A lot of small businesses do not monitor their accounts receivable line on their balance sheet. If you don't have an accounting system and your monitoring it by hand - dumb. Get a good accounting package that can monitor everything that you bill out. You need to know what clients are sitting out the 0-90-120 days out. If you have money sitting out there you are acting like a bank to your clients. That is not what your business is about. Keep on track in monitoring what is owed and collect.