The scheme is "aimed at simplifying and reducing the tax burden, encouraging investment and hiring," the Treasury said in a statement.
Tax evasion is a chronic problem in Italy, costing state coffers some 90 billion euros ($95.5 billion) each year, according to the most recent Treasury data.
Looking to overhaul the fiscal system, the bill aims to reduce current income tax bands from four to three within two years, with the final aim of achieving a single tax rate at a later stage, the Treasury said.
The current income tax levy, named IRPEF, is based on rates running from a minimum of 23% on annual income up to 15,000 euros, to a top rate of 43% on income above 50,000 euros.
These so-called "tax expenditures" deprive the state of 165 billion euros in revenues every year, a separate Treasury document showed.