Tax confuses a lot of tradespeople — not because it's complicated, but because nobody teaches it when you start out. PAYE employees have tax deducted automatically. When you're self-employed, it's your problem: you need to know what you owe, when to pay it, and how to set aside the right amount throughout the year.
Get it wrong and you face unexpected bills, interest charges, and penalties. Get it right and you pay only what you legally owe — no more, no less.
This guide covers everything a self-employed UK tradesperson needs to know about tax for 2025/26.
This guide is for information only. Tax rules can change and everyone's situation is different. Always work with a qualified accountant to ensure your self-assessment is correct.
What Taxes Do Self-Employed Tradespeople Pay?
As a self-employed sole trader in the UK, you pay two types of tax on your trading profits:
- Income Tax — on profits above the personal allowance
- Class 4 National Insurance — on profits above the lower profits limit
Note: Class 2 NI was abolished from April 2024 (2024/25 tax year onwards). You no longer pay the flat-rate Class 2 weekly NI charge.
2025/26 Tax Rates and Thresholds
Income Tax
| Band | Taxable Profit | Rate |
|---|---|---|
| Personal Allowance | Up to £12,570 | 0% |
| Basic Rate | £12,571 – £50,270 | 20% |
| Higher Rate | £50,271 – £125,140 | 40% |
| Additional Rate | Over £125,140 | 45% |
Personal Allowance tapering. If your income exceeds £100,000, your personal allowance reduces by £1 for every £2 over the threshold. At £125,140 or above, the personal allowance is zero — and you face an effective 60% marginal rate between £100,000 and £125,140.
Class 4 National Insurance
| Band | Profit Range | Rate |
|---|---|---|
| Below lower profits limit | Up to £12,570 | 0% |
| Main rate | £12,571 – £50,270 | 6% |
| Above upper profits limit | Over £50,270 | 2% |
What You Actually Pay — Real Numbers
Here's the complete picture for a self-employed tradesperson at different income levels for 2025/26:
| Gross Profit | Income Tax | Class 4 NI | Total Tax | Take-Home | Effective Rate |
|---|---|---|---|---|---|
| £20,000 | £1,486 | £444 | £1,930 | £18,070 | 9.7% |
| £30,000 | £3,486 | £1,044 | £4,530 | £25,470 | 15.1% |
| £40,000 | £5,486 | £1,644 | £7,130 | £32,870 | 17.8% |
| £50,000 | £7,486 | £2,244 | £9,730 | £40,270 | 19.5% |
| £60,000 | £11,432 | £2,444 | £13,876 | £46,124 | 23.1% |
| £70,000 | £15,432 | £2,644 | £18,076 | £51,924 | 25.8% |
These figures are based on gross profit (income minus allowable expenses), not turnover. Reducing your taxable profit through legitimate expense claims reduces both income tax and NI. Use our Take-Home Pay Calculator for any specific income level.
Worked Example: Electrician, £48,000 gross profit
Self-Assessment — How It Works
As a self-employed tradesperson, you're responsible for reporting your income to HMRC through self-assessment. Here's the annual cycle:
End of the tax year. Your profit for the year ending on this date is what you'll report.
Deadline to register for self-assessment if you're new to self-employment (for the previous tax year).
Deadline for paper self-assessment returns.
Deadline for online self-assessment returns AND payment of the tax bill for the previous year — plus the first payment on account for the current year.
Deadline for second payment on account (50% of previous year's bill).
Penalties for Late Filing and Payment
- Late return (after 31 Jan): Immediate £100 penalty. After 3 months: £10/day up to £900. After 6 months: 5% of tax owed or £300 (whichever is higher).
- Late payment: Interest on overdue amounts (Bank of England base rate + 2.5%) plus surcharges of 5% at 30 days and 6 months.
File on time even if you can't pay. If you can't afford the tax bill, file on time anyway to avoid the filing penalty. Then call HMRC — they will usually agree a Time to Pay arrangement for genuinely struggling taxpayers. Penalties for late filing are separate from and additional to late payment interest.
Payments on Account — The First Year Shock
When your self-assessment bill exceeds £1,000, HMRC requires you to make advance payments for the following year. These are called "payments on account."
Here's how they work: if your 2024/25 tax bill was £8,000:
- 31 January 2026: Pay £8,000 (2024/25 bill) + £4,000 (first payment on account for 2025/26) = £12,000 in one month
- 31 July 2026: Pay £4,000 (second payment on account)
- 31 January 2027: Pay the balancing payment for 2025/26 (actual bill minus the £8,000 already paid), plus first payment on account for 2026/27
The first-year trap. Many tradespeople get through their first year without knowing about payments on account. Then in January, they face the first year's full bill PLUS 50% again as a payment on account. This catches people by surprise. Set aside around 25–30% of every payment you receive throughout the year into a separate account, and you'll never be caught short.
Allowable Expenses — What You Can Claim
Your taxable profit is income minus allowable expenses. HMRC's rule: expenses must be "wholly and exclusively" for business purposes. Key allowable expenses for tradespeople:
Vehicle costs
You can claim either actual vehicle costs (fuel, insurance, repairs, finance interest, road tax) or the HMRC simplified mileage rate (45p/mile for the first 10,000 miles, 25p after). You must pick one method per vehicle and stick with it. The mileage rate is simpler; actual costs may be higher for expensive-to-run vehicles.
Tools and equipment
Tools, machinery, and equipment used for your trade are deductible under the Annual Investment Allowance (AIA) — full deduction in the year of purchase up to the AIA limit (£1 million for 2025/26). This applies to large purchases like van-mounted tools, compressors, and specialist equipment.
