Bhatnagar established an independent tax practice in 2012, having spent more than 17 years working with Supreme Court advocate Ravinder Narain. Before that she worked with Delhi litigation firm J B Dadachanji & Co.

Bhatnagar has represented several Indian and multinational companies in disputes with the Indian national and state governments and commissions before the Supreme and High Courts as well as numerous tribunals.

She regularly acts in post-manufacturing expense and unjust enrichment matters as well as valuation, classification, promissory estoppel and luxury and entry tax cases.