Firstly is this the correct calulation and secondly how do I enter this in sage. Is it a simple Jnl to Mileage allowance in PL and to Sole traders drawings account?
Yes, the calculation's right (assuming that there was no business mileage between 6 April 2002 and 31 July 2012). Should the period covered by the mileage claim be 01/08/12 to 04/04/13?
As you suggested, it would be posted as a journal entry on Sage (although I would tend to credit capital introduced rather than the drawings account).
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Pearce & Co - Chartered Accountant and Chartered Tax Adviser