Criteria, procedures for tax assessment, and collection in accordance with the Revenue Code; personal income tax; corporate income tax; value-added tax; specific business tax; stamp duty; custom duty; excise tax; local tax; revenue and expense recognition concepts under the principles of accounting and taxation; preparation of working paper for income tax calculation under the revenue code; adjustment of accounting income to income under the revenue code; accounting for deferred income tax; report preparation relating to tax and filling tax payment forms