Side Hustle Tax Calculator UK
Work out the tax on your side income, when you must tell HMRC, and the trap most side hustlers miss — your extra earnings are taxed on top of your day job, at your highest rate.
Side hustle tax isn’t a separate tax — it’s the Income Tax and National Insurance you pay on earnings from freelancing, reselling, tutoring, or any small venture alongside a main job. The £1,000 trading allowance lets you earn up to £1,000 gross per tax year tax-free; cross it and you must register for Self Assessment and pay tax on the rest. The catch most people miss is that your side income stacks on top of your salary, so it’s taxed at your highest rate from the first taxable pound: a basic-rate worker keeps about 74p of every £1 of profit, a higher-rate one only around 54p — there’s no second tax-free allowance for the side hustle. Two more traps lie in wait: the £1,000 limit is measured on gross income before expenses, so you can owe tax even on a tiny profit; and you must register if you cross it even when no tax is actually due. This calculator shows what you’ll keep, when you must tell HMRC, and whether the £1,000 allowance or your actual expenses leaves you better off. For the full picture once you scale up, see the Self-Employed Tax Calculator; to check your main job, the Salary Take-Home Calculator.
Side hustle income
Main income and tax position
NI and registration checks
Payments and saving plan
Side hustle tax result
Estimated side hustle tax + NI
Calculating…
Calculating…
Taxable side profit
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Income Tax
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Class 4 NI
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Class 2 NI
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Take-home from side hustle
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Monthly set-aside
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Side hustle tax — quick lookup
The left table shows what you keep from your side hustle profit once you’re over the £1,000 allowance, depending on whether your main job makes you a basic-rate or higher-rate taxpayer. The right lists the thresholds and dates that decide what you must do. The headline is in the left table: your side income is taxed at your top rate from the first taxable pound, so the more you earn in your day job, the less of your side hustle you keep.
| Profit | Basic rate | Higher rate |
|---|---|---|
| £1,000 | £1,000 | £1,000 |
| £1,500 | £1,370 | £1,270 |
| £2,000 | £1,740 | £1,540 |
| £3,000 | £2,480 | £2,080 |
| £5,000 | £3,960 | £3,160 |
| Item | Figure |
|---|---|
| Trading allowance | £1,000 gross |
| Tell HMRC by | 5 Oct after tax year |
| File & pay by | 31 Jan online |
| Platform report trigger | 30 sales / £1,700 |
| Tax year | 6 Apr – 5 Apr |
“Basic rate” assumes your day job uses your personal allowance and keeps you under the higher-rate threshold, so side profit above £1,000 is taxed at 20% Income Tax plus 6% Class 4 National Insurance — you keep 74p in the pound. “Higher rate” assumes the side profit falls in the 40% band, plus Class 4 NI, so you keep roughly 54p. The £1,700 platform figure is the gross-sales level at which sites like Vinted must report you to HMRC; it is not a tax threshold.
How side hustle tax works
There’s no special “side hustle tax”. HMRC simply treats your side earnings as self-employed trading income, and it’s taxed the same way as any other income — Income Tax and National Insurance. What trips people up isn’t the rates; it’s how the income is measured and where it sits in your tax picture.
The £1,000 trading allowance
Everyone gets a £1,000 trading allowance each tax year. If your total gross trading income is £1,000 or less, you owe no tax on it and don’t need to register for Self Assessment. Go over £1,000 and two things happen: you must register with HMRC, and you pay tax on the income above the allowance — or, if your costs are higher, on your income minus your actual expenses instead.
The trap: it’s measured on gross, not profit
This is the part that catches people. The £1,000 limit is your gross income before any expenses — not your profit. So if you sell £1,500 of goods that cost you £600, your profit is only £900, but your gross income is £1,500. You’re over the threshold and must register, even though you made under £1,000. Worse, you can be required to register and report even when you owe no tax at all, simply because gross income passed £1,000. The obligation is to tell HMRC, separate from whether anything is due.
Why your day job decides your rate
Your side income doesn’t get its own tax bands — it stacks on top of your employment income. Your salary has usually already soaked up your £12,570 personal allowance, so the side hustle is taxed from its first taxable pound at whatever rate you’ve already reached. A basic-rate employee pays 20% Income Tax plus 6% Class 4 NI on side profit above the allowance, keeping 74p in the pound. A higher-rate employee pays 40% plus NI, keeping closer to 54p. The same £2,000 side profit is worth £1,740 to one person and £1,540 to another, purely because of the day job behind it.
Worked examples
Four scenarios showing how the allowance, gross-vs-profit, and your tax band change what you actually keep.
