"How it used to work: If a company had $1.5 million in revenue and $1 million in expenses (let's say it was entirely domestic R&D), it would pay taxes on its $500,000 profit.
How it works now: In the same example, the company would have to amortize the $1 million in expenses over five years, so it would deduct only $200,000 (one fifth) and would pay taxes on $1.3 million in profit."