Yes, you may need to file a tax return for a side hustle if your income from self-employment or casual trading goes over £1,000 in the tax year. If it is £1,000 or less, the trading allowance may mean there is nothing to report, but you still need to check the exact HMRC rules for your situation.
Do I need to file a tax return for a side hustle?
In many cases, you need to look first at your total side hustle income before expenses, not your profit. The key starting point is the £1,000 trading allowance. If your gross income from trading, freelancing, selling services, or other side hustle work is more than £1,000 in the tax year, that is a sign you may need to register for Self Assessment and declare it to HMRC.
If your side hustle income is £1,000 or less, the trading allowance may cover it fully. That can mean you do not need to pay tax on that income and may not need to file a tax return just because of the side hustle. But this does not cover every case, so it is worth checking with HMRC’s online questionnaire before assuming there is nothing to do.
The £1,000 limit is about income, not profit.
The tax year is 6 April 2026 to 5 April 2027 for the current year.
Side hustle tax is separate from whether your main job already deducts PAYE tax.
You may still need to file for other reasons, even if your side hustle is small.
What is the £1,000 trading allowance?
The £1,000 trading allowance is a tax-free allowance for some trading or casual income. In simple terms, if your total side hustle income is no more than £1,000 in the tax year, you can usually use the allowance instead of reporting and deducting business expenses in the normal way.
If your income is above £1,000, the allowance does not automatically remove the need to deal with HMRC. At that point, you may need to complete a tax return. Depending on your circumstances, you would usually either claim the £1,000 allowance or claim actual allowable expenses. You do not usually claim both against the same income.
This matters because some people assume they only need to tell HMRC once they make more than £1,000 profit. That is not the basic rule. The trigger people usually need to check is whether gross trading income went over £1,000.
What counts as side hustle income for tax?
Side hustle income can include money from freelance work, online selling with a profit motive, tutoring, delivery work, content creation, dog walking, craft sales, design work, repair work, or other paid jobs outside your main employment. The label does not matter much. What matters is how HMRC sees the income.
Some receipts are more likely to be trading income than others. For example, being paid for a service, making items to sell, or regularly buying and selling for profit can all point towards taxable trading income. Selling your own unwanted personal items is different from running a small business, so not every sale is automatically a side hustle for tax purposes.
Because the line can be unclear, HMRC’s checker is useful. You can use the GOV.UK questionnaire to check if you need to pay tax on additional non-PAYE income: https://www.tax.service.gov.uk/guidance/check-non-paye-income/start/how-did-you-receive-additional-income
How do I know if I need to pay tax on my side hustle?
You usually need to pay tax if your total taxable income for the year goes above your available allowances. For many employed people, the side hustle sits on top of salary already taxed through PAYE, so extra profit can fall into basic rate, higher rate, or additional rate tax depending on your total income.
For 2026/27, the Personal Allowance is £12,570, though it starts to reduce once income goes above £100,000. Income tax rates are 20% in the basic rate band, 40% in the higher rate band, and 45% in the additional rate band. If your side hustle is self-employed income, Class 4 National Insurance can also be relevant depending on profit levels, and student loan deductions may also increase if you complete a tax return.
If you already use your Personal Allowance fully against your wages, side hustle profit is often taxed from the first extra pound of taxable profit. That is why two people with the same side hustle income can end up with different tax outcomes depending on their salary, pension contributions, and student loan plan.
How do I register for Self Assessment for a side hustle?
If you need to file, you register for Self Assessment with HMRC and then complete a tax return. The main steps are straightforward, but it helps to do it early so you have time to set up your account, gather records, and understand what information HMRC will ask for.
Check whether your side hustle income means you need to report to HMRC.
Register for Self Assessment through HMRC if required.
Wait for HMRC to issue the details you need to access and file your return.
Keep records of income and allowable expenses for the tax year.
Complete and submit the return, then pay any tax due by HMRC’s deadline.
If you are unsure where to start, HMRC’s side hustle support guide is a useful plain-English resource: https://taxhelpforhustles.campaign.gov.uk/ It explains common situations, what records to keep, and the basics of reporting extra income.
What records do I need to keep for a side hustle?
Keep clear records from the start. That means dates, amounts received, invoices, platform statements, bank records, and receipts for allowable business expenses if you plan to claim them. Good records make it easier to work out whether the trading allowance or actual expenses are better for your situation.
You do not need a complex system. A simple spreadsheet and a separate folder for receipts can be enough for many small side hustles. The key point is that you should be able to explain where your figures came from if asked.
Should I use an accountant for side hustle tax?
You do not always need an accountant, but some people find it helpful. If your side hustle is small and straightforward, you may be comfortable using HMRC guidance and filing yourself. If your income sources are mixed, your expenses are unclear, or you want help getting set up properly, an accountant can save time and reduce admin stress.
When looking for an accountant, focus on whether they regularly handle small self-employed tax returns and side income cases. Ask how they charge, what is included, and whether they will help with registration, bookkeeping basics, tax returns, and dealing with HMRC questions. A clear fixed-fee explanation is often easier to compare than vague pricing.
A small and simple side hustle may be manageable without an accountant.
An accountant may help if you have several income streams or are unsure what counts as an expense.
It is sensible to ask about fees, deadlines, and what support is included.
You are still responsible for checking that your return is accurate, even if someone helps prepare it.
What if I have a job and a side hustle at the same time?
That is common. Your employer usually continues to tax your salary through PAYE, while your side hustle is dealt with separately. The side hustle does not normally go through your payslip in the same way, so you may need Self Assessment to bring everything together.
This can affect your overall take-home pay more than expected, especially if extra profit pushes you further into the basic rate or higher rate bands, or increases student loan repayments. If you want to see how extra income changes your net pay, a salary calculator can help with the employed side of the picture, and then you can compare that with your expected self-employed profit.
What should I do if I am not sure whether I need to file?
Start with HMRC’s own checker and side hustle guide. They are the best first step if you are unsure whether your income is taxable, whether the trading allowance covers it, or whether you need to register for Self Assessment.
If your situation is still unclear after that, an accountant can help you interpret the rules and work out what needs reporting. This article is general information, not regulated financial advice, and the right answer depends on your own income sources and tax position.