The source, who asked not to be identified because the trial is being held behind closed doors, with information being restricted, said the judge in the capital, Naypyidaw, delivered the verdict within moments of the court session.
The case centered on allegations that Suu Kyi, 76, accepted 11.4 kg (402 ounces) of gold and cash payments totaling $600,000 from lawyer-turned-accused, former Yangon Prime Minister Phyo Min Thein.
Suu Kyi denied the accusations, describing the allegations as “ridiculous”.
It was not immediately clear if Suu Kyi would be transferred to a prison. She was held at an undisclosed location, where junta leader Min Aung Hlaing said she could remain after previous guilty verdicts in other cases.
The international community described the trials as absurd and demanded their immediate release.
The military says Suu Kyi is being prosecuted because she committed crimes and that she is subject to due process of law by an independent judiciary. A spokesman for the military council could not be reached for comment.
Since her arrest on the morning of February 1 last year, Suu Kyi has been charged with several crimes from violations of election laws and state secrets to incitement and corruption, charges her supporters say are fabricated to kill any chance of a political presence. Count.