Side Hustle Tax Rules 2026: What HMRC Now Knows About Your Extra Income

Side hustles have become a significant part of the UK economy — whether it's selling on Vinted, renting a room on Airbnb, freelancing on Fiverr, or running an Etsy shop. The rules around declaring that income have changed materially in 2026, and HMRC's visibility into what you earn has increased substantially.

The Big Change: Digital Platforms Now Report Directly to HMRC

From April 2026, digital platforms operating in the UK are legally required to report your earnings directly to HMRC. This applies to platforms including eBay, Vinted, Etsy, Airbnb, Fiverr, Deliveroo, Uber Eats, and many others.

This is an extension of the OECD's international data-sharing framework. HMRC can now compare what you declare on a tax return with what platforms report you earned. If there's a discrepancy, you may receive a compliance letter.

The £1,000 Trading Allowance

If your total side hustle income in a tax year is £1,000 or less (gross — before expenses), you don't need to declare it or pay tax on it. This is the trading allowance.

If you earn over £1,000, you must register for Self Assessment with HMRC and file a tax return. Critically, this £1,000 threshold applies to your total combined side income — not per platform.

The government has announced that the Self Assessment threshold will eventually rise to £3,000 (expected before 2029), but this hasn't happened yet.

Making Tax Digital (MTD) — April 2026 Launch

From April 2026, individuals with self-employed or property income above £50,000 per year are now required to comply with Making Tax Digital (MTD) for income tax. This means:

• Keeping digital records of income and expenses
• Submitting quarterly updates to HMRC (instead of an annual tax return)
• Using MTD-compatible software

The threshold then drops to £30,000 in April 2027, and £20,000 in April 2028 — meaning this will affect an increasing number of self-employed people and landlords over the next few years.

Tax Rates on Self-Employed Income

Self-employed profits are subject to:

Income Tax:

• Up to £12,570: 0% (Personal Allowance)
• £12,571–£50,270: 20% (Basic rate)
• £50,271–£125,140: 40% (Higher rate)
• Above £125,140: 45% (Additional rate)

Class 4 National Insurance:

• £12,570–£50,270: 6%
• Above £50,270: 2%

So a side hustle earning £5,000 profit above your Personal Allowance (after the £1,000 trading allowance and any expenses) would incur roughly £1,300 in combined tax and NI at the basic rate.

What Counts as a "Deductible Expense"?

You can deduct legitimate business costs from your income before tax. Common examples:

• Fees charged by the selling platform
• Postage and packaging costs
• Raw materials or stock purchased for resale
• Proportion of phone or broadband used for business
• Accountancy fees

Personal use items, food, commuting costs, and HMRC-defined capital items (like equipment over a certain value) have different rules.

The Self Assessment Deadline

The deadline to submit a Self Assessment return online and pay any tax owed for the 2024/25 tax year was 31 January 2026. For the 2025/26 tax year, the deadline will be 31 January 2027. Late filing incurs an automatic £100 penalty, with further charges if you're more than 3 months late.

How Does the UK Compare?

In the US, self-employed workers above $400 in net self-employment income must report to the IRS and pay self-employment tax (15.3% on the first $160,000). The UK's £1,000 trading allowance is comparatively generous, but HMRC's new platform reporting rules close the gap in enforcement. Australia similarly requires reporting all income above AU$18,200 (£9,300), with the ATO receiving data from digital platforms.

Key Numbers

• Trading allowance: £1,000 gross (no tax or declaration needed below this)
• MTD income threshold (2026): £50,000 (falling to £30,000 in 2027, £20,000 in 2028)
• Basic rate tax on self-employed profits: 20% income tax + 6% NI
• Self Assessment deadline (2025/26): 31 January 2027
• Platforms now reporting to HMRC: eBay, Vinted, Etsy, Airbnb, Fiverr and others

Sources

• Side Hustlers Urged to Get Tax Returns Sorted — GOV.UK
• Making Tax Digital for Income Tax — GOV.UK
• Side Hustle Tax UK 2026: HMRC Rules & £1,000 Trading Allowance Explained
• Side Hustle Tax Rules 2026: When HMRC Wants to Know — Taxmo UK
• Side Hustle Tax Rules — Simply Business
• Self Assessment Tax Returns — GOV.UK

Educational content only — not financial advice. Tax rules can be complex — for personal advice, consider speaking to an accountant or using HMRC's free guidance.