With just six days to go until the deadline for the Household Charge, new figures show that more than 1.2 million homeowners have yet to pay.
Up to 1.6 million final reminder leaflets are being issued this week to all those liable for the €100 tax.
The Environment Minister Phil Hogan has said teams of local authority workers will be sent out to each household, to knock on doors and ensure everyone pays up.
However, Chairperson of the Household Charge Project Board, Jackie Maguire, has said this process will not begin until after the March 31 deadline.
The Dublin Council of Trade Unions has hit out at plans to send the workers to homes whose owners have not signed up.