You may complete a new Form IL-W-4 to update your exemption amounts and increase your. Illinois withholding.You received this letter because we determined that you're not entitled to claim exempt status or more than a specified number of withholding allowances. If you received this booklet, you have been identified as potentially eligible for exemptions. If you do not own the property, you must submit documentation showing a legal, equitable, or leasehold interest in the property. A Form W4 claiming exemption from withholding is valid for only the calendar year in which it's furnished to the employer. Link to obtain further information about the various exemptions that are offered, the documents and filing process required for each exemption to be claimed. If you qualify for sales tax exemption, you will be issued an exemption letter. To find out if your corporation may qualify for a tax break, obtain and read the. Internal Revenue Services' (IRS) Publication 557 — Tax-Exempt Status for Your.