Did the new law end the deferral of 100% of gain through like-kinda swaps?

No. It survives, but only for exchanges of real estate not held primarily for sale. So when investment or business real estate is exchanged for similar real property, any gain that would be otherwise be triggered if the property was sold can be deferred. Prior to 2018, this break also applied to like kind swaps of personal property such as heavy equipment, machinery, computers, railroad cars and airplanes.