It all depends on the landlord. Yes in your case it is not alot of money that we are talking about. In your eyes this seems trivial. In the eyes of your landlord it may or may not.
Make no mistake about it, many of the new landlords or property managers you submit applications most likely call your current landlord to check on how things went while you rented. Also the every contract (lease agreement) has their own late fee structure. I am not so sure there is really a standard. For my own rentals the late fee is more then 6%.
As a realtor, I would never advise anyone to violate terms of any contract that they are in.
