Ivanka Trump is officially joining her father's administration as an unpaid employee with the title Assistant to the President, the White House says.
The US first daughter bowed to pressure following an outcry from ethics experts at her initial plans to serve in a more informal capacity.
Ms Trump, 35, said she had "heard the concerns some have with my advising the president in my personal capacity".
Her husband, Jared Kushner, is a senior adviser to President Donald Trump.
In a statement, the White House said it was "pleased that Ivanka Trump has chosen to take this step in her unprecedented role as first daughter".
Ms Trump also in her statement said she had been "working in good faith with the White House Counsel and my personal counsel to address the unprecedented nature of my role".