I always enter mileage payments as cash payments to the P&L as motor or travel expenses so there is no need to setup a supplier for each employee.
With regards to VAT you can only claim this on the approved petrol element of the payment and you need to ensure you have the right paperwork in place. With regards to processing this it will be a standard VAT code, i.e. T1 but make sure you adjust the VAT figure to the correct amount you will have calculated.
Depends - I have used both methods. If money owed to staff I have sometimes opened up supplier as an expense so I am aware of amount still to be paid. T1 / dont forget to calculate only % of VAT claim.
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Donna Curling - Complete Book-Keeping Ltd (CBKLtd) - 07939 101900