Notice 2020-52 clarifies the requirements that apply to a mid-year amendment to a safe harbor 401(k) or 401(m) plan that reduces only contributions made on behalf of highly compensated employees.  This notice also provides temporary relief in connection with the ongoing Coronavirus Disease 2019 (COVID-19) pandemic from certain requirements that would otherwise apply to a mid-year amendment to a safe harbor 401(k) or 401(m) plan adopted between March 13, 2020, and August 31, 2020, that reduces or suspends safe harbor contributions.  

Notice 2020-52 will be in IRB:  2020-29, dated 07/13/2020.