Transparency Solomon Islands says the people are voicing their displeasure at changes making the salaries of MPs tax free, and they are calling for a review of the decision.
Transparency's Chief Executive Daniel Fenua says the decision by the Parliamentary Entitlements Commission is a clear abuse of the power and responsibility entrusted in it.
He says having two former MPs on the Commission creates a clear conflict of interest.
"We have got people's reaction to the issue as being very unfair. If you look at the social media and we have got calls from the public and as well as some organisations. Calling on the government that they should review the decision made and to revoke especially the one where MP's salaries are tax free at the moment."
Mr Fenua says Transparency is investigating the legality of the commission's actions.