FREE TOOL · 2024/25 RATES
Calculate your Income Tax, National Insurance and take-home pay for 2024/25 — based on your actual income, expenses and pension contributions.
Van costs, tools, insurance, materials, accountancy, phone, workwear, etc.
Personal pension contributions reduce your taxable profit — annual limit is £40,000 or 100% of earnings.
Registered for VAT?
Affects your VAT threshold warning only
Based on £35,000 income − £5,000 expenses − £0 pension = £30,000 taxable profit
Monthly tax to set aside
£393
£4,711 total tax bill ÷ 12 months
Monthly take-home
£2,107
after tax & NI
Annual take-home
£25,289
after tax & NI
Effective tax rate
15.7%
of your taxable profit
£3.45/week × 52 weeks
6% on profits £12,571–£50,270
Step 1 — Taxable profit: Income minus allowable expenses minus pension contributions. This is the figure HMRC taxes.
Step 2 — Personal Allowance: The first £12,570 of profit is tax-free. Above £100,000 the allowance tapers — you lose £1 for every £2 of profit above £100,000, reaching zero at £125,140.
Step 3 — Income Tax bands: 20% on £12,571–£50,270 (basic rate), 40% on £50,271–£125,140 (higher rate), 45% above £125,140 (additional rate).
Step 4 — Class 2 NI: A flat £3.45/week (£179.40/year) if profits exceed £12,570.
Step 5 — Class 4 NI: 6% on profits £12,571–£50,270, then 2% on profits above £50,270.
Step 6 — Take-home: Income minus expenses minus total tax bill. Note: pension contributions reduce your tax but are not “taken home” — they go into your pension pot.
This calculator uses 2024/25 rates. It provides an estimate only and does not constitute tax advice. Consult a qualified accountant for your personal tax situation.
HMRC taxes sole traders on their net profit — not their gross turnover. Understanding each layer helps you plan ahead and avoid a nasty Self Assessment surprise every January.
Every pound you spend wholly and exclusively for business reduces your taxable profit by a pound. A van that costs £5,000/year in running costs saves a basic-rate tradesman £1,000 in tax and £300 in NI. Keep every receipt.
The first £12,570 of profit is completely tax-free. Once you cross that threshold you start paying Income Tax at 20%, then 40% above £50,270. Planning your income across tax years can help keep you in the lower band.
Many tradesmen forget Class 4 NI when budgeting. At £50,000 profit you owe around £2,292 in Class 4 NI on top of your income tax. It's paid via Self Assessment alongside your tax bill in January — set it aside monthly.
In your second year of trading HMRC usually requires “payments on account” — 50% of your estimated bill in January, then another 50% in July. Your first January bill can be 150% of your normal annual bill. The monthly set-aside figure above smooths this out.
Marcus is a sole trader plumber in the Midlands earning £48,000/year. He has £8,000 of allowable expenses (van, tools, insurance, accountancy) and pays £2,000/year into a personal pension:
Income
£48,000
Expenses + Pension
£10,000
Taxable Profit
£38,000
Effective Rate
~19%
Marcus sets aside each month
£599/month
£4,686 Income Tax + £179 Class 2 + £3,327 Class 4 = £8,192/yr
Names are illustrative. Use the calculator above for your own income, expenses and pension figures.
Everything UK sole trader tradesmen ask about tax.
HMRC allows sole traders to deduct expenses that are wholly and exclusively for business purposes. For tradesmen this includes: tools and equipment, van running costs (fuel, insurance, servicing, MOT), work clothing and PPE, public liability and professional indemnity insurance, accountancy and bookkeeping fees, phone and broadband used for work, materials and subcontractor costs, training and professional subscriptions, and a portion of your home office costs if you work from home. Keep all receipts — HMRC can ask for evidence up to 7 years later.
Yes — you pay two classes of National Insurance as a sole trader. Class 2 NI is a flat rate of £3.45 per week (£179.40 per year for 2024/25) if your profits exceed £12,570. Class 4 NI is percentage-based: 6% on profits between £12,571 and £50,270, and 2% on profits above £50,270. Both are calculated on your net profit after expenses, not your gross income. They're usually paid via your Self Assessment return in January.
The VAT registration threshold for 2024/25 is £90,000 in taxable turnover over any rolling 12-month period. Once you exceed this you must register for VAT within 30 days and start charging VAT on your services. Being VAT registered has advantages (you can reclaim VAT on materials and tools) and disadvantages (more admin and your quotes look 20% more expensive to non-VAT-registered customers). If you're close to the threshold, consider the VAT Flat Rate Scheme which simplifies accounting.
It depends on your profit level, but 20-30% is a sensible rule of thumb for most tradesmen. At £35,000 profit your effective tax rate (Income Tax + NI) is around 15-18%, so 20% is a comfortable buffer. At £55,000 profit you're into the 40% higher-rate band on some of your income, so 25-30% is more appropriate. The calculator above gives you a precise monthly set-aside figure based on your actual numbers — use that rather than a rough percentage to avoid nasty surprises in January when your Self Assessment payment is due.
Find your ideal hourly rate based on trade, experience, region and overheads.
See your true margin on every job after labour, materials and overheads.
Calculate total labour cost per job including NI contributions and travel.
Estimate your CIS deduction refund from HMRC for the current tax year.
Track business mileage and calculate your HMRC-approved mileage allowance.
Download 10 free blank PDF invoice templates for UK sole trader tradesmen.
KEEP MORE OF WHAT YOU EARN
You've got your tax estimate. Now save the admin hours that eat into your earnings. Sleepless Tradesman quotes, invoices and tracks every job in minutes — for free, no card required.
No card · No commitment · Cancel anytime