Tax Deductions for the Self-Employed in the UK 2026: Complete Guide
Most self-employed people in the UK miss at least 3 allowable expenses they're entitled to claim. Home office, vehicle, phone, software — the rules are specific and HMRC scrutinises them. Here's what you can and can't deduct.
What makes an expense tax-deductible?
An allowable expense is one you can deduct from your income before calculating the tax you owe. If you earn £50,000 and have £15,000 in allowable expenses, you pay tax on £35,000 — not on £50,000.
HMRC's rule is that the expense must be wholly and exclusively for business purposes. This is stricter than it sounds — if an expense has any personal element, it may not be deductible in full.
The most common allowable expenses for the self-employed
Office costs
If you work from a dedicated office or business premises, all costs are 100% deductible: rent, utilities, internet, business rates.
If you work from home, you can either:
Most people find the flat rate easier, but if you have a dedicated room used only for work, the actual cost method can be higher.
Vehicle and mileage
For cars, you have two options:
You cannot switch methods mid-ownership of the vehicle. The mileage rate is simpler and often better for lower-mileage drivers.
Vans used exclusively for business are 100% deductible on actual costs.
Phone and broadband
A dedicated business phone is 100% deductible. If you use one phone for both personal and business, only the business proportion is allowable — keep records to justify the split.
Broadband costs work the same way: if it's a home connection used partly for business, apportion it.
Equipment and tools
Computers, tools, machinery and professional equipment used for business are deductible. Items over a certain value are depreciated through the Annual Investment Allowance (AIA), which in 2026 allows 100% first-year deduction on most plant and machinery up to £1 million.
Software and subscriptions
All software and digital subscriptions used for business are allowable: accounting software, project management tools, cloud storage, professional databases. Keep the invoices.
Training and development
Courses, books, conferences and professional training that maintain or update skills in your existing trade are deductible. Training for a new trade or career is not.
Professional membership fees (e.g. ICAEW, CIMA, Law Society) are deductible if membership is relevant to your business.
Professional insurance
Public liability insurance, professional indemnity insurance and other business-related insurance premiums are 100% deductible.
Accountant and professional fees
Fees paid to your accountant, bookkeeper, solicitor or other professional advisers for business matters are fully deductible.
National Insurance contributions
Class 2 and Class 4 NI contributions are not deductible against income tax — they are paid on your profits, not before them. However, they reduce your net income available.
What you cannot deduct
VAT Flat Rate Scheme: a note on expenses
If you're on the FRS, you cannot reclaim input VAT on most purchases. Your FRS percentage is calculated to account for this. Make sure you're not double-counting by deducting expenses inclusive of VAT while also using FRS — your deductible expenses should be net of VAT for the FRS calculation.
How Syntra helps you track deductible expenses
Syntra automatically categorises each expense when you process an invoice:
With every expense categorised in real time, you always know your actual taxable profit — not just at year end when it's too late to plan.
💡 Syntra categorises your expenses automatically and flags which are tax-deductible.
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