Revenue's cracking down on the number of homes that were 'significantly undervalued' in property tax returns.
According to the Irish Times, officials are targetting those that were estimated to be worth 'far lower' than guide values from May 2013.
Nearly a quarter of a million people estimated property value was more than 100 thousand euro below the amounts issued by the Revenue Commissioners at that time.
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Homeowners could have to pay back tax if officials believe the amount declared doesn't reflect the market value.