Thirty financial rights advocates will spend Monday meeting MPs at Parliament House in Canberra in an attempt to lift support for the government's plans to tighten rules around "small amount credit contracts".

Minister for Revenue and Financial Services Kelly O'Dwyer said last November the government supported new laws that would cap repayments on consumer leases to 10 per cent of a customer's net income and introduce a cap on the total payments equal to the base price of the good plus 4 per cent of that price per month. Existing price caps on so-called payday loans will also be retained.