How to Claim Business Expenses to Save Tax

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    Written by:

    Steven Hillman FCA

    Chartered Accountant

    Updated on:

    21 July 2025

    How to Claim Business Expenses When You’re Self-Employed


    If you’re self-employed, one of the most important things to understand is how business expenses work.


    Get this right, and you reduce your tax bill. Get it wrong, and you risk overpaying tax or running into issues with HMRC.


    The key point is simple. You only pay tax on your profit, not your income.


    What Is a Business Expense?


    A business expense is a cost that you incur wholly and exclusively for the purposes of your business.


    When you claim expenses, you are not getting the money back. You are reducing your taxable profit.


    For example:


    • You earn £100
    • You spend £10 on business costs
    • Your profit is £90


    You are taxed on £90, not £100.


    That is how expenses reduce your tax bill.


    What Expenses Can You Claim?


    There are a number of common categories of allowable expenses.


    These include:


    • Business premises such as rent, utilities and insurance
    • Office costs including software, phone and internet
    • Professional fees such as accountancy and legal costs
    • Travel costs for business journeys
    • Cost of goods such as stock and materials
    • Marketing and advertising
    • Staff costs, including wages and uniforms


    If an expense is partly personal and partly business, you can only claim the business portion.


    Capital Allowances


    Some purchases are not treated as day-to-day expenses.


    If you buy larger items such as:


    • equipment
    • tools
    • machinery


    You can usually claim capital allowances, which still reduce your taxable profit.


    In many cases, this relief is available in full in the year of purchase.


    What You Cannot Claim


    Not everything is allowable.


    Common examples of non-allowable expenses include:


    • Personal expenses
    • Travel between home and a permanent workplace
    • Client entertainment
    • General clothing that can be worn outside of work
    • The purchase of business premises


    Training costs must also relate to your existing business activities. Training for a new trade is not usually allowable.


    Keeping Good Records


    Good record keeping is essential.


    You should keep:


    • receipts
    • invoices
    • bank records


    HMRC does not usually ask for evidence when you submit your tax return, but they can request it later.


    If you cannot support your claims, expenses may be disallowed.


    How to Claim Expenses


    When you complete your tax return, you include your total allowable expenses.


    These are deducted from your income to calculate your profit.


    This is what your tax is based on.


    If you are unsure whether something is allowable, it is always better to check before including it.


    Using Digital Tools


    Most businesses now use software to manage their records.


    Tools like Xero and QuickBooks, often supported by systems like Dext, can help you:


    • capture receipts as you go
    • keep records organised
    • reduce manual data entry
    • prepare for your tax return more efficiently


    Having everything in one place makes the whole process much easier.


    What About Simplified Expenses?


    In some cases, you can use simplified expenses instead of tracking actual costs.


    This applies to things like:


    • working from home
    • vehicle use
    • living in your business premises


    This approach uses flat rates set by HMRC and can save time, although it is not always the most tax-efficient option.


    Trading Allowance


    If your total trading income is £1,000 or less, you may not need to pay tax on it.


    If your income is higher, you can choose between:


    • claiming the £1,000 trading allowance
    • or claiming actual business expenses


    You cannot use both. You should choose whichever gives the better result.


    Final Thoughts


    Claiming business expenses properly is one of the simplest ways to reduce your tax bill.


    Most of the benefit comes from:


    • understanding what you can claim
    • keeping good records
    • applying the rules correctly


    If you miss expenses, you will almost certainly pay more tax than you need to.

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