UK Contractor Expenses: What Can You Claim in 2026?

The Golden Rule: Wholly and Exclusively for Business

Every allowable expense claim rests on a single test that HMRC applies: was the expenditure incurred wholly and exclusively for the purposes of the business? This principle, drawn from the Corporation Tax Act 2009 for limited companies (and the Income Tax Act 2007 for sole traders), governs every expense claim you make.

In practice, this means three things. First, the expense must have been genuinely incurred — you cannot claim for notional costs or costs you expect to incur. Second, the purpose must be business-related: if there is any private benefit, the personal element may need to be excluded. Third, the expense should be justifiable in the context of your business. A contractor charging thousands in personal restaurant meals as "client entertainment" will not survive an HMRC enquiry.

Limited company contractors have an additional advantage: expenses paid through the company are deducted before corporation tax is calculated, meaning the tax relief is at the corporation tax rate (19% for small profits) rather than your marginal income tax rate. Over a year, a well-managed expenses position can meaningfully reduce your overall tax bill. That makes understanding what you can claim — and maintaining the evidence to support it — one of the highest-value activities for any contractor.

Home Office Expenses

Most contractors work from home for at least part of their time, and HMRC allows you to claim a proportion of your home running costs as a business expense. There are two approved methods for limited companies:

Method 1: HMRC Flat Rate (Simplified Expenses)

HMRC permits a flat rate deduction based on the number of hours per month you work from home. For 25 to 50 hours per month, the rate is £10/month. For 51 to 100 hours, it is £18/month. For more than 100 hours, it is £26/month. This requires no calculation or record-keeping beyond tracking hours, which makes it simple — but the amounts are modest.

Method 2: Proportional Calculation

The more generous approach is to calculate the business proportion of your actual home running costs. You take the total of allowable home costs — mortgage interest or rent, utilities (gas, electricity, water), council tax, broadband, and buildings insurance — and divide by the number of rooms in your property. The room(s) used for work, multiplied by the proportion of time used for business purposes, gives the claimable amount. For a contractor who uses a dedicated home office for a significant proportion of their working week, this method routinely produces a much higher deduction than the flat rate.

One caution: if you designate a room exclusively as a business office, there may be partial capital gains tax implications if you sell your home. Most contractors use a room that doubles as personal space — a spare bedroom used as an office, for example — which avoids this issue while still supporting a reasonable proportional claim.

Equipment and Technology

Computers, monitors, keyboards, peripherals, specialist software, and other technology used for your contracting work are allowable business expenses. For limited companies, equipment purchases may be claimed either as a revenue expense (if the item is low-value or consumable) or as a capital allowance (if it is a longer-lived asset).

Under the Annual Investment Allowance (AIA), businesses can deduct the full cost of qualifying plant and machinery — including computers and equipment — up to £1 million per year. In practice, most contractors' equipment costs fall well within this limit, meaning you get 100% relief in the year of purchase rather than spreading the deduction over several years.

Key points to note:

• Dual-use equipment: If you purchase a laptop that you use for both business and personal purposes, strictly only the business proportion is allowable. In practice, where the primary use is business, most accountants treat the full cost as a business expense. Keep a record of how the equipment is used.
• Mobile phones: One mobile phone per employee (including a director of your own company) is an allowable tax-free benefit. If the phone is provided by the company and used partly personally, HMRC typically allows the full cost provided it is not excessive.
• Subscription software: Monthly or annual software subscriptions — development tools, design applications, project management software, cloud storage — are fully allowable business expenses in the year paid.
• Monitors and peripherals: Additional monitors, keyboards, mice, docking stations, webcams, and headsets used primarily for work are allowable.

Travel and Subsistence: The 24-Month Rule Explained

Travel expenses are one of the most valuable — and most frequently misunderstood — contractor expense categories. The key concept is the 24-month rule, which determines whether a workplace is a "temporary workplace" (allowing travel cost deductions) or a "permanent workplace" (which does not).

A client site qualifies as a temporary workplace if you do not spend, or expect to spend, more than 40% of your working time there for more than 24 months. If you do — or once it becomes apparent that you will — the site becomes a permanent workplace, and travel costs to and from that site cease to be allowable.

