Irish ETFs: 15% Instead of 30% Withholding
July 29, 2026
5 min read
- Funds domiciled in Ireland pay 15% instead of 30% withholding tax on US dividends. The basis is the double taxation treaty between Ireland and the United States.
- Because US equities dominate any world index, that is worth roughly 0.15% to 0.19% of return a year — often more than the entire fee gap between two providers.
- This number appears on no fee table. It works inside the fund, before any return is even reported.
Two ETFs on the same index, same TER, same size — and still different returns. The reason sits in the prospectus under "domicile".
Fees get discussed endlessly. Fund domicile almost never does. Yet this single detail determines a return difference of the same magnitude as the entire cost debate between a cheap and a very cheap provider.
01How dividend withholding tax works
When a US company pays a dividend to a foreign recipient, the United States retains part of it at source. The statutory standard rate is 30%. That deduction happens before the money reaches the recipient — in this case, your fund.
Whether the full rate or a reduced one applies depends on whether a double taxation treaty exists between the US and the recipient's country of domicile. Ireland has one. For funds domiciled in Ireland, the rate on US dividends therefore falls to 15%.
The half of the withholding tax saved do not flow back to you. They simply stay in the fund's assets instead of going to the US treasury — increasing the value of your units.
How this differs from the withholding tax you know: on Swiss dividends you can reclaim the withholding tax through your tax return. US withholding tax incurred inside a fund cannot be reclaimed. It is lost at fund level — unless the domicile prevents it from arising in the first place.
02How much it amounts to
The magnitude follows from three inputs: the index's US weighting, the dividend yield of those shares, and the 15-percentage-point difference in tax rates.
| US weight in index | Dividend yield | Effect per year |
|---|---|---|
| 65% | 2.00% | 0.195% |
| 70% | 1.80% | 0.189% |
| 72% | 1.60% | 0.173% |
So depending on market conditions the effect sits at roughly 0.17% to 0.20% a year. That sounds small. For context: it is about the same as the fee gap between the cheapest and a mid-priced Swiss provider.
Over 30 years: at CHF 500 a month and a 7% gross return, an effective drag of 0.45% produces roughly CHF 558,000. Add 0.19% of withholding disadvantage and it becomes roughly CHF 538,000. A difference of around CHF 20,000, created by fund domicile alone.
03Why Ireland and not Luxembourg
The two large European fund centres are Ireland and Luxembourg. For funds with a high US equity share, Ireland generally has the advantage, because the Irish-American treaty enables the reduction to 15% and Irish fund structures have become established for processing US income.
How do you identify the domicile? Most reliably from the ISIN: Irish funds begin with "IE", Luxembourg funds with "LU". The factsheet also states the domicile explicitly.
A practical example: the developed markets block of the arvy ETF Savings Plan carries an ISIN beginning with "IE" — for exactly this reason. Which fund that is and what it costs is set out on The Building Blocks.
An important qualification: this argument applies to funds with a high US equity share. For a bond fund denominated in Swiss francs, US withholding tax is irrelevant — there a Swiss fund domicile is usually the better choice, because what matters is withholding tax on domestic income. Domicile is not a quality seal; it has to fit the investment universe.
One point of context: for a private investor resident in Switzerland, domicile is a question of fund efficiency, not of your own tax liability. Your personal taxation follows Swiss law — more on that in ETF Savings Plan Tax in Switzerland.
04What the effect is not
Three clarifications, so no false expectations arise.
It is not a tax saving for you personally. The advantage arises inside the fund, not on your tax return. You notice it only indirectly, through slightly better performance.
It is not a fixed number. The effect moves with the index's US weighting and the prevailing dividend yield. If prices rise faster than dividends, it shrinks.
It does not replace a fee comparison. An Irish-domiciled fund with a high TER can be more expensive than a cheap fund domiciled elsewhere. Both figures belong together — the full breakdown is in The True Cost of Investing.
05Frequently asked questions
Why do Irish funds pay less US withholding tax?
Because a double taxation treaty between Ireland and the United States reduces the dividend rate for qualifying funds from 30% to 15%. The fund's domicile determines which rate applies.
Can I reclaim US withholding tax?
Withholding tax incurred at fund level cannot be reclaimed by you as an investor. It has already been deducted before the income reaches the fund. Domicile is therefore the only effective lever.
How do I tell where an ETF is domiciled?
From the ISIN: Irish funds begin with "IE", Luxembourg funds with "LU". The domicile is also stated in the factsheet and the prospectus.
Does the advantage apply to non-US shares too?
Other countries have their own rates and treaties, but the effect is far smaller there because their weight in a world index is lower. The practical significance comes almost entirely from the high US share.
Is this relevant for Swiss investors at all?
Yes. The effect applies regardless of where you live, because it arises inside the fund. Your personal tax situation in Switzerland is unaffected by it.
What is the DA-1 form?
Swiss taxpayers use DA-1 to reclaim creditable foreign withholding tax on directly held securities. It does not apply to withholding tax incurred inside a fund — which is why fund domicile is the only lever there.
Does the advantage apply to synthetic replication?
Synthetically replicating funds track the index via a swap, which changes how withholding tax arises. For physically replicating funds with a high US share, Irish domicile is clearly the norm.
How can I see a fund's withholding tax burden?
It is rarely disclosed directly. It becomes visible indirectly through tracking difference: two funds on the same index with the same TER but different domiciles will differ over time by roughly this amount.
06Keep reading
Overview
Costs, domicile, taxes and mechanics in one place.
Tax
Wealth tax, income taxation and how to declare it in practice.
Built on Irish fund structures
The arvy ETF Savings Plan accounts for domicile from day one — 0.39% management plus 0.06% TER.
This article was written by Thierry Borgeat, co-founder of arvy, and reviewed by Patrick Rissi, CFA, and Florian Jauch, CFA.
Disclaimer: arvy AG is a manager of collective assets authorised by the Swiss Financial Market Supervisory Authority FINMA under Art. 24 of the Collective Investment Schemes Act (CISA). This article is for information purposes only and constitutes neither investment advice nor tax or legal advice, nor an offer or solicitation to buy or sell financial instruments. The calculations shown are model calculations based on the stated assumptions and are not forecasts; they assume a constant return compounded monthly at the stated nominal annual rate. Past performance is not a reliable indicator of future results. Equity investments are subject to price fluctuations; losses up to the total loss of the capital invested are possible. Tax consequences differ by canton and by individual situation — please clarify yours with a professional.
