Allowable Expenses for the Self-Employed: What You Can Claim

One of the most valuable aspects of being self-employed is the ability to deduct legitimate business expenses from your income before calculating your tax bill. However, many self-employed individuals either miss out on valuable deductions or make costly errors by claiming expenses they're not entitled to. Understanding what you can and cannot claim is crucial for minimising your tax liability whilst staying compliant with HMRC rules.

The Golden Rule: Wholly and Exclusively

The fundamental principle governing business expenses is that they must be incurred "wholly and exclusively" for business purposes. This doesn't mean you can't claim anything with dual purpose, but the business element must be identifiable and justifiable.

For example, if you use your mobile phone for both business and personal calls, you can claim the business proportion. If you take a client out for lunch and discuss business, that's allowable. If you take your family out for Sunday lunch, it's not – even if you briefly mention work.

Office and Premises Costs

If You Work From Home

As we discussed in yesterday's blog, you can claim a proportion of household costs including rent or mortgage interest, Council Tax, utility bills, internet and telephone, and building and contents insurance. Use either HMRC's simplified expenses rates or calculate actual costs based on business use proportion.

If You Rent Business Premises

You can claim the full cost of business rent, business rates, utility bills for the premises, building insurance, and maintenance and repairs.

Travel and Vehicle Expenses

Business Mileage

If you use your personal vehicle for business, you can claim 45p per mile for the first 10,000 business miles per year, then 25p per mile thereafter. This simplified rate covers all vehicle costs including fuel, insurance, servicing, and depreciation.

What counts as business mileage:

• Travelling to see clients or customers
• Travelling between different work locations
• Travelling to temporary workplaces
• Business errands (bank, suppliers, post office)

What doesn't count:

• Your daily commute from home to a permanent workplace
• Personal journeys
• Travel between home and a regular client if they're considered your permanent workplace

Critical requirement: You must keep a detailed mileage log showing date, destination, purpose, and miles travelled. Without this, HMRC will disallow the claim.

Alternative Method: Actual Vehicle Costs

Instead of mileage rates, you can claim actual costs including fuel, insurance, servicing and repairs, MOT, vehicle excise duty, breakdown cover, and lease or hire purchase payments. However, you can only claim the business proportion. If you drive 10,000 miles per year and 6,000 are for business, you can claim 60% of all vehicle costs.

Note: Once you choose a method for a particular vehicle, you generally cannot switch to the other method for that vehicle.

Other Travel Costs

You can claim train, bus, and taxi fares for business journeys, flights for business trips, parking charges (excluding fines), tolls and congestion charges, and hotel accommodation for business trips.

Staff and Employee Costs

If you employ staff (including family members), you can claim wages and salaries, employer's National Insurance contributions, pension contributions, employee benefits (within limits), recruitment costs, and staff training costs.

Important: If you employ family members, they must genuinely work for the business, be paid a reasonable rate for the work they do, and have the necessary skills for the role. HMRC scrutinises these arrangements closely.

Professional Fees and Subscriptions

You can claim accountancy fees, legal fees for business matters, professional indemnity insurance, trade body or professional membership subscriptions, and fees for business advice and consultancy.

What you cannot claim: fines and penalties, legal costs for buying business assets, or costs of setting up a new business (these are capital costs).

Marketing and Advertising

All costs of promoting your business are allowable including website design and hosting, social media advertising, printed marketing materials (business cards, flyers, brochures), Google Ads or other online advertising, sponsorship of local events or sports teams, and networking event costs.

Office Equipment and Supplies

You can claim stationery and postage, printing costs, computer software and subscriptions, small equipment (under £500 per item typically claimed as revenue expense), and protective clothing or uniforms with your business name/logo.

Capital items: Expensive equipment (computers, machinery, vehicles) are capital assets. You claim these through capital allowances rather than as expenses. We'll cover this in detail in a future blog.

Communication Costs

You can claim business telephone calls and line rental (business proportion), mobile phone costs (business proportion), internet costs (business proportion), and postage and courier services.

If you have a contract that's purely for business (a dedicated business mobile), you can claim 100%. If you use your personal phone for business too, claim a reasonable business proportion.

Bank Charges and Financial Costs

Allowable costs include business bank account charges, interest on business loans or overdrafts, credit card charges for business transactions, merchant services fees, and accountancy software subscriptions (Xero, QuickBooks, FreeAgent, etc.).

