Morgan went into banking in 1857 at the London branch of merchant banking firm Peabody, Morgan & Co., a partnership between his Father and George Peabody founded three years earlier. In 1858, he moved to New York City to join the banking house of Duncan, Sherman & Company, the American representatives of George Peabody and Company. During the American Civil War, in an incident known as the Hall Carbine Affair, Morgan financed the purchase of five thousand rifles from an army arsenal at $3.50 each, which were then resold to a field general for $22 each. Morgan had avoided serving during the war by paying a substitute $300 to take his place. From 1860 to 1864, as J. Pierpont Morgan & Company, he acted as agent in New York for his father's firm, renamed "J.S. Morgan & Co." upon Peabody's retirement in 1864. From 1864–72, he was a member of the firm of Dabney, Morgan, and Company. In 1871, he partnered with the Drexels of Philadelphia to form the New York firm of Drexel, Morgan & Company. At that time, Anthony J. Drexel became Pierpont's mentor at the request of Junius Morgan.

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