 He was born in Quebec City, the son of seigneur Gabriel-Elzéar Taschereau and Louise-Françoise Juchereau Duchesnay who was the daughter of Antoine Juchereau Duchesnay, and was educated at the Petit Séminaire de Montréal and the Séminaire de Nicolet.He married Adélaïde Fleury de La Gorgendière in 1819.Taschereau was named customs officer at Sainte-Marie-de-la-Nouvelle-Beauce in 1821 and then customs collector in 1822.