Corporation Tax Disallowable Expenses Explained by Accountants in London
Many business owners assume that all company expenses reduce their tax bill, but UK tax rules do not allow every expense to be deducted when calculating profits.
When preparing company accounts and submitting Corporation Tax returns to HM Revenue & Customs (HMRC), certain costs must be added back to profits because they are considered disallowable expenses.
Understanding these rules can help businesses avoid mistakes, reduce the risk of tax enquiries, and ensure accurate tax reporting.
At S & B Accountants Ltd, trusted Accountants in Bethnal Green, East London, we regularly assist businesses across London with identifying allowable and disallowable expenses before submitting their Corporation Tax returns.
Client Entertainment, Client Meetings and Client Gifts
Client Entertainment
Client entertainment refers to hospitality provided to customers, suppliers, or potential clients.
Common examples include:
Taking a client to a restaurant
Drinks with a prospective customer
Sporting event tickets for clients
Corporate hospitality
According to HM Revenue & Customs guidance, client entertainment is not tax deductible for Corporation Tax purposes.
This means the cost may appear in the accounts but must be added back when calculating taxable profit.
Example
If a company spends £150 taking a client to dinner, the expense is recorded in the accounts but must be added back when calculating the final Corporation Tax liability.
Client Meetings
Client meetings are treated differently.
Expenses may be allowable when they are directly related to conducting business rather than entertaining.
Allowable examples may include:
Coffee during a meeting
Light refreshments at the office
Meeting room hire
However, if the meeting involves restaurant meals or hospitality, it usually becomes client entertainment and is therefore disallowable.
Client Gifts
Client gifts may be allowable if they meet strict rules set by HM Revenue & Customs.
A gift to a client can be tax deductible if:
It costs £50 or less per person per year
It contains clear advertising or branding
It is not food, drink, tobacco, or a voucher
Allowable examples
Branded pens
Promotional calendars
Branded notebooks
Disallowable examples
Wine or alcohol
Gift hampers
Shopping vouchers
Many businesses mistakenly assume small gifts are always deductible, but the rules can be stricter than expected.
Common Corporation Tax Disallowable Expenses
In addition to client entertainment, there are several general expenses that businesses cannot deduct for tax purposes.
Experienced small business accountants will normally review these items when preparing company tax computations.
Depreciation
Accounting depreciation on assets such as:
Computers
Furniture
Vehicles
Equipment
is not allowed for Corporation Tax purposes.
Instead, companies may claim capital allowances under the Capital Allowances Act 2001.
Fines and Penalties
Fines and penalties imposed by authorities are always disallowable.
Examples include:
Late filing penalties from HM Revenue & Customs
Late filing penalties from Companies House
Parking fines
Speeding fines
These expenses must be added back when calculating taxable profit.
Corporation Tax
The Corporation Tax itself cannot be deducted as an expense.
Any Corporation Tax provision included in the accounts must be added back in the tax computation.
Personal Expenses
Expenses that are not wholly and exclusively for business purposes are disallowable.
Examples may include:
Personal travel paid by the company
Personal mobile phone bills
Family expenses
Personal subscriptions
It is important to separate personal and business costs to ensure compliance with tax regulations.
Capital Expenses
Items that should be treated as capital assets rather than expenses may also be disallowed.
Examples include:
Office furniture
Business equipment
Computers
Vehicles
These items should normally be recorded as fixed assets, and tax relief may be available through capital allowances.
Political Donations
Donations made to political parties are not tax deductible for Corporation Tax purposes.
Why Accurate Expense Classification Matters
Incorrectly claiming disallowable expenses can lead to:
Incorrect Corporation Tax calculations
Amendments to tax returns
Possible enquiries from HM Revenue & Customs
This is why many businesses rely on experienced accountants in London to review their accounts before submitting tax returns.
How S & B Accountants Ltd Can Help
At S & B Accountants Ltd, our experienced Chartered Certified Accountants help businesses across London with:
Company accounts preparation
Corporation Tax returns
Expense reviews
Tax compliance and planning
As trusted accountants in Bethnal Green, East London, we specialise in supporting small businesses, startups, and growing companies.
Our team ensures that expenses are correctly classified so your tax returns remain compliant with the rules set by HM Revenue & Customs.
Speak to Small Business Accountants in London
If you are unsure whether certain expenses are allowable for tax purposes, professional advice can help prevent costly mistakes.
S & B Accountants Ltd provides expert support to businesses across London, helping them manage accounts, reduce tax risks, and stay compliant with UK tax regulations.