Liles Morris

Mastering Self-Assessment in 4 Easy Steps

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'Tis the season, and while many are bustling about preparing for festivities, let's not forget the small yet significant task lingering in the back of our minds—Self Assessment! At Liles Morris, we understand that the complexities of Self-Assessment can be overwhelming. In this blog post, we aim to explain the process and provide you with the knowledge needed to approach your Self-Assessment with confidence.

What is Self-Assessment?

Self-assessment is a system utilised by the government to collect income tax. It means you're in charge of reporting your income, gains, and debts to HMRC. Instead of HMRC doing all the math, you fill out a tax return, provide all the information on your finances, and calculate what you owe. It's a DIY approach that aims for transparency and makes you accountable for getting the numbers right. Regrettably, postponing it might result in penalties!

Understandably, that this process can be daunting for some but breaking it down into manageable steps makes it more approachable.

Step 1: Collect Information

The first and perhaps most important step in the Self-Assessment process is the gathering of accurate and complete information. This includes details about your income, expenses, and any other financial transactions that may impact your tax liability. It's essential to keep detailed records throughout the year to streamline this process.

The documents required are:

  • Income: Collate information on all sources of income, such as employment, self-employment, rental income, and any other relevant earnings.
  • Expenses: Note down allowable expenses related to your employment or self-employment. This can include business expenses, travel costs, and professional fees.
  • Other Income: It is important to account for any additional income streams, such as dividends, interest, and or capital gains from investments.

Step 2: Filling In the Form

Once you have all the required information, the next step is completing the Self-Assessment form. It is very important to not make mistakes when inputting all figures. Also, it is recommended to double-check all calculations to avoid errors that may result in overpayment or underpayment of taxes.

Step 3: Understanding Deductions and Allowances

Do familiarise yourself with available deductions and allowances to legally minimize your tax liability. Common allowances include the Personal Allowance, Marriage Allowance, and Blind Person's Allowance. Understanding these allowances and making the most of them, if applicable, can influence the amount of taxes you owe.

Step 4: Filing and Deadlines

Deadlines are always important, especially when there are penalties associated with it. Meeting deadlines is critical in the world of Self-Assessment. Failure to submit your Self-Assessment on time may result in penalties. Perhaps set reminders for key dates and ensure all required documentation is submitted on time.


Manoeuvering the particulars of Self-Assessment requires thoroughness and an understanding of the tax environment. At Liles Morris, we recognize the challenges one can face in this process and are here to offer help every step of the way. If you have any questions or need assistance with your Self-Assessment, don't hesitate to reach out to our expert team.

Your financial peace of mind is our top priority, and we're delighted to offer an initial 20-minute chat to understand any questions you may have and how we can assist.

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