What are the available currencies that Taiwan clients can hold in their IBKR account?

The term Base Currency is used for accounting purposes to refer to the currency in which an investor maintains its book of accounts. For purposes of an IBKR account, each client will specify at the point of application a single Base Currency which will determine the currency of translation for statements and the currency used for determining margin requirements. While the Base Currency selected will typically be the principal form of currency in which the client intends to hold cash and the denomination of instruments which the client trades, clients are eligible to hold cash balances and trade instruments denominated in either a Base or non-Base Currency. If the client elects to maintain a cash account then they are restricted to holding only long cash balances regardless of the currency of denomination. …

Clients can hold multiple currencies in their IBKR account. Clients can generally deposit and withdraw funds in the currency of their residential country, the base currency of their account, or a common currency (USD, EUR, HKD, GBP, AUD, SGD, CHF, CAD or JPY). Please note that IBKR will not automatically convert currency when placing a withdrawal. The currencies that can be held and traded are:…

Yes, you can select your base currency when completing the application. The base currency does not need to be the same that you deposit into your account.

Once the account has been opened, it is possible to change the base currency in Client Portal…

Clients may select a Base Currency other than USD for their IRA account although this election does not allow any different trading permissions than those determined by the "Cash" or "Margin" type account election. In addition, only balances denominated in USD may be withdrawn or transferred from an IRA account. …