Cory Booker:
Helped people claim earned-income tax credit. 

Pete Buttigieg:
The wealthy should pay their fair share in taxes. 

Julian Castro:
Raise the top marginal tax rate; negotiate the numbers. 
Senior/disabled property tax freeze favored wealthy. 
Top earners, corporations should pay "fair share". 

John Delaney:
Increase marginal rate, tax investments like income. 

Kamala Harris:
Payments to needy, not tax breaks for the rich. 

Amy Klobuchar:
Changes in corporate tax would fund infrastructure.

Beto O`Rourke:
Wealth tax would generate revenue for 'common benefit'.
Everyone should sacrifice, with higher top marginal tax rate. 

Bernie Sanders:
Raise income tax & fix estate tax: hardly Marxist ideas. 

Elizabeth Warren:
Comparison of Trump wealth tax to Warren wealth tax.
2% wealth tax on assets over $50M; 3% over $1B.
Wealth tax: $4.1 billion per year on fortune of $137 billion.
Curb inequality: 2% tax on assets over $50M; 3% over $1B.
Making housing affordable by raising estate tax. 

Andrew Yang:
Fund programs from tech companies now paying no tax. 

Source: OnTheIssues.org