According to figures, 31,524 doctors declared zero income but filed collective tax refund claims of 1.3 billion. A policeman walks past the Federal Board of Revenue (FBR) office building in Islamabad August 29, 2018. Photo: REUTERS The Federal Board of Revenue has decided to tighten the noose around private doctors, clinics and private hospitals allegedly involved in tax evasion worth billions of rupees. The decision was taken in the light of the latest statistics obtained during the analysis of FBR data, which revealed large-scale alleged tax evasion by doctors across the country. Despite having taxable income, more than 73,000 registered