Interactive Brokers (IBKR) is one of the world’s largest online brokers and is accessible to New Zealand investors. It offers some of the lowest US share brokerage and by far the lowest currency conversion cost of any platform available in NZ. Its platform is more complex than NZ app-based platforms, and its best-known “$0 commission” tier isn’t available to NZ residents.
Interactive Brokers is the lowest-cost broker for large US share portfolios in this comparison, but NZ residents can only open an IBKR Pro account (IBKR Lite's zero-commission tier is US-resident only). IBKR Pro still charges very little: as low as USD $0.35–$1 per order, plus an IdealPro FX margin of roughly 0.002% (with a USD $2 minimum), far cheaper than any other NZ-accessible platform. It requires setup complexity, is not intuitive for beginners, and FIF tax still applies above $50,000 NZD. The FX savings become meaningful on US portfolios of $30,000+, and it also offers options, margin, and global market access.
Interactive Brokers Overview
| Feature | Details |
|---|---|
| Headquarters | Greenwich, Connecticut, USA |
| NZ availability | Yes — NZ residents can open accounts, on IBKR Pro only |
| Account types | IBKR Lite (US residents only — not available to NZ clients), IBKR Pro (commission-based, available to NZ residents) |
| Regulation | FINRA/SEC (US), FCA (UK), accessible from NZ |
| NZ FMA regulation | Not directly regulated in NZ |
| Minimum deposit | $0 for a cash account; ~USD $2,000 typically expected for a margin account |
| Currency | Multi-currency — hold NZD, USD, AUD, etc. |
| US brokerage (IBKR Lite) | Not available to NZ residents |
| US brokerage (IBKR Pro) | Fixed: USD $0.005/share (min $1/order); Tiered: USD $0.0035/share (min $0.35/order) |
| FX rate | ~0.002% (0.20 basis points) via IdealPro, min USD $2 per order — the lowest of any NZ-accessible platform |
| Annual maintenance fee | None (inactivity fee removed in July 2021) |
Fee Comparison: IBKR vs Alternatives
On a $50,000 NZD US share portfolio, single annual purchase (~USD $28,500 at an illustrative 0.57 rate), with no ongoing platform fee on any of these platforms (sorted by total year-1 cost, lowest first):
| Platform | FX cost | Brokerage | Total year 1 |
|---|---|---|---|
| IBKR (Pro) | ~$4 (0.002% via IdealPro, $2 USD min) | ~$2 (USD $1 min, fixed plan) | ~$6 |
| Tiger Brokers | ~$175 (0.35%) | ~$4 (USD $2 flat, up to 200 shares) | ~$179 |
| Hatch | ~$250 (0.5%) | ~$5 (USD $3 flat) | ~$255 |
| Sharesies | ~$250 (0.5%) | ~$9 (1.9%, capped at USD $5) | ~$259 |
| Stake | ~$500 (1%, min $2) | ~$5 (USD $3 flat) | ~$505 |
IBKR’s IdealPro FX rate (~0.002%, i.e. 0.20 basis points) is dramatically cheaper than any other platform’s FX fee available to NZ retail investors — roughly 150–500x lower than the 0.35%–1% charged elsewhere. This advantage compounds significantly on larger or more frequent transactions. Note IBKR Pro’s per-share brokerage means very large share-count orders cost proportionally more than this example, though it’s still capped relative to Sharesies’ percentage-based fee once order sizes grow.
IBKR Lite vs IBKR Pro
IBKR Lite ($0 commission on US stocks and ETFs, funded by payment for order flow) exists, but it’s only offered to US-resident clients — NZ residents cannot open an IBKR Lite account. Any NZ investor signing up will be opening an IBKR Pro account by default.
IBKR Pro (the only option for NZ residents):
- Fixed pricing: USD $0.005/share, minimum $1 per order
- Tiered pricing: USD $0.0035/share, minimum $0.35 per order (scales down further with higher monthly volume)
- Best execution (direct market access)
- Access to options, futures, margin
- Despite the “Pro” name, the fixed plan is simple enough for buy-and-hold investors — the commission on a typical few-hundred-dollar ETF order is usually just the $1 (fixed) or $0.35 (tiered) minimum
For NZ residents, IBKR Pro (fixed or tiered pricing) is the only account type available, since Lite isn’t an option.
Currency Conversion: The Key Advantage
IBKR’s currency conversion through IdealPro (its internal FX marketplace) offers rates extremely close to the interbank rate — a commission of 0.20 basis points (0.002%) of the transaction value, with a USD $2 minimum per order. This is not a typo: it’s roughly two orders of magnitude cheaper than the 0.35%–1% FX fees charged by Tiger Brokers, Hatch, Sharesies, and Stake.
