From the USGA. March 12, 2018.
The following are the main changes to the Rules of Golf taking effect January 1, 2019 that are expected to have the most impact on the game and to be of most interest to golfers. The items covered on this page are organized into eight categories, and within each individual item, you will find the main reasons for the change. If you have any questions, please feel free to contact us any time.