Section 51 - Fiscal impact notes on bills affecting political subdivisions1. For the purpose of this section, the term "political subdivision" means any county, city, town, village, special district or school district.2. The legislature shall by concurrent resolution of the senate and assembly prescribe rules requiring fiscal notes to accompany, on a separate form, bills and amendments to bills, except as otherwise prescribed by such rules, which would substantially affect the revenues or expenses, or both, of any political subdivision.3. Fiscal notes shall not, however, be required for bills: (a) subject to the provisions of section fifty of this chapter, or (b) accompanied by special home rule requests submitted by political subdivisions, or (c) which provide discretionary authority to political subdivisions, or (d) submitted pursuant to section twenty-four of the state finance law. 4. If the estimate or estimates contained in a fiscal note are inaccurate, such inaccuracies shall not affect, impair or invalidate such bill.