Expenses are amounts that are incurred by a business or individual in the course of carrying out the work.
Expenses reduces the profit of a business and can include rent, wages or bank charges.
Expenses that are used to reduce the taxable profit must fit in with the "wholly and exclusively" used in the business term. Thus, any expense that is only incurred when running your business is usually claimable. However, items such as suits, glasses or other personal items that have uses personally are not usually allowable.