Allowable expenses for limited companies explained

Allowable expenses can significantly reduce a limited company’s corporation tax bill by lowering taxable profits. Understanding what you can and cannot claim is an important part of managing costs, staying compliant with HMRC rules, and improving overall tax efficiency.

This guide explains how allowable expenses work for UK limited companies, what typically qualifies, and how to manage expenses correctly.

What are allowable expenses for limited companies?

Allowable expenses are business costs that can be deducted from your company’s profits before corporation tax is calculated.

To qualify, an expense must be incurred wholly and exclusively for business purposes. This means the cost must relate entirely to running the company and cannot include personal or private expenditure.

When claimed correctly, allowable expenses reduce your taxable profits and, in turn, the amount of corporation tax your company pays.

How allowable expenses affect profits and corporation tax

When you submit your Company Tax Return, you deduct allowable expenses from your total income to arrive at your taxable profit.

Lower taxable profit means a lower corporation tax bill. The more legitimate expenses you claim, the less tax the company pays, freeing up cash that can be reinvested into the business.

This is why accurate expense tracking and claims are a key part of tax planning for limited companies.

What does ‘wholly and exclusively’ mean in practice?

HMRC’s “wholly and exclusively” rule means the expense must be incurred purely for business reasons.

Costs with any personal element are generally not allowable, unless they can be clearly apportioned. For example, a mobile phone used partly for personal calls would need to be split between business and private use.

Expenses such as client entertainment and personal living costs do not qualify, even if there is a business benefit.

Common categories of allowable business expenses

Many everyday running costs qualify as allowable expenses. Common examples include:

Staff costs

Salaries, wages, employer’s National Insurance contributions, and workplace pension contributions are allowable, provided the employment relates solely to the business.

Office costs

You can usually claim for office rent, business rates, utilities, phone and broadband, and office supplies such as stationery and printer consumables.
If you work from home, a proportion of household costs may also be allowable.

Travel and subsistence

Business travel costs such as mileage, train fares, flights, accommodation, and meals can be claimed when travel is necessary for work purposes. Personal travel and entertainment are excluded.

Professional fees

Fees paid to accountants, tax advisers, solicitors, and other professional advisers are allowable where the advice relates to the company’s affairs rather than personal matters.

Marketing and advertising

Most advertising and promotional costs are allowable, including digital marketing, website costs, and printed materials. However, business entertainment and some capital expenditure may not qualify.

Equipment, IT, and software

Computers, machinery, tools, and business software can be claimed, subject to capital allowance rules. Assets must be used for business purposes.

Expenses you cannot claim as a limited company

Some costs are specifically excluded under HMRC rules, including:

• Client and business entertainment
• Fines and penalties
• Directors’ or employees’ personal expenses
• Certain capital costs that do not qualify for capital allowances

Claiming non-allowable expenses can lead to adjustments, penalties, and interest if identified during an HMRC review.

Are charitable donations tax deductible for companies?

Yes. Limited companies can usually deduct charitable donations from their taxable profits, provided the recipient is a registered charity or qualifying organisation.

Donations can include cash, equipment, land, property, shares, and sponsorship payments, as long as the conditions are met.

Record-keeping and HMRC compliance

To claim an expense, you must be able to evidence it. This typically means keeping invoices or receipts showing:

• The amount paid
• The supplier
• Whether VAT was charged

Good bookkeeping systems are essential. Many businesses use cloud accounting software to maintain accurate records and a clear audit trail.

HMRC may request access to your records during a compliance check, so organised documentation helps avoid delays and potential penalties.

How long should you keep receipts and records?

Limited companies must keep financial records for six years from the end of the accounting period they relate to.

Records may need to be kept longer if:

• A transaction spans multiple accounting periods
• The asset is expected to last more than six years
• A Company Tax Return was submitted late
• HMRC has opened a compliance check

Maximising tax efficiency through expenses

Tax efficiency is about using legitimate allowances, reliefs, and structures to reduce corporation tax while remaining fully compliant.

Managing expenses correctly plays a major role in this process.

Making use of available allowances

Limited companies may be able to claim additional reliefs, such as:

• Capital allowances, including the Annual Investment Allowance, on qualifying plant and machinery
• Research and Development tax relief, where eligible innovation or development work is undertaken

These reliefs can significantly reduce taxable profits when used correctly.

Working with professional advisers

The rules around expenses, allowances, and reliefs can be complex. Working closely with an accountant or tax adviser helps ensure:

• Expenses are claimed correctly
• Reliefs are maximised
• HMRC requirements are met

Professional advice can also support wider cash flow and funding decisions, particularly where tax liabilities affect working capital.