By
August 8, 2026
Allowable Business Expenses UK: What Can Your Business Claim?
Running a business comes with many costs, from office equipment and software to advertising, travel and professional fees. Understanding which costs can be claimed as allowable business expenses in the UK can help you calculate your taxable profit correctly and avoid paying more tax than necessary.
However, not every expense paid from a business account is automatically tax deductible. HM Revenue & Customs (HMRC) applies rules determining whether particular business costs can be deducted when calculating taxable profits.
This guide explains allowable business expenses, common expenses businesses may be able to claim, and the importance of maintaining accurate records.
Allowable business expenses are certain costs incurred in the course of running your business that can be deducted when calculating taxable profits.
A simple example is:
Business income: £80,000
Allowable business expenses: £20,000
Profit before other relevant tax adjustments: £60,000
This does not mean that HMRC refunds the entire £20,000 of expenses.
Instead, eligible expenses reduce the profit on which tax is calculated.
The actual tax treatment depends on your business structure and the nature of each expense.
One of the most important concepts when considering UK business expenses is whether a cost was incurred wholly and exclusively for the purposes of the trade.
For example, if your business purchases accounting software that is used exclusively to manage company finances, this is clearly connected with the business.
However, expenses with both personal and business purposes can be more complicated.
Business owners should therefore avoid assuming that anything purchased using a business bank card automatically qualifies as an allowable expense.
The rules can differ depending on whether you operate as a sole trader or through a limited company.
A sole trader is personally carrying on the business, while a limited company is a separate legal entity.
This distinction can affect how expenses are treated.
For limited companies, costs are generally incurred by the company for business purposes. Personal expenses paid by the company can create additional tax or accounting consequences.
For sole traders, the business and individual are not separate legal entities, although personal expenditure generally cannot simply be deducted as a business expense.
The following are common categories of expenditure that may qualify for tax relief when the relevant conditions are met.
Businesses commonly incur expenses for everyday office requirements.
Potential expenses can include:
Where something is used for both personal and business purposes, the treatment may depend on the circumstances and applicable tax rules.
If you operate from commercial premises, certain costs associated with running those premises may be deductible.
These can include:
However, purchasing business premises is treated differently from paying ordinary operating costs.
Many UK business owners operate partly or entirely from home.
Depending on your business structure and circumstances, it may be possible to claim certain costs associated with working from home.
These could relate to:
The amount that can be claimed depends on how the property is used and the method used to calculate the expense.
Sole traders and limited company directors can be subject to different rules, so it is important to use the appropriate method.
Advertising expenses incurred to promote a business are commonly relevant when calculating business profits.
Examples can include:
Branding, design and certain promotional costs may also qualify depending on the nature of the expenditure.
Most modern businesses require a website, and this can create several different expenses.
Common costs include:
The accounting and tax treatment can depend on whether the expenditure is considered a normal operating expense or creates a longer-term asset.
Businesses frequently use external professionals.
Potential allowable expenses can include fees paid for:
However, not all professional fees are automatically deductible. The reason the service was required can affect its tax treatment.
Insurance purchased for legitimate business purposes can often be included within business expenditure.
Examples include:
The policy should relate to the business rather than purely personal protection.
Businesses employing staff can incur substantial employment-related expenses.
These can include:
Different tax rules can apply to particular benefits and payments, so payroll and employee expenses should be recorded carefully.
Travel undertaken for genuine business purposes may qualify as a business expense.
Potential costs can include:
Ordinary commuting between home and a permanent workplace is generally treated differently from qualifying business travel.
Business owners should maintain records showing the purpose of business journeys.
Using a vehicle for business can create deductible expenses, but the rules depend on factors including business structure, vehicle ownership and how the vehicle is used.
Relevant costs may include:
Private use needs to be considered.
Keeping accurate mileage records can be particularly important where a vehicle is used for both personal and business journeys.
Equipment purchased for business purposes may qualify for tax relief.
Examples include:
Some purchases may be treated as capital expenditure rather than ordinary day-to-day expenses.
Tax relief may instead be available through applicable capital allowances or other rules.
Small businesses increasingly rely on subscription-based software.
Potential business expenses can include:
The subscription should be connected with running the business.
Business telephone and internet expenses can potentially be claimed.
Where a contract or device has mixed business and private use, the appropriate treatment will depend on the circumstances.
For limited companies, contracts taken out directly by the company can also have different implications from personally held contracts reimbursed by the company.
Businesses often pay financial service charges as part of normal trading.
These may include:
Interest and financing costs can have their own specific tax rules.
Businesses selling physical products normally incur costs purchasing goods or materials.
Examples include:
These costs form an important part of calculating the profit generated from selling products.
