"This Act is an interim step that can be done quickly and serve as a floor on taxes for the highest-income taxpayers, cut the deficit by billions of dollars a year, and help encourage more fundamental reform of the tax system," it adds.

More immediately, the bill would require all income earned above $1 million to pay a minimum tax of 30 percent. On Monday evening, the Senate will vote to end debate on a motion to proceed to the bill, which could be blocked by Republicans who oppose the tax increase.

Republicans in the House are preparing their own path toward tax reform, one that would lower overall tax rates in return for eliminating some tax deductions.

In an email sent Monday morning, House Republicans said Democrats are missing the point that the struggling economy demands reduced taxes, not tax hikes.

"This week, when everyone is filing tax returns, the Senate will vote to increase taxes that will discourage economic growth and decrease investment," House Speaker John BoehnerJohn Andrew Boehner4 reasons Mike Pompeo will succeed at Foggy Bottom The misunderstood reason Congress can’t get its job done GOP sees McCarthy moving up — if GOP loses the House MORE's (R-Ohio) office said. "In contrast, the House will vote to cut taxes for small businesses and expand opportunities for small business growth and job creation."

The House this week will take up a bill offering a 20 percent tax cut for small businesses.