Wall Street's love of tax cuts drives Dow to 25,000 mark

It's easy to see why investors like the tax overhaul: Businesses will benefit from a steep cut in the corporate tax rate. They'll also be able to fully deduct the cost of major purchases from their taxable income, reducing the amount they owe. And companies with large stockpiles of cash overseas can bring the money back to the United States at new, lower rates.

All told, Wall Street analysts estimate the tax package should boost earnings for companies in the Standard & Poor's 500 index by roughly 8 percent this year. That's much more generous than the average tax cut of 1.6 percent that middle-class families will receive, according to the Tax Policy Center.