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Long story short - additions / deductions needs to be provided in the 'Detailed Profit and Loss' section before they will propagate to the final calculation. I raised the same query with the HMRC technical support team. For posterity sake, their response clarified that there is no issue with the HMRC tool. Full response from the CT Service representative (Lynne): """ Depending which accounts you've selected to file to HMRC (Micro, Full, Abridged) whilst you have probably entered the interest in the first part of the filing, that's within the 'Profit & Loss' section, you also need to include the figure in the 'Detailed Profit & Loss' section as well. If filing Micro-Entity (the most common), you select the 'Detailed Profit and Loss' tab from the left hand side of the screen (navigation frame), at which point you will be taken to the 'Detailed Profit & Loss' summary. Click on the 'Edit' link at the top line 'Profit or loss before tax' then input the interest received into Box CP43 then 'Save' and 'Continue'. You can adapt this instruction to fit the other two types of filing. Doing so will mean the interest is pulled through to the final tax calculation. """ That aside, many thanks to Lynne for the assistance and quick reply. Hopefully this will help anyone else caught out by the somewhat "less than optimally intuitive" user interface, at least for a first-time user such as myself.