The US stock market dominates the investing universe and has consistently outperformed other geographic markets since the financial crisis of 2008-10. In 2007, the US stock market accounted for under 30% of the world’s total market capitalization; in 2025, this now stands at over 50%. In addition, many of the hottest investment themes, such as AI, are heavily concentrated in US stocks.

The US market is also one of the most accessible global markets with numerous high-quality brokers such as Schwab, IBKR, and Robinhood serving the market, a large number of institutional analysts covering individual stocks, and several dedicated data vendors such as FirstRate Data and QuantQuote.

As such, the US market offers New Zealand investors opportunities not easily found in the domestic market. However, cross-border investing comes with important tax, regulatory, and practical considerations that investors need to be aware of.

Tax Implications for New Zealand Residents

The tax treatment for foreign stock investments depends on the investment approach and the size of the investor’s portfolio.

Fair Dividend Rate (FDR) vs Portfolio Investment Entity (PIE)

Most New Zealand residents investing directly in US stocks (by purchasing individual stocks/ETFs) will be subject to the Fair Dividend Rate (FDR) tax regime if the total value of the portfolio of overseas shares exceeds NZ$50,000. Per FDR:

• Tax is assessed on 5% of the opening value of the overseas stocks per year, irrespective of dividends or capital losses or gains.
• The tax is calculated at the resident’s marginal tax rate (which ranges from 10.5% to 39%)
• Dividends or capital gains are ignored for taxation purposes

Portfolio Investment Entity (PIE) Investing via a PIE fund (such as a managed fund or an active ETF) has the tax advantage of the marginal tax rate being capped at 28% (versus a max of 39% under FDR). In addition, there is no administrative overhead of calculating the opening valuations of stocks.

US Withholding Tax

The US levies a flat 30% withholding tax on all dividends paid to foreign investors. However, as New Zealand has a tax treaty with the US, this is reduced to 15% for individual investors (although there is some admin overhead as the investor will have to file an annual Form W-8BEN).

Tax Planning

To minimize the tax burden on a portfolio, some basic tax planning is essential, namely :

• Do not exceed the $50,000 threshold: If the total overseas investment portfolio stays NZ$50,000, only dividends received are taxed
• Consider PIE funds: For larger investments, PIE funds typically provide better after-tax returns
• Timing: FDR is calculated on April 1, so strategic timing of purchases and sales can reduce the tax liability. Most importantly, timing new purchases until after the April 1 watershed can shelter one year of stock ownership from taxation.

Currency Considerations

As US stocks are all denominated in US Dollars, investing in the US market exposes New Zealand investors to the additional risk in the form of FX risk. A deterioration in the NZD/USD exchange rate can significantly impact the NZD-converted portfolio returns.

There are several strategies and approaches to this risk. Firstly, if the investor has natural USD exposure anyway (such as USD expenses for travel or education), then the investor has a natural hedge in that FX losses in the portfolio would be offset by a reduced USD expense.

Investors can also select funds with currency hedges embedded in the fund structure - these are usually hedged against a basket of currencies and not a single currency, such as NZD, so there would likely be some residual risk. 

Additionally, investors could consider the exchange rate when timing their purchases and dollar-cost average in terms of the exchange rate, which would entail accelerating purchases of stock during periods of NZD weakness.

Regulatory Environment

New Zealand's regulatory framework is broadly supportive of overseas investing; however, there are still some regulatory issues investors should be aware of. Namely:

• Financial Markets Authority (FMA): This body regulates local investment platforms and may require additional documentation for overseas investments (such as dividend return documentation which brokers do not always supply as part of their services agreement).
• Anti-money laundering requirements: May affect account opening procedures, and may also impact the ongoing availability of the account as it is quite common for an account to be flagged by either a local or foreign regulatory body for investigation or additional compliance documents. 
• Tax reporting obligations: Ensure compliance with IRD requirements

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