VOO vs VUAA for non-US investors

The two funds, side by side

Fund data as published by Vanguard and fund data providers in September 2026. Expense ratios, share classes and listings change — the factsheet is the authority, not this page.

Same index, same companies, same weights. Every difference between these two tickers is a wrapper difference, which is exactly what makes the comparison instructive.

Why the usual Irish-fund advantage disappears here

The standard case for an Irish wrapper over a US one rests on a sourcing asymmetry: a US fund's distribution to a non-US holder is withheld at your treaty rate on everything, while the Irish fund suffers US withholding only on the US slice of its dividends. For a global fund — VT against VWRA, say — that slice is well under half the total, and the Irish fund wins on withholding at most treaty rates.

An S&P 500 fund has no non-US slice. Its dividends are essentially 100% US-sourced. So the two wrappers are withholding on the same base:

• VOO is a US fund. It pays no US withholding on the dividends it receives, but its distribution to you is US-source income, withheld at your residence's rate from the IRS treaty table on the whole amount: 30% with no treaty, 15% for many treaty countries, 10% for a few residences, 0% for a couple.
• VUAA is an Irish fund. It suffers 15% US withholding inside the fund, under the US–Ireland treaty, on the dividends it receives. Ireland then withholds nothing from a non-resident holder — and because the share class accumulates, nothing is paid out to withhold from in the first place.

At a 15% treaty rate the two amounts are identical — the Irish fund just pays the tax one layer earlier. Below 15%, VOO pays less; above it, VUAA does. The withholding question collapses to a single comparison: your treaty rate against Ireland's fixed 15%. Everything else on this page — fees, credits, estate exposure, availability — is what decides the tie.

A worked example, with its assumptions in the open

$100,000 invested; gross dividend yield of the S&P 500 assumed at 1.3%, so $1,300 a year, all of it US-sourced. VUAA's column is always 15% of $1,300 — $195 — because the US–Ireland rate does not depend on where you live. VOO's column is your treaty rate applied to the same $1,300.

Now add the fee gap: 0.03% against 0.07% is four basis points — $40 a year on $100,000, in VOO's favour. At a 15% treaty rate, where the withholding is a dead heat, that $40 puts VOO ahead on total annual drag — the opposite of the global-fund result, and the number the usual advice misses. With no treaty, VUAA's ≈$195 withholding advantage comfortably outweighs the fee; at 10% or 0%, both effects point the same way and VOO wins on both. Find your residence's rate — it is a published number, not an estimate.

One asymmetry the table cannot show: where the tax is paid matters, not just how much. VOO's withholding is taken from a distribution paid to you, so a residence that taxes dividend income and grants foreign tax credits can often credit it against tax at home. The 15% suffered inside VUAA generally cannot be credited — you never paid it, the fund did, one layer down. In residences that tax dividends and grant credits, this tilts the comparison further towards VOO even where the headline amounts are equal.

Estate tax: the asymmetry that is not about percentages

VOO shares are US-situs assets. For a non-US, non-resident estate, US-situs assets above USD 60,000 can attract US estate tax at rates reaching 40% on the excess, unless an estate tax treaty raises that threshold — and the United States has estate treaties with only a limited number of countries. An Irish-domiciled UCITS such as VUAA is not a US-situs asset for this purpose.

This is the counterweight to everything above. VOO's $40-a-year fee advantage and a possible credit advantage are small, recurring and certain; the estate exposure is large, contingent and easy to forget about — a long-term S&P 500 investor crosses $60,000 in an ordinary month, with no notification from the broker. Whether it ever bites depends on how the assets are held and on the circumstances of an estate, which is not something any tracker can compute — but knowing which side of the line you are on is the point.

Accumulating is not automatically simpler

VUAA reinvests internally: no cash lands, nothing to re-buy, no drag from idle dividends, and — usefully for a contribution tracker — nothing that could be mistaken for a deposit. But several residences tax accumulating funds anyway, on a deemed or imputed basis rather than on cash received, and a few tax them less favourably than distributing ones. If a distributing Irish wrapper suits your residence better, the same fund offers one: VUSA/VUSD. VOO's quarterly distribution is visible, taxable in the ordinary way, and has to be reinvested by hand.

Which is better depends on the residence you actually have, not on which is tidier.

Whether you can buy either one

Availability decides this question more often than arithmetic does. Retail investors in the EEA and the UK generally cannot buy VOO, because US-domiciled ETFs do not publish the KID that PRIIPs requires; European brokers block the order rather than the regulator blocking the fund. Investors in most other jurisdictions can typically buy either through an international broker, subject to the broker's own rules.

If only one of them is purchasable where you are, the comparison is already settled, and the useful question becomes what the wrapper costs you per year — which is what the numbers above are for.

A third structure worth knowing exists

Some swap-based (synthetic) S&P 500 UCITS ETFs receive the gross total return of a qualified index — without US withholding suffered inside the fund at all. That can beat both wrappers on this page on withholding alone. The trade is structural: exposure through a swap counterparty rather than direct share ownership, with its own risks, mechanics and residence-specific tax treatment. This page does not compare specific synthetic funds; if the structure interests you, the factsheet — which discloses the replication method and counterparty arrangements — is where to start.

What to do once you have chosen

Both effects on this page are invisible on a brokerage statement. Fund-level withholding never appears anywhere — it is deducted before the fund is paid — and investor-level withholding shows up as a line you notice once and forget. BorderFolio estimates both steps per instrument, using the domicile of each fund you actually hold against the tax residence you configure, and keeps the estimate attached to your real dividend history rather than to a hypothetical portfolio. If you hold both wrappers, or you moved and now hold the wrong one for your new residence, that is precisely the case it is built for.

Limitations

• The example is an illustration, not your portfolio. The 1.3% yield is an assumption; the index's actual yield moves every year, and with it every dollar figure above.
• Treaty rates depend on paperwork. Without valid documentation on file the statutory 30% applies whatever the treaty table says.
• The second step is not modelled here. Tax where you live, credits and their caps, and the treatment of accumulating funds are all residence-specific — and the credit nuance above depends entirely on your home rules.
• Not advice. This is an informational comparison of two fund structures, not a recommendation to buy or sell either. See the investment & tax disclaimer.