when r&d tax credit extension 2015 was passed may 2015
House Passes Permanent Extension of the R&D Tax Credit. 05/22/2015 Â· R&D,Tax Insight. On May 20th, the US House of Representatives passed HR 880, making the Research & Development Tax Credit permanent.ouse Passes Permanent Extension of the R&D Tax Credit. 05/22/2015 Â· R&D,Tax Insight. On May 20th, the US House of Representatives passed HR 880, making the Research & Development Tax Credit permanent.