"The income tax department served me a notice on Saturday evening in a nine-year-old-case to pay Rs 11.96 lakh tax," Yadav told PTI.
The matter regarding tax payment was pending with the IT after he filed an appeal at that time itself, Yadav said, adding "I have sent an explanation to the IT office Patna today through my chartered accountant explaining the entire issue."
Yadav alleged that he was being harassed by Congress for meeting Modi on August 16 and said he would approach Patna High Court in case of adverse judgement by the IT department.
Yadav was expelled from Congress on August 19 after he failed to reply to a show cause served to him by the party. He had caused embarrassment to the Congress by singing paeans about the BJP strongman and making light of the party's Vice-president Rahul Gandhi.
Another Congressman Dasai Chaudhary, who had accompanied Yadav, had also been shown the door by the party.
Yadav had unsuccessfully contested on Congress ticket from Bettiah Lok Sabha seat in 2009.