Home office
If you use part of your home for business (admin, storing equipment), you can claim a proportion of home running costs. HMRC's simplified flat rate: £10/month for 25–50 hours work at home per month; £18/month for 51–100 hours; £26/month for 101+ hours.
Subsistence
Meals and refreshments while working away from your normal place of work can be claimed, but HMRC scrutinises these carefully. Keep receipts and be conservative — the journey must have business purpose, and you must be working away from your normal area.
What you can't claim
- Personal clothing (even if you buy it new for work — unless it's protective or branded workwear)
- Client entertainment
- Fines, including parking tickets
- Your own wages or drawings (these come from profit, not before it)
- Personal pension contributions (these are handled separately, not as a business expense)
Keep every receipt. HMRC can investigate your tax return up to 4 years after filing (or longer if they suspect fraud). A simple folder — physical or digital — with every business receipt is your first line of defence. Free apps like Dext or AutoEntry can photograph receipts and store them automatically.
VAT Registration
VAT is separate from income tax. You must register for VAT if your VAT-taxable turnover (not profit — turnover) exceeds £90,000 in any rolling 12-month period (2025/26 threshold).
Once registered:
- You charge 20% VAT on all your services (standard-rated trades)
- You file quarterly VAT returns with HMRC
- You pay over the difference between VAT you've charged and VAT you've paid on purchases
- You can reclaim VAT paid on business purchases
Should you register voluntarily?
Voluntary registration below the threshold can be worthwhile if most of your customers are VAT-registered businesses (who can reclaim VAT). It allows you to reclaim VAT on your own purchases — van, tools, materials — which can be significant. Not recommended if most of your work is for domestic customers, who cannot reclaim VAT and will see your price increase.
The Flat Rate Scheme
The Flat Rate Scheme (FRS) simplifies VAT for smaller businesses. Instead of accounting for VAT on every purchase, you pay a fixed percentage of your gross turnover (including VAT you've charged) to HMRC. For general building or construction services, the rate is typically 9.5%. You cannot reclaim input VAT under the FRS (except for certain capital goods over £2,000). Whether it's beneficial depends on your mix of VAT-able purchases — worth discussing with your accountant.
Pension and Tax Efficiency
Pension contributions are one of the most tax-efficient moves available to self-employed tradespeople:
- Contributions receive basic rate tax relief automatically — a £800 contribution becomes £1,000 in your pension
- If you're a higher-rate taxpayer, you can claim additional relief through self-assessment
- Pension contributions do not reduce your self-assessment profit, but they do effectively use income that would otherwise be taxed
The annual allowance (maximum you can contribute with tax relief) is £60,000 for 2025/26, or 100% of your earnings if lower. For most tradespeople, a SIPP (Self-Invested Personal Pension) is the most flexible option.
CIS — Construction Industry Scheme
If you work as a subcontractor on construction projects, you may be subject to the Construction Industry Scheme (CIS). Under CIS:
- The main contractor deducts 20% (registered subcontractors) or 30% (unregistered) from your payments before passing them on
- These deductions are advance payments towards your income tax and NI
- You claim them back through self-assessment if they exceed your actual tax bill
- You must register as a subcontractor with HMRC — don't just rely on the contractor registering you
CIS deductions are not a final tax payment. They're an advance. If your actual tax bill is lower than the CIS deductions taken, you'll get a refund. If it's higher (because you have other income), you'll owe the difference. Keep separate records of CIS deductions received and reconcile them in your self-assessment.
See Your Exact Take-Home Pay
Enter your gross income and the calculator shows your income tax, National Insurance, and take-home pay based on 2025/26 HMRC rates.
Open Take-Home Pay Calculator →Making Tax Digital
HMRC is rolling out Making Tax Digital for Income Tax Self-Assessment (MTD for ITSA). From April 2026, self-employed people with income over £50,000 will be required to use compatible software and submit quarterly updates to HMRC instead of a single annual return. Those with income over £30,000 will follow in April 2027.
If your turnover is above these thresholds, start using compliant accounting software (QuickBooks, FreeAgent, Xero) now rather than leaving it to the last minute.
Frequently Asked Questions
How much tax does a self-employed tradesperson pay in the UK?
For 2025/26: the personal allowance is £12,570 (tax-free), then 20% income tax up to £50,270, then 40% above. Class 4 NI is 6% between £12,570 and £50,270, then 2% above. At £40,000 gross profit, total tax and NI is approximately £7,130, leaving take-home of £32,870. Use our Take-Home Pay Calculator for your specific situation.
What is payments on account?
Advance payments of tax for the following year, required when your self-assessment bill exceeds £1,000. You pay 50% in January and 50% in July. In your first year, you pay the full bill in January plus 50% again as the first payment on account — this can be a large combined payment. Set aside 25–30% of every payment you receive throughout the year.
What expenses can I claim against tax?
Van costs (actual or HMRC mileage rate), tools and equipment (full deduction under AIA), insurance, professional memberships, accountant fees, phone and broadband (business proportion), workwear and PPE, and trade-related training. Expenses must be wholly and exclusively for business. Always keep receipts.
Do I need to register for VAT?
You must register once your VAT-taxable turnover exceeds £90,000 in any rolling 12-month period. Voluntary registration can be beneficial if you mainly work for VAT-registered businesses, as you can reclaim VAT on your purchases. Not recommended for mainly domestic work.