What is Tax Deductible
What Is Tax Deductible?
A practical guide to tax-deductible expenses in the UK, including what businesses can claim, what HMRC generally disallows and how allowable expenses reduce taxable profits.
An expense is tax deductible when the tax rules allow it to be deducted when calculating taxable profit. Common examples can include accountancy fees, business insurance, software, advertising, salaries and qualifying business travel.
An allowable expense normally reduces taxable profit. The actual tax saving depends on the applicable tax treatment and tax rate.
What is tax deductible?
A tax-deductible expense is a business cost that can be deducted when calculating taxable profit, provided it meets the relevant tax rules.
For a UK limited company, day-to-day revenue expenses will generally need to be incurred wholly for a business purpose and must not be specifically disallowed. Examples can include accountancy fees, salaries, business insurance, software, advertising, office costs and qualifying business travel.
The important point is that tax deductible does not mean HMRC refunds the whole cost. Instead, an allowable expense normally reduces the profit on which tax is calculated.
When business owners ask “what is tax deductible?”, they are usually trying to establish which costs can legitimately reduce their taxable profits. The answer depends on the type of business, why the cost was incurred and whether specific tax rules restrict the deduction.
What Does Tax Deductible Mean?
If an expense is tax deductible, its allowable amount can generally be deducted when calculating the profit on which your business pays tax.
Simple example
Suppose a business has £80,000 of income and £20,000 of allowable tax-deductible expenses:
Tax is therefore calculated by reference to the taxable profit after relevant deductions and adjustments, rather than simply the £80,000 of income.
The Main Rule: Is It Really a Business Expense?
A central principle in deciding whether business expenditure is deductible is its business purpose. For trading expenses, you will often hear this described as the “wholly and exclusively” rule.
In simple terms, ask: why was this cost incurred? If it was genuinely incurred for the purposes of the business, a deduction may be available. If the expenditure is personal, or specifically prohibited by tax legislation, it may not be deductible.
Business purpose
The expenditure should have a genuine business purpose.
Not disallowed
Some genuine business costs are specifically disallowed for tax, such as most client entertaining.
Correct treatment
Capital purchases may receive capital allowances rather than being treated as ordinary revenue expenses.
What Expenses Are Tax Deductible?
The exact treatment depends on the circumstances, but the following are common examples of costs that may be deductible for a UK business.
| Expense | Usually deductible? | Key point |
|---|---|---|
| Accountancy fees | ✓ Usually | Where they relate to the business and its accounts/tax affairs. |
| Business insurance | ✓ Usually | For example professional indemnity or public liability insurance. |
| Advertising & marketing | ✓ Usually | Includes many website, advertising and promotional costs. |
| Software | ✓ Usually | Business subscriptions and qualifying software costs. |
| Employee salaries | ✓ Usually | Subject to the normal employment and business-purpose rules. |
| Employer pension contributions | ✓ Often | Subject to the relevant tax rules and circumstances. |
| Business travel | ✓ Usually | Must qualify as business travel rather than ordinary commuting. |
| Office rent & utilities | ✓ Usually | To the extent they relate to the business. |
| Telephone & internet | ✓ Usually | Business element must be identified where appropriate. |
| Professional subscriptions | ✓ Often | Depends on the organisation, business relevance and applicable rules. |
| Business loan interest | ✓ Often | Subject to the rules governing finance costs and how the borrowing is used. |
| Client entertaining | ✕ Generally no | Usually disallowed when calculating taxable business profit. |
| Personal expenses | ✕ No | Private expenditure is not a business tax deduction. |
What Is Tax Deductible for a Limited Company?
A limited company is legally separate from its directors and shareholders. This distinction is important when deciding whether an expense belongs to the company or to you personally.
Revenue expenses incurred wholly for a business purpose can generally be deducted from company income when calculating taxable profit, provided the expense is not specifically disallowed.
Some costs require different treatment. A computer, vehicle, machine or other long-term asset, for example, may be a capital expense rather than an ordinary revenue expense.
Need help with your company's accounts? See our limited company accounts filing service.
What Is Not Tax Deductible?
Not every cost paid by a business is deductible for tax. Some expenditure is private, some is capital in nature and some is specifically disallowed by tax legislation.
| Cost | Typical treatment | Why? |
|---|---|---|
| Client entertaining | Generally disallowed | Business entertaining is normally specifically disallowed for tax. |
| Personal groceries | Not deductible | Personal rather than business expenditure. |
| Normal everyday clothing | Generally not deductible | Ordinary clothing has a personal purpose even if worn for work. |
| Fines for breaking the law | Generally not deductible | Tax relief is not normally available for penalties imposed for breaking the law. |
| Ordinary commuting | Generally not deductible | Home-to-permanent-workplace travel is normally private commuting. |
| Depreciation | Not itself a tax deduction | Capital allowances may instead be available on qualifying expenditure. |
What About Expenses That Are Part Business and Part Personal?
Some expenditure has both a business and private element. In appropriate circumstances, where the business element can be clearly identified and separated, the allowable business proportion may be deductible.
Example: business and private use
Suppose a cost is £100 and an identifiable £70 relates to qualifying business use while £30 relates to private use. Depending on the type of expenditure and applicable rules, the £70 business element may be deductible while the £30 private element is not.
The ability to apportion expenditure depends on the nature of the cost. You should not assume that every expense with some business use can automatically be split.
