State prosecutors in Manhattan have subpoenaed President Trump’s accounting firm to demand eight years of his personal and corporate tax returns, according to several people with knowledge of the matter.
The subpoena opens a new front in a wide-ranging effort to obtain copies of the president’s tax returns, which Mr. Trump initially said he would make public during the 2016 campaign but has since refused to disclose.
The subpoena was issued by the Manhattan district attorney’s office late last month, soon after it opened a criminal investigation into the role that the president and his family business played in hush-money payments made in the run-up to the election.
Both Mr. Trump and his company reimbursed Michael D. Cohen, the president’s former lawyer and fixer, for money Mr. Cohen paid to buy the silence of Stormy Daniels, a pornographic film actress who said she had an affair with Mr. Trump. The president has denied the affair.
It was unclear if the broad scope of the subpoena indicated that the office had expanded its investigation beyond actions taken during the 2016 campaign. A spokesman for the Manhattan district attorney, Cyrus R. Vance Jr., declined to comment.
The state prosecutors are seeking a range of tax documents from the accounting firm, Mazars USA, including Mr. Trump’s personal returns and those of his business, the Trump Organization. The subpoena seeks federal and state returns for both the president and the company dating back to 2011, the people said.
The investigation by Mr. Vance has been focused on $130,000 that Mr. Cohen paid Ms. Daniels, whose legal name is Stephanie Clifford, just before the election. Mr. Cohen pleaded guilty last year to breaking federal campaign finance laws and received a three-year prison sentence.
While the federal prosecutors who charged Mr. Cohen stated in a court filing in July that they had “effectively concluded” their inquiry into possible crimes committed by the company or its executives, Mr. Vance’s office is exploring whether the reimbursements violated any New York state laws.
In particular, the state prosecutors are examining whether the company falsely accounted for the reimbursements as a legal expense. In New York, filing a false business record can be a crime.
But it becomes a felony only if prosecutors can prove that the false filing was made to commit or conceal another crime, such as tax violations or bank fraud. The tax returns and other documents sought from Mazars could shed light on whether any state laws were broken. Such subpoenas also routinely request related documents in connection with the returns.
Democrats have insisted for years that Mr. Trump release his tax returns, which every modern presidential nominee has done before him. They contend that the president may be trying to conceal details of his actual financial worth, the source of his wealth and possible conflicts of interest involving his business partners.
Congressional Democrats have taken an aggressive approach, subpoenaing six years of Mr. Trump’s tax returns from the Treasury Department, as well as personal and corporate financial records from Deutsche Bank, Capital One and Mazars USA.