Cash Basis Allowable Expenses: When You Deduct, Not What
Under the cash basis you deduct an expense in the tax year you pay it, not the year you are billed for it. The wholly and exclusively test still decides whether a cost is allowable at all. What the cash basis changes is timing, plus the treatment of capital spending, which comes off as an ordinary expense when paid instead of going through capital allowances. This page covers the timing rule, the ITTOIA 2005 s.33A excluded list, interest now that the £500 cap is gone, stock, and the errors that cost people money.
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