Merger is one of the ways to increase the efficiency of banks. Merger of companies, including banks, is possible in two forms: simple merger (unilateral) and consolidation (bilateral merger). In the first method, one company merges with another company. The legal personality of the merged company is obliterated by this action and all its debts, property and partners are transferred to the surviving company. In the second method, two or more companies are merged and a new company is formed from their combination. The merger of banks is permitted under the provisions of the Banking Administration Bill. Simple merger of banks is one of the ways to increase the efficiency of banks. There are several legal questions about simple merger of banks that are not explicitly answered in the above bill and other laws governing banks and companies, and should be answered properly by legal analysis. Simple merger of banks increases the capital of the merging bank, this capital increase has certain legal issues and aspects that are not discussed in other forms of capital increase. If the policy of merging the banks of the country is implemented as a solution to increase their efficiency by using the current legal capacity contained in the Bill of the Banking Administration, first the legal aspects of this phenomenon should be analyzed and a clear answer to the ambiguities should be provided. There are four important issues in increasing the registered capital with the issuance of new shares, the verdict of which should be clarified in case of increasing the registered capital due to the simple merger of banks; these issues are: the pre-emptive right of shareholders to buy new shares, the added value of new shares, the method of payment of the nominal amounts of new shares and the exemption of new shares from registration with the Exchange and Securities Organization.