Section 2. Persons subject to tax

(a) Imposition of tax. A tax is hereby
  imposed at a rate not to exceed one-half of one  percent  on  the  wages
  earned, and net earnings from self-employment, within the city, of every
  nonresident individual, estate and trust.
    (b)  Exclusion.  (1) In computing the amount of wages and net earnings
  from self-employment taxable under subsection (a) of this section, there
  shall be allowed an  exclusion  against  the  total  of  wages  and  net
  earnings from self-employment in accordance with the following table:
      Total of Wages and Net Earnings
      From Self-Employment                         Exclusion Allowable
      Not Over $10,000                             $3,000
      Over $10,000 But Not Over
      $20,000                                      $2,000
      Over $20,000 But Not Over
      $30,000                                      $1,000
      Over $30,000                                 NONE
    (2)  The  exclusion  allowable shall be applied pro rata against wages
  and net earnings from self-employment.

    (3) For taxable periods of less than one year, the exclusion allowable
  shall be prorated pursuant to regulations of the state tax commission.
    (c)  Limitation.  In  no  event shall a taxpayer be subject to the tax
  under this local law in an amount greater than he would be  required  to
  pay  if  he were a resident of the city and subject to a city income tax
  surcharge on residents of the city  adopted  by  the  city  pursuant  to
  authority granted by article thirty-A of the tax law.