A substantial number of public companies preparing to implement new lease accounting rules are likely to continue their adoption work even into the first quarter of 2019, after the Jan. 1 effective date.

That would line up with anecdotal observations that companies continued working to implement new rules on revenue recognition even after that standard took effect Jan. 1, 2018. While it may be ideal to have new accounting processes up and running at the start of the reporting period when they take effect, the most critical deadline companies face is their relevant filing date for first-quarter reports, and experts said many companies used that additional time into early 2018.