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Is it possible to have the two running side by side?
Originally posted by looknohands
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Yes, but a couple of issues to start with.
Firstly, be wary of VAT. If HMRC get the slightest whiff that you are benefitting in terms of either not registering for VAT (i.e. splitting turnover over 2 businesses to avoid triggering the registration threshold), or putting VATable expenses through either business if it's VAT registered, they'll be over you like a rash, especially if both businesses are similar trades.
Secondly, a more practical problem in that you need to be mindful of claiming the right expenses through each business which can cause you a few book-keeping headaches. For example, if you use the same mobile phone, computer, broadband connection, van, tools, equipment, etc., you have to devise some way of claiming the relative usage of each through each business. Ie if you claim all your broadband through your sole trader business but use it half of the time for the new company, HMRC would be right if they decided to disallow half the costs you'd claimed and land you with a bill for extra tax and penalties!