Too often newsagents get their accounts done annually, long after the end of the financial year. My recommendation is that you get your accounts done quarterly within a few weeks of the end of each quarter as this provides visibility of potential issues with theft and other business challenges.
With accounting systems today and the ability to automatically feed data from your newsagency software getting accounts done is not as complex as it once might have been. Talk to your accountant about streamlining your process so that you have better information on which to base your business planning and decisions.