Merger of two partnership firms

I am having two partnership firms wherein all the partners are common and their profit sharing ratio is also same. I want to merge both the firm into one or that i want one firm to take over all the assets and liabilities of another firm so that the another firm may be closed down. My query is whether any tax effect will arise in such a case? If yes, what should be best model for such an arrangement so that tax liability is reduced to minimum. If possible, kindly guide me about stamp duty implications also.