Inventory should also be accounted for correctly at the relevant accounting date.
Businesses selling goods may incur costs associated with getting products to customers.
Potential expenses include:
Importing goods can also create additional costs such as customs duties and import VAT, which may require different accounting treatment.
Certain training expenses may qualify when they relate to the existing business or help maintain and improve skills relevant to the current trade.
However, training that provides entirely new skills or prepares someone to begin a different business activity can be treated differently.
The purpose of the training is therefore important.
Certain subscriptions may be allowable where they are relevant to the business.
Examples can include:
Memberships that are primarily personal or unrelated to the business may not qualify.
Clothing is an area where businesses frequently misunderstand allowable expenses.
Ordinary clothing that could also be worn privately generally does not become deductible simply because it is worn while working.
However, qualifying costs may include certain:
The circumstances and nature of the clothing matter.
Sometimes a business invoices a customer but ultimately cannot collect the money.
Under certain circumstances, a genuine bad debt may receive appropriate accounting or tax treatment.
Businesses should maintain evidence showing that the debt is genuinely irrecoverable rather than simply late.
Not every cost connected in some way with being in business is deductible.
Potential examples of non-allowable or restricted expenditure can include:
There are exceptions and detailed rules within many categories, so individual circumstances matter.
Business entertainment is particularly important because many owners assume that taking a client to lunch is automatically tax deductible.
UK tax rules place restrictions on business entertainment expenses.
Even when an expense has a genuine business purpose, this does not necessarily mean it can be deducted for Corporation Tax or Income Tax purposes.
Businesses should therefore record entertainment separately from ordinary travel or subsistence expenses.
The tax treatment of food and meals depends heavily on the circumstances.
Buying lunch during an ordinary working day does not automatically create a deductible business expense.
However, certain subsistence costs associated with qualifying business travel may potentially be treated differently.
Keep receipts and records showing the business reason for the journey or expense.
A laptop purchased for business purposes may qualify for tax relief.
However, the method of obtaining relief can depend on whether it is treated as an ordinary expense or capital expenditure and on the accounting method and business structure involved.
Private use may also need to be considered.
Potentially.
The treatment depends on factors such as who owns the contract, whether the business is a sole trader or limited company, and whether there is personal use.
For a limited company, a mobile phone contract held directly in the company's name may be treated differently from reimbursing an employee or director for a personally owned contract.
Maintaining evidence of business expenditure is extremely important.
Useful records can include:
Modern accounting software often allows businesses to photograph or upload receipts and attach them directly to individual transactions.
This can make record keeping considerably easier.
Separating business and personal finances can simplify bookkeeping and reduce accounting errors.
Limited companies should normally use company banking facilities for company transactions.
Sole traders can also benefit from maintaining a dedicated account for business activity even where this is not legally required.
Clear separation makes it easier to identify genuine business expenses.
Consider a simplified example.
A business generates:
Revenue: £150,000
It incurs:
Allowable expenses: £60,000
Ignoring other tax adjustments, the remaining accounting profit would be:
£150,000 − £60,000 = £90,000
The tax calculation would then be based on the applicable taxable profit after considering the relevant tax rules and adjustments.
This demonstrates why correctly identifying and recording business expenses is important.
Business owners should avoid common expense mistakes such as:
Regular bookkeeping can help prevent these problems.
UK businesses should consider reviewing the following categories:
Whether a particular cost is deductible depends on the facts and applicable tax rules.
Allowable business expenses are certain costs that can be deducted when calculating taxable business profits, provided they meet the relevant tax rules.
No. Some expenditure is specifically restricted or disallowed, while other costs may need to be treated as capital expenditure rather than ordinary expenses.
Businesses should maintain sufficient records to support their income and expenses. Keeping receipts, invoices and other evidence is therefore strongly recommended and may be necessary to substantiate a claim.
Certain pre-trading expenses may potentially qualify for tax relief when specific conditions are met. The treatment depends on the type of expense and circumstances.
Yes. Limited companies can generally deduct qualifying business expenses when calculating taxable profits, subject to the applicable rules.
Yes. Sole traders can generally deduct qualifying allowable expenses when calculating taxable trading profits.
Understanding allowable business expenses in the UK is an important part of managing your company's finances and tax obligations.
The key principle is not simply whether money was spent through the business, but why the expense was incurred and how it relates to the business.
Accurate bookkeeping, separate business finances and good record keeping can make identifying allowable expenses much easier.
Where an expense has both personal and business use, involves a significant asset, or falls into a complicated area such as vehicles, entertainment, travel or working from home, consider checking current HMRC guidance or seeking professional tax advice before claiming it.
