Query on income tax filing

I am working with a private company and earlier while declaring investment details, based upon provisional certificate I have declared that I will be paying 198000 as interest towards home loan, but during the year I have made some advance prepayment and was able to pay only 148000 towards interest. Now the query is, if I have to pay income tax towards remaining amount that is 50000/- how should I pay the tax. Please guide me