The UK side hustle economy is booming – with 1 in 4 Brits now earning extra income through TikTok, Etsy, Vinted, freelancing, or delivery apps (ONS, 2025).
But as this trend grows, HMRC is watching more closely than ever. The good news? With the right knowledge (and support), staying compliant and avoiding penalties is simple.
Do You Need to Declare Your Side Income?
If you make over £1,000 a year from side gigs (your Trading Allowance), you must:
- Submit a Self Assessment tax return (deadline: 31 Jan 2026)
- Pay Income Tax (20%–45%)
- Pay National Insurance if self-employed
- Track expenses to legally reduce your tax bill
Example:
Earned £6,000 freelancing?
- £1,000 Trading Allowance
- £1,200 expenses
You’re taxed on £3,800 — not the full £6,000.
Common Side Hustle Tax Mistakes (and How to Avoid Them)
- “HMRC won’t notice…”
- From 2025, platforms like Etsy, Uber, Vinted, and Depop will report your earnings directly to HMRC.
- Mixing business and personal accounts
- Using your personal PayPal for sales is messy (and risky). Open a separate account for side hustle income.
- Forgetting about other taxes
- Renting a room? That’s property income, not covered by the £1,000 Trading Allowance.
- Selling crypto or NFTs? You may owe Capital Gains Tax.
see also 🔗 Reporting rules for digital platforms (Gov.uk)
Smart Tax Moves for Side Hustlers
- Use tools like QuickBooks or FreeAgent to track income and expenses
- Set aside 25–30% of earnings for tax to avoid nasty surprises
- Unsure if you’re “self-employed”? We can help you check
Haven’t Declared Past Income? Don’t Panic.
If you’ve earned side income in previous years and haven’t declared it, HMRC’s Digital Disclosure Service lets you report it voluntarily with lower penalties.
Delay too long, and you could face fines up to 100% of the unpaid tax.
How Friendly Assist Accountancy Can Help
We make side hustle tax simple. Our team will:
- Answer your questions and explain what counts as taxable income
- Handle Self Assessment tax returns from just £89/year
- Provide specialist support for creators, gig workers, and crypto traders
Not sure if your side hustle is taxable?
Let’s talk — your first telephone consultation is free.
Ready to Take Control of Your Side Hustle Tax?
Whether you’re flipping vintage clothes, selling handmade crafts, or growing a TikTok brand, the earlier you get tax-ready, the easier it is to stay compliant — and keep more of what you earn.
Get Our Free Side Hustle Tax Checklist
Join our free mailing list and receive a one-page checklist covering:
- The 5 key deadlines every side hustler needs to know
- What you can and can’t claim as expenses
- How to prepare for HMRC’s new 2025 reporting rules
Contact Steffen at Friendly Assist Accountancy
Frequently Asked Questions
1. Do I need to tell HMRC about my side hustle if I earn less than £1,000?
No — if your total income from self-employment is under £1,000 in a tax year, it’s covered by the Trading Allowance and doesn’t need to be reported.
2. What happens if I don’t declare my side income?
You could face penalties, interest on unpaid tax, or investigations. It’s best to disclose voluntarily via the Digital Disclosure Service if you’re behind.
3. Can I deduct expenses from my side hustle income?
Yes — you can claim costs directly related to your work, such as materials, platform fees, equipment, or part of your home office costs.
4. Do I need to register as self-employed?
If your side hustle income is regular and ongoing, HMRC usually considers you self-employed — even if it’s part-time. We can help confirm your status.