Published: June 2026 | Fact-Checked & Audited By: David Vance, CTA FCA (Chartered Tax Advisor & Accountant)
This guide is fully updated for the 2026/27 HMRC tax year. All calculations and tax rules have been audited against official UK legislation.
The most direct and effective way to reduce your Limited Company’s Corporation Tax liability is by claiming all legitimate, allowable business expenses. HMRC rules state that expenses must be incurred **”wholly and exclusively”** for the purpose of trade. Claiming these costs correctly lowers your net taxable profits, meaning you only pay tax on what your business actually keeps. In this guide, we review the main categories of allowable expenses, explain the rules for capital allowances, and show you how to claim them in the 2026/27 tax year.
What Expenses Can a UK Ltd Company Claim?
HMRC allows companies to claim a wide range of operational costs. The most common allowable business expenses include:
- Salaries and National Insurance: Salaries paid to directors and staff, plus employer National Insurance Contributions (NICs).
- Office and Travel Costs: Office rent, utility bills, business phone lines, travel fares, and hotel accommodation for business trips.
- Professional Fees: Accountancy fees, legal costs directly related to trade, and professional indemnity insurance.
- Equipment and Software: Laptops, office furniture, software licenses, and web hosting required to run your business.
- Pension Contributions: Employer contributions paid directly into a director’s or employee’s registered pension scheme.
Using Capital Allowances to Deduct Assets
If you purchase long-term physical assets for your business (such as machinery, company vans, or commercial equipment), you cannot deduct the cost as a standard day-to-day expense. Instead, you must claim **Capital Allowances**. For the 2026/27 tax year, companies can utilize the **Annual Investment Allowance (AIA)** to claim 100% of the cost of qualifying plant and machinery up to £1 million in the first year. To estimate your first-year tax savings, use our Capital Allowances Calculator.
The Power of Employer Pension Contributions
Paying money directly from your company into your pension is one of the most efficient tax planning tools available. These contributions are treated as an allowable business expense, reducing your Corporation Tax by up to 25% while building your personal retirement pot without triggering National Insurance. To model how these savings impact your overall company tax, use our Small Business Tax Planner or check your limits with our Pension Carry Forward Calculator.
Frequently Asked Questions: Business Expenses
Q: What does “wholly and exclusively” mean for HMRC expenses?
A: “Wholly and exclusively” means the expense must be incurred solely for business purposes. If an expense has a dual purpose (such as purchasing a laptop for both company work and personal gaming), you can only claim the proportion that is directly business-related.
Q: Can I claim my home office rent as a business expense?
A: Yes, you can claim home office costs either as a flat statutory rate (£6 per week for 2026/27) or by calculating a proportion of your actual home bills based on the rooms and hours used. If you choose the latter, you should draw up a formal rental agreement between yourself and your company.
Q: Are entertainment expenses allowable for Corporation Tax?
A: No, client entertainment is not an allowable expense for Corporation Tax, meaning it must be paid out of post-tax profits. However, you can claim staff entertainment (such as an annual Christmas party) up to £150 per head tax-free.