A bank may dishonour a cheque if the amount on the cheque is more than the amount in the account. This means that there are not enough funds in the account to cover the amount written on the cheque. Banks are required to ensure that there are sufficient funds in an account before honouring a cheque. If a cheque is dishonoured, the bank will return the cheque to the account holder with an explanation of why it was not honoured. This could be due to insufficient funds, a stop payment order, a closed account, or other reasons. Dishonoured cheques can result in additional fees, legal action, and damage to the account holder's credit rating.