You become a person resident outside India the day you leave — not after 182 days verified
FEMA's residence test is about purpose, not day-counting: a person who leaves India for employment abroad, for business abroad, or for any purpose indicating an intention to stay abroad for an uncertain period stops being a person resident in India from departure. The 182-day arithmetic in the definition serves other cases — it does not delay this one. The income-tax day-count test is a different law answering a different question: your bank accounts follow FEMA, not your tax return.