Opening a bank account in Taiwan is not hard once your paperwork lines up, but the order matters. The single thing that trips up new arrivals is trying to open an account before they have a local phone number, because the whole security model leans on SMS.
What documents do the big banks want?
For a standard resident account, the major banks want your Alien Resident Certificate (ARC) or Employment Gold Card together with your passport. The commonly used banks include CTBC, E.SUN, Cathay United, Bank of Taiwan, and Mega International. Each branch runs its own know-your-customer checks, and staff at branches near universities or business districts tend to handle foreigners more smoothly than a small suburban desk.
Two Taiwan-specific quirks catch people out. First, some banks still ask for a personal seal, the carved name stamp locals call a chop, instead of or alongside a signature; you can order one cheaply at a stamp shop near the branch. Second, initial deposits are modest, often in the NT$100 to NT$1,000 range, so you do not need to arrive with a large float.
Why the 09 mobile number comes first
Taiwan online banking and card activation lean heavily on SMS one-time codes sent to a local number that starts with 09. Without that number, you can sometimes open the account but you will struggle to enable app transfers, online payments, and two-factor login. That is why the practical sequence is: land, get a SIM, then open the bank account. Read how to get a mobile phone number first, because prepaid SIMs are quick at the airport while postpaid plans usually need the ARC too.
Once the account is live, it becomes the hub for rent transfers, utility auto-pay, and salary. If you are budgeting the setup, the everyday numbers sit in how expensive is Taiwan and monthly budget.
The Chunghwa Post option before your ARC
If you arrive before the ARC is issued, you are not fully stuck. Chunghwa Post, the postal savings system, can open a limited account earlier if you first get a Record of Identification Number (an official document confirming your assigned ID number) from the immigration authorities. That postal account covers basic deposits and transfers and buys you time while the residence permit completes. It is not a full replacement for a commercial account, but it lets you receive money and pay bills in the gap.
Common misconceptions
"Any tourist can open a Taiwan account on a passport alone." Full banks want the ARC or Gold Card; a passport by itself rarely clears their checks now.
"A signature is always fine." Several banks still expect a chop. Assume you may need one and order it before the appointment so you do not lose a trip.
Summary
Bring the ARC or Gold Card, passport, and a local 09 number, and expect a small opening deposit and possibly a chop at CTBC, E.SUN, Cathay, Bank of Taiwan, or Mega. Get the SIM before the bank, and use Chunghwa Post with a Record of Identification Number if you need banking before the ARC lands. Confirm each bank's current list before you go.
Sources
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