HMRC Side Hustle Tax Limit Change: New Rules Explained

HMRC has been quietly watching the millions pulling in even modest sums from side projects — selling crafts online, renting out gear, or doing freelance work. The 2024-2025 tax year just closed, and for up to 300,000 people who earned over £1,000 from their hustle, the Self Assessment deadline of 31 January 2026 is now the deadline that matters.

Side hustle tax threshold: £1,000 · People no longer needing Self Assessment: 300,000 · Announcement date: 11 Mar 2025 · Capital gains on sales exception: £6,000 · Self Assessment deadline reminder: 25 Jun 2025

How much can I earn on a side hustle before paying tax in the UK?

The short answer is £1,000 — but not quite in the way most people assume. The trading allowance means you can earn up to £1,000 from self-employment, casual work, or online sales without paying any tax on it. Earning above that amount doesn’t mean you owe tax immediately; it means you’re required to register for Self Assessment and report the income to HMRC. For the 2024-2025 tax year, the window closed on 5 April 2025, and anyone who crossed that threshold must file their return by 31 January 2026.

Current £1,000 trading allowance

The £1,000 allowance applies to your gross income before expenses — the total from every side hustle combined, not £1,000 per activity. This covers selling handmade goods, digital content creation, freelance services, and even cryptoasset gains from activities that qualify as trading. The allowance does not apply to personal clear-outs or one-off sales of personal items; it targets buying or making things to sell for profit. Property income has a separate £1,000 allowance, and the Rent a Room scheme allows up to £7,500 tax-free if you rent out furnished accommodation.

Changes announced in 2025

The Treasury announced on 11 March 2025 that the reporting threshold for Self Assessment would rise from £1,000 to £3,000 within this parliament. Under this change, up to 300,000 people — mostly self-employed side hustlers — would no longer need to file full Self Assessment returns. An estimated 90,000 of those would owe no tax at all and would have no reporting obligation. The new threshold would align trading income reporting with property and other taxable income thresholds, both of which sit at £3,000.

When Self Assessment is required

Currently, if your side hustle brought in more than £1,000 gross during the tax year, you must register for Self Assessment. HMRC provides a checker tool on GOV.UK to help you determine whether you need to file. New entrants need a Unique Taxpayer Reference before they can submit returns. Early filing is encouraged because it lets you spread payments until the 31 January deadline rather than facing a lump sum all at once.

How to avoid 40% tax UK self-employed?

Reaching the 40% tax band as a side hustler requires combining your trading profits with other income — your employment salary, rental income, or pension contributions. The basic rate band for 2025-2026 sits at £12,570 to around £50,270 before 40% kicks in. Understanding where your total income falls — not just your side hustle in isolation — determines whether you cross into that higher bracket.

Income thresholds for 40% band

Your personal allowance of £12,570 is tax-free across every income source combined. Above that, the basic rate applies up to the higher rate threshold (around £50,270 for most earners in 2025-2026). If your side hustle profits push your total income above that line, the excess gets taxed at 40%. The practical implication: a £5,000 side hustle could push a £45,000 salary earner over the threshold by £2,270 — placing that slice in the 40% band rather than 20%.

Deductions and allowances

The most effective way to keep side hustle income from triggering higher-rate tax is to deduct legitimate business expenses before reporting profits. This includes equipment, software subscriptions, home office costs, and professional insurance. The trading allowance itself provides a £1,000 deduction automatically — if your gross income was £1,500 and you had no other expenses, HMRC treats £1,000 as allowance and you only pay tax on £500 of profit.

Self-employed tax reduction strategies

• Track every allowable expense meticulously — receipts for equipment, travel, and materials add up quickly
• Consider incorporating as a limited company if profits consistently exceed £12,570 — corporation tax sits at 25% on profits above £50,000, which can be more efficient than personal income tax at higher rates
• Contribute to a personal pension to reduce taxable income — pension contributions count against your total income for tax band purposes
• Time your income carefully — if possible, defer invoicing or payments to a tax year where your total income falls below the higher rate threshold

How much can I earn before I pay 40% tax in the UK?

The precise answer depends on your other income sources, but as a general guide, the 40% band starts around £50,270 for most UK employees in 2025-2026. This figure includes your personal allowance of £12,570 plus the basic rate band of roughly £37,700. The threshold shifts slightly each year with the budget, and Scotland sets its bands differently from the rest of the UK.

Personal allowance limits

Your £12,570 personal allowance applies once across your entire income picture — employment, self-employment, rental income, and investments combined. It is not a per-source allowance. If you earn £15,000 from employment and £5,000 from a side hustle, your total income is £20,000, and only £7,430 falls into the taxable range (£20,000 minus £12,570). That £7,430 would be taxed at the basic rate, not the higher rate.

