Earning extra money on the side? Here's exactly when you need to tell HMRC, how much tax you'll pay, and how to keep more of what you earn — all explained in plain English.
Side Hustles Are Booming — But So Are Tax Mistakes
More than 1 in 4 UK adults now have some form of side hustle, according to recent surveys. Whether it's selling on eBay, freelancing on Upwork, driving for Uber, renting a spare room, tutoring, or running an Etsy shop — millions of people are earning extra income alongside their main job.
The problem? Most people have no idea when they need to start paying tax on that income, how to report it, or what they can claim back. HMRC has been tightening the rules, and ignorance isn't a defence. Getting it wrong can mean surprise tax bills, penalties, and interest charges.
This guide covers everything you need to know about side hustle tax in the UK for the 2025/26 and 2026/27 tax years.
The Trading Allowance: Your First £1,000 Is Tax-Free
The most important number for side hustlers is the trading allowance. Every UK taxpayer gets a £1,000 tax-free trading allowance per tax year. This means:
The £1,000 applies to your total trading income, not per hustle. If you earn £600 on Etsy and £500 tutoring, that's £1,100 total — you've exceeded the threshold and need to register.
- •If your total side hustle income (not profit, but gross income) is under £1,000, you don't need to tell HMRC anything. No tax return, no registration, nothing.
- •If your total side hustle income is over £1,000, you must register as self-employed with HMRC and file a Self Assessment tax return.
When Do You Need to Register With HMRC?
If your side hustle income exceeds £1,000 in a tax year, you must:
Don't leave registration until the last minute. HMRC can take several weeks to process your registration and issue your Unique Taxpayer Reference (UTR) number, which you need to file your return.
- •Register for Self Assessment at gov.uk/register-for-self-assessment. Do this by 5th October following the end of the tax year in which you started earning. For the 2025/26 tax year (ending 5th April 2026), register by 5th October 2026.
- •File a Self Assessment tax return by 31st January following the end of the tax year. For 2025/26 income, file by 31st January 2027.
- •Pay any tax owed by 31st January as well.
How Much Tax Will You Pay?
Side hustle income is added to your employment income and taxed at your marginal rate. Here are the 2025/26 tax bands for England, Wales, and Northern Ireland:
BandTaxable IncomeRatePersonal AllowanceUp to £12,5700%Basic Rate£12,571 – £50,27020%Higher Rate£50,271 – £125,14040%Additional RateOver £125,14045%Important: Scotland has different tax bands and rates. If you live in Scotland, check the Scottish Income Tax rates, which range from 19% to 48%.
**Example: Basic-Rate Taxpayer With a Side Hustle**Let's say you earn £35,000 from your main job and £5,000 from a side hustle (after deducting the £1,000 trading allowance, your taxable side income is £4,000). Your side hustle income is taxed at your marginal rate:
**Example: Side Hustle Pushing You Into Higher Rate**If you earn £48,000 from your main job and £5,000 from a side hustle (£4,000 taxable after trading allowance):
This is why tracking your total income matters — your side hustle could push you into a higher tax bracket.
- •Total income: £40,000 (still within the basic-rate band)
- •Tax on side hustle: £4,000 × 20% = £800
- •Total income: £53,000
- •First £2,270 of side hustle income taxed at 20% (up to £50,270 threshold) = £454
- •Remaining £1,730 taxed at 40% = £692
- •Total tax on side hustle: £1,146
National Insurance on Side Hustle Income
If your side hustle profits exceed £12,570 per year (the same as the Personal Allowance), you'll also pay Class 2 and Class 4 National Insurance:
For most side hustlers earning a few thousand pounds extra, National Insurance won't apply because your side hustle profits alone are below the threshold. However, if your side hustle grows significantly, factor NI into your calculations.
- •Class 2 NI: £3.45 per week (flat rate) — though this is being reformed and may be changing. Check GOV.UK for the latest.
- •Class 4 NI: 6% on profits between £12,570 and £50,270, and 2% on profits above £50,270.
Expenses You Can Deduct
One of the biggest advantages of registering as self-employed is that you can deduct legitimate business expenses from your income before calculating tax. Common side hustle expenses include:
**For Online Sellers (eBay, Etsy, Amazon)****For Freelancers (Writing, Design, Consulting)****For Gig Economy Workers (Uber, Deliveroo)****The Trading Allowance vs Expenses: Choose One**You can either claim the £1,000 trading allowance OR deduct actual expenses — not both. If your expenses exceed £1,000, it's worth claiming expenses instead. If your expenses are minimal, the flat £1,000 allowance is simpler.
- •Cost of goods sold (materials, stock purchased for resale)
- •Packaging and postage
- •Platform fees and commissions
- •Photography equipment used for listings
- •Storage costs
- •Software subscriptions (Adobe, Canva, etc.)
