Is bank account necessary immediately after incorporation

As per section 10A of Companies act 2013 Declaration need to be filed along with proof of subscripttion money received by the company in form 20A with the concerned ROC within 180 days of incorporation of company, stating that the subscribers to the Memorandum of the company has paid the value of shares so agreed by them, along with a verification of registered office address of the company. And you need to attach Subscribers proof of payment for value of shares to form 20A.

Further company cannot accept subscripttion money in cash. Therefore you can not issue shares to subscribers to the memorandum without fulfilling the above post incorporation formalities. And hence transfer of shares which has not been allotted is not possible.