This represents an increase of 140% from about Rs 2.7 lakh shown in his last affidavit five years ago (in 2013-14). The big jump took place in 2014-15 when his income rose to Rs 6 lakh, and it's been largely stagnant in the years since. Income disclosed by his wife Kanchan, however, shows a nearly ten-fold increase from Rs 4.6 lakh in 2013-14 to nearly Rs 40 lakh in 2017-18.

from Times of India https://timesofindia.indiatimes.com/india/nitin-gadkaris-annual-income-jumped-140-in-five-years/articleshow/68570648.cms