The Revenue Commissioners has said it had more than 25,000 calls to the Local Property Tax Helpline by 5.30pm today.
It comes ahead of Wednesday's deadline for single payment notifications.
Revenue said it had processed almost 21,000 card payments over the past two days.
It said it had dealt with almost 14,000 today.
Revenue said there were 7,000 credit card payments over the last 24 hours up to lunchtime.
The compliance rate last year was 95%.
Revenue is urging those who have yet to pay their property tax to make contact before Wednesday's deadline.
Earlier, Revenue Local Property Tax Manager Vivienne Dempsey told RTÉ's Sean O'Rourke programme that people will be deemed to be compliant once they make an effort to engage with Revenue before Wednesday.
