What Business Expenses Can I Claim? The Complete UK Guide

Every pound you spend on legitimate business expenses reduces your taxable profit — and therefore your tax bill. Yet thousands of UK business owners overpay their taxes every year simply because they do not claim all the expenses they are entitled to.

Whether you are a sole trader or running a limited company, this guide covers every category of allowable business expense, the deductions people commonly miss, expenses you definitely cannot claim, and how to keep records that will satisfy HMRC.

The Golden Rule: Wholly and Exclusively

Before diving into specific expenses, you need to understand HMRC's fundamental test. An expense is allowable if it is incurred "wholly and exclusively for the purposes of the trade".

This does not mean the expense must have zero personal benefit — only that the purpose of the expenditure must be entirely business-related. For example, you might enjoy a business trip, but if the trip's purpose is genuinely business, the cost is deductible.

Categories of Allowable Business Expenses

Office and Premises Costs

• Rent for business premises
• Business rates and water rates
• Utility bills — gas, electricity, water (business proportion)
• Office supplies — stationery, printer ink, postage
• Cleaning and maintenance costs
• Security systems and alarm monitoring
• Insurance — buildings, contents, public liability

Travel and Transport

• Business mileage at HMRC approved rates (45p per mile for the first 10,000 miles, 25p thereafter)
• Public transport — trains, buses, taxis for business journeys
• Parking fees for business trips
• Hotel accommodation for overnight business stays
• Meals during overnight business travel (reasonable costs)
• Congestion charges and tolls on business routes
• Vehicle running costs if you use the actual cost method (fuel, insurance, MOT, repairs — business proportion only)

Important: Travel between your home and regular workplace is not an allowable expense. It is considered commuting.

Staff Costs

• Salaries and wages (including director salaries)
• Employer National Insurance contributions
• Employer pension contributions
• Staff training and professional development
• Recruitment fees — agency costs, job advertising
• Employee benefits — health insurance, gym memberships (taxable as BIK)
• Statutory payments — sick pay, maternity pay
• Staff welfare — tea, coffee, and modest refreshments for employees

Professional and Financial Services

• Accountancy and bookkeeping fees
• Legal fees related to business operations
• Professional subscriptions — trade bodies, professional organisations
• Bank charges and business account fees
• Credit card fees on business transactions
• Debt collection costs
• Consultancy fees for business advice

Marketing and Sales

• Website costs — hosting, domain names, design, maintenance
• Advertising — online ads, print media, flyers
• Business cards and printed materials
• Trade show attendance and exhibition costs
• PR and marketing agency fees
• Software subscriptions — CRM, email marketing, SEO tools
• Client entertainment — note: not deductible for tax but can be recorded as a business cost

Technology and Equipment

• Computers, laptops, tablets — full cost via Annual Investment Allowance
• Software — subscriptions and licences
• Phones and mobile contracts (business proportion)
• Printers, scanners, office equipment
• Specialist tools and machinery for your trade

Insurance

• Professional indemnity insurance
• Public liability insurance
• Employer liability insurance (legally required if you have staff)
• Business contents insurance
• Cyber insurance
• Key person insurance (some policies)

Commonly Overlooked Expenses

These are legitimate deductions that many business owners forget to claim:

• Use of home as office — you can claim a proportion of home costs (mortgage interest/rent, council tax, utilities, broadband) based on the business use of your home. HMRC also allows a simplified flat rate: £6 per week without evidence needed, or £26/month for 25-50 hours of home working.
• Pre-trading expenses — costs incurred up to 7 years before you started trading, provided they would have been allowable if incurred after starting.
• Training courses that maintain or update existing skills (not training in a completely new field).
• Professional subscriptions — membership of professional bodies, trade journals.
• Trivial benefits — gifts to employees worth £50 or less (not cash) are exempt from tax and NI.
• Eye tests — if you use a computer for work, eye test costs are allowable.
• Protective clothing and uniforms — branded workwear, safety equipment, protective clothing.

Expenses You CANNOT Claim

Be aware of these common traps:

• Client entertaining — meals, drinks, or gifts for clients are not tax-deductible (even though they are a legitimate business cost)
• Fines and penalties — parking fines, speeding tickets, HMRC penalties
• Personal expenses disguised as business costs
• Clothing that could be worn outside work (even if you only wear it for business)
• The personal proportion of any mixed-use expense
• Capital expenditure — you cannot deduct the cost directly; instead, claim capital allowances
• Donations to political parties

Home Office Rules in Detail

If you work from home, you have two options for claiming:

Option 1: Simplified method (flat rate)

• 25-50 hours/month working from home: £10/month
• 51-100 hours/month: £18/month
• 101+ hours/month: £26/month

Option 2: Actual costs (apportioned)

Calculate the proportion of your home used for business. For example, if you have a dedicated office that is 1 of 5 rooms, you can claim 20% of:

• Mortgage interest or rent
• Council tax
• Utility bills
• Broadband
• Home insurance

The actual cost method usually gives a larger deduction but requires more record-keeping.

HMRC Mileage Rates (2024/25)

Vehicle Type	First 10,000 miles	Above 10,000 miles
Car or van	45p per mile	25p per mile
Motorcycle	24p per mile	24p per mile
Bicycle	20p per mile	20p per mile

These rates cover fuel, insurance, road tax, wear and tear, and maintenance. If you use approved mileage rates, you cannot also claim actual vehicle running costs.

Record-Keeping Tips

HMRC can enquire into your tax return up to 6 years after the end of the tax year (or 20 years if they suspect fraud). Keep:

• Receipts for every expense claimed
• Bank statements showing business transactions
• Mileage logs with date, destination, purpose, and miles
• Invoices you have issued and received
• Contracts and agreements

Digital records are acceptable. Photograph receipts and store them securely — faded paper receipts are a common problem.

How TaxDocs Can Help

Tracking expenses across multiple categories and ensuring you claim everything you are entitled to is a significant admin burden. TaxDocs helps you generate accurate, professionally formatted tax documents that account for all your allowable expenses. Upload your financial data and let TaxDocs handle the complexity — producing HMRC-ready documents in minutes.

The Bottom Line

Claiming all your legitimate business expenses is not aggressive tax planning — it is simply paying the correct amount of tax. Review your expenses regularly, keep thorough records, and make sure you are not leaving money on the table.

This article is for informational purposes only and does not constitute tax advice. Always consult a qualified accountant for advice specific to your circumstances.