New to the UCITS vs US-domiciled question? Read The Invisible Tax Non-US Expats Pay to the IRS first for the full framing, then come back here to run your own numbers.
UCITS Withholding-Tax Drag Calculator#
Your residency drives what tax rate the US applies to dividends you receive directly. It barely changes what an Irish UCITS costs you, because that tax is captured at the fund level via the US-Ireland treaty. That asymmetry is the whole point of this calculator.
Total return, not just dividend yield. WHT applies only to the dividend portion, but the drag compounds against a total-return portfolio. The default 7% is a global-equity long-run baseline before inflation.
| Holding | WHT rate | Annual drag | Lost this year |
|---|---|---|---|
| Total | - | - | - |
This is the money the US Treasury (and, for some paths, other tax authorities) takes from you across the holding period, priced in your portfolio's currency. Same portfolio, same return, held via the tax-optimal path instead, would end up worth this much more.
Treaty rates require a valid W-8BEN on file with your broker. Without one, the US withholds the statutory 30% regardless of your country's treaty rate. Check your broker's tax-forms section before assuming your treaty rate is live. Rates in this calculator are US-source dividend withholding rates that apply either at the fund level (for Irish UCITS PLC/ICAV structures) or at the investor level (for direct US-ETF and single-stock holdings), sourced from the US bilateral tax treaties in force. The v1 model assumes US-equity funds; global UCITS like VWRA face a weighted blend of source-country rates and the blended fund-level drag is closer to 8-11% than a flat 15%. Your country of residence may also tax the distribution or capital gain on top (UK reporting-fund status, German InvStG, Australian attribution rules can be material); that layer is not modeled here. Treat this as a structural cost comparison, not a full after-tax return model. Not tax advice.
Treaty rates as of 2026-07. Last reviewed July 2026.
What This Calculator Actually Measures#
Two structural costs a non-US expat pays for holding the wrong ETF wrapper:
- US dividend withholding tax. Charged either at the fund level (for Irish UCITS, 15% flat via the US-Ireland treaty) or at the investor level (for direct US-domiciled ETFs, at whatever rate the US-your-country treaty says).
- US estate tax on US-situs assets. 40% on value above a $60,000 exemption, for any non-US person holding US-domiciled ETFs. Irish UCITS are not US-situs, so switching wrappers eliminates the exposure entirely.
For most non-US expats, the estate-tax layer is the bigger number. The dividend drag is the visible tax. The estate exposure is the tax nobody warned you about.
A Worked Example#
Say you are a UAE resident with $250,000 of savings, and you hold it in a mix that many non-US expats end up in by default:
- $150,000 in VOO (US-domiciled S&P 500 ETF)
- $80,000 in CSPX (Ireland-domiciled S&P 500 UCITS)
- $20,000 in single US stocks
The UAE has no tax treaty with the US, so US withholding on the VOO and single-stock portions is the full 30%. On CSPX, the US withholds 15% at the fund level.
- Weighted current-year WHT: roughly 24% of the dividend slice.
- Annual dollar cost: about $780 in year one (assuming a blended 1.5% yield).
- 30-year compounded cost of the wedge: roughly $32,000 in terminal wealth lost to the wrapper choice on the US-ETF portion, at a 7% total return.
- Estate-tax exposure at year 30: on $170,000 of US-situs holdings that grow to about $1,300,000, your heirs face a bill of approximately $452,800 to the IRS under the graduated schedule (18-40% brackets minus the $13,000 unified credit), if you die holding them in US-domiciled form.
The dividend drag over 30 years is around $32,000. The estate-tax exposure is around $452,800. That is the ratio, and it is why sophisticated non-US expats move the ETF sleeve to UCITS. Note the switch removes the ETF exposure, not any residual US-brokerage cash, US single stocks, or old US IRA/401(k) balances. Those remain US-situs on their own.
How to Read Your Results#
| Result | What it means |
|---|---|
| Weighted WHT rate | The blended US withholding rate across your portfolio's dividend slice |
| Annual drag (bps) | Basis points of portfolio value lost per year to withholding |
| Terminal wealth lost | Compounded dollar cost of the drag over your holding period |
| UCITS switching saving | What you would keep by holding the Irish equivalent |
| Estate-tax exposure | Potential IRS bill on US-situs assets above the $60k exemption |
The residency dropdown changes the US-ETF column (via treaty rates) but not the UCITS column (which is a constant 15% at fund level). That asymmetry is the whole point of the tool.
This is a structural cost comparison, not a full after-tax return model. Your country of residence may also tax the distribution or the capital gain, and those layers depend on whether the fund is accumulating or distributing and whether it is reporting or non-reporting in your jurisdiction. Consult a cross-border tax adviser for a full picture.
Related Calculators#
More tools for globally mobile investors:
- Currency-Aware FIRE Calculator - see your FIRE number in both the currency you earn in and the one you will retire in
- FIRE Calculator - the single-currency starting point
- Safe Withdrawal Rate Calculator - stress-test your withdrawal rate against history
Go deeper: The Invisible Tax Non-US Expats Pay to the IRS - the full story on why the US takes 15-30% of your dividends before they leave the country and what to do about it.
