Hi,
First of all you need to prepare the annual accounts for the sole trader's business. These will be made up to his accounting date eg. 31 December. So all income and expenses relating to that accounting period must be included. You cannot choose which accounting period to recognise them in.
Secondly you must include the profits for the 12 month accounting period (usually the one ending in the tax year - but you need to refer to HMRC's rules) which ends in the tax year, so the year ending 5 April 2012 in the self employment section of the self assessment tax return.
You can claim capital allowances in respect of the capital item on the tax return - you will need to check the rules for this.
Then if the person also has employment income, you need to include the employment income (Per his P60/P11d) for the year ended 5 April 2012 in the employment pages.
(and of course complete any other pages which are relevant to his circumstances).
I'm afraid I am not 100% sure on what you are trying to do from the details provided, but I hope this is of some help.
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