Allowable Expenses for Self Employed in the UK | Reduce Your Tax Bill

If you’re self-employed in the UK, one of the most powerful ways to reduce your tax bill is to claim allowable expenses for self employed work. These are legitimate business costs that HMRC lets you deduct from your income before calculating how much tax you owe.

Put simply: the more allowable expenses you claim, the lower your taxable profit — and the less tax you pay.

For example, if you earn £40,000 as a sole trader and have £10,000 in allowable expenses, you only pay tax on £30,000. At the basic tax rate of 20%, that’s a saving of £2,000.

Yet thousands of self-employed workers in the UK leave money on the table every year by failing to claim everything they’re entitled to. This guide covers every major category of allowable expenses, common mistakes to avoid, and how to make sure your next Self Assessment tax return is fully optimised.

Key Takeaways

• Allowable expenses are legitimate business costs you can deduct from your income to reduce your taxable profit.
• HMRC allows most “wholly and exclusively” business costs as deductions.
• You do not need receipts under £2,500 per item, but keeping records is strongly recommended.
• Self-employed individuals can claim expenses across 10+ categories including office, travel, marketing, and equipment.
• Claiming all your allowable expenses is legal, encouraged, and essential to avoid overpaying tax.

Who Can Claim Allowable Expenses for Self Employed Work?

You can claim allowable expenses if you are:

• A sole trader filing a Self Assessment tax return
• A freelancer or contractor working for multiple clients
• A partner in a business partnership
• A landlord (for property-specific expenses)
• A CIS subcontractor in construction

Limited company directors claim expenses differently through the company, not through Self Assessment. If you’re unsure about your status, speak to a qualified tax adviser.

The Golden Rule: “Wholly and Exclusively”

HMRC has one overarching rule for allowable expenses for self employed individuals: the cost must be “wholly and exclusively” for the purpose of your business.

This means:

• Personal costs are not deductible.
• Mixed-use costs (part personal, part business) may be partially deductible — you must apportion them correctly.
• Costs must relate to your current trade, not a future or past one.

Complete List of Allowable Expenses for Self Employed in the UK

1. Office Costs

If you work from a dedicated office or from home, you can claim a proportion of your costs.

Claimable office expenses include:

• Rent for a business premises
• Business rates
• Utility bills (electricity, gas, water) — business proportion only
• Office furniture and equipment
• Stationery, postage, and printing
• Computer software and subscriptions

Working from home: You can use HMRC’s flat rate allowance (£6/week or £312/year) or calculate the actual business proportion of your home costs. The flat rate is simpler; the actual cost method can yield a higher deduction but requires more record-keeping.

2. Travel and Transport Expenses

Travel costs are among the most commonly claimed — and most commonly under-claimed — allowable expenses for self employed workers.

You can claim:

• Mileage for business journeys using your personal car (45p per mile for the first 10,000 miles; 25p thereafter)
• Public transport fares (train, bus, taxi) for business travel
• Parking fees and road tolls on business journeys
• Flights and accommodation for business trips
• Congestion charges

You cannot claim:

• Commuting between your home and a permanent place of work
• Personal travel or holidays disguised as business trips

Pro tip: Use a mileage log app to track every business journey. HMRC may ask for evidence if you’re audited.

3. Staff and Subcontractor Costs

If you hire employees or subcontractors, their costs are allowable business expenses.

Claimable costs include:

• Wages, salaries, and bonuses
• Employer’s National Insurance contributions
• Pension contributions made on behalf of staff
• Payments to subcontractors (CIS or otherwise)
• Agency fees for temporary staff
• Staff training directly related to the business

4. Stock, Materials, and Goods

If your business sells products or uses raw materials, these are fully deductible.

Examples:

• Raw materials used in manufacturing
• Goods purchased for resale
• Packaging materials
• Direct production costs

5. Marketing and Advertising

Growing your business is a cost HMRC recognises fully.

Allowable marketing expenses include:

• Website design, development, and hosting
• Social media advertising (Meta Ads, Google Ads, etc.)
• Printed materials: leaflets, business cards, brochures
• PR and media campaigns
• Sponsorships (where the primary purpose is business promotion)
• Trade magazine subscriptions

6. Professional and Financial Services

Fees paid for professional expertise to run your business are allowable.

You can claim:

• Accountant and bookkeeper fees
• Legal fees (for business contracts, disputes)
• Business bank charges and merchant fees
• Insurance premiums (professional indemnity, public liability, etc.)
• Debt collection costs

Note: Legal fees for buying assets (e.g., purchasing a property) are capital expenses, not allowable revenue expenses.

7. Equipment, Tools, and Technology

Under Annual Investment Allowance (AIA), you can deduct the full cost of most equipment in the year you buy it, up to £1 million per year.

Examples of claimable equipment:

• Laptops, computers, and tablets
• Smartphones used for business
• Specialist tools or machinery
• Camera equipment (for photographers, content creators)
• Vehicles (subject to capital allowance rules)

If an item has mixed personal and business use (e.g., a smartphone), you can only claim the business proportion.

8. Clothing and Uniforms

Personal clothing is not an allowable expense — even if you only wear it for work. However, protective clothing and branded uniforms are deductible.

