H.R.2138: To amend the Internal Revenue Code of 1986 to permanently extend the research credit and strengthen the alternative simplified credit for qualified research expenses.

Investment in America Act of 2007 - Amends the Internal Revenue Code to: (1) increase from 12 to 20% the rate of the alternative simplified tax credit for research expenses; (2) make permanent the tax credit for increasing research activities; and (3) repeal the alternative incremental tax credit for research expenses.