- •Computer and equipment (proportional if also used personally)
- •Professional development and courses
- •Travel to client meetings
- •Home office costs (simplified expenses: £6/week or £26/month, no receipts needed)
- •Vehicle costs (fuel, insurance, maintenance — proportional to business use)
- •Phone costs (proportional to business use)
- •Protective clothing or equipment
Platform Reporting: What HMRC Already Knows
Since January 2024, digital platforms like eBay, Etsy, Airbnb, Uber, Deliveroo, Vinted, and others are required to report seller income to HMRC. This means HMRC already knows how much you've earned on these platforms.
If you've been earning over £1,000 on selling platforms without declaring it, HMRC can cross-reference their records with your tax returns. The penalty for failing to declare income ranges from 0% to 100% of the unpaid tax, depending on whether HMRC considers the failure careless or deliberate.
The message is clear: if you're earning, declare it. The days of "they won't know" are over.
The Rent-a-Room Scheme: £7,500 Tax-Free
If your side hustle involves renting out a furnished room in your home (via Airbnb or to a lodger), you benefit from the Rent-a-Room scheme. This gives you a tax-free allowance of £7,500 per year — far more generous than the trading allowance.
Key rules:
- •The room must be in your main home (not a second property)
- •It must be furnished
- •The £7,500 is halved if you share the income with someone (e.g., a partner)
- •If you earn under £7,500, you don't need to declare it
- •If you earn over £7,500, you can choose between the Rent-a-Room allowance and deducting actual expenses
Record-Keeping: What to Save and For How Long
HMRC requires you to keep records for at least 5 years after the 31st January submission deadline. This includes:
Use a simple spreadsheet or an app like FreeAgent, QuickBooks Self-Employed, or even a notes app. The format doesn't matter — consistency does. Record transactions as they happen, not in a January panic.
- •All invoices and receipts for income and expenses
- •Bank statements showing business transactions
- •Platform payout reports and statements
- •Mileage logs (if claiming vehicle expenses)
Payments on Account: The Tax Bill Surprise
One nasty surprise for first-time Self Assessment filers: payments on account. When you file your first tax return and owe over £1,000, HMRC may require you to make advance payments towards next year's tax bill. These are due:
This means your first Self Assessment payment can feel like a double bill. Plan for it. When you start earning side hustle income, set aside 25%–30% of your profit in a separate savings account so the tax bill doesn't blindside you.
- •31st January: 50% of next year's estimated tax (alongside this year's full bill)
- •31st July: Another 50% of next year's estimated tax
How to Save Your Side Hustle Tax Money
The smartest side hustlers treat their tax obligation as a saving goal:
Use the SYM app to create a "Tax Fund" savings goal and automate your contributions. There's nothing more stressful than a surprise tax bill — and nothing more satisfying than paying it instantly because you planned ahead.
- •Open a separate savings account — label it "Tax" or "HMRC"
- •Transfer 25%–30% of every side hustle payment into this account as soon as you receive it
- •Don't touch it — this isn't your money, it's the taxman's
- •When the bill arrives in January, the money is already waiting
Common Side Hustle Tax Mistakes
**1. Thinking "It's Just a Hobby"**If you're regularly selling items for profit, providing services for payment, or earning from a platform, it's trading income — regardless of whether you consider it a hobby. The test is whether there's a profit motive and regularity.
**2. Not Separating Business and Personal Finances**Mixing side hustle money with personal spending makes record-keeping a nightmare. Open a separate bank account (even a free one) for your side hustle income and expenses.
**3. Forgetting About Student Loan Repayments**If you're still repaying a student loan, side hustle income can trigger additional repayments. Plan 2 loans are repaid at 9% of income over £27,295. Your combined employment and self-employment income counts.
**4. Missing the Registration Deadline**Register by 5th October after the tax year you started earning over £1,000. Late registration can trigger penalties.
Quick Reference: Side Hustle Tax Checklist 2026
- •☐ Total side income under £1,000? No action needed.
- •☐ Total side income over £1,000? Register for Self Assessment.
- •☐ Decide: trading allowance (£1,000) or actual expenses?
- •☐ Keep all receipts and records for 5+ years.
- •☐ Set aside 25%–30% of profit for tax.
- •☐ File return by 31st January.
- •☐ Pay tax by 31st January.
- •☐ Budget for payments on account if owing over £1,000.
The Bottom Line
Side hustles are a brilliant way to boost your income and accelerate your savings. But the tax rules are real, HMRC is watching (especially platform income), and getting it wrong can cost you.
The good news? The rules are straightforward once you understand them. Earn under £1,000 — no worries. Earn over £1,000 — register, track expenses, set aside tax money, and file on time. Do those four things and you'll never have a tax surprise.
Now get back to hustling — and saving.
Frequently Asked Questions
+
+
+
+
+
#side-hustle#tax#self-employment#uk-finance#hmrc
Start Your Savings Journey Today
20+ savings challenges, daily tracking, and achievement badges -- all free.
Download on the App Store