21st Century Investment Act of 2015

[AI summary unavailable — showing source text] 21st Century Investment Act of 2015 Amends the Internal Revenue Code to: (1) make permanent the tax credit for increasing research activities; (2) allow an increased 25% tax credit rate for research expenses incurred in the United States; and (3) increase to 15%, through 2024, the tax deduction for income attributable to domestic manufacturing production activities for which substantially all of the research and development occurred in the United States.…