Side hustle tax rules UK: what you need to know

Side hustles are everywhere: selling on eBay, freelancing, delivery driving, renting a spare room, tutoring or running an Etsy shop.

The problem is that many people are not sure when they need to start paying tax on that income, how to report it or what they can claim. Getting it wrong can mean surprise tax bills, penalties and interest.

This guide covers side hustle tax for the 2026/27 tax year, plus the 2025/26 return that is due by 31 January 2027.

The most important number for side hustlers is the trading allowance: £1,000 of trading income a tax year that you do not pay tax on.

The £1,000 applies to your total trading income, not per hustle. If you earn £600 on Etsy and £500 tutoring, that is £1,100 in total, so you are over the limit.

Selling your own unwanted belongings (for example clothes on Vinted) is not usually trading. Buying things to resell, or making things to sell, is.

If your side hustle income is over £1,000 in a tax year, you need to:

• Register for Self Assessment on gov.uk by 5 October after the end of the tax year in which you started. For 2026/27 (ending 5 April 2027), that means by 5 October 2027. If you started in 2025/26 and missed the 5 October 2026 deadline, register as soon as possible.
• File your tax return by 31 January after the end of the tax year. For 2025/26 income, that is 31 January 2027.
• Pay any tax owed by the same 31 January deadline.

Do not leave registration until the last minute: it can take a few weeks to get your Unique Taxpayer Reference (UTR), which you need to file.

Making Tax Digital for Income Tax applies once your income grows. Since April 2026, sole traders and landlords with combined gross self-employment and property income over £50,000 must keep digital records and send HMRC quarterly updates. The threshold falls to £30,000 from April 2027 and £20,000 from April 2028.

Side hustle profit is added to your other income and taxed at your marginal rate. These are the 2026/27 bands for England, Wales and Northern Ireland:

Scotland has different bands, with rates from 19% to 48%.

Example: basic-rate taxpayer. You earn £35,000 from your job and £5,000 from a side hustle. Using the £1,000 trading allowance, £4,000 is taxable. Your total income is £39,000, still in the basic-rate band, so the tax is £4,000 × 20% = £800.

Example: side hustle pushing you into higher rate. You earn £48,000 from your job and the same £4,000 of taxable side income, so £52,000 in total. The first £2,270 is taxed at 20% (£454) and the remaining £1,730 at 40% (£692), so the tax on your side hustle is £1,146.

Use the take-home pay calculator to see where your job income sits in the bands.

If your self-employed profits are over £12,570 a year, you also pay Class 4 National Insurance. For most people earning a few thousand pounds on the side, this will not apply.

Once you are registered, you can deduct allowable business expenses from your income before tax is worked out. You can either claim the £1,000 trading allowance or deduct actual expenses, not both. If your expenses are more than £1,000, claiming them is usually better; if they are small, the allowance is simpler.

Common side hustle expenses include:

Since January 2024, digital platforms like eBay, Etsy, Airbnb, Uber, Deliveroo, Vinted, and others are required to report seller income to HMRC. Platforms report sellers who make 30 or more sales, or earn more than about £1,700 (€2,000), in a calendar year, so HMRC may already know how much you've earned.

If you've been earning over £1,000 on selling platforms without declaring it, HMRC can cross-reference their records with your tax returns. The penalty for failing to declare income ranges from 0% to 100% of the unpaid tax, depending on whether HMRC considers the failure careless or deliberate.

The message is clear: if you're earning, declare it. The days of "they won't know" are over.

If your side hustle involves renting out a furnished room in your home (via Airbnb or to a lodger), you benefit from the Rent-a-Room scheme. This gives you a tax-free allowance of £7,500 per year, far more generous than the trading allowance.

Key rules:

HMRC requires you to keep records for at least 5 years after the 31 January submission deadline for that tax year. Use a simple spreadsheet or an app such as FreeAgent or QuickBooks: the format matters less than recording things as they happen, not in a January panic. Keep:

One surprise for first-time Self Assessment filers is payments on account. If your tax bill is over £1,000 (and less than 80% of your tax was collected at source, for example through PAYE), HMRC usually asks for advance payments towards next year's bill on 31 January and 31 July, each half of the previous year's bill.

That can make your first payment feel like a double bill. When you start earning side income, set aside 25% to 30% of your profit in a separate savings account so the bill does not take you by surprise.

The smartest side hustlers treat tax as a savings goal from day one. If you prefer to save in small steps, SYM can help you build a daily habit of putting a little aside, so the January bill is already covered.

1. Thinking "it's just a hobby". If you regularly sell things for profit, provide services for payment or earn from a platform, it is likely to be trading income, whatever you call it.

2. Not separating business and personal money. A separate bank account (even a free one) makes record-keeping much easier.

3. Forgetting student loan repayments. Side income can increase what you repay. In 2026/27, Plan 2 loans are repaid at 9% of income over £29,385 and Plan 5 loans at 9% over £25,000, and self-employed income counts through Self Assessment.

4. Missing the registration deadline. Register by 5 October after the tax year in which you went over £1,000. Late registration can lead to penalties.

Side hustles are a great way to boost your income and your savings, but the tax rules are real and HMRC gets data directly from platforms.

The rules are straightforward once you know them. Earn £1,000 or less: usually nothing to do. Earn more: register, keep records, set aside tax money and file on time.