def find_all_by_tax_type(tax_type)
        raise AccountsListNotLoadedError unless loaded?
        @accounts.inject([]) do | list, account |
          list << account if account.tax_type == tax_type
          list
        end
      end
def find_all_by_tax_type(tax_type)
        raise AccountsListNotLoadedError unless loaded?
        @accounts.inject([]) do | list, account |
          list << account if account.tax_type == tax_type
          list
        end
      end
Return a list of all accounts matching tax_type.