How Accountants Simplify Self-Assessment Filing? Tips For Working With Your Accountant

Completing a Self Assessment tax return can sometimes feel complicated for many UK taxpayers. Gathering financial records, checking tax calculations, identifying allowable expenses, and meeting HMRC deadlines require time and attention to detail. To make it easier and smoother, you can hire an accountant for self-assessment. They can help simplify the process by organising financial information, preparing the relevant figures, and ensuring HMRC compliance. Let’s understand how accountants simplify self-assessment filing in detail. 

What Is Self Assessment? How Self Assessment Accountant UK Help?

In the UK, HM Revenue and Customs (HMRC) uses the Self Assessment system for collecting Income Tax. A taxpayer may need to submit a tax return if they are self-employed and earned more than £1,000 before tax reliefs, are a business partner, or have certain untaxed income. 

Additionally, HMRC provides an online checker for taxpayers if they are unsure whether they need to file. An accountant can also help to determine what needs to be reported and complete the relevant sections of the return. 

How Accountants Simplify Self-Assessment Filing

Working with an accountant offers several benefits, and one of the key advantages is that they simplify self-assessment filing. They do so by practising the following methods:

Organise Your Financial Records

One of the first steps in preparing a Self Assessment tax return is collecting financial records. You must keep records needed to complete a correct and complete return. Generally, you need records of business income and expenses, as well as relevant personal income. 

Identify Allowable Expenses

You must correctly identify allowable business expenses because it is an important part of preparing a Self Assessment return. Keep in mind that not every business cost is deductible. Some expenses have specific tax rules, particularly where there is both business and personal use. 

An accountant can help identify allowable expenses and reduce the risk of passing over deductions or claiming expenses incorrectly.

To know more details on how accountants simplify self-assessment filing, visit the official HMRC website. 

Prepare the Tax Return Accurately

You can file online where eligible, and may use an accountant to help prepare and submit your return. An accountant can check figures and highlight information that may need clarification. However, you remain responsible for providing complete and accurate information, even when using an accountant.

Navigate HMRC Self Assessment Deadlines

Late filing or payment can result in penalties and interest, and that is why meeting Self Assessment deadlines is important. An accountant can help you organise records, prepare your return and ensure it is submitted and paid promptly.

Self Assessment tax return deadlines for the 2025–26 tax year are mentioned in the table below:  

Acting as Your Authorised HMRC Agent

You can hire an accountant or tax adviser to deal with HMRC on your behalf. Depending on the authority given, your agent can communicate with HMRC and submit returns and access relevant tax information on time. 

For an HMRC compliance check, separate temporary authorisation may be required. The taxpayer remains legally responsible for their tax affairs and should ensure the information provided to HMRC is complete and accurate. 

How Accountants Simplify Self-Assessment Filing And Making Tax Digital for Income Tax 2026?

From 6 April 2026, Making Tax Digital (MTD) for Income Tax applies to UK landlords and sole traders with qualifying income over £50,000. If you qualify for MTD rules, you must keep digital records and send quarterly updates to HMRC using compatible software. 

An accountant can help set up compatible software, organise digital records and ensure you submit quarterly updates correctly and on time. Under MTD for Income Tax, HMRC will not issue penalty points if you are late with your quarterly updates during the 2026–27 tax year as part of a soft-landing grace period. However, points-based penalties for late quarterly updates will apply from the second year. 

How to File a Self Assessment Tax Return? 

Now that you know how accountants simplify self-assessment filing, let’s understand how to file a self assessment tax return.

You can file your Self Assessment return online. However,  paper returns are also available. Most people already file online, and online returns can be saved and completed later. 

The general process for filing a self-assessment tax return is: 

1. Check whether you need to file a tax return. 
2. If you need to file a tax return, register for Self Assessment.
3. Gather all your income and expense records.
4. Complete and check the relevant sections.
5. Submit your tax return and review your tax calculation.
6. Pay any tax due by the deadline.

Although you can file your tax return yourself, an accountant can help prepare and submit the return on your behalf more accurately if appropriately authorised.

How Accountants Simplify Self-Assessment Filing and Identify Business Expenses?

Allowable business expenses are a crucial part of a self-assessment return. Remember, not every business cost is deductible. The tax treatment can depend on the nature and circumstances of the expense. 

An accountant can help you identify potentially allowable expenses, check how expenses have been recorded, deal with expenses involving both business and personal use, and maintain appropriate supporting records. They ensure that eligible expenses are claimed correctly without claiming costs that are not allowable under HMRC rules. 

What Happens If I File My Self Assessment Late?

HMRC can charge an initial £100 late-filing penalty for filing your self-assessment late. It is then followed by daily penalties and further penalties if the return remains outstanding. The exact consequences depend on how late the return is and the circumstances.

Final Thoughts on How Accountants Simplify Self-Assessment Filing 

Self-assessment can be easier for you if your financial records and deadlines are organised in advance. An accountant can help review records, check expenses, prepare tax calculations and submit the return on time, where authorised.

Moreover, if you are required to use MTD for income tax, an accountant can help with digital records, quarterly updates and the tax return using compatible software. Even though you are hiring an accountant for self-assessment, you must provide complete and accurate information.

Need Self Assessment tax return help? AccountingFirms is here to help. Our platform has qualified accountants who can help you with your self-assessment tax returns. You can find them by qualification, location, industry, or software, compare, and then choose one who suits best for your business. 

Disclaimer: The information provided on AccountingFirms.co.uk is for informational purposes only and should not be considered as financial advice. Always consult with a professional accountant to ensure compliance with UK laws and regulations.