Tim Delaney, head of the National Council of Nonprofits, which had inveighed against the proposal, said his organization was happy that the system had worked.

“I must say, I am also appreciative of the IRS and Treasury for listening,” Delaney said. “We asked them to withdraw it and they did.

“I think it’s a strong statement by them and the nonprofit community that rallied to protect the public in terms of saying ‘no’ to the gathering of Social Security numbers.”