corporation tax for offshore sole-owned private unlimited company

I have an offshore solely-owned private unlimited company which is set up for investment and providing consultancy services. For the investment income or capital gains received by the company, and for the savings interest received by the company, do I need to report as personal income in addition to the corporation tax? I understand if the company pays me dividend, I'll need to pay tax. However, I don't know if the company's investment receives income, do I need to report as personal income tax + the corporation tax. That would mean I need to pay twice. As this is an offshore company, corporation tax is also paid in the overseas country. I understand there is a tax treaty between UK and that overseas country, how do I report the tax I paid in the overseas country? Thank you

Hi ,
 

Unfortunately HMRC cannot provide accountancy advice. You will need to engage the services of a professional advisor/accountant, to assist you with your enquiry.

Thank you .