Late payment of tax

I have an income of just over Rs.5,00,000 per annum and also a senior citizn. But I did not take into account my deposit interest at the time of calculating my tax dues in March. As such I have to pay around Rs.30,000 now as dues over the tax already paid by self and TDS (pension). When I pay this amount now do I have to pay interest and if so at what rate and under what section do I pay the dues?

Gopakumar

9895761405