Some Tasmanian people with a disability find it so difficult to claim payments they are eligible for that they resort to lower Newstart payments.
SpeakOut advocacy practise leader Julie Butler said these people struggled to access required information to support their Disability Support Pension.
"Doctors and psychologists don't know how to write to satisfy the requirements," she said.
"People get report after report until they get someone who knows how to adequately write a report addressing the requirements.
"There are long waiting lists for allied health professionals."
Ms Butler said as a result, people with disability accepted the lower Newstart payment which rarely compensated for their disability.
The maximum basic rate for the disability pension is $843.60 a fortnight compared to the $489.70 Newstart payment for a single adult.
Three reports related to the disability pension were tabled in Parliament this week including one from the National Centre For Social And Economic Modelling which stated a person on a disability pension spent on average $107 a week more than others.
This was put down to additional living costs to do with transport, access to health services and appropriate housing.
The report said the federal government needed to spend $3.1 million to fill the gap.
Disability Advocate Network Australia chief executive Mary Mallett (pictured) said people in regional areas who were eligible for the disability pension struggled to meet criteria to be approved for the payment.
She said specialists required for assessment were few in regional areas and people with disability.
Ms Mallet said people with a disability either had to find specialists in the private system or endure long waits to see specialists in the public system which often required transport to get assessed.
The NATSEM report found more than 200,000 Australians with disability receive the lower Newstart allowance.
It found tens of thousands of people did not receive any support at all.