and benefit which are the foundations of a special assessment levy. Once a taxpayer has recognized a problem exists, the difference in procedures to appeal a property tax and a special assessment levy makes a special assessment appeal much more difficult. Whereas, ad valorem tax appeals can often be made at a local level without any professional help, special assessment appeals often require the assistance of attorneys, engineers and other consultants. Furthermore, a taxpayer often has the opportunity to protest a property tax assessment annually. In the case of most special assessments, there is usually a very short window of opportunity to appeal and if the window is missed, there can be little recourse available. Of most importance to any property owner who feels aggrieved by a special assessment levy is a legal concept known as a "presumption of validity". This means courts regard the actions of local government units with deference and the courts presume the government unit did everything correctly. At a minimum, any challenge to the special assessment must show the government did not act lawfully. That challenge is significant. For all these reasons, it is critical for any person facing a special assessment levy to participate in public hearings and monitor the special assessment process from its earliest stages. See also Value capture References External links Federal government of the United States Property taxes