"At no other place in the country, you have beneficiaries deciding on the increase of their own salary," Karat said during a conference.
"It is scandalous and I want to make sure that I vote against the proposed hike," she said.
The Lok Sabha witnessed an uproar last week by RJD, SP and JD-U members over the issue of salary hike decision. They demanded the wages be raised to at least Rs 80,001.
Following the uproar, the Cabinet agreed for a further raise in monthly allowances by Rs 10,000.