A Self-Assessment Statement of Account refers to a statement that is issued by the tax administration for the account of certain categories of taxpayers, example the, HMRC in United Kingdom to describe the automatous liability for a specified period of time. It encompasses data like income tax to be paid, amount paid on account and any balance or refund to be allowed. This statement is useful when under the self-assessment system, a taxpayer wishes to monitor his/her liabilities. It is ordinarily filled by people who have some sort of an investment business, or those who receive income from other sources, or those who earn capital gains. This document explains how timely and accurate payment of taxes is made possible in the United States.