2024 26 CFR 1.41-5A – Basic research for taxable years beginning before January 1, 1987

2023 26 CFR 1.41-5A – Basic research for taxable years beginning before January 1, 1987

2022 26 CFR 1.41-5A – Basic research for taxable years beginning before January 1, 1987

2021 26 CFR 1.41-5A – Basic research for taxable years beginning before January 1, 1987

2020 26 CFR 1.41-5A – Basic research for taxable years beginning before January 1, 1987

2019 26 CFR 1.41-5A – Basic research for taxable years beginning before January 1, 1987

2016 26 CFR 1.41-5A – Basic research for taxable years beginning before January 1, 1987

2015 26 CFR 1.41-5A – Basic research for taxable years beginning before January 1, 1987

2014 26 CFR 1.41-5A – Basic research for taxable years beginning before January 1, 1987

2010 26 CFR 1.41-5A – Basic research for taxable years beginning before January 1, 1987

2009 26 CFR 1.41-5A – Basic research for taxable years beginning before January 1, 1987