Neal demanded the tax returns after Treasury Secretary Steve Mnuchin said the agency would miss the initial April 10 deadline.
Mnuchin seemed skeptical of the committee's request.
He told the committee in a previous response that he was talking with the Justice Department over concerns that the request wasn't constitutional.
In his latest letter to the IRS, Neal said failure to send the president's tax returns by April 23 will be "interpreted as a denial of my request." The move could set up a legal face-off between the White House and Congress.
New York lawmakers are close to passing the TRUST Act, a law that will require the state's commissioner of taxation and finance to cooperate with Congress with its investigation into President Trump's..