If you cannot pay your tax on time, you may be able to arrange to pay your self-assessment tax liability in installments. To do this you should contact HM Revenue & Customs on the Business Payment Support Service on 0300 200 3835 or arrange to pay in installments via your Government Gateway account.
Research and development tax credits are available if the company is engaged in research and development and the company makes a trading loss; either where there was a trading loss before the enhanced R&D expenditure at 230% was applied, or where a trade profit became a loss because of the R&D enhanced expenditure.
A certificate of residence is required to claim tax relief in another country if the company pays tax on its foreign income in the UK. If the company has already paid the tax it may be due a tax refund.