The £1,000 Trading Allowance Explained — Tax-Free Side Income for UK Tradespeople (2026)

What the Trading Allowance Actually Is

The trading allowance is a flat £1,000 tax-free allowance for trading and casual self-employment income, available to each individual once per tax year. The key word is gross: it applies to your total trading income — your turnover, the money that comes in before you take any expenses off — not your profit.

If your total trading income for the tax year is £1,000 or less, that income is completely tax-free. You generally don't need to tell HMRC about it, you don't need to register for Self Assessment, and you don't need to file a tax return for it. HMRC calls this full relief — the allowance covers everything and you have nothing to report.

So if you earned £600 over the year doing the odd bit of weekend labouring on the side, and that's your only self-employed income, you're done. No registration, no return, no tax. That's the whole point of the allowance — it keeps trivial amounts out of the system.

What Happens Once You Go Over £1,000

The moment your gross trading income for the year goes above £1,000, the picture changes. You must register for Self Assessment and report that income to HMRC — there's no longer an option to ignore it. This is true even if, after expenses, you barely make a profit or owe little to no tax. The £1,000 threshold is about whether you have to declare, not about whether you end up paying.

But the allowance doesn't disappear once you cross the line. If you're over £1,000 you can still choose to deduct the £1,000 allowance instead of your actual expenses. HMRC calls this partial relief: you pay tax on your income minus £1,000, rather than income minus your real costs. For example, if you turned over £2,500 and used partial relief, your taxable profit would be £1,500.

The crucial rule: you cannot claim both. It's the £1,000 allowance or your actual expenses — never both together. So the decision becomes simple arithmetic: work out your taxable profit each way, and use whichever gives you the lower figure.

Allowance vs Expenses — Which to Choose

Here's the rule of thumb that covers almost every case:

• If your real allowable expenses for the year are less than £1,000, claim the trading allowance — it gives you a bigger deduction than your actual costs would.
• If your real allowable expenses are more than £1,000, claim your actual expenses and don't use the allowance — your costs are worth more to you than the flat £1,000.

For a genuine side-earner with low costs, the allowance usually wins. For most established trades it's the opposite — a van, fuel, tools, insurance and materials will blow past £1,000 in expenses very quickly, so you claim the real figures. Two worked examples make this clear.

Example 1: Low-expense side job — use the allowance

Liam does occasional weekend handyman jobs alongside his employed work. Over the year he takes in £3,000. His only real costs are a bit of consumables and fuel, totalling about £400.

• Claiming actual expenses: £3,000 − £400 = £2,600 taxable profit
• Claiming the trading allowance: £3,000 − £1,000 = £2,000 taxable profit

The allowance wins by £600 of profit. Liam still has to register and declare because he's over £1,000 gross — but he chooses partial relief and pays tax on £2,000.

Example 2: Established trade — claim real expenses

Sarah is a self-employed plumber. She turns over £42,000 in the year. Her allowable expenses — van running costs, fuel, tools, materials, public liability insurance, phone — come to £11,000.

• Claiming actual expenses: £42,000 − £11,000 = £31,000 taxable profit
• Claiming the trading allowance: £42,000 − £1,000 = £41,000 taxable profit

Her real expenses are worth eleven times the allowance, so she claims actual costs and ignores the trading allowance entirely. For any working trade with normal overheads, this is the everyday reality — the allowance simply isn't relevant once you're properly up and running.

Important Traps and Limits

The trading allowance is simple in principle but has a few sharp edges that catch people out:

• It's gross income, not profit. The £1,000 test is on turnover before any costs. Earn £1,200 and spend £900 on materials, and you're still over the threshold and must register — even though your actual profit was only £300.
• It does not apply to partnership income. If your trading income comes from being a partner in a partnership, you can't use the trading allowance against it.
• It does not apply to income from your own limited company. Money you take from a company you control — or wages from an employer — is not trading income and the allowance can't be used against it. The allowance is for sole trader / casual self-employment income only.
• It's separate from the £1,000 property allowance. There's a different £1,000 allowance for small amounts of property income (e.g. renting out a room or driveway). They're two distinct reliefs — you can potentially use both, but the trading allowance only covers trading income.
• It becomes irrelevant as you grow. Once you're a real trade with expenses comfortably over £1,000, the allowance does nothing for you. Don't cling to it — claim your actual costs.

The single most important point to take away: once your gross trading income passes £1,000 you must register and declare it, even if you'll end up owing little or no tax. The duty to report is triggered by the income level, not by whether tax is due.

Registering for Self Assessment and Keeping Records

If you go over £1,000 and need to register, the deadline matters. You must register for Self Assessment by 5 October following the end of the tax year in which you started trading. So if you started picking up paid side jobs during the 2025–26 tax year (which runs 6 April 2025 to 5 April 2026), you need to register by 5 October 2026. You register online through GOV.UK; HMRC then issues a Unique Taxpayer Reference (UTR) and you file your return after the tax year ends, with the online filing and payment deadline of 31 January.

Keep records from day one, even on small amounts. You don't need accounting software to start — a simple log of what came in (date, customer, amount) and what you spent (date, supplier, amount, receipt) is enough, and it's exactly what you'll need to decide between the allowance and actual expenses. Without records you can't prove your expenses, and you can't show HMRC that your income was under the threshold if they ask.

And to be completely clear: cash jobs count. The old yard belief that "cash doesn't need declaring" is wrong and it's dangerous. Income is income whether it's paid in cash, by bank transfer or by card. Not declaring taxable income is tax evasion, which is a criminal offence — HMRC has data-matching tools, and the penalties, interest and reputational damage are not worth it. The right approach is the boring one: keep records, declare what you earn, claim what you're entitled to, and sleep well. The trading allowance exists precisely so that small, casual income can be handled cleanly and legally.

Who the Trading Allowance Is Actually Useful For

The allowance is genuinely valuable for a specific group of people:

• Genuine side-earners doing a handful of jobs around an employed role, with low costs.
• People just starting out who are testing whether a trade can become a full-time thing, before they've built up real overheads.
• Occasional, casual workers — the odd cash-in-hand favour that nonetheless counts as taxable income.

But it stops being relevant the moment your trade grows up. Once you have a van, tools, insurance and material costs, you'll claim actual expenses every time. As you scale further you might think about going limited, and once your turnover approaches the VAT registration threshold (£90,000 for 2025–26) you'll have VAT to deal with too. The trading allowance is a starter relief — a clean way to handle your first bit of side income — not a long-term tax strategy.

Quick Reference: Trading Income Scenarios

Frequently Asked Questions

Do I have to declare a £500 cash job?

If that £500 is your only trading income for the tax year, it falls under the £1,000 trading allowance and is tax-free — you don't need to register or declare it. But if you have other side income that pushes your total gross trading income over £1,000 for the year, then yes, the whole lot must be declared, including that £500. Remember the test is on your total trading income for the year, not on each individual job, and cash counts the same as any other payment.

Can I claim the trading allowance and my expenses?

No. It's strictly one or the other. You either deduct the flat £1,000 trading allowance from your income, or you deduct your actual allowable expenses — you can't do both. Work it out each way and pick whichever leaves you with the lower taxable profit. If your real expenses are under £1,000, the allowance is better; if they're over £1,000, claim the real costs.

When do I need to register for Self Assessment?

Once your gross trading income for a tax year goes over £1,000, you need to register. The deadline is 5 October following the end of that tax year — so for income earned in the 2025–26 tax year, you must register by 5 October 2026. You then file your return and pay any tax due by the following 31 January. Don't leave it to the last minute: registering generates your UTR, which can take a little while to arrive.