Accountants in UK provide many services to their esteemed clients. One such service is the self-assessment service. Self-assessment is a form. These forms are sent by companies every year to the revenue and tax departments to report their earning of the year and the sources from which they generated these earnings. In other words it is the form that is used to file income tax. After the tax is calculated it is deducted from the company’s revenue. Accountants assist employers in giving advice on how to file tax returns and save revenue of the business. Few accountants also help filling and submission.