The £1,000 trading allowance
If you have a full-time PAYE job and a side hustle earning even modest income, you may need to register for Self Assessment. The £1,000 trading allowance is the key threshold — under it and you generally don't need to worry; over it and the rules kick in. This guide covers what side-hustle income triggers filing, how to report it, and how to keep the admin light.
The £1,000 trading allowance
If your gross self-employed income (before any expenses) is under £1,000 in the tax year, you generally don't need to register for Self Assessment or file — the £1,000 trading allowance covers it.
Over £1,000: you must register. You then have two options — claim actual expenses to arrive at profit, or claim the £1,000 trading allowance as a flat deduction (whichever produces a lower tax bill).
Combination: you cannot claim the trading allowance AND actual expenses — pick one.
How side-hustle income taxes on top of PAYE
Your PAYE income uses your personal allowance and tax bands as usual. Side-hustle profit stacks on top.
Example: PAYE salary £42,000. Side hustle profit £6,000. Total income £48,000. PAYE tax already deducted on £42k. Side hustle £6,000 falls entirely in the basic-rate band because total income is below £50,270 — so you pay 20% = £1,200 on the side hustle at Self Assessment. Plus Class 4 NI (6% on side hustle above the NI-free threshold, which is often already used by PAYE).
Keeping the admin light
Simple spreadsheet with two columns: income (date, source, amount) and expenses (date, description, amount, receipt reference). Update monthly.
Separate PayPal / Stripe account for side-hustle income makes the records cleaner. Or a separate bank account if handling more than a few clients.
Most side-hustle freelancers can file the short-form SA103S in under an hour, once records are kept.
Worked example
PAYE salary £38,000. Etsy sales gross £4,500. Etsy platform fees + materials £900. Net side-hustle profit: £3,600 (if claiming actual expenses) OR £3,500 (if claiming the £1,000 trading allowance). Actual expenses beat allowance here — file with actual. Total income: £41,600. Personal allowance £12,570 already used by PAYE. All £3,600 taxable at 20% = £720 income tax. Class 4 NI: £3,600 × 6% = £216. Total additional tax from side hustle: £936. Filed with SA103S at year-end.
Reference table
| Side-hustle income | Trading allowance | Filing required? |
|---|---|---|
| £950/year | Covered by allowance | No (unless registered) |
| £1,200/year | Over allowance | Yes — register and file |
| £3,000/year | Consider actual expenses vs £1k flat | Yes |
| £10,000/year | Actual expenses almost certainly better | Yes |
| £40,000+/year | Consider incorporating | Yes — often better as Ltd |
Side-hustle SA checklist
- Track gross income throughout the year
- If gross exceeds £1,000: register for Self Assessment by 5 October
- Track expenses (materials, platform fees, home office proportion)
- Compare actual expenses vs trading allowance annually
- Include income in SA103S self-employment section
- Consider a business bank account or PayPal to separate flows
- Save 25-30% of side-hustle net profit for tax
No — under the £1,000 trading allowance you don't need to register or file, unless you're already SA-registered for another reason.
Selling your own used items (clothes, books, furniture) for less than you paid isn't 'trading'. Selling items you bought specifically to resell (arbitrage) is trading — subject to Self Assessment above £1,000.
Content-creation income counts as self-employment. Above £1,000 gross, register and file.
Total across the tax year is what matters. £3,000 in a single month still counts toward the £1,000 threshold.
Under the cash basis, generally no. Under accrual, sometimes yes but with restrictions. Talk to an accountant if the losses are significant.
Sources & official references
Related on FreelanceToolkit UK
This guide is general information based on UK rules for the 2025/26 tax year. It is not personal tax or legal advice. For decisions affecting your tax position or legal exposure, consult a qualified accountant or solicitor.