We are a subcontractor in Texas, hired by GC for a bonded job in Houston, Tx, the December bill has not been paid and missed the March 15th deadline. Is it to late to submit a notice? I also have a January invoice that has not been paid. My boss had me bill out the job 100%, plus CO's, and a separate invoice for retainage for March. Can I send a notice for all outstanding billing, or do I have to send a separate one for each month?