Capital Expenses vs Revenue Expenses
One of the most important distinctions in business tax is between revenue expenditure and capital expenditure.
| Revenue expense | Capital expense | |
|---|---|---|
| Purpose | Day-to-day running of the business | Buying or improving longer-term business assets |
| Examples | Rent, wages, stationery, many subscriptions | Machinery, equipment, certain vehicles |
| Tax treatment | Often deducted in calculating taxable trading profit | May qualify for capital allowances or other specific relief |
| Depreciation | Not relevant to most revenue expenses | Accounting depreciation is generally replaced by the appropriate tax treatment |
Are Business Mileage Costs Tax Deductible?
Business mileage can qualify for tax relief, but the rules depend on whether you use your own vehicle, a company vehicle and whether you are an employee/director or self-employed.
These rates relate to qualifying business mileage. Normal private travel and ordinary commuting do not become deductible merely because a vehicle is also used for business.
Is Working From Home Tax Deductible?
Certain additional costs associated with working from home can qualify, but the rules differ significantly between a sole trader and an employee/director of a limited company.
A self-employed person may be able to claim an appropriate proportion of qualifying household costs or, where eligible, use HMRC's simplified expenses. Limited company directors fall within employment rules, so the treatment is different.
What Is Tax Deductible if You Are Self-Employed?
Sole traders can deduct allowable business expenses when calculating taxable trading profit for Income Tax purposes.
Common categories include:
Sole traders and qualifying partnerships can also use simplified expenses for certain costs, including eligible vehicle expenses and working from home. Limited companies cannot use the self-employed simplified expenses regime.
If you are self-employed, see our self-employed accounts service and our Self Assessment tax return service.
Tax-Deductible Expenses: Practical Examples
| Situation | Likely position |
|---|---|
| You pay an accountant to prepare your company's annual accounts. | Usually deductible as a normal business administration cost. |
| You buy lunch for a prospective client. | Generally not deductible for Corporation Tax because client entertaining is normally disallowed. |
| You buy a software subscription used solely by the business. | Usually deductible, subject to the nature of the software arrangement. |
| You buy ordinary clothes to look professional at meetings. | Generally not deductible because ordinary clothing has an inherent private purpose. |
| You pay for professional indemnity insurance. | Usually deductible where required for or relevant to the business. |
| You purchase machinery for long-term use. | Usually capital expenditure; capital allowances may be available instead of an ordinary revenue deduction. |
Are Staff Gifts and Parties Tax Deductible?
Staff entertaining and employee benefits have their own rules and should not be confused with client entertaining.
An annual staff function can qualify for a tax exemption for employees where the relevant conditions are satisfied and the total cost does not exceed £150 per head. The £150 figure is an exemption threshold, not a simple allowance.
Certain employee benefits costing £50 or less can also fall within the trivial benefits exemption if all the conditions are met. For directors of close companies, a separate annual cap can apply.
What Records Should You Keep for Tax-Deductible Expenses?
Good records help demonstrate what was purchased, how much was paid and why the expense relates to the business.
Limited companies generally need to retain accounting records for six years from the end of the last company financial year they relate to, and sometimes longer in particular circumstances.
How Do I Know if Something Is Tax Deductible?
Before treating a cost as deductible, work through these questions:
Frequently Asked Questions About Tax-Deductible Expenses
What does tax deductible mean in simple terms?
It means an allowable amount can be deducted when calculating taxable profit. It does not normally mean you receive the entire cost back from HMRC.
What expenses are tax deductible for a limited company?
Common examples include qualifying accountancy fees, salaries, business insurance, advertising, office costs, software and business travel. Each expense must be considered under the relevant tax rules.
Are accountant fees tax deductible?
Accountancy fees relating to the business, such as preparing company accounts, are generally deductible. Personal services provided to a director or shareholder may need to be treated differently.
Are business lunches tax deductible?
Meals that amount to client or prospective-client entertaining are generally not deductible for Corporation Tax. Qualifying subsistence incurred as part of genuine business travel can be treated differently.
Are business clothes tax deductible?
Ordinary clothing is generally not deductible simply because you wear it for work. Uniforms, protective clothing and certain specialist clothing can be treated differently.
Is a laptop tax deductible?
A laptop bought for business use may qualify for tax relief. The precise treatment depends on factors including the business structure, ownership, business use and whether the expenditure is treated as capital.
Can I claim expenses paid from my personal bank account?
Paying a genuine business expense personally does not necessarily prevent relief. For a limited company, the transaction should be properly recorded, normally through the director's loan account or reimbursement process.
Can I claim expenses that have both business and private use?
Sometimes. Where an identifiable business element can legitimately be separated from private use, an appropriate deduction may be possible. Some types of expenditure cannot be apportioned in this way, so the specific rules matter.
Is VAT the same as a tax deduction?
No. VAT recovery and deductions when calculating taxable profits are separate tax questions. An expense can have different treatment for VAT and Corporation Tax or Income Tax purposes.
Does claiming a £1,000 expense save £1,000 in tax?
No. A deductible £1,000 expense generally reduces taxable profit by £1,000. The actual tax effect depends on the applicable tax rate and the circumstances of the business.
We are ACCA qualified accountants providing accounts and tax services to limited companies, sole traders, partnerships and individuals throughout the UK. Tax treatment depends on individual circumstances, so obtain advice where you are unsure whether an expense qualifies.
Not Sure What Your Business Can Claim?
Correctly identifying allowable expenses can reduce taxable profits while keeping your accounts compliant. Our UK online accountants can help you identify the correct tax treatment and prepare your year-end accounts.