text: can i charge interest on a mechanics lien? i supplied labor and materials, 14,250.68  for a car lot. could not get paid. he went out of business, wells fargo bought first community bank, league city, texas  w.f. contacted me about lien, wanted to sale. i sent them copy of unpaid bill, and attempts to collect letters. now they wont return my calls. i was going to refile lien with 10% interest. any information will be appreaceated. vernon yes you can charge a late payment fee for all unpaided charges