This becomes a business decision. Is this really a "valuable client" or not? Have you talked to them? Do they have a cash flow issue? Set them up on a payment plan?  Have them  put the shoe on other foot and ask them how they would feel it takes more than 30 days to get paid? E-mail, phone call, certified return receipt letter.. As a last resort.. Only if you don't get paid bring up the issue of small claims court. Is small claims worth the time and hassle? Good luck Brian Novy cell xxx-xxx-xxxx commercial real estate broker 30 years native Austinite