the progressive schedule to the full 500,000
        = 70,800 + 34% × (500,000 − 250,000)
        = 70,800 + 85,000 = USD 155,800
Step 2  Subtract the unified credit of 13,000
        = 155,800 − 13,000 = USD 142,800

Effective burden: 142,800 / 500,000 = 28.6%
What the family actually receives: USD 357,200

Case 2: same USD 500,000, different structure (hypothetical)

Portfolio: USD 100,000 US individual stocks (US-situs)
           USD 100,000 Irish UCITS ETF (non-US-situs)
           USD 100,000 directly held US Treasuries (statutorily exempt)
           USD 100,000 Taiwan-listed ETF (non-US-situs; substitute your home-market fund)
           USD 100,000 Hong Kong-listed ETF (non-US-situs)

US-situs estate: USD 100,000
Step 1  Rate schedule: USD 23,800
Step 2  Subtract credit of 13,000 = USD 10,800

What the family actually receives: USD 489,200
Difference vs Case 1: USD 132,000

Three legal planning routes

1. Replace US-listed ETFs with Irish-domiciled UCITS ETFs. VWRA instead of VT, CSPX instead of SPY. There is a dividend withholding bonus: an Irish fund receiving US dividends qualifies for the 15% rate under the US-Ireland treaty, while a Taiwan investor holding US stocks directly is withheld at 30% (investors in other non-treaty countries face the same 30%; treaty-country residents should check their own rate). The trade-offs are thinner liquidity and the fact that some brokers do not carry them.
2. Allocate to directly held US Treasuries. Move cash and bond sleeves into directly held T-Bills and T-Notes: exempt from estate tax, and the interest is also free of US withholding for foreign investors (the portfolio interest exemption).
3. Consider structured holding for large positions. Above roughly USD 500k, insurance or trust structures start to make economic sense, but setup and maintenance costs are high. Get a full assessment from a professional; this is not a DIY project.

Self-check list

• Do your US individual stocks plus US-listed ETFs exceed USD 60,000 in total?
• Does your family know where the accounts are, and that a freeze-and-filing process is coming?
• Do you know who could handle Form 706-NA for your family? (Most local accountants have never filed one; you need a US tax practitioner who knows NRA estate tax.)
• In your bond and cash sleeves, are you actually using the directly-held-Treasuries exemption?