The Greens have renewed their calls for an overhaul of federal parliamentary allowances following reports that MPs can claim tax deductions on property expenses in Canberra while getting a tax-free $273-a-night travel allowance.

The major parties were in lock-step on Sunday defending the politicians' perk that allows MPs to claim income tax deductions on rent, rates, electricity and mortgages.

Under a little-known tax ruling, MPs who rent a property from a family member such as a spouse can claim lease payments, rent, rates, taxes, insurance and even minor maintenance to reduce their taxable income.