An LLC partnership filed it's company taxes by 4/15/2017. One of the partners extended his personal return until 9/15/2017. Originally, when we were given the census information for 2016, the owner stated he would have deferral of $18,000 for 2016. However, we noticed he hasn't yet deposited the contribution. When questioned, owner first said he wouldn't make the contribution, but has now decided he will reflect deferral of $18,000 on his 2016 personal return, and will deposit it by 9/15/2017. Obviously, the deferral is considered late, but should it be declared as a late deposit on the 2016 5500? I am of 2 minds: 1) yes, it should be on the 2016 5500, because it is attributable to the 2016 plan year; 2) no, since the deferral wasn't technically due until 4/15/2017 (date company filed it's return), it won't be on the 2016 5500 as a late contribution, but will be on the 2017 5500 as late. Anyone have a definitive answer, or have an idea of where I can get clarification?
