My Wife and I Avail IT Benefits of Home Loan with Share. Can Share Be Terminated Before Expr. of Tenure?

home loan

My wife and I bought a house in December 2007 and chose to go into 25%-75% share to aim max tax subsidy on home loan. But after two-three years if we choose to buy another home in name of my wife, can I change the share percentage as 100% for me so that she will aim total tax subsidy on the home loan used to buy new home?