Scenario 1 · Casual seller, under the allowance
Nothing to declare
Trading allowance covers it: £0 tax
Register with HMRC? No
Someone clearing their wardrobe and earning £800 over the year stays under the £1,000 allowance. There’s no tax to pay and no need to register or report anything. Selling genuinely personal items at a loss usually isn’t trading at all — but even treating it as trading, the allowance keeps it tax-free. This is most casual sellers, despite the headlines about HMRC and online platforms.
Scenario 2 · Side hustle on a basic-rate salary
Keeping 74p in the pound
Taxable after allowance: £2,000 · tax 20% + 6% NI = £520
Keep: £2,480
A basic-rate employee earning £3,000 from freelancing pays tax on £2,000 (after the £1,000 allowance) at 20% Income Tax plus 6% Class 4 National Insurance — about £520 — and keeps £2,480. There’s no separate tax-free allowance for the side hustle; the £12,570 personal allowance is already used by the salary. Set aside roughly a quarter of every taxable pound and the January bill won’t sting.
Scenario 3 · Same hustle, higher-rate salary
The day job that costs you
Taxable after allowance: £2,000 · tax 40% + NI = £920
Keep: £2,080
Identical side work, but this person’s salary already puts them in the 40% band, so the side profit is taxed at 40% plus National Insurance from the first taxable pound. They keep £2,080 — £400 less than the basic-rate worker for exactly the same hustle. The lesson: what your side hustle is worth depends heavily on what you already earn. The higher your salary, the more a side hustle has to bring in to feel worthwhile.
Scenario 4 · High costs, allowance vs expenses
When to drop the allowance
Use allowance → taxable £3,000 · use expenses → taxable £2,200
Better choice: actual expenses, saving tax on £800
You can claim the £1,000 allowance or your actual expenses — never both — so you pick whichever leaves less taxable. With £1,800 of genuine costs, deducting expenses (taxable £2,200) beats the flat allowance (taxable £3,000). The rule of thumb: if your allowable expenses are more than £1,000, claim them instead. Below £1,000 of costs, the flat allowance wins and saves you the bookkeeping.
Do you actually owe anything? Four questions
Most guides just quote the £1,000 figure. The real answer to “do I pay tax on my side hustle?” depends on four things about your situation. Work through these before you panic about an HMRC letter — or before you assume you’re in the clear:
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1
Are you trading, or just selling your own stuff?
Selling personal items you once bought for yourself — old clothes, a used phone, furniture — usually isn’t trading and isn’t taxable, even above £1,000. But if you buy or make things specifically to sell at a profit, that’s trading. The frequency, intent, and pattern of your sales decide it.
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2
Is your gross income over £1,000?
The test is gross income before expenses, not profit. Add up everything you received across every platform and client. Over £1,000 gross and you must register and report — even if expenses wipe out the profit, and even if no tax ends up being due.
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3
What rate does your day job put you in?
Side income sits on top of your salary, so it’s taxed at your highest rate with no fresh allowance. Basic-rate employees keep about 74p per pound of taxable profit; higher-rate employees keep around 54p. Know your band before you judge whether the hustle is worth it.
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4
Are your expenses above £1,000?
Claim the flat £1,000 allowance or your real expenses — whichever leaves less taxable. If your stock, postage, fees, and supplies come to more than £1,000, claim actual expenses and keep the records. Below £1,000 of costs, take the allowance and skip the bookkeeping.
£3,000 side profit — same number, three people
Identical profit, very different take-home:
The same £3,000 leaves one person with the full amount and another with £2,080 — a £920 gap created entirely by whether it’s trading and what their salary is. That’s why “how much tax will I pay on my side hustle?” has no single answer. For genuine clear-outs of personal belongings, the honest answer is usually nothing. For real trading, the bill depends on your day-job tax band and your expenses, which is exactly what the calculator works out for your figures.
The HMRC nudge letter — and the platform data behind it
Since 2024, online platforms such as Vinted, eBay, Etsy, and Airbnb report seller data to HMRC each year. Vinted, for example, must report sellers who pass 30 sales or £1,700 in gross revenue in a year. This isn’t a new tax and that £1,700 isn’t a tax threshold — it’s just a reporting trigger. But it lets HMRC cross-check declared income against platform data, and where they spot a gap, they send a “nudge letter” inviting you to put it right. If you’ve genuinely traded over £1,000 gross and not declared it, the letter is a prompt to register and file before penalties build. If you were only selling your own possessions, you have nothing to declare — keep a note of what you sold and why, in case you’re asked.
Two scenarios that change the picture
What if…
Your gross is over £1,000 but profit is tiny?
What if…
A pay rise tips you into higher rate?
Key side hustle tax terms explained
Side hustle tax sits at the meeting point of self-employment rules, allowances, and the new platform reporting regime. The ten terms below cover what you’ll meet as your side income grows.
