Whether an individual is considered tax resident in Ireland in a particular tax year depends on the number of days (or part of a day) spent in Ireland in that tax year (or preceding tax year).
Revenue's existing position is that in circumstances where an individual is prevented from leaving Ireland on their intended day of departure due to "extraordinary natural occurrences" or an exceptional third party failure or action, none of which could reasonably have been foreseen and avoided, the individual will not be regarded as being present in Ireland for tax residence purposes for the day after the intended day of departure, provided the individual is unavoidably present in Ireland on that day due only to force majeure circumstances.
Revenue has clarified that where a departure from Ireland is prevented due to Covid-19, Revenue will consider this force majeure for the purposes of establishing an individual's tax residence position.