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If you have contractors working through their own Limited Company's then you need to consider the impact of VAT when you set up your expense templates. You may wish to have one expense template for workers who are VAT registered and one for workers who are not VAT registered. You should seek professional advice if you require assistance in this area.
Mileage
You would typically configure mileage to allow a certain amount per mile. The contractor would then enter the number of miles travelled. The configuration for this can be seen below
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