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August 11, 2026
Does a Uk Limited Company Pay Corporation Tax on All Income?
If you run a UK limited company, you may assume that Corporation Tax is charged on every pound the company receives. However, Corporation Tax is generally not calculated simply on the company's total income or turnover.
Instead, a UK limited company normally pays Corporation Tax on its taxable profits.
This distinction is important. Your company could receive £100,000 in sales during the year, but that does not necessarily mean it pays Corporation Tax on the full £100,000.
Allowable business expenses, certain reliefs and other tax adjustments can affect the amount of profit ultimately subject to Corporation Tax.
This guide explains what types of company income can be taxable, what can be deducted and how Corporation Tax is generally calculated for a UK limited company.
No. Corporation Tax is not normally charged directly on turnover.
Turnover is broadly the income generated from the company's ordinary business activities before expenses are deducted.
Profit is what remains after relevant costs and expenses have been taken into account, subject to Corporation Tax rules and adjustments.
For example, imagine a company has:
Sales income: £100,000
Allowable business costs: £60,000
Profit before other tax adjustments: £40,000
Corporation Tax would not normally be calculated on the £100,000 of sales. The starting point would instead be the company's profits, with further adjustments made where required under the Corporation Tax rules.
Corporation Tax can apply to more than just profits generated from selling products or services.
According to HMRC, taxable profits can include money the company makes from:
This means company owners should consider all relevant sources of company income when preparing the Corporation Tax calculation.
Sales revenue contributes towards the company's taxable profit, but Corporation Tax is not generally charged on the gross amount of every sale.
The company can normally deduct qualifying business expenses when calculating its profits.
For example, an online retailer might generate £250,000 in annual sales but incur significant costs for stock, fulfilment, software, advertising, professional services and other business expenses.
The company's taxable profit could therefore be substantially lower than its turnover.
Many legitimate business costs can be deducted when calculating company profits, provided they satisfy the relevant Corporation Tax rules.
Depending on the business, expenses could include:
However, not every payment made from the company's bank account is automatically deductible for Corporation Tax.
Some expenses may be disallowed, restricted or treated differently for tax purposes.
One of the important principles when considering business expenses is whether the expense was incurred wholly and exclusively for the purposes of the trade.
Personal expenses are generally not deductible simply because they were paid through the company's bank account.
Where an expense has both business and personal elements, the tax treatment can depend on whether the business element can be separately identified and on the specific rules applying to that expense.
Good bookkeeping is therefore important when calculating Corporation Tax.
Potentially, yes.
Corporation Tax can apply to certain investment profits and income received by a company.
The precise tax treatment depends on the type of investment and income involved.
For example, interest earned by a company may need to be included in its Corporation Tax calculation.
Dividends received by UK companies can be subject to different rules and are often exempt from Corporation Tax, although exceptions and specific conditions can apply.
Companies with significant investment activity should consider obtaining professional tax advice.
It may.
If a UK company disposes of an asset and makes a taxable gain, the gain may be subject to Corporation Tax.
For companies, these are generally referred to as chargeable gains and are included within the Corporation Tax system rather than being subject to Capital Gains Tax in the same way as gains made by individuals.
Assets could potentially include:
The taxable gain is not necessarily the entire amount received from selling the asset.
The calculation generally considers the acquisition cost and other qualifying amounts under the relevant tax rules.
Not every amount entering the company's bank account is taxable income.
For example, money introduced into the company by a shareholder or director as a genuine loan would not normally be treated as sales income simply because it has been deposited into the company's bank account.
Similarly, issuing shares to investors in exchange for capital is different from earning trading income.
This is why businesses should not calculate Corporation Tax simply by adding together every incoming bank transaction.
Transactions need to be correctly categorised in the company's accounting records.
Receiving a genuine business loan does not normally represent company profit.
If a company borrows £50,000, for example, it has received £50,000 in cash but also has an obligation to repay that money.
The loan itself is therefore different from £50,000 earned through trading.
However, interest and other costs associated with borrowing can have their own Corporation Tax treatment.
If a company is VAT registered, VAT collected from customers is generally not treated in the same way as the company's sales income for Corporation Tax purposes.
The company collects VAT and accounts for it to HMRC under the VAT system, subject to deductions for eligible input VAT.
