Selling a few things on Vibed or Depop, doing the odd bit of freelance design, dog walking for neighbours, or running a small craft stall at weekends? If you've got a side hustle bubbling away alongside your main job, you've probably wondered whether you need to tell HMRC about it, or whether there's some magic threshold you need to hit before it "counts."
Good news: there is a threshold, and it's called the trading allowance. Let's talk through what it actually means, and when your side income tips over into "you need to register as self-employed" territory.
What Is the Trading Allowance?
The trading allowance is a tax-free allowance that lets you earn a certain amount from self-employment or casual trading before you owe any Income Tax on it. According to [GOV.UK](https://www.gov.uk/income-tax-rates), you get a tax-free allowance for your first £1,000 of income from self-employment, known as your "trading allowance."
This sits alongside your Personal Allowance (the amount of income you don't pay tax on generally, which is £12,570 for most people) and works as a separate pot specifically for trading-type income. There's a similar allowance for property income too, if you're renting out a room or a property, though that's a topic for another day (and a different set of rules).
The key thing to understand: this is £1,000 of income, not profit. So if you sold £900 worth of handmade candles this year, that whole amount typically falls under the allowance and you may not need to pay tax on it or even mention it to HMRC, depending on your circumstances.
Do You Automatically Need to Register as Self-Employed?
This is where a lot of people get tripped up, because "trading allowance" and "registering as self-employed" are related but not quite the same conversation.
Broadly speaking, if your total income from self-employment or casual trading in a tax year is under £1,000, you may not need to tell HMRC or register for Self Assessment at all. HMRC sets out the eligibility rules for this, so it's worth checking your own situation on [GOV.UK](https://www.gov.uk/income-tax-rates) rather than assuming.
Once your income from self-employment goes over £1,000 in a tax year, that's generally the point where things change and you'll likely need to register with HMRC and complete a Self Assessment tax return. This is true even if, once you deduct your expenses, you don't actually end up owing any tax. It's the income figure that matters for deciding whether to register, not necessarily whether you'll owe money at the end.
A Simple Example (For Illustration Only)
Let's say you spend your weekends upcycling furniture and selling it on. Over the tax year, you make £1,400 in sales, with £300 spent on materials and fees.
- Total income: £1,400
- This is over the £1,000 trading allowance
- You'd generally need to register as self-employed with HMRC and file a Self Assessment return
- You could then choose to deduct either the trading allowance (£1,000) or your actual expenses (£300), whichever works out better for you, but not both
This is a simplified example to show how the maths generally works, not a prediction of your own tax bill. Everyone's situation is different, particularly if you have other income, so it's worth checking your specific position.
Why Registering Matters (Even If It Feels Like a Faff)
It's tempting to think "it's only a small amount, surely it doesn't matter." But HMRC takes registration seriously, and there are a few reasons it's worth getting right from the start:
- Avoiding penalties: If you should have registered and didn't, you could face penalties further down the line, especially if HMRC later identifies unreported income.
- National Insurance contributions: Registering as self-employed also affects your National Insurance position. As explained by [GOV.UK](https://www.gov.uk/national-insurance/how-much-you-pay), if your profits are more than £12,570 a year, you pay Class 4 National Insurance contributions, and you may also choose to pay Class 2 contributions, which can help protect your entitlement to certain benefits like the State Pension.
- Peace of mind: Knowing you're on the right side of the rules means one less thing to worry about, and it's much easier to stay organised from the start than to untangle things retrospectively.
What If You're Employed AND Self-Employed?
Lots of people doing side hustles are already employed full-time or part-time elsewhere. This is really common, and the rules do account for it.
If you're employed, your employer deducts Class 1 National Insurance from your wages automatically. If you're also self-employed on the side, you may additionally need to pay Class 4 National Insurance on your self-employed profits. According to [GOV.UK](https://www.gov.uk/national-insurance/how-much-you-pay), how much you pay overall depends on your combined wages and self-employed profits, and HMRC will confirm what's due once you've filed your Self Assessment return.
In short: having a job doesn't exempt your side income from these rules. It's your total picture that matters.
What Counts as "Trading" Anyway?
This is a genuinely tricky grey area, and it's one reason so many people feel unsure. Broadly, the trading allowance and Self Assessment rules apply to income from things like:
- Selling goods you've made or bought to resell
- Freelance or casual services (tutoring, gardening, pet sitting, etc.)
- Occasional gig-economy work
- Content creation, if you're earning money from it
It generally does not apply to simply selling your own unwanted personal possessions occasionally, like clearing out your wardrobe on a resale app. That's not typically considered trading. The difference tends to come down to intention and regularity: are you buying or making things specifically to sell for profit, and are you doing it repeatedly? If so, that starts to look like trading rather than a one-off clear-out.
Because this area can be genuinely nuanced, especially if your side income sits close to the £1,000 line or your circumstances are more complex, it's worth checking HMRC's guidance directly or speaking to a professional. The free, impartial service [MoneyHelper](https://www.moneyhelper.org.uk) can also point you towards the right next steps if you're unsure, and they won't try to sell you anything.
Practical Steps If You Think You Need to Register
If you've worked out that your side income is likely to go over £1,000 this tax year, here's a sensible order of steps:
- Keep records from day one. Track your income and expenses as you go rather than trying to reconstruct everything in January. A simple spreadsheet or budgeting app works fine to start with.
- Register with HMRC for Self Assessment as soon as it becomes clear you'll need to. There are deadlines for registering, so don't leave it too late.
- Set aside money for tax as you earn, rather than spending it all and scrambling later. Many people find it helpful to move a percentage of each payment into a separate savings pot the moment it lands.
- Understand your allowable expenses, because these can reduce your taxable profit, but only if you keep receipts and records to back them up.
- If you're unsure about anything, contact HMRC directly or consider speaking to an accountant, particularly once your side income becomes a meaningful part of your finances.
If you're also trying to get a better handle on your day-to-day money while your side hustle grows, it might be worth reading our Genwel guide on building a simple budget that works around irregular income, since side hustle earnings rarely arrive in neat, predictable amounts.
The Bottom Line
The £1,000 trading allowance is a genuinely useful bit of breathing room for anyone dipping a toe into self-employment or casual selling. It means small amounts of extra income generally don't need to be reported or taxed. But once you cross that £1,000 threshold in a tax year, the general rule is that you'll need to register as self-employed and start thinking about Self Assessment, National Insurance, and keeping proper records.
None of this needs to feel overwhelming. Get into good habits early, keep track of what's coming in and going out, and don't be afraid to ask HMRC or a free service like MoneyHelper if you're not sure where you stand. Side hustles should feel like an opportunity, not a source of stress, and understanding these rules is one of the simplest ways to keep it that way.
