Attendees were also told by Mr. Ryan that Republicans would phase in a full repeal of the estate tax over several years.

The House bill will include a worldwide minimum tax on multinational corporations’ profits, two people with knowledge of the drafting said, in an effort to prevent companies from shifting money abroad as the United States transitions to a so-called territorial tax system, which would subject only income earned domestically to the American corporate tax rate. The tax would be on all global income, and not on a country-by-country basis, as some companies had feared.

Republican leaders also confirmed they would maintain a federal tax deduction for at least some state and local property taxes paid, while eliminating comparable deductions for income and sales taxes.

Other issues remained in flux or unknown outside of a select group of lawmakers and congressional staff. Those include the size of an expanded child tax credit; whether to phase in or sunset some rate cuts; and the specifics of how the plan might affect tax-free retirement savings.

Mr. Trump invited nearly two dozen leaders of major business groups — including the U.S. Chamber of Commerce, the American Petroleum Institute and the American Farm Bureau Federation — to the White House on Tuesday morning to discuss the bill. In the afternoon, Mr. Ryan met with Mr. Trump and then with more than a dozen conservative groups on the tax bill, including the Heritage Foundation and Americans for Prosperity.

Each of those groups — and in many cases, individual companies — will be watching for how lawmakers change tax breaks large and small in their overhaul of the tax code. Business leaders, in particular, are ready to applaud or attack the bill depending on how those changes affect their bottom lines.

“We’re trying to see, and evaluate with a calculator at the end of the day, are the incentives going to be right to help the economy to grow?” said David Stevens, the president of the Mortgage Bankers Association, whose industry has much at stake in the rewrite of the tax code.