Mr Nelson says he has written to Mr Coulton outlining how he believes the test unfairly discriminates against rural retirees.

The Dubbo voter believes the family home should be included as an asset for the pension eligibility test because those in Sydney have an unfair advantage over retirees in Dubbo.

Nelson claims Mr Coulton "has not indicated any willingness even to consider reform in this area."

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But Mr Coulton says he "made representation on Mr Nelson's behalf on September 23, 2014, to the then Treasurer, Joe Hockey,

"I brought Alan's concerns to the Treasurer's attention," he said.

"I received a letter from the then Minister for Social Services, Scott Morrison, on 19 March 2015, in which the Minister made clear 'the principal home was exempted from the assets test when it was introduced in 1985, in recognition of the unique importance placed on the family home in Australian society' as well as the 'broad political and community support for this exemption'.

"I regret that Mr Nelson was unhappy with the response he received; however, I feel that I have represented Mr Nelson's concerns to the best of my ability. I am pleased the then Minister for Social Services, Scott Morrison, saw fit to address Mr Nelson's concerns directly and as such I do not have any further information to provide on this matter.

"I work hard to represent Parkes constituents needs to my Federal colleagues. While I am proud of a strong success rate in achieving better outcomes for my constituents, there are occasions where this may not always be possible."