Joseph R. Biden Jr. plans to wind down his personal charity, the Biden Foundation, when he enters the 2020 presidential race, people briefed on the preparations said on Monday.

Mr. Biden, the former vice president, and his wife, Jill, formed the nonprofit group after he left office in 2017. The group had raised $6.6 million by the end of that year, financing initiatives on issues like expanding gay rights, making college more affordable and ending violence against women.

The Biden Foundation also became a gathering place for Mr. Biden’s longtime allies and political advisers in advance of a likely presidential campaign, with a board chaired by his former chief of staff, Ted Kaufman, and an executive director, Louisa Terrell, with deep experience on Capitol Hill and in the Obama administration.

By preparing to unravel his flagship organization, Mr. Biden may be hoping to avoid some of the financial and conflict-of-interest questions that shadowed Hillary Clinton during the 2016 presidential election, when her family foundation continued to operate and receive large donations and grants as she was pursuing the White House.