--- title: "A Sole Trader’s First Tax Return: A UK Case Study for 2026/27" description: Completing your first Self Assessment tax return can feel like a daunting milestone. The forms, the deadlines, and the jargon can be intimidating for any new sole trader. But with a structured approach, the process becomes manageable and clear. This… url: "https://www.accountingfirms.co.uk/knowledge-bank/a-sole-traders-first-tax-return-a-uk-case-study/" updated: "2026-08-11" category: Self Employed Tax --- # A Sole Trader’s First Tax Return: A UK Case Study for 2026/27 Completing your first Self Assessment tax return can feel like a daunting milestone. The forms, the deadlines, and the jargon can be intimidating for any new sole trader. But with a structured approach, the process becomes manageable and clear. This case study follows "Chloe," a freelance graphic designer, as she navigates her first tax return for the 2025/26 tax year. We will walk through each step, from [registering with HMRC](https://www.accountingfirms.co.uk/blog/how-to-start-an-accounting-firm/) to calculating her final tax bill, providing a practical blueprint for any sole trader facing their first filing. #### ## **The Client: Meet Chloe, a Freelance Designer** Chloe started her freelance graphic design business in May 2025. She works from a home office and has several clients. She knows she needs to file a [tax return](https://www.accountingfirms.co.uk/blog/common-bookkeeping-mistakes-to-avoid/) but is unsure about the deadlines, what expenses she can claim, and how to calculate what she owes. - **Business:** Sole Trader, Graphic Design - **Started Trading:** May 2025 (during the 2025/26 tax year) - **Key Challenge:** Completing her first Self Assessment return correctly and understanding her obligations. #### ### **Step 1: Does Chloe Need to File a Tax Return?** The first question every new sole trader must ask is whether they need to file at all. For the 2025/26 tax year, you must register for Self Assessment if your gross income from self-employment is over the **£1,000 trading allowance**. Chloe's income for the year was £45,000, well above the threshold. Therefore, she has a legal duty to register and file a tax return. #### ### **Step 2: Registering for Self Assessment** Before filing, Chloe must register as a sole trader with HMRC. This is a critical step with a strict deadline. - **Action:** Chloe [registers for Self Assessment](https://www.accountingfirms.co.uk/knowledge-bank/registering-for-self-assessment-uk-a-guide/) online via the Government Gateway. - **Deadline:** The deadline for registering is **5 October 2026**, which is 5 October after the end of the tax year in which she started trading. Missing this deadline can result in penalties. - **Outcome:** After registering, HMRC sends Chloe a letter containing her 10-digit **Unique Taxpayer Reference (UTR)**. She needs this UTR to file her return. #### ### **Step 3: Gathering Records - Income and Allowable Expenses** The foundation of any accurate tax return is organised record-keeping. As a sole trader, Chloe must keep records of all her business income and expenses. **Chloe's Income:** - Total invoices issued to clients: £45,000 - **Evidence:** Copies of all invoices, business bank statements showing payments received. **Chloe's Allowable Expenses:** To reduce her taxable profit, Chloe can deduct allowable business expenses. These must be incurred "wholly and exclusively" for the purposes of her trade. | Expense Category | Chloe's Allowable Costs | Notes | | --- | --- | --- | | **Software Subscriptions** | £650 | Adobe Creative Cloud, accounting software, project management tools. | | **Office Costs** | £312 | Simplified flat rate for "use of home" expenses (£26 per month for 101+ hours). | | **Marketing** | £1,200 | Website hosting, business cards, online advertising. | | **Professional Fees** | £400 | Professional body membership, accountant's fees. | | **Hardware** | £1,500 | New laptop (claimed through capital allowances, not as a direct expense). | | **Travel** | £350 | Train tickets to meet clients. | | **Total Expenses** | **£4,412** | This is the total of day-to-day revenue expenses. | Keeping detailed records is a legal requirement. These records can be in any format, but they must be sufficient to calculate the tax due correctly. #### ### **Step 4: The Calculation - Completing the Tax Return** With her records organised, Chloe can now calculate her profit and tax liability. She completes the self-employment pages (SA103) of her tax return. | Calculation Step | Chloe's Figures | | --- | --- | | **Total Income (Turnover)** | £45,000 | | **Less: Total Allowable Expenses** | (£4,412) | | **Taxable Profit** | **£40,588** | Based on this profit, Chloe's tax and National Insurance liability for 2025/26 is calculated. This is her 'self-assessment'. #### ### **Step 5: Filing, Paying, and Looking Ahead** #### **Filing and Paying:** - **Deadline:** Chloe must file her return and pay the tax she owes by **31 January 2027**. - **Method:** She files online using her UTR and Government Gateway account. #### **Looking Ahead: Making Tax Digital (MTD)** Chloe's turnover of £45,000 is below the initial MTD for Income Tax threshold of £50,000 which began on 6 April 2026. However, it is above the next threshold of £30,000, which starts on **6 April 2027**. This means that from April 2027, Chloe will need to: 1. **Keep digital records** of her income and expenses using MTD-compatible software. 