Total Cost Of Owning A US ETF Calculator NZ 2026/27
United States exchange traded funds are shopped on their expense ratio, and for a New Zealand investor the expense ratio is close to irrelevant. It is the only one of five costs that the fund itself charges. The platform charges you to convert New Zealand dollars into United States dollars. The broker charges you to trade. The United States withholds tax on the dividends before they reach you. And once the total cost of your offshore shares passes fifty thousand dollars, Inland Revenue taxes you on five percent of the value every year under the foreign investment fund rules, regardless of what the fund actually returned. That last item alone is usually many times the fund fee. This page adds all five together and reports one annual figure, expressed both in dollars and as a percentage of the holding, with each component shown as a share of the total so it is obvious where the money goes. It handles the foreign exchange charge correctly by spreading a one-off conversion cost across the years you intend to hold, which means a short holding period makes the same fee far more expensive. It applies the right tax treatment on each side of the de minimis threshold, taxing actual dividends below it and applying the fair dividend rate above it without double counting the dividends, which is a mistake simpler tools make. And it shows the threshold for what it is, a cliff rather than a slope, where one extra dollar of cost can change the annual bill by several hundred.
Brokerage = trades a year × cost per trade.
Fund expense ratio = holding × the fund's stated ratio.
US dividend withholding = dividends × the withholding rate. 15% with a W-8BEN under the United States and New Zealand treaty, 30% without one. Deducted at source before the dividend reaches you.
FIF de minimis: NZ$50,000 of total cost across all offshore shares. At or below it the rules do not apply.
Above the threshold, the fair dividend rate applies: tax = holding × 5% × your marginal rate. Actual dividends are not separately taxed on top, because the deemed 5% replaces them.
At or below the threshold, the actual dividends are taxable at your marginal rate, with a credit for the tax withheld capped at the New Zealand tax on that income.
Withholding tax is counted as a cost even under the fair dividend rate. Whether a foreign tax credit is available in that situation is complex and this page does not assume relief, which makes the figure conservative rather than optimistic.
Excluded: the comparative value method, which individuals may use instead of the fair dividend rate where it produces a lower result; the exit cost of converting back to New Zealand dollars; bid-ask spreads; and any platform or custody fee.
Not tax advice. Last verified: August 2026 against ird.govt.nz and irs.gov treaty documents.
Every cost, added up
| Cost | Charged by | Rate | A year | Share of total |
|---|---|---|---|---|
| FIF tax, fair dividend rate | Inland Revenue | 1.650% | $990.00 | 82.71% |
| US dividend withholding | United States | 0.195% | $117.00 | 9.77% |
| Fund expense ratio | The fund | 0.090% | $54.00 | 4.51% |
| Foreign exchange, spread over 10 years | The platform | 0.060% | $36.00 | 3.01% |
| Brokerage | The broker | 0.000% | $0.00 | 0.00% |
| Total cost of ownership | 1.995% | $1,197.00 | 100.00% |
Four of the five costs are charged by someone other than the fund, which is why the expense ratio tells you so little on its own.
What the FIF threshold does
| At or below $50,000 | Above $50,000 | |
|---|---|---|
| How you are taxed | Actual dividends | 5% of value, deemed |
| Foreign exchange and brokerage | $36.00 | $36.00 |
| Fund expense ratio | $54.00 | $54.00 |
| US withholding | $117.00 | $117.00 |
| NZ tax | $140.40 | $990.00 |
| Total a year | $347.40 | $1,197.00 |
| Difference | $849.60 |
Same holding, same fund, same everything. The only difference is which side of the threshold your total offshore cost sits on.
The cliff, by total offshore cost
| Total cost of offshore shares | Treatment | Cost a year | As a percentage | vs the row above |
|---|---|---|---|---|
| $25,000.00 | Exempt | $144.75 | 0.579% | |
| $45,000.00 | Exempt | $260.55 | 0.579% | $115.80 |
| $50,000.00 | Exempt | $289.50 | 0.579% | $28.95 |
| $50,001.00 | FIF applies | $997.52 | 1.995% | $708.02 |
| $60,000.00 | FIF applies | $1,197.00 | 1.995% | $199.48 |
| $100,000.00 | FIF applies | $1,995.00 | 1.995% | $798.00 |
One dollar of extra cost between the third and fourth rows adds $708.02 to the annual bill. This assumes the holding equals the total offshore cost.
