The term Set-off mean the same thing as combination of accounts, it also means the same thing as consolidation account. This suggests that there is existence of two or more accounts before this right becomes exercisable. The law on combination of account generally is that a bank unless precluded by agreement express or implied, from the cause of business is entitled to combine the account opened for the customer in his own right and in the same bank and treat the balance as that only amount in customer's credit.
Set-off is a legal right which entitles a debtor to take into account the sum immediately to him by a creditor when determining the net sum due to the creditor. It is based on the general commercial principle that says when debt are mutual, only the net balances is payable. According to the case of Ibrahim Alabi V Standard Bank of Nigeria, in which it was defined as the right which entitles the banker to retain a credit balance in customer's account against a debt owed to the bank or to treat the fund in customer's account as not available to meet drawings.
As far as the banker's right of set-off is concerned, there is a conflict of judicial opinions. In Garnett Vs Mckervan, it was held that in the absence of a special agreement to the contrary, a banker might set-off a customer's credit balance against a debt due to him from the customer, and that there was no legal obligation on a bank to give notice to a customer about its intention to combine accounts.
Nevertheless, in Greenhalgh and Sons Vs Union Bank of Manchester, the Learned Judge observed: “If the banker agrees with his customer to open two accounts or more; he has not in my opinion, without the assent of the customer, any right to move either assets or liabilities from one account to the other; the very basis of his agreement with his customer is that the two accounts shall be kept separate".
In view of these disagreeing judicial pronouncements, the banker can be on the safer side by entering into an agreement with the customer authorizing the banker to combine the accounts at any time without notice and to return cheques which, as a result of such an action, would overdraw the combined account.
Nonetheless, in cases such as the death or bankruptcy of the customer, in order to recover the net amount owing to him, the banker can exercise the right of set-off without notice even in the absence of an agreement.
At the same time, it may be noted that the right of set-off cannot be exercised by the banker if he has made some agreement, express or implied, to keep the accounts separate. This has been laid down in Halesovven Presswork and Assemblies Ltd. Vs Westminster Bank Ltd. Another point to be noted in this connection is that the banker cannot exercise his right of set-off if the accounts are not in the same right. For instance, the banker cannot setoff the credit balance on a partner's account against a debt due on the partnership firm's account and vice versa. Further, the banker cannot combine a trust account with the personal account of the customer.
Again, the right of set-off applies only to existing debts and not to contingent liabilities. Thus in Jefftyes Vs Agra and Masterman's Bank Ltd., the Learned Judge observed "You cannot retain a sum of money which is actually due against a sum of money which is only becoming due at a future date".
Furthermore, the right of set-off does not apply where the customer has deposited an amount taking a loan from a third party on condition that the money is repayable if not used for a particular purpose, the bank having been notified of this condition and where the customer is unable to utilize the loan due to liquidation, as was decided in Quistclose Investments Ltd. Vs Rolls Razar Ltd. (involuntary liquidation) and Other.
Conditions before right of Set-off can be exercised
i. The amount must be ascertained sum.
ii The debt must be due to and from the same person and in the same bank.
iii. The debt must be due for payment either immediately or on demand.
