Margin 101 | 03 Want to buy NVIDIA but only hold AUD — do you have to convert to USD first?
Many Australian investors hold mainly AUD in their accounts, while the names they follow — NVIDIA, Tesla, Apple and others — trade in USD.
In a cash account, a user generally needs to hold cash in the relevant currency first.A margin account supports multi-currency financing. Tiger currently supports AUD, USD, HKD and CNH financing; actual capacity and scope are subject to your account page and approval outcome.
Important: This material is provided for general educational and informational purposes only and does not constitute financial product advice, investment advice, or a recommendation. Margin lending, short selling, and other leveraged trading strategies involve significant risks and may not be suitable for all investors. Losses may exceed your initial investment. Before investing, consider whether the product is appropriate for your objectives, financial situation and needs, and read the relevant PDS and risk disclosures.
An example
Suppose an account holds:
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AUD 20,000
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USD cash balance of 0
The user now wants to buy a US stock. There are two ways to fund it:
Option 1: convert first
Convert AUD to USD → wait for the conversion and funds to settle → buy the US stock in USD
Option 2: borrow USD
Keep the AUD assets → use USD financing to complete the US trade → a USD margin balance is created
The second route removes the manual conversion step before each trade, but it is not free.
If you buy or sell overseas securities in a margin account using AUD without converting first, the system automatically creates a margin loan, secured against the assets in your account, and that loan accrues interest. So once you use USD financing:
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interest accrues on the USD margin actually drawn;
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AUD/USD moves may affect the account's overall risk — the Help Centre expressly warns that "movements in the AUD exchange rate and in the price of the underlying security may lead to a margin shortfall", so margin requirements need ongoing attention while you hold foreign-currency positions;
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you still have to decide whether to clear the USD debit balance by converting currency, depositing funds, or selling assets.
An easily overlooked feature: end-of-day currency conversion repayment
Tiger Brokers Australia (TBAU) offers margin account clients an "end-of-day currency conversion repayment" feature, which operates on the client's standing instruction: after the close of each trading day and before interest is accrued, the system assesses the account's funds and borrowings and, where applicable, converts settled available funds in other currencies into the borrowed currency to repay outstanding borrowings, reducing the interest accrued.
A few key rules:
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How to enable: clients can switch it on at any time via Tiger Trade → Portfolio → Convert → Set up Auto Conversion.
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Currency priority: where settled funds exist in multiple currencies, AUD is used first; if AUD is insufficient, the buying power of other currencies is calculated at the end-of-day live rate and used from highest to lowest. Where borrowings exist in multiple currencies, the repayment order is determined by TBAU at its sole discretion.
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Settled cash only: unsettled cash (for example, unsettled proceeds from closing a position) is not eligible.
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Fees: standard FX transaction fees may apply; the feature itself carries no additional charge. If you hold an FX-fee-waiver card, it can apply automatically.
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Execution not guaranteed: market volatility, system failures and other factors outside TBAU's control may cause delay, rejection, cancellation or non-execution.
The execution schedule is broadly as follows (designed to complete repayment before interest accrues at 2:00 p.m. AEST / 3:00 p.m. AEDT the next day):
These times are indicative only; Tiger Brokers Australia may adjust them at any time without notice.
If the feature is switched off and you have insufficient balance in the currency needed for a purchase (for example USD), that trade becomes a margin trade, and other currencies in the account (for example AUD) act only as collateral — no automatic conversion or repayment takes place. Unless you convert currency yourself or repay using settled proceeds from selling positions in that currency, the borrowing continues to accrue interest until it is cleared.
Another reminder: withdrawals do not auto-convert
If your account holds only HKD cash but you choose to withdraw USD, the system will not convert currency automatically — doing so creates USD financing. If financing has already arisen, you can clear the debit balance and accrued interest after the withdrawal by converting currency or depositing funds.
Key takeaway
Multi-currency financing can reduce frequent manual conversions, but it creates a debit balance in the target currency, along with financing costs and FX risk.
Further reading (Help Centre)
Quiz
Suppose your margin account holds AUD 20,000 and USD 0. You buy a US stock without converting AUD to USD first. What is most likely to happen?
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A. Tiger automatically converts your AUD to USD for free
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B. The trade cannot go through until you manually convert currency
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C. A USD margin loan is created, and interest may accrue on the amount borrowed
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D. Your AUD balance automatically becomes USD collateral with no financing cost
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Upgrading to a margin account provides access to a broader range of tools and features. Whether to use these features should be considered carefully based on your investment objectives, financial situation, trading experience, and risk tolerance. For more details on margin account features, currency-specific interest rates, and fee schedules, please visit the Margin Account page and Pricing page, Help Centre and our Risk Disclosure.
This material is provided for general information purposes only and does not constitute financial product advice, investment advice or a recommendation. This information does not take into account your objectives, financial situation or needs. Any securities mentioned are provided for illustrative purposes only and do not constitute a recommendation, solicitation or endorsement. All investment products carry risk and are not suitable for all investors. Margin lending and short selling carry a high level of risk and may not be suitable for all investors. If the value of your collateral falls or your position moves against you, Tiger Brokers (AU) may be required to sell your holdings or close your positions without prior notice to meet margin requirements or limit potential losses. Rates, margin requirements, product features and eligibility criteria are subject to change, and the information available on the Tiger platform and official website at the relevant time will prevail. Before trading, please read the relevant PDS and T&Cs, ensure you fully understand the risks involved, and seek independent professional advice where appropriate.
Disclaimer: Investing carries risk. This is not financial advice. The above content should not be regarded as an offer, recommendation, or solicitation on acquiring or disposing of any financial products, any associated discussions, comments, or posts by author or other users should not be considered as such either. It is solely for general information purpose only, which does not consider your own investment objectives, financial situations or needs. TTM assumes no responsibility or warranty for the accuracy and completeness of the information, investors should do their own research and may seek professional advice before investing.
For me, the biggest advantage is convenience, especially when trading US stocks without having to manually convert AUD to USD every time. However, I’d still keep a close eye on the USD borrowing cost and AUD/USD movements, because the financing creates additional FX and margin risks.
I also think the end-of-day currency conversion repayment feature is useful if I have eligible settled funds available. It can automatically use those funds to reduce the outstanding currency borrowing before interest accrues, but I’d still make sure I understand the rules and don’t rely on it as a substitute for managing my overall margin exposure.
@Tiger_comments @TigerStars @TigerClub @Tiger_AU
For Australian investors holding mainly AUD, multi-currency margin financing can make accessing US stocks much more convenient. If you have AUD 20,000 and USD 0, you can purchase a US stock without first manually converting your AUD into USD. The trade can be supported through USD financing, allowing you to stay invested without interrupting your trading flow.
What makes this especially useful is the flexibility: you can choose when to convert currencies and, with the end-of-day currency conversion repayment feature enabled, eligible settled funds may be automatically used to reduce outstanding currency borrowings.
In short, multi-currency financing gives investors greater flexibility, smoother access to global markets, and more efficient management of different currencies.
@Tiger_AU [哇塞]