Side Hustle Tax in the UK (2026): When You Must Tell HMRC and When You Don’t
Side hustles have become increasingly common in recent years. Many people now earn extra money alongside their main job, whether that’s selling items on platforms like eBay or Vinted, driving for services such as Uber, or running small online ventures in their spare time. As this trend grows, a common question arises: when does HMRC consider side hustle income taxable?
The answer is not always straightforward. Whether tax applies depends largely on what the activity actually involves and why you are doing it.
Selling Personal Items vs Trading
A key distinction HMRC looks at is whether you are simply selling items you already own or whether you are actively trading.
In many cases, people use online platforms to sell things they no longer need. For example, someone might clear out old clothes from their wardrobe on Vinted or sell unwanted household items on eBay. When this happens, HMRC generally does not view the activity as taxable.
This is because the sale is simply a way of recovering some value from personal belongings rather than generating profit through business activity.
Typical examples that are unlikely to be taxable include:
- Selling old clothes that you have previously worn
- Selling personal possessions you no longer need
- Decluttering your home and listing items online
- Occasionally selling second-hand items that were originally bought for personal use
In these situations, the money received is not usually considered trading income.
However, the position changes if there is an intention to make a profit.
When a Side Hustle Becomes Trading
HMRC is more likely to treat an activity as taxable when it resembles a business. One of the clearest indicators is buying goods specifically to sell them on at a profit.
For example, if someone buys products in bulk and resells them online at a higher price, this activity is likely to be viewed as trading. In this scenario, HMRC would expect tax to be paid on the profits generated.
Some indicators that HMRC may consider an activity to be trading include:
- Buying stock with the intention of reselling it
- Selling goods regularly rather than occasionally
- Making a profit from the activity
- Running the activity in a structured or business-like way
- Borrowing money in order to fund the activity
If these factors are present, the income is more likely to fall within the scope of taxation.
The £1,000 Trading Allowance
Even when an activity is considered trading, the amount of profit made still matters.
The UK tax system includes something called the trading allowance, which allows individuals to earn a small amount of trading income tax-free.
Here is how it works:
- If your total profit from trading is less than £1,000 in a tax year, the trading allowance can reduce your taxable profit to zero.
- This allowance effectively acts as a tax-free buffer for small side hustles.
- If your profit exceeds £1,000, you can either:
- Deduct your actual business expenses, or
- Claim the £1,000 trading allowance, depending on which gives the better result.
Because of this allowance, many people with very small side hustles may not end up paying any tax even if their activity technically counts as trading.
The Importance of Intent
Ultimately, the most important question to ask is why the activity is taking place.
If someone is simply selling unwanted belongings to generate a bit of extra cash, HMRC is generally not concerned. But if goods are being purchased with the intention of reselling them for profit, the activity starts to resemble a business.
At that point, the income may fall within the scope of tax rules.
Why This Matters
With more people turning to side hustles to supplement their income, understanding the difference between selling personal items and actively trading has become increasingly important.
While many small activities may fall below the £1,000 trading allowance and result in no tax being payable, the nature of the activity still determines whether it is considered taxable in the first place.
Taking a step back and considering the purpose of the activity — whether it is simply clearing out unused items or deliberately generating profit — can help clarify how HMRC is likely to view it.
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