The district attorney obtained the sought-after files earlier this year, and the office's probe continued to heat up, with the hiring of a forensic accountant and outside counsel with experience prosecuting the mob to help out on the investigation.
The panel, convened by Manhattan District Attorney Cyrus Vance, could also decide to indict executives at the Trump Organization or the business itself if criminal charges are presented, the Post reported.
Such juries are made up of citizens who examine the evidence in secret before deciding whether to pursue charges.
Vance and NY state Attorney General Letitia James, both Democrats, are investigating Trump's business dealings - prompting the Republican to claim he is being persecuted.
Vance has twice fought all the way to the U.S. Supreme Court to gain access to eight years' worth of Trump's personal and business tax returns.
"This is purely political, and an affront to the nearly 75 million voters who supported me in the Presidential Election", he continued, "and it's being driven by highly partisan Democrat prosecutors".
According to the Associated Press, one source says Vance's investigation into Trump involves "a variety of matters such as hush-money payments paid to women on Trump's behalf, property values and employee compensation".
Last week, James said her office was investigating the Trump Organization in a "criminal capacity" and was working with Vance's team.
Mr Trump is also facing a separate criminal investigation from the New York Attorney-General's office.
The Trump Organization did not respond to an AFP request for comment on Tuesday.