The financial pressure on US Government is increasing as many big US companies are trying different methods to flee away from paying higher tax bills. They are adopting effective tax rates of 0% or pay much less tax as what is required from them to pay.
Some of the ways which they are following:
Offshore Transfer Payments: Big companies set up their subsidiaries of new ventures in foreign land to purchase material in those countries with very low tax rates.
Accounting rules: For pushing down their corporate and federal taxes, the companies increase the depreciation on capital assets. Also, they augment the severance pay and pension cost to show less annual profit in accounting books.