- Trading allowance
- A tax-free allowance of £1,000 of gross trading income per tax year. Earn up to it and you owe no tax and needn’t register; go over and you must register and pay tax on the rest — or on profit after expenses, whichever is lower.
- Gross income
- Your total receipts before deducting any expenses. This is the figure measured against the £1,000 allowance — not your profit — so you can cross the threshold even when your actual profit is small.
- Trading vs personal selling
- Whether you’re selling to make a profit (trading) or clearing out your own belongings. Selling personal possessions usually isn’t taxable; buying or making things to sell is. Frequency, intent, and pattern decide which side you’re on.
- Self Assessment
- The system for reporting and paying tax on untaxed income, including side hustles. Once over £1,000 gross you register, then file a return each year declaring the income and any expenses.
- Allowable expenses
- Costs you can deduct from income instead of the trading allowance — stock, postage, packaging, platform fees, materials. You claim the allowance or expenses, never both, so pick whichever leaves less taxable.
- Marginal rate
- The rate on your next pound of income. Because side income stacks on your salary, it’s taxed at your marginal rate from its first taxable pound — 20% for basic-rate, 40% for higher-rate — with no fresh allowance.
- Class 4 National Insurance
- National Insurance on self-employed profits, charged at 6% on profit between the lower and upper limits and 2% above. It’s added on top of Income Tax, which is why a basic-rate side hustler keeps 74p rather than 80p in the pound.
- Platform reporting (DAC7)
- Rules requiring online marketplaces to report seller data to HMRC each year. Vinted reports sellers passing 30 sales or £1,700 — a reporting trigger, not a tax threshold, that lets HMRC cross-check declared income.
- Nudge letter
- A letter from HMRC prompting you to check and declare income where platform data suggests a gap. It’s an invitation to put things right voluntarily before penalties; ignoring it can lead to assessments and fines.
- Property allowance
- A separate £1,000 tax-free allowance for property income, distinct from the trading allowance. Useful if your side hustle is renting out a driveway or storage; letting a furnished room may instead use Rent a Room relief.
Five mistakes side hustlers make with tax
The side hustle rules catch people out at exactly the moment their hustle starts working. These five errors, drawn from the recurring r/UKPersonalFinance and r/SmallBusinessUK threads, are the costly ones.
Measuring the £1,000 limit on profit, not gross
The trading allowance is tested on gross income before expenses, not profit. Sell £1,500 of goods that cost you £600 and you’re over the threshold and must register, even though you made only £900. Add up everything you received, across every platform, before judging whether you’ve crossed it.
Cost: missed registration, possible penalty Fix: test on total gross receiptsAssuming a second tax-free allowance
Many expect their side hustle to get its own £12,570 personal allowance. It doesn’t — your salary has already used it, so side profit is taxed from the first taxable pound at your top rate. Set aside roughly 26% (basic) or 46% (higher) of taxable profit so the January bill doesn’t surprise you.
Cost: a tax bill you didn’t budget for Fix: set aside tax at your marginal rateClaiming both the allowance and expenses
You can claim the £1,000 trading allowance or your actual expenses, never both. Claiming both is an error HMRC will pick up. Work out your tax both ways and use whichever leaves less taxable: the allowance if costs are under £1,000, actual expenses if they’re over.
Cost: rejected return, more tax owed Fix: choose one method, the cheaper oneThinking no tax due means nothing to do
Even if expenses or your allowances mean no tax is actually due, you must still register and file once gross income tops £1,000. The obligation to report is separate from owing tax. Skipping it because “I don’t owe anything” can still bring penalties for late or missing returns.
Cost: late-filing penalties despite £0 tax Fix: register and file once over £1,000 grossIgnoring the HMRC nudge letter
With platforms now reporting seller data, HMRC sends nudge letters where declared income doesn’t match. Ignoring one doesn’t make it go away — it can escalate to assessments and fines. If you’ve genuinely traded over £1,000 and not declared it, respond and put it right; if you only sold your own belongings, keep a note and reply.
Cost: assessments and interest charges Fix: respond and disclose voluntarilyFrequently asked questions
How much can I earn from a side hustle before paying tax?
You can earn up to £1,000 of gross trading income per tax year tax-free, thanks to the trading allowance. Below that, you owe no tax and don’t need to register with HMRC or file anything.
Once your gross income passes £1,000, you must register for Self Assessment and pay tax on the amount above the allowance — or on your profit after actual expenses, whichever is lower. The £1,000 is measured on total receipts before expenses, not profit, and across all your side activities combined.
Is the £1,000 limit based on profit or total sales?
Total sales — your gross income before any expenses. This is the part that catches people out: if you sell £1,500 of goods that cost you £600, your profit is only £900, but your gross income is £1,500, so you’re over the threshold and must register.
