Gig Worker & Side Hustle Tax Guide UK 2025-26
If your UK side hustle earns more than £1,000 in a tax year, you must register for Self Assessment with HMRC. You pay Income Tax at 20% on profits above the £12,570 Personal Allowance and Class 4 National Insurance at 6% on profits above the same threshold. Below £1,000 gross, the trading allowance means you owe nothing and need not report it.
Key Takeaways
- Trading allowance is £1,000 — earn less than this gross and you owe no tax
- Register for Self Assessment by 5 October after the tax year you exceeded £1,000
- Income Tax: 20% on profits between £12,570 and £50,270
- Class 4 NI: 6% on profits above £12,570 (Class 2 abolished April 2024)
- Car mileage allowance: 45p/mile for first 10,000 miles, 25p/mile after
- Platforms report your earnings to HMRC — accurate returns are essential
What is the £1,000 trading allowance?
The trading allowance lets individuals earn up to £1,000 from self-employment or casual income in a tax year without paying any tax or National Insurance. It covers income from gig platforms, freelancing, selling goods online, renting tools, and similar activities.
The trading allowance means you do not need to tell HMRC about self-employment income up to £1,000 per tax year.
— GOV.UK, Tax-free allowances on trading income
You cannot claim the trading allowance and deduct actual expenses at the same time — you must choose one or the other for a given income source. If your actual expenses are higher than £1,000, claiming expenses will give you a lower tax bill.
| Gross Side Hustle Income | Action Required | Tax Due? |
|---|---|---|
| Up to £1,000 | No reporting needed | None |
| £1,001 – £12,570 | Register Self Assessment, claim trading allowance or expenses | None (within Personal Allowance) |
| £12,571 – £50,270 | Self Assessment + pay tax | 20% IT + 6% Class 4 NI |
| Over £50,270 | Self Assessment + higher rate | 40% IT + 6% NI (to £50,270) |
When must you register for Self Assessment?
You must register for Self Assessment if your gross self-employment income (before expenses) exceeds £1,000 in a tax year. The tax year runs from 6 April to 5 April.
- Register online via GOV.UK Self Assessment registration
- HMRC will send your Unique Taxpayer Reference (UTR) within 10 working days
- Activate your online account using the activation code sent by post
- Submit your tax return by 31 January following the end of the tax year
- Pay any tax owed by 31 January (first payment on account may also be due)
Deadline alert: For the 2025-26 tax year (ending 5 April 2026), you must register by 5 October 2026. Miss this date and HMRC may issue a late registration penalty.
If you were self-employed in a previous year and your income fell below £1,000 in 2025-26, you can de-register — but you still need to submit a return for the year in which you were registered.
How much Income Tax and NI do you pay?
Your side hustle profit is added to any other income (such as employment wages) when calculating your tax band. Both Income Tax and Class 4 National Insurance apply above the Personal Allowance.
| Tax Year 2025-26 | Rate | Threshold |
|---|---|---|
| Personal Allowance | 0% | Up to £12,570 |
| Basic rate Income Tax | 20% | £12,571 – £50,270 |
| Higher rate Income Tax | 40% | £50,271 – £125,140 |
| Class 4 NI (main rate) | 6% | £12,570 – £50,270 |
| Class 4 NI (upper rate) | 2% | Above £50,270 |
You earn £28,000 employed and make £8,000 profit from side hustle work. Total income = £36,000. Your Personal Allowance (£12,570) is used against your employment income. The entire £8,000 side hustle profit falls in the basic rate band. You pay £1,600 Income Tax (20%) and £480 Class 4 NI (6%) on the side hustle — a total extra liability of £2,080. Consider payments on account in January and July.
What expenses can gig workers claim?
If you earn more than £1,000 and choose to deduct actual expenses rather than use the trading allowance, expenses must be wholly and exclusively for business use.
Common allowable expenses
- Mileage: 45p per mile for the first 10,000 miles by car; 25p/mile after that. Bicycle: 20p/mile (relevant for Deliveroo and Bolt Food couriers)
- Phone costs: Business proportion of your mobile bill
- Equipment: Insulated bags, thermal boxes, specialist tools
- Platform fees: Any subscription or commission fees charged by the platform
- Insurance: Business insurance or hire and reward cover
- Accountancy: Costs of preparing your tax return
Mileage allowance — car vs bicycle
| Vehicle | Rate (0–10k miles) | Rate (10k+ miles) |
|---|---|---|
| Car / van | 45p/mile | 25p/mile |
| Motorcycle | 24p/mile | 24p/mile |
| Bicycle | 20p/mile | 20p/mile |
Keep a mileage log with dates, start and end points, and business purpose. HMRC can request evidence going back six years.