2. **Send quarterly updates** of her income and expenses to HMRC directly from her software. 3. **Submit a final tax declaration** for the year through her software. While she can still use spreadsheets, she will need 'bridging software' to connect them to HMRC's systems. #### ## **Key Takeaways from a Sole Trader's First Tax Return** Chloe’s journey highlights the essential steps for any new sole trader: - **Check if you need to file:** If your gross income exceeds £1,000, you must register. - **Register on time:** Do not miss the 5 October deadline. - **Keep meticulous records:** This is your evidence for all income and expense claims. - **Understand allowable expenses:** Only claim for costs that are wholly and exclusively for your business. - **Meet the deadlines:** File and pay by 31 January. - **Prepare for digital:** Be aware of the upcoming Making [Tax Digital requirements](https://www.accountingfirms.co.uk/blog/helping-accounting-clients-move-to-the-cloud/) and choose compatible software. Filing a first tax return is a learning process. By staying organised and understanding the rules, any sole trader can confidently manage their tax obligations.   *For detailed guidance, it is advisable to review HMRC’s [Business Income Manual](https://www.accountingfirms.co.uk/blog/tax-deductions-for-businesses-is-the-remuneration-excessive/) and the latest information on Self Assessment and Making Tax Digital on GOV.UK.* ## ## References 1. [Understanding how Making Tax Digital could support self-employed individuals on lower incomes with their Income Tax obligations, Extract 48](https://www.gov.uk/government/publications/understanding-how-making-tax-digital-could-support-self-employed-individuals-on-lower-incomes-with-their-income-tax-obligations/understanding-the-potential-impacts-of-making-tax-digital-on-self-employed-individuals-with-income-between-10000-to-30000#:~:text=declaration,%20%E2%80%9CIf%20there%E2%80%99s%20no&text=declaration,to%20meet%20their&text=be%20less%20confident,%20%E2%80%9CIf%20there%E2%80%99s%20no&text=be%20less%20confident,to%20meet%20their) 2. [Business Income Manual - BIM86088 - Example: Individual with income fluctuating around TMIA limit at 1](https://www.gov.uk/hmrc-internal-manuals/business-income-manual/bim86088#:~:text=Business%20Income%20Manual%20BIM86088%20%2D,the%20following%20year%20he%20can&text=Business%20Income%20Manual%20BIM86088%20%2D,over%20%C2%A31%2C000%20in&text=Example,the%20following%20year%20he%20can&text=Example,over%20%C2%A31%2C000%20in) 3. [VAT Traders’ Records Manual - VATREC2040 - The obligation to keep records: The trader’s business and accounting records at 1](https://www.gov.uk/hmrc-internal-manuals/vat-trader-records/vatrec2040#:~:text=VAT%20Traders%E2%80%99%20Records%20Manual%20VATREC2040,%20Previous%20page%20Next%20page&text=VAT%20Traders%E2%80%99%20Records%20Manual%20VATREC2040,records%20in%20Notice&text=%2D%20The%20obligation,%20Previous%20page%20Next%20page&text=%2D%20The%20obligation,records%20in%20Notice) 4. [Record keeping (VAT Notice 700/21) at 3](https://www.gov.uk/guidance/record-keeping-for-vat-notice-70021#:~:text=required%20by%20the%20VAT%20rules,you%20must%20keep%20all%20your&text=required%20by%20the%20VAT%20rules,Keeping%20records%20Generally%2C&text=%E2%80%94%20most%20commercial,you%20must%20keep%20all%20your&text=%E2%80%94%20most%20commercial,Keeping%20records%20Generally%2C) 5. [Customs and Excise Management Act 1979, s 118A](https://www.legislation.gov.uk/ukpga/1979/2/section/118A) 6. [Business Income Manual - BIM37005 - Wholly and exclusively: topics covered at 1](https://www.gov.uk/hmrc-internal-manuals/business-income-manual/bim37005#:~:text=the%20expenditure%20incurred%20by%20a,there%20is%20a%20specific%20statutory&text=the%20expenditure%20incurred%20by%20a,%20Unless&text=trader%20is%20allowable,there%20is%20a%20specific%20statutory&text=trader%20is%20allowable,%20Unless) 7. [Corporation Tax Act 2009, s 54](https://www.legislation.gov.uk/ukpga/2009/4/section/54) 8. [Business Income Manual - BIM47820 - Specific deductions: use of home: specific expenses at 1](https://www.gov.uk/hmrc-internal-manuals/business-income-manual/bim47820#:~:text=Business%20Income%20Manual%20BIM47820%20%2D,appropriate%20part%20of%20the%20premium&text=Business%20Income%20Manual%20BIM47820%20%2D,%20Otherwise%2C%20an&text=Specific%20deductions,appropriate%20part%20of%20the%20premium&text=Specific%20deductions,%20Otherwise%2C%20an)