Question regarding opening bank here as a US citizen. I had to do the W9 form. The bank person said the US government will tax me based on the money I leave in the bank. I just wonder how does it all work. Will the tax be on the interest amount or the total balance amount?
Thanks in advance
TLDR : Answer Summary
The question addresses the tax implications for a US citizen opening a bank account in Thailand, specifically regarding the W9 form and US taxation on bank funds. Numerous comments clarify that US citizens are not taxed on their total bank balance but must report foreign accounts if they exceed $10,000. Only the interest earned from the account is subject to US taxation. Additionally, it's necessary to file an FBAR annually for accounts exceeding the $10,000 threshold. Different banks have varying policies concerning tax reporting, notably Citibank issuing a 1099 form and withholding Thai taxes which can be claimed as a credit on US taxes.