# Do I Need to Tell HMRC About My Side Hustle? You must notify HMRC about your side hustle earnings if your gross annual trading income exceeds £1,000. Learn how the trading allowance works, filing deadlines, and how to stay tax-compliant. **Published:** 2026-07-05 **Updated:** 2026-07-05 **Source:** https://aztajournal.com/gb/tell-hmrc-side-hustle --- > You must tell HMRC about your side hustle once your gross annual trading income exceeds £1,000. Understanding how gross income, the personal allowance, and annual filing deadlines interact ensures you remain fully compliant and avoid penalty charges from HMRC. ## Key Takeaways - The £1,000 trading allowance threshold is based on gross income, which represents your total earnings before any expenses are deducted. - The £1,000 threshold applies to your combined income from all side hustles, rather than being an individual limit for each separate activity. - Registering for Self Assessment does not instantly trigger a tax bill if your total annual income remains below the personal allowance threshold. - For the 2025/26 tax year, you must register by 5 October 2026 and file your online tax return by 31 January 2027 to avoid late penalties. ## Do I need to tell HMRC about my side hustle? You must notify HMRC about your side hustle earnings if your gross trading income exceeds £1,000 during a single tax year. If your total gross income is below this threshold, you do not need to register or pay tax. Under UK tax law, the requirement to register triggers automatically once you pass this statutory limit inside the tax year. It is crucial to monitor your incoming payments closely, as HMRC requires self-registration as a sole trader once your trading activities cross this official threshold. ## What is the £1,000 Trading Allowance? The Trading Allowance is a tax exemption created under the Income Tax (Trading and Other Income) Act 2005 (ITTOIA 2005 s.783AD) that permits individuals to earn up to £1,000 in gross trading income annually without facing tax or reporting requirements. 1. The allowance applies to your total combined gross income across all side hustles, rather than granting a separate £1,000 limit for each individual project. 2. The threshold is calculated strictly using gross income, which means the total money you receive before you subtract any expenses or business costs. 3. You cannot use the £1,000 trading allowance to reduce your taxable profit if you choose to deduct actual business expenses on your tax return instead. ## If I register, do I automatically owe tax? No, registering your side hustle with HMRC does not automatically mean you will owe tax on your extra earnings. Your income only becomes taxable once your total yearly income from all sources exceeds your personal tax-free allowance. The standard personal allowance is £12,570, which is the amount of income you can earn in a tax year before paying income tax. If your combined PAYE job salary and side hustle income stay below £12,570, you will not have any tax to pay despite completing registration. ## What are the side hustle tax deadlines for 2025/26? You must meet several strict, standard holiday and registration dates throughout the year to keep your tax affairs with HMRC fully compliant. Failing to register or file on time can lead to automatic financial penalties. | Required Action | Official HMRC Deadline | | --- | --- | | Register for Self Assessment (if you are a new sole trader) | 5 October 2026 | | File your online Self Assessment tax return | 31 January 2027 | | Pay any income tax and National Insurance owed | 31 January 2027 | ## Are the side hustle tax rules changing to £3,000? No, the rules are not changing to make the first £3,000 of your side hustle income tax-free, as the basic £1,000 threshold remains fully in force for the 2025/26 tax year. A future reform was simply announced in March 2025. The March 2025 government announcement outlined plans to raise the Self Assessment filing threshold to £3,000 at some point before the year 2029. This upcoming change is intended purely as an administrative simplification, permitting people with smaller side incomes to report earnings via a new online option instead of completing a complex full tax return. ### How do I register my side hustle with HMRC? 1. Go to the official services page on GOV.UK and select the option to register for Self Assessment as a sole trader. 2. Create your Government Gateway user ID and password if you do not already have an active personal account. 3. Enter your personal details, National Insurance number, business name, and the exact date that your side hustle officially started trading. 4. Wait for HMRC to process your online registration and post your unique 10-digit Unique Taxpayer Reference (UTR) to your home address. ### Do I have to pay tax on a side hustle if I already have a PAYE job? Yes, if your combined income from your main PAYE employment and your gross side hustle earnings exceeds your personal allowance, you will owe tax. Your employer handles PAYE, but you must report and pay tax on your additional self-employed trading income separately through Self Assessment. ### What happens if I don't declare my side hustle income to HMRC? If you fail to declare your side hustle income once gross earnings pass £1,000, HMRC can issue substantial financial penalties. You will also be charged interest on any unpaid tax from the date it was originally due. ### Can I claim expenses if my side hustle turnover is under £1,000? No, you cannot claim individual business expenses if your total gross turnover is under £1,000. In this scenario, your income is fully covered by the tax-free trading allowance, meaning you have no tax liability to offset with expenses. ### How does HMRC know if I have a side hustle online? HMRC receives regular data directly from popular digital platforms, marketplace apps, and payment processors under standardized reporting rules. They routinely match this financial data against registered Self Assessment records to identify undeclared income.