[Obama's plan for] tax credits will do little or nothing to promote economic growth because they do not reduce marginal tax rates -- the rate on the next dollar of income -- to provide powerful, meaningful incentives for productive activities such as investment, entrepreneurship and work. A tax credit is effectively a cash grant that can only affect incentives up to the amount of the grant. Indeed, such tax credits would likely reduce economic growth because the credits are phased out as income rises, and so effectively impose higher marginal tax rates over those income levels.
Marginal tax rates for middle-income families in the 25% tax bracket are too high.... Reducing the marginal tax rates for these middle-income earners would lead to income increases for middle-income workers, just as reducing excessive marginal tax rates for higher-income workers did, going all the way back to the Kennedy tax cuts of the 1960s.
[A] 40% cut in middle-class income tax rates would provide a powerful boost to the economy, greatly expanding incentives for savings, investment and work. This would be much more effective than Mr. Obama's tax plan with it's $1.3 trillion in redistributive tax credits, as well as yet another so-called stimulus package based on another $300 billion or more in increased government spending.