It is reported that children have received letters from Revenue demanding payment of the property tax.
According to the Irish Independent, flaws in the database have resulted in "errors" as the 1.6 million letters about the property tax are posted out to homeowners.
In some cases, children have received a notice seeking payment, with one irate mother telling the newspaper that her 15-year-old daughter got a letter from Revenue.
The blunder from Revenue comes as a national day of local protests against the property tax gets underway around the country.
It follows a huge reduction of the number of houses eligible to claim exemption from the property tax on the basis of inhabiting ghost estates.
Of the 1,770 unfinished housing developments around the country, residents in only 421 will not have to pay the new fee.
Social Protection Minister Joan Burton said homeowners who believe they are entitled to a deferral of the charge should outline their reasoning on the tax forms.
Latest figures show of the 1.6 million homeowners liable to pay the levy, just over 7,000 have so far filled out their property tax forms and sent them back to Revenue.
Activists from the Campaign Against Home and Water Taxes will picket the clinics of several Labour TDs and County Council offices countrywide.
Campaign spokesman Michael O'Brien said there was going to be an angry backlash from affected people.
"The amount of exempt houses has gone from 43,000 down to 5,000," he said. "In other words, the Government is saying that 38,000 houses that were in ghost estates last year are all of a sudden in estates that are complete, which I think will come as a shock to people who are directly affected."
Protests happening today include:
10.30am: Artane Roundabout & 12.00 picket at clinic of Sean kenny, Donaghmede Inn.
10.30am: Office of Brendan Ryan, Dublin St., Balbriggan.
11am: Main St., Castletown Gates, Celbridge.
11am: Office of Pat Deering, followed by march to Liberty Tree at 12.30, Carlow
12 noon: Dublin Central, St. Peter's Church, Phibsboro Rd., pickets of clinics of Joe Costello and Paschal Donohoe.
12 noon: Dom Marmion Car Park, Sandyford Road, Dundrum.
12 noon: Bull Ring, Wexford.
12.30 pm: Shop St., mass leafleting, Galway
12.30pm: Mass leafleting at roundabouts, Portlaoise.
1pm: Blanchardstown. Fingal Council Offices
1pm: The Square, Main St., Maynooth, Co. Kildare.
1pm: West St., Drogheda, Co. Louth.
1pm: Town Hall, Bray.
1pm: Stall/picket Georges St, Dun Laoghaire
2pm: Office of Martin Heydon, Newbridge, Co. Kildare.
2pm: Bridge, Waterford.
2pm: Quayside, New Ross.
2pm: Ann Phelan's clinic, Patrick St., Kilkenny
2pm: Labour Party Offices, hartstogne St., Limerick.
2pm: Connolly Hall, Cork.