A genuine trading side hustle with gross income over £1,000 usually triggers Self Assessment, even if you also have a PAYE job. The threshold uses receipts before expenses. Selling your own unwanted possessions is a different question from buying or making things to sell.
What HMRC means by “more than £1,000”
The figure is usually your turnover before expenses, not profit. If you invoice £1,400 for weekend design work and spend £500 on software, you are still over £1,000 for registration purposes. Expenses may reduce taxable profit later; they do not push you back under the “who must send a return” test once gross income is over the limit.
Example only: you earn £38,000 from employment (taxed through PAYE) and £1,250 from selling handmade goods online before costs. That £1,250 is enough for GOV.UK’s self-employed filing trigger, even if profit after materials is under £1,000.
When a small side hustle may not need a return
If your annual gross trading income from one or more trades is £1,000 or less, GOV.UK’s trading-allowance guidance says you may not have to tell HMRC — unless another rule applies. You may still need to register if, for example, you want to pay voluntary Class 2 National Insurance, claim Tax-Free Childcare based on self-employment, or claim Maternity Allowance on that basis. Use HMRC’s “check if you need to send a tax return” tool when you are unsure.
Other side income that is not “trading”
Not every extra pound is a trade. Rent from a spare room or buy-to-let, tips, untaxed dividends, foreign income or capital gains can each create their own Self Assessment reasons. A side hustle that is clearly self-employment sits under the sole-trader rules; property income is different. If you are mainly letting, read Self Assessment for landlords instead of treating it as trading.
Common mistake
Waiting until January to decide. If you need a return and have not sent one before (or skipped the previous year), GOV.UK expects you to tell HMRC by 5 October after the tax year ends. That is separate from the 31 January filing and payment date. See register by 5 October.
Practical next steps
- Add up gross side income for the tax year, not just what landed in your personal account after costs.
- Keep invoices, platform statements and expense receipts from day one — even while the hustle is small.
- If you are over £1,000, register as a sole trader through Self Assessment and diary the filing deadline.
- If you are near the line, read the £1,000 trading allowance before assuming nothing needs reporting.
TaxSimba’s Self Assessment service is accountant-led: we help gather the side income and employment picture and file correctly. We do not promise a particular tax bill or that every small activity is exempt. If you are ready for help, start Self Assessment with TaxSimba.
Add the platforms before testing the allowance
Illustrative preparation example.
You use two selling apps and also take direct orders. Add the relevant trading receipts before considering the £1,000 allowance; do not test each app as if it were an unrelated personal allowance. Keep sales of your own used possessions identifiable.
Check: Have you separated genuine trade receipts from disposals of personal items?
| Check | Practical action |
|---|---|
| Is the activity trading or something else? | Describe what you sell or do and how the activity operates before applying a trading allowance. |
| What is total gross trading income? | Add relevant trades for the tax year before expenses or platform deductions. |
| Do other reporting reasons apply? | Check property, gains and other untaxed income as well as the side activity. |
Does PAYE mean I cannot need Self Assessment?
No. PAYE covers employment deductions; separate trading income or another tax reason can still require a return.
Do sales of my own used possessions always count as a trade?
No. Disposing of personal items differs from trading. Keep context and check capital-gains rules for valuable items where relevant.
Download a checklist for this guide
- Describe the activity and when it began.
- Total gross receipts across relevant trades.
- Reconcile platform fees and net payouts.
- Keep actual expense evidence for comparison.
- Gather PAYE documents and check registration requirements.