Practical process for NZ investors:
- Deposit NZD from your NZ bank account (SWIFT transfer, $15–$20 bank fee usually)
- In IBKR, convert NZD to USD via IdealPro (FX commission ~0.002%, $2 USD minimum)
- Buy US shares or ETFs
- To withdraw: sell, convert USD→NZD, SWIFT back to NZ bank
This adds 2–4 business days of settlement and a bank transfer fee each direction. The FX saving is largest on large, infrequent conversions; on small regular amounts, the bank fee and admin can outweigh it.
Tax Reporting
Annual tax reporting: IBKR generates a comprehensive tax report (Activity Statement). You’ll need this for your FIF tax calculation and IR3.
FIF Tax on IBKR Holdings
IBKR holdings of US shares are subject to FIF tax once your total overseas share portfolio exceeds NZD $50,000 cost price. This applies regardless of whether you hold VOO at Hatch, Stake, or IBKR — the platform doesn’t change the tax treatment.
At FDR (Fair Dividend Rate): 5% × opening NZD value × marginal tax rate annually.
For an investor at 33% marginal rate with a $200,000 US share portfolio: FIF tax ≈ $200,000 × 5% × 33% = $3,300/year — regardless of actual market performance.
This is why many larger NZ investors use IBKR for the portfolio component below the FIF threshold, and NZ PIE managed funds above it.
→ See: FIF Tax NZ — Full Guide
What NZ Investors Can Buy on IBKR
- US ETFs: VOO, VTI, VT, VXUS, QQQ, SCHD, and all major US ETFs
- US shares: Any NYSE/NASDAQ/AMEX listed stock
- Options: US listed options (for sophisticated investors)
- Bonds: US treasuries and corporate bonds
- International shares: UK, European, Australian, Hong Kong, and many more markets
- Futures and margin: For professional investors
- NZX shares: Not available through IBKR
IBKR’s Features and Limitations in NZ
Features:
- FX savings become meaningful on US portfolios of $30,000+
- Near-zero-cost FX and minimal per-order brokerage for frequent trading (IBKR Pro; the $0 Lite tier is US-resident only)
- US options, futures, and global market access
- A self-directed international platform
Limitations:
- The platform interface is complex
- No NZX shares or NZ managed funds
- SWIFT transfer fees erode the advantage on very small, frequent investments
- Requires managing SWIFT transfers and FIF tax reporting
IBKR vs Tiger Brokers for NZ Investors
Both offer very low FX rates and are the two cheapest options for US investing from NZ.
| Feature | IBKR (Pro — NZ residents’ only option) | Tiger Brokers |
|---|---|---|
| US brokerage | USD $0.35–$1 min per order (no $0 tier for NZ residents) | USD $2 flat (up to 200 shares) |
| FX rate | ~0.002% (min USD $2) | ~0.35% |
| NZX shares | ❌ No | ✅ Yes (0.3% combined, $4 min) |
| ASX shares | ❌ No (via CHESS) | ✅ Yes |
| NZ bank transfer | SWIFT (fee) | NZD direct deposit |
| Account setup | 15–30 min | 15–20 min |
For US investing, IBKR’s FX rate is dramatically lower, not just marginally, and its advantage grows with the size of each conversion. Tiger Brokers adds NZX/ASX access, NZD direct deposit, and a less complex platform. The trade-off is FX cost against complexity, and it shifts toward IBKR as the NZD amounts converted get larger.
→ See: Tiger Brokers NZ Review 2026
Where to check the latest data
Rates, fees and returns change often. Before deciding, check current figures yourself:
- Sorted Smart Investor: compares fees, returns and risk levels of KiwiSaver and managed funds.
- Disclose register: holds each fund's product disclosure statement and quarterly fund updates.
- Financial Service Providers Register: shows whether a provider is registered to offer financial services in New Zealand.
- The provider's own website: has its current rates, fees and full terms; these change more often than any comparison page.
Frequently Asked Questions
Is Interactive Brokers safe for NZ investors? IBKR is one of the largest brokers in the world and is regulated by FINRA/SEC (US) and the FCA (UK), but not directly by the NZ FMA. US accounts have SIPC protection up to USD$500,000 for securities. Currency and FIF tax complexity are the other risks to weigh.
Can I use IBKR for NZ tax purposes? Yes. IBKR generates detailed activity statements for tax. You’ll need an accountant familiar with FIF tax to prepare your NZ IR3 correctly.
Does IBKR charge inactivity fees? IBKR removed the monthly minimum activity fee in 2021. There is now no inactivity fee.
How do NZ investors deposit NZD? By SWIFT wire transfer from an NZ bank. ANZ, ASB, BNZ, Westpac all support outward SWIFT. Expect $15–$25 per transfer, charged on each transfer regardless of size.