Can You Claim for a Home Office to Save Tax

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    Written by:

    Steven Hillman FCA

    Chartered Accountant

    Updated on:

    3 March 2026

    Benefit, in kind (BIK) tax is applicable when a company or employer covers expenses for directors or employees. For instance, if the company pays for an employee's loft or garage fees. If a company pays for a garden office that is also used privately by family members or for business purposes it will incur a benefit in kind charge. This may also result in limitations on allowances for the business since the property must be exclusively used for business purposes .

    Claiming Use of Home as Office Expenses


    Working from home has become normal for many business owners, freelancers and company directors. One of the questions that often follows is whether you can claim part of your home costs against your business.


    The answer is yes, but the rules are quite specific and it’s important to get them right.


    When can you claim?


    To claim use of home as an office, the expense must meet HMRC’s usual rule. It has to be incurred wholly and exclusively for the purposes of your business.


    In practice, this means:


    • You must be using part of your home for work
    • The claim must be reasonable and proportionate


    The space does not need to be used exclusively for business, but if there is a mix of personal and business use, you need to adjust your claim accordingly.


    What costs can you claim?


    If you work from home, you can claim a proportion of certain household costs.


    These can include:


    • Rent or mortgage interest (not capital repayments)
    • Gas and electricity
    • Water
    • Council tax
    • Broadband and phone costs
    • Cleaning


    The key point is that you only claim the business proportion. This is usually based on a mix of:


    • the number of rooms used
    • the amount of time the space is used for work


    There isn’t a single “correct” method, but the approach needs to be reasonable and consistent.


    Simplified expenses (flat rate method)


    If you are self-employed, HMRC offers a simplified method which avoids detailed calculations.


    This is based on the number of hours you work from home each month:


    • 25 to 50 hours: £10 per month
    • 51 to 100 hours: £18 per month
    • 101 hours or more: £26 per month


    This method is straightforward and requires minimal record keeping, but it may not give the highest claim.


    Actual cost method


    The alternative is to claim a proportion of your actual household costs.


    This involves:


    • calculating how much of your home is used for business
    • adjusting for how often that space is used


    For example, if one room out of five is used for work, you might start with 20%. If that room is only used for business part of the time, you would reduce the claim further.


    This method is more accurate, but requires good records and a bit more calculation.


    Limited company directors


    If you operate through a limited company, the approach is slightly different.


    The simplest option is to claim a flat £6 per week from your company without needing detailed records.


    Alternatively, you can charge your company a higher amount based on actual costs, but this requires more documentation and needs to be justified.


    Things to watch out for


    There are a couple of common mistakes to avoid.


    Over-claiming is the main one. Your claim must always reflect the business use of your home. Claiming too much can create problems if HMRC ever reviews your figures.


    You also need to keep records. Even if you are using a simple method, you should still be able to explain how you arrived at your figures.


    Finally, be careful with rooms used exclusively for business. While this can increase your claim, it can also have capital gains tax implications when you sell your home.


    Building a garden office


    A garden office is an attractive option if you want a dedicated workspace, but the tax treatment is often misunderstood.


    Corporation tax and capital allowances


    If a limited company pays for a garden office, the cost of the structure itself is usually treated as capital expenditure.


    In most cases, this means:


    • you do not get a corporation tax deduction for the building
    • it does not qualify for plant and machinery allowances


    However, certain elements may qualify for capital allowances, such as:


    • electrical installations
    • lighting and heating systems
    • some fixtures and fittings


    Ongoing costs like heat, light, repairs and maintenance are generally allowable.


    VAT


    If your business is VAT registered, you may be able to reclaim VAT on costs that relate to business use.


    Where there is mixed use, you can only reclaim the business proportion.


    Benefit in kind


    If a company provides a garden office and there is any personal use, this can create a benefit in kind charge.


    To avoid this, the office would need to be used wholly for business purposes.


    Business rates and council tax


    In some cases, business rates may apply if part of your property is used for business.


    This depends on the level of use and whether the space is considered separate from the main home.


    Capital gains tax


    If part of your home is used exclusively for business, it can affect your entitlement to full Principal Private Residence relief when you sell the property.


    In simple terms, the portion used purely for business could become subject to capital gains tax.


    This is often overlooked, but it is an important consideration.


    Other practical considerations


    There are also a few non-tax points to think about.


    You may need to:


    • inform your insurer
    • check whether planning permission is required
    • speak to your mortgage lender


    These will depend on your specific circumstances.


    Final thoughts


    Working from home can provide legitimate tax relief, but the claims need to be reasonable and properly supported.


    The rules are not complicated, but there are areas where it is easy to get caught out, particularly with larger claims or more permanent setups like garden offices.

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