In his nomination papers, Mr Khajuria, 64, declared two cars worth Rs 7.75 lakh and immovable assets - including farm land, residential properties - in Pathankot, Bengaluru and Rajasthan.
The declaration included the assets in the name of his wife Tripta Khajuria too.
The movable assets of both Mr Khajuria and his wife have been declared at Rs 79 lakh and Rs 36.61 lakh respectively.
The retired army officer has an M Phil in defence and strategic studies from the University of Madras, according to the nomination papers.
The total income of the AAP candidate and his wife has been declared at Rs 15.67 lakh and Rs 3.78 lakh for 2017-18.
An official spokesperson said Rajinder Singh of Hindustan Shakti Sena and Santosh Kumari of Megh Desham Party too file their nominations on Thursday.
The last date for filing of nomination is September 22. Five candidates have filed nominations for the by-election required due to the death of BJP lawmaker Vinod Khanna in April. The polls will take place on October 11.
Follow NDTV for latest election news and live coverage of assembly elections 2019 in Maharashtra and Haryana.
Subscribe to our YouTube channel, like us on Facebook or follow us on Twitter and Instagram for latest news and live news updates.