The side hustle economy is booming in the UK. Whether it is selling handmade crafts on Etsy, driving for a ride-sharing service, tutoring in the evenings, renting out a room on Airbnb, or doing freelance design work on weekends, millions of people are earning money outside their main job. And for many, it starts casually enough that tax is not the first thing on their mind.
But HMRC cares about your side income, and the rules about when you need to declare it are more nuanced than most people realise. Here is a practical guide to the tax implications of your side hustle, including the allowances and thresholds that could mean you owe nothing at all.
The £1,000 Trading Allowance
The most important number for casual side hustlers is £1,000. This is the trading allowance, introduced in April 2017, and it works like this: if your total income from self-employed trading activities (before expenses) is less than £1,000 in a tax year, you do not need to tell HMRC about it. No registration, no tax return, no tax to pay.
This covers things like occasional freelance work, selling items you have made, providing services like gardening or tutoring, and other ad-hoc income-generating activities. It does not cover employment income (that is taxed through PAYE) or income from property (there is a separate £1,000 property allowance for that).
If your side income exceeds £1,000, you have two choices: you can either deduct the £1,000 trading allowance instead of your actual expenses (useful if your expenses are low), or you can register as self-employed, file a self-assessment return, and deduct your actual business expenses. Our self-employed tax calculator can help you work out which approach saves you more tax.
When Do You Need to Register as Self-Employed?
If your trading income exceeds £1,000 in a tax year, you must register as self-employed with HMRC by 5 October following the end of that tax year. For example, if you earn £1,500 from freelancing between 6 April 2025 and 5 April 2026, you must register by 5 October 2026.
Registration is free and done online through GOV.UK. Once registered, you will need to file a self-assessment tax return each year, even if your side income goes back below £1,000 in subsequent years (unless you formally deregister).
Being registered as self-employed while also being employed is completely normal — HMRC handles millions of people in exactly this situation. Your employment income continues to be taxed through PAYE, and your self-employed income is assessed through self-assessment. Your personal allowance is applied to your PAYE income first.
How Your Side Income Is Taxed
Your side hustle income is added on top of your employment income for tax purposes. This is where many people get caught out: because your personal allowance and basic-rate band are already being used by your main job, your side income may be taxed at a higher rate than you expect.
For example, if your employed salary is £40,000, you are already using £27,430 of the basic-rate band. That leaves only £22,840 of the basic-rate band for your side income before you hit the higher rate of 40%. If your side hustle earns £25,000, the top £2,160 would be taxed at 40% rather than 20%.
You also need to pay Class 2 National Insurance (£3.45 per week if your profits exceed £12,570) and Class 4 National Insurance (6% on profits between £12,570 and £50,270, plus 2% above that). Use our self-assessment calculator to see the combined tax and NI on your side income.
The £1,000 Property Allowance
Separately from the trading allowance, there is a £1,000 property allowance for income from land or property. This covers things like renting out your driveway, renting a room through Airbnb for a few nights a year, or receiving rent from a storage arrangement.
This is different from the Rent a Room scheme, which allows you to earn up to £7,500 per year tax-free from letting a furnished room in your home. The Rent a Room scheme is more generous but only applies if the lodger shares your home — it does not apply to entire property lets or Airbnb rentals of a whole flat. Our landlord tax calculator can help you work out the tax implications of rental income from property.
Selling Personal Possessions: Usually Tax-Free
There is an important distinction between selling things you own and trading. If you clear out your wardrobe and sell old clothes on eBay, or sell a piece of furniture you no longer need, this is disposal of personal possessions and is generally not taxable. HMRC does not expect you to pay tax on selling your old bicycle or a second-hand sofa.
However, if you are buying items with the intention of selling them at a profit — sourcing vintage clothing at charity shops to resell, buying electronics wholesale to sell on Amazon, or flipping goods from car boot sales — that is trading, and the £1,000 threshold and self-employment rules apply. The test is whether you are engaged in trade, not simply disposing of unwanted items.
For valuable individual items (worth over £6,000), Capital Gains Tax may apply on the disposal. This is rare for typical side hustlers but could be relevant if you sell antiques, art, or jewellery. Our capital gains tax calculator covers these scenarios.
HMRC's Data-Sharing Powers
Since January 2024, HMRC has required digital platforms (including eBay, Airbnb, Etsy, Vinted, Uber, Deliveroo, and others) to report seller data if the seller exceeds 30 transactions or £1,700 in revenue in a calendar year. This means HMRC now has direct visibility into your platform income and can cross-reference it with your tax returns.
This does not mean everyone who sells 30 items on eBay owes tax. As noted above, selling personal possessions is generally not taxable. But it does mean HMRC can more easily identify people who are trading without declaring their income. If you are earning significant sums through platforms and have not registered, now is the time to sort it out before HMRC contacts you.
Practical Steps for Side Hustlers
- Track your income from day one, even if it seems small. A simple spreadsheet is fine
- Keep receipts for any expenses related to your side hustle — materials, tools, software, travel, advertising
- If your income exceeds £1,000, register as self-employed promptly
- Set aside 25–30% of your side income for tax. Our self-employed calculator can give you a more precise estimate
- Consider whether it makes sense to operate as a sole trader or limited company as your side hustle grows
A side hustle can be a fantastic way to earn extra income, develop new skills, or test a business idea. Just make sure HMRC is part of the picture from the start, and you will avoid any unpleasant surprises down the line.