What you cannot claim: interest on personal loans used to fund the business (though the loan capital may qualify for relief in some circumstances), or penalties for late payment of taxes.

Training and Development

You can claim training courses to update or maintain your existing skills and knowledge, professional development relevant to your current business, and training for employees.

What you cannot claim: courses to learn entirely new skills unrelated to your current business, or qualifications that could help you start a different career.

For example, if you're a web designer taking an advanced coding course, that's allowable. If you're a web designer taking an accountancy qualification to change careers, it's not.

Insurance

Business-related insurance is allowable including professional indemnity insurance, public liability insurance, contents insurance for business equipment, business interruption insurance, and key person insurance.

What you cannot claim: life insurance (unless it's a condition of a business loan), or personal health insurance.

Entertainment and Subsistence

Client Entertainment

Here's a frustrating rule: you cannot claim for entertaining clients or potential clients. This includes meals, drinks, events, or hospitality for clients. Even if it's entirely for business purposes and helps you win contracts, it's specifically disallowed.

Staff Entertainment

You can claim for entertaining your employees, such as a Christmas party or team lunch, provided it's available to all staff and doesn't exceed £150 per person per year.

Subsistence

You can claim for your own meals and accommodation whilst travelling on business overnight, but not for your regular lunch during a normal working day, even if you're working from home or at a client's premises.

Clothing

This is another area where HMRC is strict. You can claim for protective clothing required for your work (hard hat, high-vis, steel-toed boots), uniforms with your company logo, and costumes if you're a performer.

You cannot claim for ordinary business clothing, even if you only wear it for work. That smart suit or those professional shoes? Not allowable, even if you'd never wear them outside of work.

Commonly Overlooked Expenses

Many self-employed people miss these legitimate claims:

• Business mileage for short journeys (to the post office, bank, suppliers)
• Proportion of home internet costs
• Professional subscriptions and journals
• Business insurance premiums
• Software subscriptions (Adobe, Microsoft 365, project management tools)
• Domain name registration and website hosting
• Books and publications relevant to your business
• Trade magazine subscriptions
• Professional photography for your website or marketing
• Cleaning costs for business premises or business areas of home

Expenses You Cannot Claim

To avoid HMRC enquiries and penalties, never claim for:

• Personal expenses (gym membership, personal clothing, personal meals)
• Entertaining clients or potential clients
• The business element of your personal Income Tax, National Insurance, or Self Assessment bill
• Money you've taken from the business for personal use (drawings)
• Capital costs (buying assets – these go through capital allowances instead)
• Fines and penalties
• Donations to political parties
• Most depreciation (except for certain vehicles)

Record-Keeping Requirements

For every expense you claim, you must keep evidence including receipts or invoices, bank statements showing payment, contracts or agreements, and a record of the business purpose.

HMRC can ask to see evidence for any expense up to six years after the relevant tax year. Records can be paper or digital (scanned receipts are fine), but they must be clear and legible.

Top Tips for Record-Keeping:

• Photograph receipts on your phone immediately – till receipts fade quickly
• Use accounting software to categorise expenses as you go
• Keep a dedicated business bank account to separate business and personal spending
• Keep a digital or physical mileage log in your car
• Note the business purpose on receipts (who you met, what you discussed)
• Back up digital records regularly

The Duality Principle

When expenses have both business and personal benefit (duality of purpose), HMRC's approach is strict. The entire expense may be disallowed if the personal benefit is more than incidental.

For example, if you buy a suit for client meetings, HMRC will argue you also get personal benefit from owning the suit, so it's not allowable. However, if you work from home, the personal benefit of heating your house is considered incidental to the business purpose, so you can claim a proportion.

When in doubt, ask yourself: "Would I have incurred this cost if I wasn't running this business?" If the answer is no, it's likely allowable.

What If You're Not Sure?

If you're uncertain whether an expense is allowable, it's better to seek professional advice than to either miss out on a legitimate claim or risk an HMRC enquiry by claiming something you shouldn't.

An experienced accountant can review your circumstances, ensure you're claiming everything you're entitled to, help you understand the difference between revenue and capital expenditure, and provide peace of mind that your expenses are properly documented and justified.

Need help identifying all your allowable expenses? MCC Partners specialises in helping self-employed individuals and small businesses throughout Gravesend and Kent maximise their tax efficiency whilst staying fully compliant with HMRC rules. Contact us on 01474 619 990 or email This email address is being protected from spambots. You need JavaScript enabled to view it. for expert guidance.