Specific deductions - interest: Overdrawn capital account - adjustments for depreciation and losses
This chapter applies for Income Tax purposes to the computation of trade profits and property income. References in the text to a ‘business’ should therefore be taken to include both trades and property businesses. The chapter does not apply for Corporation Tax purposes, where there are separate rules in the loan relationships legislation (see CFM11000).
S34 Income Tax (Trading and Other Income) Act 2005
In many cases depreciation is charged in the profit and loss account and this reduces the net amount of profit credited to the capital account. A business which provides for depreciation lowers the amounts the proprietor can draw from the capital account without that account going into deficit compared to a business in otherwise identical circumstances who does not provide for depreciation. You need to adjust for accumulated depreciation in calculating a revised balance on the account. This was supported in Silk v Fletcher  SpC201, see BIM45725.
You will also have to consider the impact of losses on the capital account. If the capital account has become overdrawn because the business has made losses then it is not appropriate to restrict the interest deduction in the accounts, on the basis that the borrowings are providing working capital. If, however, the capital account then becomes further overdrawn because the proprietor takes out drawings, then it is appropriate to restrict the interest deduction.
Mr A sets up a new shop called `British Weather’ selling rainwear. He introduces £50,000 capital and borrows £50,000 from the bank. After a good initial period of trading, his trade is disrupted by continual road works in the area followed by an area regeneration project. The business makes trading losses totalling £30,000 in the first two years. At the end of year two he has taken total drawings of £20,000 out of the business so his capital account is nil (capital introduced £50,000 less losses £30,000 less drawings £20,000). He sees signs of improvement to the business so borrows a further £50,000 from the bank. In year three he takes out drawings of £10,000 and the business makes a trading loss of £5,000, so his capital account is overdrawn by £15,000 at the end of the year. The restriction of the deduction for interest is based on the drawings of £10,000 and not on the total amount of the overdrawn capital account.