An "alarming" 79% of all legal firms here have no Brexit plan in place, according to a new report by professional services firm Smith & Williamson.
The study also found, that of the Top 20 largest law firms, more than two thirds identify competition from UK firms opening offices in Dublin post-Brexit as a threat to their business.
55% of firms are also more concerned now about the potentially severe and lasting impact Brexit will have on their business than 12 months ago, a significant increase on the previous year.
Meanwhile, confusion over the possible impact of Brexit is underlined by the fact that nearly a quarter of respondent firms who remain unsure of the ways in which it threatens their business, with 33% also unable to identify any possible opportunities.
This year, Smith & Williamson's Dublin office completed a merger with LHM Casey McGrath, which saw it become one of the top ten largest accountancy firms in Ireland.
The firm now has 135 staff in its two Dublin offices and turnover in excess of €15m a year.
Smith & Williamson Professional Services Managing Director, Paul Wyse, said that in spite of last week's announcement of the withdrawal agreement, there is now a great deal of uncertainty about whether this deal will ever be implemented.
"In turn, this has raised concerns once more about the prospect of a hard Brexit and what that might mean for the Irish legal sector," he added.
Other findings in the survey indicate a continuing level of growth in the Irish legal sector, with 69% of firms reporting an increase in revenue and 60% showing an increase in profits.