What if you have an employed job and a side hustle?
Having both employment and self-employment income is very common in the UK gig economy. Here is how it works in practice:
- Your employer pays Income Tax on your wages through PAYE automatically
- You report your side hustle profit on a Self Assessment return each year
- HMRC combines both income sources to calculate your total tax band
- Any additional Income Tax owed on side hustle profit is paid via Self Assessment
- Class 4 NI is calculated only on your self-employment profit, not your employment wages
If your employment salary already uses your full Personal Allowance of £12,570, then every pound of side hustle profit is taxed at 20% Income Tax plus 6% Class 4 NI from the first pound — a combined rate of 26% on profits up to £50,270.
You can ask HMRC to collect small amounts of tax through your PAYE tax code (by adjusting it), rather than making a lump sum payment in January. This works if your Self Assessment tax bill is under £3,000.
How does HMRC track gig platform income?
From January 2024, digital platforms operating in the UK — including Deliveroo, Uber Eats, Just Eat, Amazon Flex, Etsy, Vinted, and Airbnb — are required to report seller and driver earnings directly to HMRC under rules known as DAC7.
- Platforms submit annual data on users who earn more than 30 transactions or €2,000 equivalent per year
- HMRC cross-references platform data against Self Assessment returns
- Undeclared income may result in a compliance check, penalty, or investigation
- Voluntary disclosure before HMRC contacts you reduces penalties significantly
DAC7 reporting is live: Do not assume cash or platform income goes unnoticed. Platforms are legally required to report. Accurate Self Assessment returns are the safest approach.
How can gig workers pay less tax legally?
There are several straightforward, HMRC-approved ways to reduce your side hustle tax bill.
- Claim all allowable expenses. Most gig workers underclaim mileage. Keep a log and claim every business mile.
- Use the trading allowance wisely. If your expenses are under £1,000, the trading allowance is simpler and equally effective.
- Make pension contributions. Self-employed pension contributions reduce your taxable profit and benefit from tax relief at your marginal rate.
- Contribute to a Stocks and Shares ISA. Returns within an ISA are free of Income Tax and Capital Gains Tax.
- Claim the marriage allowance if your partner earns below the Personal Allowance and you are a basic rate taxpayer.
- Keep records from day one. HMRC requires records for six years. Use a simple spreadsheet or an app like FreeAgent or QuickBooks Self-Employed.
See our full guide: How to pay less tax as a delivery driver — many of the same principles apply to all gig workers.
Frequently asked questions
Do I need to register for Self Assessment for a side hustle?
Yes, if your side hustle income exceeds £1,000 gross in a tax year you must register for Self Assessment. The deadline is 5 October after the end of the tax year — for 2025-26, that is 5 October 2026.
What is the trading allowance for side hustles in 2025-26?
The trading allowance is £1,000 per tax year. Earn £1,000 or less gross and you owe no tax and need not report it to HMRC. Above £1,000, you must register and pay tax on the profit above your Personal Allowance.
How much tax do I pay on side hustle income?
You pay 20% Income Tax on profits between £12,570 and £50,270 and 6% Class 4 NI on the same range. If your total income (employment plus side hustle) stays below £12,570, no tax or NI is due.
Can I claim expenses against my side hustle income?
Yes. If you earn more than £1,000 you can deduct actual allowable business expenses — including mileage, equipment, and phone costs — instead of the trading allowance. You cannot claim both.
Do I pay National Insurance on side hustle income?
Yes — Class 4 NI at 6% on profits above £12,570. Class 2 NI was abolished from April 2024. Your NI is calculated on self-employment profit only, not on your PAYE employment wages.
What is the deadline to register for Self Assessment?
5 October following the tax year end. For 2025-26 (ending 5 April 2026) the registration deadline is 5 October 2026. The return filing and payment deadline is 31 January 2027.
What happens if I earn from multiple gig platforms?
All platform income is combined on one Self Assessment return. The £1,000 trading allowance applies to your total self-employment income, not per platform. HMRC receives earnings data from major UK platforms under DAC7 reporting rules.
Tax compliance specialist since 2017. Helped 5,000+ freelancers and self-employed workers navigate HMRC Self Assessment and UK gig economy tax rules.