The bill is still subject to amendments and debate. The two House committees that wrote the legislation have scheduled hearings in the coming days. But the legislation was drafted in consultation with House leadership and Republicans on the other committees that oversee health care. President Trump, in a tweet and a brief statement from his press office Monday, signaled his general support for the plan.

The legislation comes with some numbers that we didn’t know before. Young adults who buy insurance coverage get $2,000 in federal cash to help them pay health premiums. Older adults get $4,000. Those numbers are higher than we’ve seen in previous G.O.P. proposals. But they would still mean that the Americans who have benefited most from the tax subsidies in the Affordable Care Act — individuals earning less than about $30,000 — would get substantially less help.

Obamacare’s subsidies were calculated to ensure that middle-class people didn’t have to spend more than a set percentage of their income on insurance. And a timely analysis from the Kaiser Family Foundation (based on a slightly earlier draft) shows that, in most parts of the country, low-income people would face a much larger gap between the value of their tax credit and the retail price of insurance than they do now.

Poor, older adults would face the largest crunch: The magnitude of their tax credits shrinks, even as a separate provision in the bill allows insurers to charge older people substantially higher prices than are allowed under the Affordable Care Act.

In some ways, the bill is less generous to the rich and less punishing to the poor than previous drafts of the legislation. The super-rich no longer qualify for a tax credit. Unlike previous drafts, which allowed anyone, regardless of income, to qualify for assistance, the bill offers the full subsidies only to individuals earning less than $75,000 a year or to joint filers earning $150,000. The subsidies slowly decrease above that threshold, meaning the country’s unemployed millionaires would still have to pay full freight for their health insurance.