Self-Employment Tax in the UK: What You'll Actually Owe

When you're running your own furniture business, selling bespoke pieces online, or offering interior consultancy, the tax picture looks completely different from being employed. Nobody's taking tax from your wages before you see them. Instead, you're responsible for working out what you owe and paying it yourself. This catches a lot of people off guard.

The amount you'll pay depends on three main things: how much profit you make, whether you're registered for VAT, and whether you're paying National Insurance contributions. Let's work through each one.

Income Tax: The Straightforward Bit

Income tax is calculated on your profit, not your turnover. If you're selling furniture online and you make £50,000 in sales but spent £20,000 on stock, transport, and packaging, your profit is £30,000. You pay tax on that £30,000.

For the 2024/25 tax year, the personal allowance is £12,570. That's the amount you can earn without paying any income tax. So if your profit is £30,000, you only pay tax on £17,430.

The tax rates themselves are straightforward. You pay 20% on profits between £12,571 and £50,270. That means on our £17,430 taxable profit, you'd owe £3,486 in income tax.

If your business is genuinely making over £50,270 profit, the next slice is taxed at 40%. Most furniture businesses operating through a sole trader structure won't hit this rate, but it's worth knowing if you're planning expansion.

National Insurance: The Bit People Forget

This is where many self-employed people get a shock. You're liable for National Insurance contributions even if your profit is relatively low. Unlike employees, where your employer covers half the cost, you're paying the whole lot yourself.

There are two types of National Insurance payments for self-employed people. Class 2 contributions are a flat rate of £163.80 per year if your profit is over £6,725. That's the minimum, regardless of how much you earn. If you're just starting out in furniture dealing and making less than £6,725, you don't pay it, but you might want to anyway to keep your contribution record intact.

Class 4 contributions are calculated as a percentage of your profit. You pay 9% on profits between £11,908 and £50,270, and 2% on anything above that. Using our £30,000 profit example, that's 9% on £18,092 (the amount above £11,908), which comes to £1,628.

Combined, National Insurance is now £1,792 per year on that £30,000 profit.

VAT: It Depends on Your Turnover

You must register for VAT if your turnover exceeds £90,000 in any 12-month period. Some businesses choose to register below this threshold, but there's no getting around it once you hit £90,000.

For furniture retailers, this matters because VAT is charged at 20% on most goods and services. When you're registered, you collect VAT from your customers but then reclaim the VAT you've paid on business purchases. The net difference goes to HMRC.

If you're selling £95,000 of furniture annually at 20% VAT, you're collecting £19,000 in VAT from customers. But if you've spent £40,000 on stock from suppliers (including their VAT), you get most of that back. It's not quite as simple as paying 20% of your turnover to HMRC.

The key point: VAT doesn't affect your income tax calculation. It sits separately. Your profit figure for income tax purposes is before VAT.

What You Can Deduct

Reducing your profit means reducing your tax bill. You can deduct legitimate business expenses.

• Stock and materials for your furniture business
• Vehicle costs including fuel, insurance, and maintenance if used for business
• Rent for a workshop or office space
• Equipment and tools
• Professional fees like accountancy
• Website hosting and software subscriptions
• Insurance for your business
• Stationery and office supplies

You can't deduct personal expenses. If you're using a room in your home as an office, you can claim a proportion of rent or mortgage interest, council tax, and utilities. HMRC accepts £26 per week as a flat rate for home office use, or you can calculate actual costs if they're higher.

Putting It Together: A Real Example

Say you're selling reclaimed furniture online. Your annual turnover is £45,000. You bought stock for £18,000, paid £3,200 for a van used entirely for deliveries, spent £1,500 on a website and software, and £800 on insurance.

Your profit is £45,000 minus £23,500 (total expenses), which equals £21,500.

Income tax: £21,500 minus the £12,570 allowance leaves £8,930 taxable. At 20%, that's £1,786.

Class 2 National Insurance: £163.80.

Class 4 National Insurance: 9% on £9,592 (the amount above £11,908) equals £863.

Total tax bill: £2,813 per year, or about £235 per month.

Getting Organised

The best approach is setting aside money monthly rather than getting a shock when your tax bill lands. If you owe £2,813, setting aside £234 each month means you're never caught short.

Register for Self Assessment immediately if you're self-employed. The deadline for submitting your tax return and paying is 31 January following the tax year. Miss this and you'll face penalties.

Consider using accounting software or hiring an accountant. The £300 to £800 you spend on accountancy fees is deductible, and it often saves you more than that through identifying deductions you'd otherwise miss.

Self-employment tax isn't mysterious. It's just different from being employed. Once you understand the three elements (income tax, National Insurance, and potentially VAT), you can plan properly and keep more of what you earn.