It means you can be required to report even when your actual profit is small, and even when, after expenses, no tax is due. Always test the £1,000 against your total receipts, not what you cleared.
Why is my side hustle taxed at such a high rate?
Because your side income sits on top of your salary, not in its own tax bands. Your £12,570 personal allowance is usually already used by your day job, so the side profit is taxed from its first taxable pound at whatever rate you’ve already reached.
A basic-rate employee pays 20% Income Tax plus 6% Class 4 National Insurance, keeping about 74p in the pound. A higher-rate employee pays 40% plus NI, keeping closer to 54p. There’s no second tax-free allowance for the hustle.
Do I have to tell HMRC if I sell on Vinted or eBay?
Only if you’re trading and your gross income tops £1,000. Selling your own personal belongings — old clothes, a used phone, furniture — usually isn’t trading and isn’t taxable, however much it adds up to. Buying or making things to sell at a profit is trading.
Platforms now report sellers passing 30 sales or £1,700 a year to HMRC, but that’s a reporting trigger, not a tax threshold. If you’re a genuine clear-out seller, you have nothing to declare; if you’re trading over £1,000 gross, you must register and report.
Should I claim the £1,000 allowance or my actual expenses?
Whichever leaves you with less taxable income — you can use one or the other, never both. The simple rule: if your allowable expenses (stock, postage, packaging, platform fees, materials) come to more than £1,000, claim actual expenses. If they’re under £1,000, take the flat allowance and save yourself the bookkeeping.
For example, on £4,000 gross with £1,800 of costs, claiming expenses leaves £2,200 taxable versus £3,000 with the allowance — so expenses win. Keep records either way in case HMRC asks.
Do I still need to file if I owe no tax?
Yes, if your gross trading income exceeded £1,000. The obligation to register and file is separate from whether any tax is actually due. Even if your expenses or unused allowances mean the bill is zero, you must still register for Self Assessment and submit a return once you’ve crossed the threshold.
Skipping it on the basis of “I don’t owe anything” can still trigger late-filing penalties. Register by 5 October after the tax year, and file and pay by the following 31 January.
What if HMRC sends me a nudge letter?
A nudge letter means HMRC’s data — often from an online platform — suggests you may have undeclared income. It’s an invitation to check and put things right voluntarily, before penalties build. Don’t ignore it: that can escalate to formal assessments, interest, and fines.
If you genuinely traded over £1,000 gross and didn’t declare it, register and disclose. If you were only selling personal possessions, you have nothing to declare — keep a note of what you sold and why, and respond to confirm. See official guidance at gov.uk.
Is the side hustle threshold going up to £3,000?
The government has announced an intention to raise the Self Assessment reporting threshold to £3,000, which would take an estimated 300,000 people out of filing a full return. Crucially, this changes the reporting threshold, not the trading allowance — income between £1,000 and £3,000 would still be taxable, just reported through a simpler online service.
The trading allowance itself stays at £1,000. Until the change takes effect, the £1,000 gross threshold for registering and filing applies, so don’t assume the higher figure is in force yet.
Related calculators
A side hustle connects to your main job, your wider self-employed position, and how you’re structured. These calculators handle each piece.
Methodology & sources
How the maths works
The calculator first checks your gross trading income against the £1,000 trading allowance. At or below it, no tax is due and no registration is needed. Above it, the taxable amount is the lower of your gross income minus the £1,000 allowance, or your gross income minus your actual allowable expenses — you may use one method but not both. Tax is then applied at your marginal rate, because side income stacks on top of your employment income: for a basic-rate taxpayer that is 20% Income Tax plus 6% Class 4 National Insurance, so you keep about 74p of each taxable pound; for a higher-rate taxpayer it is 40% plus National Insurance, leaving roughly 54p. The figures in the tables follow this method, which is why the same profit produces a different take-home depending on your day-job band.
These are illustrative estimates to show how side hustle income is taxed, not a personal tax computation. Your real position depends on your other income, your exact allowances, whether your activity counts as trading at all, your allowable expenses, your National Insurance position, and the current rates and thresholds, all of which can change. The aim is to show when you must tell HMRC, how much of your hustle you keep, and which allowance method serves you best — not to replace tailored accountancy advice.
Assumptions and conventions used
- Trading allowance: £1,000 of gross income per tax year
- Threshold test: gross income before expenses, all sources combined
- Allowance vs expenses: use whichever leaves less taxable, never both
- Basic-rate side profit: 20% Income Tax + 6% Class 4 NI (keep ~74%)
- Higher-rate side profit: 40% Income Tax + NI (keep ~54%)
- Personal allowance: assumed already used by your main salary
- Register by: 5 October after the tax year; file and pay by 31 January
- Rates and thresholds shown are illustrative current UK figures