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His services in the US would be exempt from VAT. You must register when you go over the threshold, or know that you will. The threshold is based on your turnover - the total of everything sold that isn’t VAT exempt.
As his services in the US are not under VAT he would not have to register for VAT.
Please remember that you are required to rate in a positive way (look for the STARS or SMILEY FACES) so I am credited with responding.