2024 26 CFR 1.41-4 – Qualified research for expenditures paid or incurred in taxable years ending on or after December 31, 2003

2023 26 CFR 1.41-4 – Qualified research for expenditures paid or incurred in taxable years ending on or after December 31, 2003

2022 26 CFR 1.41-4 – Qualified research for expenditures paid or incurred in taxable years ending on or after December 31, 2003

2021 26 CFR 1.41-4 – Qualified research for expenditures paid or incurred in taxable years ending on or after December 31, 2003

2020 26 CFR 1.41-4 – Qualified research for expenditures paid or incurred in taxable years ending on or after December 31, 2003

2019 26 CFR 1.41-4 – Qualified research for expenditures paid or incurred in taxable years ending on or after December 31, 2003

2016 26 CFR 1.41-4 – Qualified research for expenditures paid or incurred in taxable years ending on or after December 31, 2003

2015 26 CFR 1.41-4 – Qualified research for expenditures paid or incurred in taxable years ending on or after December 31, 2003

2014 26 CFR 1.41-4 – Qualified research for expenditures paid or incurred in taxable years ending on or after December 31, 2003

2010 26 CFR 1.41-4 – Qualified research for expenditures paid or incurred in taxable years ending on or after December 31, 2003

2009 26 CFR 1.41-4 – Qualified research for expenditures paid or incurred in taxable years ending on or after December 31, 2003.