Bank balance as per ledger or balance sheet should be considered. The difference due to " Cheques issued but not cleared or Cheques deposited but not cleared " will be part of BRS
Same thing I had told her in first query and reply , you have to take balance as per books ( Financial statement ) , to carry forward next year not as per bank statement .
Accordingly there is always a small difference due to discrepencies in book keeping. The audit thrshold of 3% saves everyone in the company with errors. BRS is the easiest and tracking invoices the the next big challange.