Summary of Illinois Notice of Intent to Lien requirements for Illinois construction projects including free forms, FAQs, resources, and more. Remember to use the correct form, fill it out accurately and completely, sign it, and record it with the county recorder's office.This page breaks down the rules, requirements, and deadlines you need to follow to file an Illinois mechanics lien. Forms on this website are PDFs with fillable fields. Forms should be downloaded to your computer before filling in the fields. Complete Sections 5 through 7 and a Form SF-1199A, "Direct Deposit Sign-up". Forms on this website are PDFs with fillable fields. Forms should be downloaded to your computer before filling in the fields. Looking for U.S. government information and services? Form 1040-ES (NR) and its instructions for more information on completing the voucher and when estimated tax payments are.