S. 201 : Deduction at source – Failure to deduct or pay – Leave travel concession — Estimate of income – Assessee in default Public sector Bank — Employees travelling not only to domestic destination but to foreign countries – Not taking shortest possible route — Employees not entitled to exemption — Leave travel concession reimbursed without deduction of tax at source —Assessee could not claim ignorance about travel plans of employees- Complete facts available- Not a bona fide mistake-Liable to pay interest . [ S. 10(5), 192(1) ,201(1), ITR . 2B]