accept cash for extremely late payment?

[Jared Bonner]

we have a pretty stringent operating plan in place.  we send late notices quickly, and add late fees etc. we have a tenant who has been chronically late, then is VERY late,and  at that last possible moment before we turn over to the eviction attorney ,  he pays.  with all late fees etc.  this is super frustrating.  but we are getting alot of late fees. we also state that we only accept : certified bank check or money order for that last late  payment if it gets to that point.  this time, he called and asked if he could pay cash.  my question:  should we allow this?  any pitfalls to accepting cash under this situation?  thanks all.