Details on the deal were not immediately available. On Tuesday, Republicans said they were close to agreement on a package that included a cut in the corporate tax rate to 21 percent, from a high of 35 percent today, and reducing the top income tax rate for individuals to 37 percent from 39.6 percent.

It is not clear if Republican senators will roundly endorse the deal, which would allow provisions that Senators Susan Collins of Maine and Marco Rubio of Florida had raised concerns about earlier this week. Ms. Collins has said she’s not in favor of a lower individual rate and Mr. Rubio has pushed for a more generous child tax credit.

The Senate bill narrowly passed 51-49, with Senator Bob Corker, a Tennessee Republican, voting against the legislation, and other lawmakers, such as Ms. Collins, only getting on board once certain changes were made, such as expanding the medical expense deduction.