Higher rate tax bands

The basic rate band extends to approximately £50,270. Beyond that threshold, income up to the additional rate cutoff (around £125,140) faces 40% tax. For Scottish taxpayers, the bands differ — the starter rate, basic rate, and intermediate rate sit below the UK higher rate, meaning the threshold for 40% tax in Scotland is typically higher than in England and Wales.

Side hustle impact on total income

Adding side hustle income to a primary salary is where many earners get caught out. If your employment income is already £48,000, a £4,000 side hustle pushes you £1,730 above the higher rate threshold — meaning £1,730 gets taxed at 40% rather than 20%. The marginal difference is significant: that extra £1,730 in side hustle income might only net you around £1,038 after 40% tax, rather than £1,384 if it had stayed in the basic rate band.

How much tax will I pay on £20,000 self-employed in the UK?

Earning £20,000 entirely from self-employment is a useful scenario because it sits entirely within the basic rate band. After the £1,000 trading allowance, you’d be taxed on £19,000 of profit. That translates to £3,800 in income tax at 20%, plus Class 4 National Insurance contributions on profits above £12,570.

Tax and NI calculations

Working through a £20,000 self-employment profit: the first £12,570 of your personal allowance is tax-free. The remaining £7,430 falls into the basic rate at 20%, giving £1,486 in income tax. For National Insurance, Class 4 contributions apply at 9% on profits between £12,570 and £50,270, meaning the £7,430 above the lower limit incurs £669 in NI. Class 2 NI at £3.45 per week also applies for profits above £12,570, adding roughly £179 annually. Your total tax and NI burden on £20,000 self-employment income sits around £2,334.

Allowances applied

Two key allowances reduce your taxable amount. The personal allowance (£12,570) is applied automatically against your total income. The trading allowance (£1,000) deducts directly from your side hustle gross income before calculating profit. If you had £2,000 in allowable expenses, those would also reduce your taxable profit further — turning a £20,000 gross figure into a much lower tax liability.

Using tax calculators

HMRC offers no official side hustle calculator, but the Money Saving Expert calculator and various accounting tools can estimate your liability based on gross income, allowable expenses, and other income sources. Entering your figures before the tax year ends lets you plan cash flow for any payments due on 31 January. Some accountants offer free initial calculators for basic scenarios, while more complex cases involving multiple income streams warrant professional advice.

What is the most overlooked tax break?

The trading allowance itself is frequently missed — HMRC provides it automatically, no claim required, yet many side hustlers don’t realize they can earn up to £1,000 tax-free before any reporting obligation kicks in. Beyond that, allowable expenses are the most underclaimed area. Everything from a proportion of your broadband bill to the cost of relevant training courses, professional memberships, and even a percentage of your rent if you work from home can reduce your tax bill — but only if you track and claim them.

Common deductions for self-employed

• Equipment and tools: laptops, software licenses, specialist equipment for your trade
• Home office: a reasonable percentage of rent, utilities, and internet based on the space you use
• Professional development: courses, books, and subscriptions directly related to your work
• Travel: business-related journeys (not commuting to a fixed place of work)
• Marketing: website hosting, advertising, and promotional materials
• Insurance: professional indemnity, public liability, and business insurance policies

Side hustle specific reliefs

The flat rate expense allowance lets you claim a simplified amount without itemising — currently 5% of gross income can be claimed for some expenses, though this is being phased out in favour of actual expense tracking. If you use your personal vehicle for business, either keep mileage logs for the 45p per mile allowance (up to 10,000 miles) or claim actual fuel costs with records. Home-based side hustlers can claim the £4 per week flat rate for using their home as an office, or calculate a proportion of actual costs.

HMRC guidance on claims

HMRC’s guidance on allowable expenses for self-employment is thorough but dense. The taxhelpforhustles.campaign.gov.uk portal breaks it down in plain language, specifically for side earners. Key rule: expenses must be “wholly and exclusively” for business — HMRC scrutinises mixed-use claims closely. If you’re unsure whether something qualifies, keeping records and consulting an accountant before filing is safer than guessing and facing an enquiry later.

Summary

The UK side hustle tax landscape is shifting, but not all at once. For the tax year that just ended on 5 April 2025, the £1,000 trading allowance and Self Assessment trigger remain unchanged — anyone who earned over that threshold must file by 31 January 2026. The proposed £3,000 reporting threshold, announced in March 2025, could eliminate hundreds of thousands of returns in future years, but the tax-free allowance itself isn’t going anywhere. For side hustlers earning modest amounts, the immediate action is clear: add up your 2024-2025 income, use HMRC’s checker tool, and file early if you crossed the line. For those watching future years, the £3,000 threshold represents meaningful relief — but until the online tool arrives and parliamentary approval is confirmed, the £1,000 rule governs.

Related reading: DWP State Pension Age Change 2026

Frequently asked questions