The Campaign Against Household and Water Taxes has claimed that 10,000 marched at the Fine Gael Ard Fheis today.
The Taoiseach Enda Kenny is expected to outline Government plans to deal with the ongoing mortgage crisis in his keynote speech to the gathering tonight.
The protest group said: "The march showed the level of public opposition to this tax on the day over one million households boycotted registration."
The Taoiseach has become frustrated at how slowly the issue of the mortgage crisis is being dealt with.
Mr Kenny has already set up a temporary Cabinet Committee to try and see more action in this area.
Tonight he is expected to outline plans for negative equity mortgages and mortgage to rent schemes in a bid to keep people in their homes.
In his speech tonight the Taoiseach is likely to insist the Government needs to take action so that the shameful and corrupt practices outlined in the Moriarty and Mahon reports never happen again.