Establishments with 250 or more employees in industries covered by the recordkeeping regulation must submit information from their 2016 Form 300A to OSHA by December 15, 2017. These same employers will be required to submit information from all 2017 forms (300A, 300, and 301) by July 1, 2018. Beginning in 2019 and every year thereafter, the information must be submitted by March 2.
Establishments with 20-249 employees in certain high-risk industries must submit information from their 2016 Form 300A to OSHA by December 15, 2017 and their 2017 Form 300A by July 1, 2018. Beginning in 2019 and every year thereafter, the information must be submitted by March 2.
See https://www.osha.gov/injuryreporting/ for more information on electronic reporting, the final rule, and the “Injury Tracking Application”.