What Expenses Can You Claim on Your UK Self Assessment Tax Return?

Author : Fred Michael & Co Ltd | Published On : 13 Nov 2026

Understanding which business expenses you can claim on your UK Self Assessment tax return can help you reduce your taxable profits and manage your finances more effectively. Whether you are a sole trader, freelancer or self-employed professional, knowing which costs qualify for tax relief is an important part of running a business.

Many business owners miss allowable expenses because they are unsure what HMRC permits. Keeping accurate records, understanding tax rules and seeking professional guidance can help you avoid mistakes and ensure you claim the expenses you are entitled to.

1. Office and Business Running Expenses

If you operate a business, you can generally claim expenses incurred wholly and exclusively for business purposes. These may include office rent, electricity, heating, business telephone costs, internet subscriptions and stationery.

If you work from home, you may be able to claim a reasonable proportion of household expenses, including heating, electricity, rent or mortgage interest. Alternatively, eligible self-employed individuals can use HMRC's simplified expenses method to calculate certain home-working costs.

2. Travel and Vehicle Expenses

Business-related travel is another common category of allowable expenses. Depending on your circumstances, you may be able to claim:

• Business-related train, bus and taxi fares.

• Hotel accommodation for qualifying business trips.

• Parking fees and road tolls.

• Business mileage when using your personal vehicle.

• Vehicle insurance, repairs and fuel under the appropriate calculation method.

However, ordinary journeys between your home and permanent workplace are generally considered personal commuting and cannot be claimed as business expenses. Maintaining accurate mileage records and receipts helps support your claims.

3. Marketing and Advertising Costs

Promoting your business involves expenses that may qualify for tax relief. These can include website hosting, online advertising campaigns, search engine marketing, business photography and printed promotional materials.

For example, if you pay for online advertising to attract customers or maintain a business website, these costs may qualify as allowable expenses. However, client entertainment and certain hospitality expenses are generally not deductible.

4. Staff and Payroll Expenses

Businesses employing workers may claim various qualifying staff-related costs. These can include employee salaries, employer pension contributions, employer National Insurance contributions and certain staff training expenses.

Businesses using professional payroll services for small business in London can also benefit from organised payroll administration and accurate employee payment records. Similarly, business payroll services in London can help employers manage salary calculations, statutory deductions and payroll reporting requirements.

5. Professional Fees and Accounting Services

Professional support is another important area of business expenditure. Self-employed individuals can generally claim qualifying accountancy fees, bookkeeping charges, professional subscriptions and certain legal or consultancy costs incurred for business purposes.

However, HMRC does not allow the cost of preparing and submitting your personal Self Assessment tax return as an allowable business expense.

Working with experienced tax return accountants in London can help business owners understand allowable expenses, organise financial records and prepare accurate tax returns.

6. Insurance, Bank Charges and Financial Costs

Business insurance protects companies against unexpected financial risks. Depending on the policy, you may claim expenses such as public liability insurance, professional indemnity insurance and business insurance premiums.

Other potentially allowable costs include business bank charges, overdraft fees, qualifying loan interest and credit card charges related to business activities. Personal financial expenses and loan repayments cannot generally be claimed.

7. Equipment, Stock and Training Expenses

Businesses may also claim qualifying costs associated with purchasing stock, raw materials, tools and equipment. The treatment of equipment depends on the accounting method used. Capital allowances may apply under traditional accounting, while different rules generally apply under cash basis accounting.

Training courses can qualify when they help improve existing skills or knowledge relevant to your current business activities.

8. Why Professional Tax Advice Matters

Understanding tax rules can be challenging, particularly when business and personal expenses overlap. A small business financial advisor in London can help review financial performance, improve budgeting and support better financial decisions.

Businesses researching the top accounting firms in London should consider professional experience, service range and understanding of their industry. Some may also choose to outsource tax preparation services London to simplify tax administration.

For wider financial guidance, a Virtual Finance Director in London can help businesses monitor performance, plan expenditure and develop long-term financial strategies.

How Fred Michael & Co Ltd Can Help

Choosing the right financial support can make managing business expenses and tax responsibilities easier. Fred Michael & Co Ltd provides bookkeeping and accounting, business planning and financial advice, payroll, credit control, tax and VAT services, and virtual finance director support.

Professional assistance can help businesses maintain organised records, understand their financial position and prepare for important tax deadlines.

Final Thoughts

Claiming the correct business expenses is an important part of managing your UK Self Assessment tax return. From office costs and travel to staff salaries, insurance and professional fees, understanding allowable expenses can help reduce taxable profits and improve financial management.

Keep accurate records, separate personal and business spending, and seek professional advice whenever you are unsure about a particular expense. Good financial organisation throughout the year can make tax return preparation considerably easier.