Revenue Commissioners chairman Josephine Feehily has said thousands of people will wrongly receive letters telling them to pay the household charge.
Ms Feehily said mismatches between the data of the Local Government Management Agency and the Local Property Tax database mean that thousands of people will wrongly receive notices.
Speaking on RTÉ's News at One, she said they should make the Revenue Commissioners aware immediately.
The Revenue Commissioners is to send letters to 250,000 property owners to get them to pay the Household Charge.
Over 100,000 of those individuals pay tax under PAYE and the letters will tell them that Revenue will ask their employers to deduct the charge.
The tax authority has acknowledged that its database might be wrong and some of the letters might be sent in error.
Ms Feehily said the Revenue Commissioners received details from the local government management agency, who recorded the person who paid the charge rather than the owner of the property on the database.
She said: "So for example if a son or daughter paid for a parent, their database would show that that property was linked to the payer, and when we tried to match that with our local property tax database we found mismatches.
“So we're saying upfront that some of the people who get letters who should not be getting them. They should tell us straight away, it is not millions of people but could be some thousands of people."
Revenue has decided to send compliance letters to individuals who have not paid the Household Charge before taking steps against those who have not paid the Local Property Tax.
It said 94% of taxpayers have now paid the Local Property Tax for 2013.
Three quarters of property owners self assessed within one valuation band of the estimate provided by Revenue.
