When U.S. Senate lawmakers changed just two letters used for a calculation in their proposed tax bill, they may have increased the number of junk-rated companies that would be hurt by tax overhaul.

The Senate tax bill is headed for a marathon debate this week after Republican leaders brought the measure to the floor Wednesday with the goal of holding a final vote by the end of the week. Here are the latest developments, updated throughout the day.

President Donald Trump is pitching the Republican tax-cut plan as aimed primarily at helping middle-class Americans, but the biggest beneficiaries of cuts in the individual tax rates are in the wealthiest income brackets.

Coinbase Inc. lost a bid to block an Internal Revenue Service investigation into whether some of the company’s customers haven’t reported their cryptocurrency gains.

Major companies including Cisco Systems Inc., Pfizer Inc. and Coca-Cola Co. say they’ll turn over most gains from proposed corporate tax cuts to their shareholders, undercutting President Donald Trump’s promise that his plan will create jobs and boost wages for the middle class.

Doing away with advance refundings would eliminate a crucial tool that’s saved governments tens of billions since interest rates tumbled after last decade’s recession.

Senate Republicans are discussing adding provisions to their tax bill that could trigger up to $350 billion in automatic tax increases over 10 years beginning in 2022, according to two people briefed by congressional staff members on the plan.