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I'm a UK citizen, can I use US stockbrokers?
The UK has historically aggressive financial law, inherited from Dutch friendship, influence, and acquisitions by conquest. The law is so open that nearly anyone can invest through the UK without much difficulty, and citizens have nearly no restrictions on where to invest. A UK citizen can either open an account in the US with paperwork hassles or at home with access to all world markets and less paperwork.  Here is the UK version of my broker, Interactive Brokers.  Their costs are the lowest, but you will be charged a minimum fee if you do not trade enough, and their minimum opening balance can be prohibitively high for some. If you do buy US products, be sure to file your W-8BEN.