Compliance
How UK Side Hustlers Can Stay on the Right Side of Self Assessment
With HMRC stepping up reminders on side income and a £1,000 threshold to watch, here's how side hustlers can plan and comply ahead of the 2026–27 tax year.
By NomadicTax Research Team • 5-8 min read • August 23, 2026
## Understanding the £1,000 Trading Allowance and Your Obligations
If you earn **more than £1,000** from extra work—selling crafts, filming weddings, content creation, etc.—you **must register** for Self Assessment and declare all your income for the 2025-26 tax year by **5 October 2026**. ([gov.uk](https://www.gov.uk/government/news/say-i-do-to-getting-your-side-hustle-tax-right?utm_source=openai))
### Example
- You sell handcrafted jewellery and earn **£600**. On the side, you sell photos online for **£500**. Since your combined income is **£1,100**, you need to register. If you sell £700 jewellery only, stay under the threshold and no declaration is required.
Mid-October deadline: register by 5 October; online filing and tax payment due **31 January 2027**. ([gov.uk](https://www.gov.uk/government/news/say-i-do-to-getting-your-side-hustle-tax-right?utm_source=openai))
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## Keeping Records, Declaring Income, and Minimising the Risk
- **Keep detailed records**: invoices, receipts, travel, materials—always separate personal-use expenses from business ones.
- # Use HMRC’s “Where is your additional income from?” tool to figure out whether Self Assessment is needed. ([gov.uk](https://www.gov.uk/government/news/say-i-do-to-getting-your-side-hustle-tax-right?utm_source=openai))
- Include all income in your tax return; not only side hustle profits but interest, dividends, etc.
- You can reduce taxable income using allowable expenses tied to your hustle: materials, equipment, travel, home-office costs when qualifying.
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## Planning Tips: Before Self Assessment and MTD Take Effect
### Self Assessment (2025-26)
- Register by **5 October 2026** if side income crosses £1,000. ([gov.uk](https://www.gov.uk/government/news/say-i-do-to-getting-your-side-hustle-tax-right?utm_source=openai))
- File online by **31 January 2027**, pay any tax due.
### Making Tax Digital for Income Tax (MTD for ITSA)
- **From 6 April 2026**, sole traders and landlords with qualifying income over **£50,000** must use MTD: digital records, quarterly updates, and compatible software. ([gov.uk](https://www.gov.uk/government/collections/making-tax-digital-for-income-tax?utm_source=openai))
- This threshold falls to **£30,000** in April 2027 and **£20,000** in April 2028. ([gov.uk](https://www.gov.uk/government/publications/making-tax-digital-for-income-tax-self-assessment-reducing-the-mandation-threshold-from-30000-to-20000-from-april-2028/reduction-of-the-mandation-threshold-from-30000-to-20000-from-april-2028?utm_source=openai))
### Practical Advice
- Choose software early; many free or low-cost options are now MTD-compatible.
- Use quarterly updates to ease workload and avoid last-minute scrambling.
- Budget for tax payments early; withholding funds monthly helps avoid cash flow issues.
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## What Happens If You Miss Deadlines or Don’t Register
- Penalty points may apply under MTD for late submissions. ([gov.uk](https://www.gov.uk/government/collections/making-tax-digital-for-income-tax?utm_source=openai))
- HMRC may impose interest and late payment penalties if tax due isn’t paid by 31 January.
- Incorrect or missing registrations can lead to fines.
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## Key Takeaways
| Action | Deadline / Requirement |
|--------|-------------------------|
| Register for Self Assessment if side income + other extra income in 2025-26 > £1,000 | 5 October 2026 |
| Use MTD from 6 April 2026 if self-employed or landlord with income > £50,000 | Already in force from that date |
| Threshold changes downward in 2027 and 2028 | £30,000 (2027), £20,000 (2028) |
**Get ahead now:** strong record keeping, timely registration, having compatible software and understanding hike thresholds will keep your side hustle tax-compliant and your risk low.