Compliance
Mastering UK Tax for Side Hustles: What You Need to Know in 2026
Running a side hustle is exciting, but the UK tax system has rules that many aren’t aware of—know when you must register, file and pay, and how to stay compliant.
By NomadicTax Research Team • 5-8 min read • August 11, 2026
## What Counts as a Side Hustle Income?
If you run a small business activity—like baking, content creation, event services, or renting out items—and earn income from it, you may have **tax obligations**. Income over **£1,000 per tax year** usually requires classifying the income as trading income. This is measured **net of allowable expenses** like materials, marketing, or travel. ([gov.uk](https://www.gov.uk/government/news/say-i-do-to-getting-your-side-hustle-tax-right?utm_source=openai))
## Do You Need to Register for Self Assessment?
- If your trading income exceeds **£1,000** in a tax year, you should register with HMRC for Self Assessment. ([gov.uk](https://www.gov.uk/government/news/say-i-do-to-getting-your-side-hustle-tax-right?utm_source=openai))
- Registration deadline for the 2025–26 tax year is **5 October 2026**. ([gov.uk](https://www.gov.uk/government/news/say-i-do-to-getting-your-side-hustle-tax-right?utm_source=openai))
- Even if income is below £1,000, keep records—good habit and helps if you cross the threshold. Expenses matter!
## Tax Return, Tax Payments, and Deadlines
- File the Self Assessment tax return by **31 January** following the end of the tax year.
- Pay any tax owed by that same date. Late filings incur penalties, even if you estimate owing nothing.
- Keep reliable records: income, expenses receipts, bank statements. Use accounting software if possible—it simplifies filing.
## How “Making Tax Digital” (MTD) Could Affect You
- From **April 2026**, those with property or self-employment income over **£50,000** must use MTD for Income Tax: quarterly updates via compatible software. ([gov.uk](https://www.gov.uk/government/news/deadline-approaches-for-first-making-tax-digital-quarterly-update?utm_source=openai))
- Thresholds broaden to those over **£30,000 from April 2027**, and **£20,000 from April 2028**. ([gov.uk](https://www.gov.uk/government/publications/extension-of-making-tax-digital-for-income-tax-self-assessment-to-sole-traders-and-landlords/making-tax-digital-for-income-tax-self-assessment-for-sole-traders-and-landlords?utm_source=openai))
## Actionable Tips
- **Estimate in advance**: based on past income, estimate whether you'll exceed £1,000 in trading income. If yes, register early!
- **Choose good software**: especially if you expect to reach MTD thresholds. Several low-cost or free options are HMRC-approved.
- **Tax allowances**: your side hustle income adds to your overall income—check whether that pushes you into higher tax bands, or affects benefits or Student Loan repayments.
- **Seek help if needed**: HMRC has free tools and guides; tax advisers can support especially if your income becomes complex.
## Example Scenario
Jamie sells handmade pottery online:
- Sells 120 pieces in a year, income £900 → under threshold—no need to register or file, but should keep records.
- Then in the same year, starts teaching classes, adds income £2,000 → total side hustle income now £2,900. Jamie must register for Self Assessment, file by 31 January, and likely pay tax on profit after deducting cost of materials and platform fees. If total trading and property income >£50,000, then MTD applies.
**Bottom line:** side hustles are great—but if you think you’ll make more than £1,000 from them in a year, you will need to register and declare. Start early, record everything, and use Digital tools where possible.