You will need to decide upon your accounting date – that is, the date to which your accounts are drawn up. Enter the first day covered by the accounts in box (or 8) and your accounting date in box (or 9). You can choose any convenient date, for example, the anniversary of the date you began your business or , in a seasonal business, a date when trade is slack and stocks are low. You are entitled to change to a different date if you want to. However , whatever date you choose, you will find your tax is easier to work out if.