What this means in practice:

• If you start a new contract at a client site with no expectation that it will last more than 24 months, travel costs are allowable from day one.
• If the contract is extended and you realise it will exceed 24 months at 40%+ of your time, travel ceases to be allowable from the point that expectation arises — not from the 24-month mark itself.
• Contractors on multiple short contracts at different client sites can typically claim travel throughout, as each engagement is a discrete temporary workplace.

Allowable travel costs include: train, tube, bus, and coach fares; mileage at HMRC's approved rates (45p per mile for the first 10,000 miles, 25p thereafter for cars); parking fees at temporary workplaces; and taxis for business travel.

Subsistence — meals and drinks while travelling for business — is allowable at reasonable levels when you are away from your normal place of work. HMRC does not publish a fixed meal allowance, but reasonable amounts (a working lunch while travelling) are generally accepted. Retain receipts for all subsistence claims.

Professional Development and Training

Training and professional development costs are allowable where the training is directly related to your current business activities — skills you need to carry out your existing contracting work. A software developer studying a new programming language relevant to their projects, or a project manager completing a certification relevant to their discipline, can claim the full cost.

Where training is designed to allow you to enter a new field entirely, HMRC may not allow the deduction — the "wholly and exclusively" test is harder to satisfy if the training is primarily about career change rather than maintaining or improving skills in your existing specialty. In borderline cases, take advice from your accountant.

Allowable training expenses include: course fees, examination fees, study materials, relevant books and publications, and online learning subscriptions directly relevant to your field.

Professional Subscriptions and Memberships

Annual subscriptions to professional bodies — provided those bodies appear on HMRC's approved list of professional organisations — are allowable expenses. For most contractors, this covers subscriptions to industry bodies such as BCS (Chartered Institute for IT), CIOB, CIPS, PMI, RICS, and many others.

Memberships to networking organisations, trade associations, and professional forums directly relevant to your contracting work are also generally allowable. Personal club memberships — gym memberships, golf clubs, social clubs — are not allowable, even if you occasionally discuss business at those venues.

Accountancy and Legal Fees

The costs of running your business professionally are fully allowable. This includes:

• Accountancy fees — your accountant's fees for bookkeeping, company accounts preparation, corporation tax returns, and payroll are allowable in full. If your accountant charges for personal tax return preparation, the proportion relating to your personal income (salary and dividends) may need to be treated differently — ask your accountant how they split the invoice.
• Legal fees — contract review fees, legal advice relating to your business, and costs of resolving commercial disputes are allowable. Legal costs relating to personal matters are not.
• IR35 contract review fees — the cost of having your contract reviewed by an IR35 specialist is a legitimate business expense, fully allowable against corporation tax.
• Bookkeeping software — subscriptions to accounting software such as FreeAgent, Xero, or QuickBooks are allowable.

Insurance

Business insurance premiums are allowable expenses. The main policies relevant to contractors are:

• Professional Indemnity (PI) Insurance: Covers you if a client claims your work caused them financial loss. Many clients require contractors to hold a minimum PI limit. Fully allowable.
• Public Liability Insurance: Covers injury or property damage to third parties. Less commonly required for office-based contractors but may be specified in client contracts. Fully allowable.
• Employer's Liability Insurance: Legally required if your company employs anyone other than yourself (including a spouse or partner). Fully allowable.
• IR35 Investigation Cover: Specialist insurance that covers the cost of defending a HMRC IR35 investigation — legal fees, tax adviser costs, and (in some policies) any additional tax, interest, and penalties found due. Annual premiums range from around £150 to £400 depending on level of cover. Fully allowable. Given the potential cost of an IR35 investigation (HMRC can go back six years), this is widely considered one of the most cost-effective protections available to contractors.
• Relevant Life Insurance: A company-paid life insurance policy that pays out to your family if you die. Premiums are a corporation tax deduction for the company and are not treated as a personal benefit in kind — unlike a personal life insurance policy paid personally. This makes it a tax-efficient way for a limited company director to provide life cover.

