Side Hustle / Trading Allowance Calculator

Calculate tax on side hustle income. Use the £1,000 trading allowance or claim actual expenses.

Source: GOV.UK — Set up as a sole trader

Konstantin Iakovlev

By Konstantin Iakovlev · Founder, Calks.uk

Last updated: · Verified against HMRC and GOV.UK 2026/27 rates

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Disclaimer

This calculator is provided for informational purposes only and should not be considered as financial or tax advice. All calculations are performed locally in your browser — no personal data is collected or sent to our servers. Rates and thresholds are sourced from HMRC and GOV.UK and are updated for the current tax year. Always verify results with HMRC or consult a qualified professional before making financial decisions.

How It Works

Income from a side hustle is taxable if it exceeds the £1,000 trading allowance. Below this threshold, you do not need to declare it or register for Self Assessment. Above £1,000, you must register as self-employed with HMRC, file a Self Assessment tax return and pay income tax and Class 4 National Insurance on your profits.

You can choose to either deduct the £1,000 trading allowance from your gross income or deduct your actual expenses instead — whichever gives a lower taxable profit. For side income with minimal expenses, the trading allowance is usually more beneficial. Separate property income allowance of £1,000 also exists for rental income.

Tax on side income is calculated at your marginal rate, which depends on your total income from all sources. If your day job already uses your basic-rate band, side hustle profits may be taxed at the higher rate of 40%. Class 4 NI is 6% on profits between £12,570 and £50,270, then 2% above that.

Trading allowance — £1,000/year tax-free. All UK adults can earn up to £1,000/year from trading/self-employment WITHOUT declaring to HMRC or paying tax. Covers: eBay/Vinted/Depop selling NEW items for profit; freelance work; tutoring; dog walking; gardening; selling crafts; rental income up to £1,000 not via main residence. Above £1,000: must register self-employed with HMRC by 5 October following tax year. Casual/occasional sales of OWN second-hand items: not trading, no tax (Vinted clear-out sale).

When to register self-employed. Threshold: trading income £1,000+/year. Deadline: 5 October following the tax year in which you crossed threshold. Sample: earn £1,500 from side hustle in 2025/26 (April-April) → register by 5 Oct 2026; file Self Assessment by 31 Jan 2027 paying tax owed. Penalty for late registration: £100 + late filing penalties cascade. Easy registration: gov.uk/register-for-self-assessment (10-minute form). HMRC sends UTR number 2-4 weeks. Then annual Self Assessment.

Tax rates on side hustle income. Income tax bands apply (combined with main job): 0% to £12,570 Personal Allowance (most used by main job); 20% basic rate above; 40% higher rate above £50,270; 45% additional rate above £125,140. Side hustle income added to top of total income. Sample: £40,000 employment + £8,000 side hustle profit = £48,000 — all side hustle within basic rate band. £45,000 employment + £8,000 side hustle = £53,000 — first £5,270 of side hustle at 20%, remaining £2,730 at 40%. Class 4 NI 6% above £12,570 self-employed profit.

VAT registration trigger for side hustles. Mandatory VAT registration: turnover £90,000+/year (2026 threshold, raised from £85k in April 2024). Voluntary registration: any level. Side hustles rarely hit £90k unless ramping up. If approaching: register before turnover crosses threshold. Trading allowance doesn't apply to VAT (£1,000 trading allowance is income tax only). Most side hustlers stay well under VAT threshold — VAT compliance costs (Making Tax Digital, quarterly returns) onerous for small businesses.

HMRC's data matching — they ARE watching. Since 2024, HMRC receives data automatically from: eBay, Etsy, Vinted, Airbnb, Uber, Deliveroo, OnlyFans, Patreon, Twitch, YouTube, Just Eat. Sellers crossing 30 sales/year OR €2,000/year on platforms get reported. HMRC matches against tax returns — undeclared side hustles increasingly investigated. Penalty: up to 100% of tax owed PLUS interest PLUS criminal prosecution for serious cases. Best practice: declare ALL trading income above £1,000 trading allowance — easy and avoids massive penalties.

Example: £8,000 side income, £2,000 expenses, £35,000 day job

  1. Side income: £8,000, Expenses: £2,000
  2. Option A (trading allowance): £8,000 − £1,000 = £7,000 taxable
  3. Option B (actual expenses): £8,000 − £2,000 = £6,000 taxable
  4. Best option: B (actual expenses) — saves tax on £1,000
  5. Tax on £6,000 at 20%: £1,200 + Class 4 NI (6%): £360 = £1,560

Source: GOV.UK — Set up as a sole trader

Frequently Asked Questions

Do I need to declare side hustle income?
If trading income exceeds £1,000/year (Trading Allowance): YES. Register self-employed with HMRC by 5 October following the tax year. File Self Assessment by 31 Jan following tax year, pay tax owed. Penalty for late registration: £100 + late filing penalties cascade up to £1,600+. Selling own second-hand items (clearout): not trading, no tax. Selling NEW items for profit (eBay/Vinted/Depop/Etsy): trading. Freelance work, tutoring, gardening: all count toward £1,000 allowance.
HMRC's new reporting from platforms.
Since 2024, HMRC receives automatic data from: eBay, Etsy, Vinted, Airbnb, Uber, Deliveroo, OnlyFans, Patreon, Twitch, YouTube, Just Eat. Triggers: 30+ sales/year OR €2,000+/year on platforms. HMRC cross-references against tax returns. Undeclared side hustles increasingly investigated and penalised. If you traded above Trading Allowance and didn't declare: voluntary disclosure via HMRC Digital Disclosure Service before HMRC contacts you = lower penalty (10-30% vs 50-100% if discovered).
How is side hustle income taxed?
Added to your total income. Income tax bands apply: 0% to £12,570 (Personal Allowance — usually used by main job); 20% to £50,270; 40% to £125,140; 45% above. Plus Class 4 NI 6% on profits above £12,570. Sample £40,000 employment + £8,000 side hustle profit = £48,000 total, all within basic rate band: side hustle tax £1,600 + NI £480 = £2,080. Set aside 30-35% of side hustle income for tax. Allowable expenses reduce taxable profit — software, marketing, mileage, supplies, training.
Do I need to register for VAT?
Mandatory VAT registration: turnover £90,000+/year (2026 threshold, up from £85k April 2024). Most side hustles stay well below. Approaching threshold: register BEFORE crossing (look-back 12 months OR forward 30 days). Voluntary registration any level — useful if you sell B2B (clients reclaim VAT, you reclaim input VAT). Making Tax Digital for VAT: quarterly returns required, compatible software (Xero, Quickbooks, FreeAgent). Avoid Flat Rate Scheme unless calculations specifically favourable for your trade.