S&P Dow Jones publishes a list of Witholding Tax Rates by country here.
For some reason, Bermuda is not on this list.
What is the rate for Bermuda?
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Bermuda is not an independent country but a British Overseas Territory.
This page from PricewaterhouseCoopers says that "there are no withholding taxes in Bermuda". Whether that is enough for you is for you to decide.