Milk Import Tariff Equity Act - Amends the Harmonized Tariff Schedule of the United States to impose tariff-rate quotas (quantitative import limits) and provide various duty rates on certain casein, caseinates, milk protein concentrate, and other casein derivatives and glues imported into the United States (except imports from Mexico).
Authorizes the President to: (1) enter into a trade agreement with a foreign country to grant new concessions as compensation in order to maintain the general level of reciprocal and mutually advantageous concessions; and (2) proclaim any necessary modification or continuance of any existing duty, or continuance of existing duty-free or excise treatment, or any quantitative limitation. Sets forth certain limits on the reduction of duties on such products.