Four Of The Five Costs Are Not The Fund's
An expense ratio is what the fund charges. It says nothing about what the platform, the broker, the United States and Inland Revenue take on the way through.
On the worked example the fund charges $54.00 and everyone else charges $1,143.00. Shopping on the expense ratio compares 4.51% of the cost and ignores the rest.
Worked Example: $60,000 In A 0.09% Fund
FIF tax, $990.00. Above the de minimis threshold the fair dividend rate treats you as earning 5% of the value, taxed at your 33% marginal rate. That is 1.65% of the holding whatever the fund returns.
US withholding, $117.00. 15% of $780.00 of dividends, deducted before the money reaches you.
Expense ratio, $54.00. The only cost most people look at.
Foreign exchange, $36.00. A 0.60% conversion charge on $60,000.00 is $360.00 once, spread across ten years.
Total $1,197.00, or 1.995% a year, which is 22.2x the expense ratio.
The Threshold Is A Cliff, Not A Slope
If the total cost of all your offshore shares is $50,000.00 or less, the foreign investment fund rules do not apply and you are taxed on the actual dividends. Above it they apply to everything you hold, not just the amount over.
A portfolio costing $50,000.00 pays $289.50 a year. One costing $50,001.00 pays $997.52. One extra dollar adds $708.02.
Two details catch people out. It is measured on original cost, not current value, so a holding that has grown a long way can still be under. And it counts every offshore holding together, so a small position in one fund can push a larger one over. Our FIF de minimis calculator works out exactly where you sit.
Dividends Are Not Taxed Twice
A mistake worth avoiding: under the fair dividend rate, the actual dividends are not separately taxable in New Zealand. The deemed 5% replaces them.
Simpler calculators add dividend income on top of the 5% deemed income and substantially overstate the tax. This page does not, which is why the New Zealand tax line above the threshold is exactly 5% of value at your marginal rate and nothing else.
The United States withholding still applies, because that is deducted at source before New Zealand's rules touch it. Whether a credit for it is available under the fair dividend rate is a complex question, and this page counts it as a cost rather than assuming relief, which makes the total conservative.
The Holding Period Changes The FX Cost
Converting currency is a one-off charge, so what matters is how many years you spread it across.
On the worked example a 0.60% fee is $360.00 once, or $36.00 a year over ten years. Hold for two years instead and the same fee costs $180.00 a year.
That is the real argument against moving in and out of foreign holdings, and it is separate from the exit conversion, which our repatriation cost calculator covers. Our US share FX cost calculator deals with the entry charge in detail, and our FX spread vs fee calculator covers the part hidden in the exchange rate rather than shown as a fee.
Compare This Against A New Zealand Fund
The obvious comparison is a New Zealand domiciled fund holding the same foreign shares. It is taxed under the same fair dividend rate, but at your prescribed investor rate, capped at 28%, rather than your marginal rate which reaches 39%.
It also removes the currency conversion and the brokerage entirely, since you buy it in New Zealand dollars.
Against that it carries its own fee, which is usually higher than a large United States fund's expense ratio. Whether it wins depends on your marginal rate and how much you are investing, and the only way to settle it is on total cost of ownership. That is what this page produces, and it is the figure to carry into the comparison rather than the expense ratio.
Our US withholding tax on dividends calculator covers the withholding side properly, including the marginal-rate interaction that makes the W-8BEN worth less than it first appears.
Related NZ Offshore Investing Calculators
- FIF De Minimis Calculator: exactly where you sit against the threshold.
- US Share FX Cost Calculator: the entry conversion in detail.
- US Withholding Tax Calculator: what the W-8BEN is really worth.
- FIF Calculator, FDR Method: the fair dividend rate worked through.
- Currency Hedged vs Unhedged Calculator: the exchange rate risk on top of the cost.