Deducting the property tax at source from Social Protection payments has been discussed by high ranking civil servants, documents released to RTÉ's The Week in Politics have revealed.
Minutes of a meeting between officials say it poses a challenge to deliver this on time, and policies must be "resolved" to see how much can be deducted from payments.
In order to make the deduction, Revenue said it would need information from the Department of Social Protection's customer files.
More resources would also be required by the Department of Social Protection, the minutes, released under the Freedom of Information Act, state.
The matter was discussed when the department and Revenue's "High Level Steering Group" met on 27 September. They are set to meet again on 13 December, after the budget.
Fr Seán Healy of Social Justice Ireland said that there is no justification for taking part of the property tax from Social Protection payments.
He said that 88% of people aged 66 and over would be in poverty without the Old Age Pension.
Fianna Fáil’s Finance spokesperson Michael McGrath said this demonstrates just how much of a minefield the introduction of a property tax is.
He said that many families are entirely dependent on Social Protection payments to get by.