Find information on key laws and resources for Texans with disabilities who qualify for tax exemptions. Download Form W-4 V: Voluntary Withholding Request from the IRS' website.You must apply to HCAD for any exemptions for which you qualify. Withholding tax, or tax withholding, is what your employer holds from your paycheck and then pays to the IRS on your behalf. Tax withholding is typically made up of federal, state, local and FICA taxes. An original prescription is acceptable proof if not providing a written statement or completing the Disability Statement below. Eligibility for some benefits may depend on residency, military component and Veteran disability status. It is a violation of state law to use the placard or plates for a disabled parking spot without the person with the disability in the vehicle. No longer than 7 business days after the payment is withheld. Mandatory deductions.