VAT and Corporation Tax are separate taxes and should be accounted for correctly.
The accounting treatment can also depend on whether figures in the company's accounts are recorded net or gross of VAT.
The treatment of dividends received by a UK company is more specialised.
Many dividends received by UK companies fall within Corporation Tax exemptions, although the rules contain different categories, conditions and exceptions.
Therefore, company owners should not automatically assume either that every dividend received is taxable or that every dividend is exempt.
Where a company holds investments or receives significant dividend income, professional advice may be appropriate.
Dividends paid by the company to its shareholders are not normally deductible as a business expense when calculating Corporation Tax profits.
This is an important distinction.
Corporation Tax is calculated on the company's taxable profits. Dividends are generally distributions made from profits available for distribution after considering the company's financial position.
A company therefore cannot normally reduce its Corporation Tax bill simply by paying its profits to shareholders as dividends.
If a company has no taxable profit, it may have no Corporation Tax to pay for that accounting period.
Trading losses may also be capable of being used against certain profits, carried forward or, in some circumstances, carried back, subject to the relevant Corporation Tax loss-relief rules.
The rules can become complex, particularly where a company has multiple trades or significant losses.
Keeping accurate records of company losses can therefore be important even when no Corporation Tax is currently payable.
Consider a UK limited company with the following simplified figures:
Annual sales: £150,000
The company also has qualifying business costs such as stock, advertising, software, insurance, salaries and professional fees totalling £90,000.
That leaves:
Accounting profit before further tax adjustments: £60,000
Corporation Tax is not simply charged on the £150,000 turnover.
The company's taxable profit must first be calculated according to Corporation Tax rules. Certain accounting expenses may need to be added back, while tax allowances, reliefs or other adjustments may also apply.
The final taxable profit is then used to calculate the Corporation Tax liability at the applicable rate.
Understanding these three terms makes Corporation Tax much easier to understand.
The company's income from its ordinary business activities before expenses.
Broadly, the amount remaining after accounting income and expenses have been recorded.
The amount calculated after making the adjustments required under Corporation Tax rules.
It is the taxable profit, rather than simply turnover, that is particularly important when calculating Corporation Tax.
No.
Just because the company pays for something does not automatically mean the expense reduces its Corporation Tax liability.
Certain expenses can be disallowed or subject to special rules.
Examples can include:
Capital expenditure may instead qualify for capital allowances or another form of tax relief depending on the asset and circumstances.
Good bookkeeping is essential for calculating Corporation Tax correctly.
Your company's accounting records should clearly distinguish between:
Incorrectly categorising money received by the company can result in taxable profits being overstated or understated.
Maintaining accurate records throughout the year can also make preparing the company's annual accounts and Company Tax Return considerably easier.
Not necessarily. Corporation Tax is generally calculated on taxable company profits rather than simply every pound received by the company.
No. Turnover and taxable profit are different. Qualifying expenses and relevant tax adjustments are taken into account when calculating taxable profits.
A genuine business loan is not normally trading income simply because the money enters the company's bank account.
Genuine share capital introduced into a company is generally different from trading income and should be accounted for accordingly.
Qualifying business expenses can reduce the profits on which Corporation Tax is calculated. However, not every company expense is deductible.
Generally, no. Dividends paid to shareholders are distributions rather than deductible trading expenses.
If the company has no taxable profits after the relevant calculations, it may have no Corporation Tax liability for that period. Loss-relief rules may also be relevant.
A UK limited company does not simply pay Corporation Tax on every pound of income entering its bank account.
Corporation Tax is generally calculated on the company's taxable profits.
Trading profits, certain investment income and chargeable gains can contribute towards taxable profits, while qualifying business expenses, allowances, losses and reliefs may reduce the amount subject to Corporation Tax.
This is why two companies with exactly the same annual turnover could have very different Corporation Tax liabilities.
The key is to maintain accurate accounting records, correctly categorise company income and expenditure and calculate taxable profits according to UK Corporation Tax rules.
For the latest rules and guidance, always check HMRC and GOV.UK or seek advice from a qualified accountant or tax adviser.
This article provides general information about Corporation Tax for UK limited companies and does not constitute tax, accounting or legal advice.