Allowable clothing expenses:

• Protective gear: hard hats, hi-vis vests, safety boots
• Branded uniforms with your business logo
• Costumes for performers

9. Training and Professional Development

You can claim the cost of training that helps you maintain or improve skills you already use in your current business.

Allowable training costs:

• Courses and workshops related to your trade
• Professional certifications and renewals
• Books, journals, and reference materials
• Online learning platforms (LinkedIn Learning, Udemy, etc.)

Not allowable: Training to learn a completely new skill or enter a new profession.

10. Phone and Internet

If you use your phone or broadband for work, you can claim the business proportion.

• Dedicated business phone/line: 100% deductible
• Personal phone with business use: deduct only the business percentage
• Home broadband: apportion based on business use

11. Bank Interest and Finance Charges

If you borrow money for business purposes, the interest is an allowable expense.

• Business loan interest
• Overdraft charges
• Hire purchase interest (for business assets)
• Credit card charges on business purchases

12. Pensions

Sole traders can claim tax relief on pension contributions through the pension provider directly — this is handled separately from allowable expenses on your Self Assessment return but is equally important for reducing your overall tax liability.

Simplified Expenses: A Quicker Option for Some Costs

HMRC offers simplified expenses (flat rates) for certain costs, making record-keeping easier:

Simplified expenses are optional. If your actual costs are higher, use actual figures instead.

Common Mistakes Self-Employed People Make with Allowable Expenses

1. Forgetting to claim working-from-home costs — Even a flat £312/year adds up over a career.
2. Not keeping records — HMRC can request evidence going back 5 years. Always save receipts and invoices.
3. Claiming personal costs as business — This is tax fraud, not just an error. Be accurate.
4. Missing the Annual Investment Allowance — Many sole traders spread equipment costs over years unnecessarily.
5. Ignoring mileage — Manually logged journeys can add thousands in deductions annually.
6. Not claiming bank charges — Small but consistent fees are easily overlooked.
7. Mixing business and personal accounts — A dedicated business bank account makes expense tracking far easier.

How to Record and Claim Allowable Expenses

Step 1: Open a separate business bank account to keep finances clean.
Step 2: Save all receipts and invoices — digital copies are accepted by HMRC.
Step 3: Use accounting software (FreeAgent, QuickBooks, Xero) or a spreadsheet to categorise expenses monthly.
Step 4: Enter totals into the relevant boxes on your Self Assessment SA100/SA103 form.
Step 5: Submit your return by 31 January (online) or 31 October (paper) following the tax year end.

How Much Tax Can You Save by Claiming Allowable Expenses?

Here’s a simple illustration:

(Figures approximate; actual figures depend on personal allowance, NIC, and other reliefs.)

Frequently Asked Questions (FAQs)

What are allowable expenses for self employed people in the UK?

Allowable expenses for self employed individuals are legitimate business costs deducted from your income before tax is calculated. They must be incurred “wholly and exclusively” for business purposes under HMRC rules.

Can I claim allowable expenses without receipts?

HMRC recommends keeping records, but there is no strict legal requirement for receipts under £2,500 per item. However, in the event of an enquiry, evidence strengthens your position. Digital records are fully acceptable.

Can I claim my mobile phone as a self-employed expense?

Yes, partially. If your phone is used for both personal and business purposes, you can only claim the business proportion. A fully dedicated business phone is 100% deductible.

Are allowable expenses the same as tax relief?

They serve a similar purpose — reducing your tax bill — but are technically different. Allowable expenses reduce your taxable profit, while tax relief (such as pension contributions or the personal allowance) reduces your tax liability directly.

What expenses can I not claim as self-employed?

You cannot claim: personal clothing (unless a uniform or PPE), commuting costs to a regular workplace, entertaining clients (business entertainment is specifically excluded by HMRC), fines and penalties, and personal living costs.

How do I claim allowable expenses on my tax return?

On your Self Assessment return (SA103 short or long form), there are specific boxes for each expense category. Your total allowable expenses are deducted from your gross income to arrive at your taxable profit.

Can I claim the cost of my accountant as an allowable expense?

Yes. Accountancy fees are a fully allowable expense for self-employed individuals. This means the cost of getting professional help with your tax return is itself tax-deductible.

What is the difference between allowable expenses and capital allowances?

Allowable expenses cover day-to-day running costs (revenue expenditure). Capital allowances apply to larger purchases of long-term assets like equipment or vehicles. The Annual Investment Allowance lets you deduct most capital purchases in full in the year of purchase.

Conclusion: Claim Every Penny You’re Entitled To

Understanding and claiming all your allowable expenses for self-employed work is one of the smartest, most legal ways to reduce your tax bill in the UK. HMRC explicitly allows these deductions — not claiming them means you’re paying more tax than you should.

Whether you’re a freelance designer, a self-employed tradesperson, a consultant, or a sole trader in any industry, a thorough review of your expenses each year can save you hundreds or even thousands of pounds.

At Cheap Tax Returns UK, we help self-employed individuals across the UK file accurate, fully optimised Self Assessment tax returns at an affordable price. Our experts ensure you never miss a deductible expense.
Disclaimer: This article is for informational purposes only and does not constitute tax advice. For advice specific to your situation, consult a qualified accountant or tax adviser.