Under the boycott provisions, penalties include a reduction of foreign tax credits, an increase in taxable income for Controlled Foreign Corporations under subpart F, and a reduction in benefits otherwise allowed regarding Foreign Sales Corporations (FSC's) and Interest-Charge Domestic International Sales Corporation (ICDISC
's), as applicable.
can defer the tax on a portion of its income, but must ultimately pay the deferred tax plus interest.
 Starting with 1985, "number of returns" excludes taxable farmers' cooperatives; starting with 1987, Real Estate Mortgage Investment Conduits (REMIC's); and, starting with 1988, Foreign Sales Corporations (FSC's) and Interest-Charge Domestic International Sales Corporations (ICDISC
In addition, returns for corporations designated as "former DISCs" or "former ICDISCs
" were excluded.