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WATCH: Revenue will use this system to spot homes undervalued for Property Tax

A custom-built programme using Google Maps and CSO data can spot homes that have been undervalued in comparison to similar homes.

Image: Sam Boal/Photocall Ireland

THE REVENUE COMMISSIONS will use a combination of Google Maps, Google Street View, and CSO data to track down houses that they believe to have been undervalued for the Local Property Tax (LPT), it was revealed today.

A guide to correcting under-valuations has also been released, in order for homeowners to meet a deadline of March 31 to reassess their home or face penalties.


If the property owner has not engaged with correspondence from Revenue regarding an undervaluation, a daily interest amounting 0.8 per cent per annum on the tax owed will be charged, and potentially additional penalties on top of this.

“If, however, the property owner has engaged honestly and realistically with the self-assessment process having regard to the guidance available and property values at 1 May 2013,” Revenue said in a statement today, “there should be no issue regarding their valuation.”

The latest figures show that Revenue are receiving 1,500 returns every day, with more expected in the coming weeks.

So far in 2014, it has seen as 83 per cent compliance rate, covering 1.82 million properties.

If you do undervalue your home, how will Revenue find out? They gave us a quick demonstration of software currently being trialled…

Revenue officials have stressed that the system is only available to staff who require it, and will not be freely accessible to employees.

Access is logged, and audits will be carried out on a regular basis, they said.

Information available include the LPT band the house has been valued in, the householder’s tax details, and whether or not they have paid the Household Charge.

Revenue has constructed various statistical models that will map problem households.

The system will highlight if a single property has been undervalued compared to others in its neighbourhood.


The acceptable deviation will vary depending on the estate. In a row of houses that were built at the same time and mostly of the same structure, Revenue will be looking for houses that vary only slightly from their neighbours, based on the valuation from the property price register.

In areas where houses are mixed, a larger difference in the bands betweens houses will be allowed. An even more generous allowance will be allowed in rural areas.

In the example below, the house highlighted in red valued five bands below its valuation by Revenue.

“If we find properties like this, the next stage is to review them,” Dr Keith Walsh, Principal Officer at the Statistics & Economic Research Branch said, “And to see if there is a case, if there is a reason that Revenue can challenge them or if there is a reason why this person’s house shouldn’t be valued as highly as their neighbours.”

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He explains more in the video below:

(Video Credit:

And here’s the information that can then be seen:

imageClick here to see a larger version.

If Revenue believe a property has been undervalued, they will contact the owner to alert them to this. Site visits, while “a last resort”, are legally possible.

Incidents where homes have been undervalued will be assessed on a case-by-case basis, Dr Walsh said, as many different situations can apply.

Revenue will not be searching for cases where properties have been overvalued, officials said today, but if a homeowner believes they have, they can write to Revenue and submit appropriate documentation.

All information seen above does not correspond to any actual citizen or household in Ireland, and was created purely as a demonstration of the system.

Read: The table which shows how much property tax you’ll have to pay >

About the author:

Nicky Ryan

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