Please don't take this the wrong way but this sounds as though you are looking to give tax advice which is properly the territory of accountants.
Tax is a real minefield so I would suggest that your client see's an accountant or tax specialist for the advice and tax affairs and uses your services for recording day to day transactions of the business.
kind regards,
Shaun.
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Shaun
Responses are not meant as a substitute for professional advice. Answers are intended as outline only the advice of a qualified professional with access to all relevant information should be sought before acting on any response given.