Marketing and Website Costs

If you have a professional website for your contracting business, the costs of building and maintaining it are fully allowable: domain registration, hosting fees, web design, and content creation. The same applies to any advertising or marketing spend — LinkedIn Premium used for business development, paid job board listings, or professional profile services.

Business cards, stationery, and professional materials branded with your company details are allowable. Keep records showing these relate to your business rather than personal use.

Pension Contributions as a Company Expense

One of the most tax-efficient mechanisms available to limited company contractors is employer pension contributions. When your company pays directly into your pension as an employer contribution (rather than you paying personally as an employee), the contribution is:

• Deductible against corporation tax — reducing your company's taxable profits at 19%
• Not subject to income tax or National Insurance in your hands — unlike salary
• Not subject to dividend tax — unlike dividend income

This makes employer pension contributions one of the single most tax-efficient ways to extract value from your limited company. The annual pension contribution allowance for 2026/27 is £60,000 (gross), subject to relevant UK earnings. Contributions above this — or above your annual earnings — may trigger a tax charge.

To set this up, your company makes a direct payment into a pension scheme (SIPP, workplace pension, or personal pension that accepts employer contributions) and records it as an employer pension contribution on the company accounts. Your accountant can advise on the mechanics and ensure the contribution is structured correctly.

What You Cannot Claim

It is equally important to understand the expenses that are not allowable. Claiming non-allowable expenses exposes you to HMRC investigation and potential penalties.

• Commuting costs: Travel from your home to a permanent workplace — a client site that has become, or always was, your permanent base — is not allowable. This is personal commuting, not business travel, regardless of the distance involved.
• Personal clothing: Ordinary clothing you could wear outside work — even suits or smart attire worn specifically for client meetings — is not allowable. The exception is specialist protective clothing or uniforms required for the work (PPE, branded workwear) that would not be worn outside of work.
• Personal entertaining: Client entertainment that has a significant social element is not deductible. HMRC specifically disallows "entertaining" as a deduction. Business meals with clients are only partially recoverable for VAT purposes, and are generally not corporation tax deductible.
• Personal phone contract: If a phone contract is held personally — not by the company — the costs are personal, not business, even if you use the phone extensively for work. One company-held phone is allowable; personal contracts are not.
• Fines and penalties: Any fines — parking tickets, late filing penalties, or other regulatory penalties — are not allowable under HMRC rules. These are disallowed regardless of the circumstances.
• Dividends: Dividends paid to shareholders are distributions of profit, not expenses. They do not reduce your corporation tax liability and should never be recorded as an expense in your company accounts.
• Personal mortgage payments: Unless you are claiming a proportional home office deduction, mortgage capital repayments have no place in your business expenses. Even a proportional home office claim covers only interest (if applicable) and running costs — not capital repayment.

Record Keeping: What HMRC Expects

Claiming expenses is only half the job. HMRC requires you to retain evidence for every claim. For limited companies, records must generally be kept for six years from the end of the accounting period to which they relate. For sole traders, the period is five years and ten months from the tax year end.

What HMRC expects to see:

• Receipts and invoices for every expense claimed — including digital receipts. Photo or scan receipts on the day you incur the expense: paper receipts fade and are easily lost.
• Mileage logs if claiming car mileage — date, destination, business purpose, and miles driven for each journey.
• Bank and credit card statements that corroborate your expense records. HMRC expects your business bank account to be used for business transactions — mixing personal and business finances makes record-keeping significantly harder.
• Contracts and engagement letters that support travel and subsistence claims by evidencing the temporary nature of workplaces.
• Payroll records if you take a salary from your company.
• Pension records confirming employer contribution amounts and dates.

Modern accounting software makes record-keeping much less burdensome than it once was. Apps like Dext (formerly Receipt Bank), integrated with Xero or FreeAgent, allow you to photograph receipts immediately and have them coded and matched to transactions automatically. Setting up this workflow from the start of your company's life is far easier than trying to reconstruct records at year-end.

Allowable vs Not Allowable: Summary Table

Use this table as a quick reference. "Partial" indicates that only the business proportion is allowable, or that conditions apply.