340. The status of resident, once it has been acquired, is retroactive to the first day of the period of residence.
However, there shall be no retroactivity where a person who arrives in Québec had previous residence elsewhere in Canada. In such case, the status of resident of Québec is acquired with effect from the first day of the third month following the month of arrival.
Students from another province shall not be considered residents of Québec unless they prove that they have lost their eligibility as residents of their province of origin.
R.R.Q., 1981, c. S-5, r. 1, s. 340.