Creates the Master Development Plan Recognition Act. Provides that certain contributions made by the State or units of local government are considered made pursuant to a master development plan within the meaning of Section 118 of the Internal Revenue Code of 1986. Amends the Illinois Income Tax Act. Creates a deduction for capital contributions that are made pursuant to a master development plan and that are included in the taxpayer's federal taxable income for the taxable year under Section 118 of the Internal Revenue Code. Effective immediately.