After five years, the CBO says, the Obama proposals would reduce economic output by between 0.5 percent and 2.2 percent.

Larger deficits caused by the budget would cause the government to issue more bonds, sucking up private capital to finance its debts and thereby reducing the funds businesses could use to expand and hire, the CBO said. An increased tax on capital gains included in the president’s plan would also tend to reduce private capital, it says…

Taking economic effects into account, Obama’s budget could add as much as $3.9 trillion in deficits by 2022, CBO estimates. Slower economic growth tends to increase deficits by reducing tax collection and increasing spending on items like unemployment insurance.