(1)General betting duty is charged on a financial spread bet made with a bookmaker who is in the United Kingdom.
(2)It is charged at the rate of 3% of the bookmaker’s profits on financial spread bets for an accounting period.
(3)The bookmaker’s profits on financial spread bets for an accounting period are the aggregate of—
(a)the amount of the bookmaker’s ordinary profits for the period in respect of financial spread bets (calculated in accordance with section 131), and
(b)the amount of the bookmaker’s retained winnings profits for the period in respect of financial spread bets (calculated in accordance with section 132).
(4)Where the calculation for an accounting period under subsection (3) produces a negative amount—
(a)the bookmaker’s profits on financial spread bets for the accounting period are treated as nil, and
(b)the amount produced by the calculation may be carried forward in reduction of the bookmaker’s profits on financial spread bets for one or more later accounting periods.