You have the freedom to submit your self-assessment tax return independently although hiring an accountant both reduces your workload and prevents mistakes in the process.accountant for self assessment help their clients find deductible expenses to save profits while avoiding errors that could result from non-compliance with HMRC guidelines. Members of their team help clients devise professional tax-saving strategies to minimize tax burdens. Professional help through an accountant becomes necessary whenever you have multiple income streams including rental income, investments or being self-employed. Accountants have the ability to prepare correct taxation documents on time because of their experience ensuring no penalties apply to your tax return.