Just wanted a little advice about a past due invoice. I maintain a 170 unit complex that has always been a little slow to pay, but now is past due. I have not received a check for December (due in January) and now they also owe for January. My contract states that I will be paid when they receive my invoice. They have never paid before the 15th, but never later than the 21st. I have contacted the management company and was informed that they have a new accounting staff and checks are coming out late. I have no desire to lose any more money and was wondering what your opinion on stopping work at this complex is. Non-payment is a material breach of this contract.