The Revenue Commissioners will begin deducting estimates of property tax from payroll or social welfare payments of people who have refused to pay the charge at the end of June.
Self-assessed taxpayers who have not paid will be surcharged on their tax return from October.
That will have the effect of doubling the property tax.
The Revenue has said it had reached its target of sending out 1.66m letters to liable property owners.
However, Revenue chairman Josephine Feehily admitted that not everyone who was liable to pay had received a letter.
She estimated the numbers who failed to get a letter was "in the thousands".
But she stressed people who were liable and who had not received a letter had to contact Revenue and pay the tax.
Almost 220,000 property owners have filed returns telling the Revenue Commissioners how much they owe.
Homeowners have another five weeks before the filing deadline.
Ms Feehily described the reaction from the public to the tax as ''excellent''.
Separately, Revenue expects to collect an additional €65m in tax from retired people.
It follows a campaign last year to ensure that individuals in receipt of a private pension also declared if they had a State pension.
The tax authority said in three quarters of cases no issues arose.
However, it said 30,000 people who had a private pension never reported their Department of Social Welfare pension to Revenue.
Some 85,000 individuals under-reported their circumstances or their situation had changed since they had originally contacted Revenue.
The organisation refunded €1.1m to pensioners who paid too much tax.
In its annual report today, Revenue admitted its approach "did upset some people".
Last year, Revenue collected €36.7 billion in tax - an increase of 7% on the 2011 total and its audit activity raised €359m following 9,066 interventions.
One million litres of illegally laundered fuel was seized, while nearly 100 million illegal cigarettes valued at €45m were also seized.
Today's annual report said that the cost of running Revenue fell by €10.4m last year. Since 2008, annual running costs were reduced by over €103m (21%).