R&D Expenses need to be filed on CT600

Thanks for your question. TinyTax is designed for straightforward micro-entity accounts and doesn't currently support R&D tax credit claims.

R&D claims require additional CT600 boxes and supplementary pages that we don't generate. If your company has qualifying R&D expenditure, you'd need to use HMRC's own software or a more comprehensive CT600 package that handles the R&D supplementary pages.