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Good morning.

Here’s what you need to know:

Senate revises tax plan.

• In their effort to rewrite the U.S. tax code, Republican senators announced changes to their proposals on Tuesday to address two problems: math and politics.

The alterations would repeal the Affordable Care Act’s so-called insurance mandate, which would save hundreds of billions of dollars over a decade. (Our health care correspondent explains the reason for the mandate, one of the most unpopular parts of Obamacare.)

The Senate bill’s tax cuts for individuals would expire at the end of 2025, a provision that could secure the votes of the most conservative senators. The plan’s deep cut in the corporate tax rate would be permanent.

Separately, we examined every cut and increase in the House tax plan, and what they would cost. A vote on that proposal is expected on Thursday.