Understanding which costs you can claim is essential for every UK business owner, whether you’re a sole trader, limited company director, or landlord. This comprehensive guide from Tax Return Accountants explains the latest HMRC rules, practical examples, and how to maximise your claim for the 2025/26 and 2026/27 tax years.

Key Takeaways

• Claiming all your allowable expenses reduces your taxable profit and saves money.
• Rules differ for sole traders, limited companies, and landlords—check specifics.
• Home office, mileage, and staff costs are often missed but can add up.
• MTD rules change how you record and report expenses from April 2026.
• Penalties for mistakes can reach £1,600+—get it right first time.

Allowable Expenses: Complete UK Guide

This guide from Tax Return Accountants covers everything you need to know about allowable expenses, so you can stay compliant with confidence.

What Are Allowable Expenses? (Definition & HMRC Rules )

Over 800,000 late filing penalties were issued by HM Revenue & Customs (HMRC) in the 2024/25 tax year for incorrect or missing expense claims.

Allowable expenses are the costs of running your business that HMRC lets you claim to reduce your taxable profits. To qualify, these amounts must be ‘wholly and exclusively’ for business purposes—meaning there’s no personal benefit. For 2025/26 and 2026/27, updated HMRC guidance emphasises digital recordkeeping under Making Tax Digital, and stricter scrutiny on dual-purpose or mixed-use costs.

Sole traders, partnerships, and limited companies all benefit from claiming the right amounts, but the expense categories and reporting methods differ. For instance, software subscriptions, business insurance, and professional fees are usually permitted, but client entertaining and personal costs are not. HMRC’s expense categories are detailed and change each tax year, so it’s vital to check the latest list for tax deductible expenses UK.

Unlike many guides, at Tax Return Accountants we see first-hand that missing even small claims—like home office broadband or allowable training—can cost clients hundreds in unnecessary tax. With Making Tax Digital now mandatory for businesses earning over £50,000 from April 2026, accurate, digital records are no longer optional. If you’re unsure what is claimable, professional advice is essential to avoid penalties and maximise relief.

For a detailed breakdown of expense rules and categories, see HMRC’s guidance at GOV.UK or talk to our Self Assessment Service.

What Expenses Can I Claim as a Sole Trader or Self-Employed? ( Update)

Sole traders can claim a wide range of costs, but not everything is permitted.

• Travel for business meetings, site visits, and deliveries (excluding commuting from home to a regular place of work)
• Materials, stock, and goods bought for resale
• Business insurance, such as public liability or professional indemnity
• Office supplies, phone, and broadband (business portion only)
• Marketing, website, and advertising fees
• Staff wages and subcontractor payments
• Home office costs (either a fixed rate or actual business proportion)
• Professional fees (legal, accountancy, consultancy)
• Bank charges and business loan interest
• Training courses directly related to your business

However, personal costs, client entertainment, fines, and most dual-purpose expenses are always disallowed. For 2025/26 and 2026/27, simplified expenses let you use HMRC’s fixed rates for mileage (see below) and home working if you meet the criteria.

Here’s a reference table showing what’s permitted and what isn’t for self employed allowable costs:

What most guides fail to mention: Many sole traders miss out on claiming a fair share of their home broadband, mobile phone, or even personal laptop if used for business. You must only claim the business proportion, but HMRC accepts reasonable estimates if records are kept.

In 2025/26, a Leicester-based ecommerce sole trader approached us after only claiming postage and stock costs. By reviewing all their outgoings, we identified an additional £2,750 in legitimate costs—broadband, home office, and digital marketing—reducing their tax by £550 (22% rate). This outcome is rarely achieved without professional input.

For more on digital recordkeeping and expense tracking, see our Bookkeeping Service.

Limited Company Expenses List: What’s Tax Deductible in 2026/27?

What can limited companies claim, and how is it different from sole traders?

Directors and employees can claim for costs incurred ‘wholly and exclusively’ for company purposes, but personal items—even if paid from a company card—are never permitted. Capital items, such as computers or company vehicles, are not deducted as running costs but via capital allowances. For 2026/27, the main Corporation Tax rate is 25% for profits over £250,000 and 19% for profits under £50,000. This makes every pound of expense worth up to 25p in tax saved.

For detailed advice on Corporation Tax and capital allowances, visit our Corporation Tax Service or HMRC’s guidance at GOV.UK.

Landlord Allowable Expenses UK: What Can You Claim in ?

Imagine a Nottingham landlord managing two rental properties, uncertain about which costs are legitimate. They want to know if they can claim letting agent fees, repairs, mortgage interest, or home office costs for managing their portfolio.

• Repairs and maintenance (not improvements)
• Letting agent and management fees
• Landlord insurance premiums
• Service charges and ground rent
• Utilities and council tax (if paid by landlord)
• Accountancy and legal fees (for property business)
• Home office costs (if used for admin, not personal use)
• Mortgage interest (restricted relief—basic rate only, per 2026 rules)
• Advertising for tenants
• Travel to and from rental properties (not commuting)

Landlords cannot claim capital improvements (e.g., extensions, new bathrooms), personal costs, or fines. From 2026, digital reporting under Making Tax Digital will be required for landlords with property income over £50,000, and for those over £30,000 from 2027. This means every claim must be backed by digital evidence.

For more guidance, see our Landlord Accountants service or HMRC’s property guidance at GOV.UK.

Business Mileage Allowance and Vehicle Expenses: What Counts?

HMRC’s approved rate for business mileage is 45p per mile for the first 10,000 miles per tax year, dropping to 25p thereafter (2025/26 and 2026/27).

Claiming business mileage allowance UK is one of the most effective ways for sole traders and contractors to recover real costs. To use HMRC’s mileage rates, the vehicle must be personally owned—not company owned—and used for business journeys only (not commuting).

Here’s what’s included in the mileage rate:

• Fuel
• Wear and tear
• Insurance (business portion)
• Servicing and repairs

For contractors, the rules are stricter. If you’re caught by IR35, you cannot claim travel between home and your client’s site as a business journey. Instead, only temporary workplaces or multi-client travel are valid. Companies must keep a detailed logbook or use digital apps to record each journey—HMRC may request evidence up to 6 years later.

For more on claiming vehicle costs as a freelancer or contractor, visit our Freelance Accountants service or HMRC’s travel guidance at GOV.UK.

Small Business Tax Relief & Common Self-Employed Mistakes

Most small businesses miss out on at least one major relief or expense each year.

The main tax reliefs for 2025/26 and 2026/27 include the Annual Investment Allowance (AIA)—allowing up to £1 million of equipment purchases to be offset against profits—Employment Allowance, and R&D relief for innovative businesses. Yet, many self-employed owners overlook home office costs, business use of personal assets (e.g., mobile phones), and training expenses. These missed claims can cost hundreds in extra tax, especially as HMRC increases digital audits under Making Tax Digital.

Penalties for incorrect or false claims are severe: £100 fixed penalty for late returns, £10/day fines after 3 months, and up to 5% of tax due if errors persist. In 2025, a Birmingham-based design consultant working from home missed out on £1,200 of valid home working costs, resulting in £240 extra tax paid—plus a £100 penalty for late correction.

For more on fees and value, see our Accountant Pricing page.

Industry-Specific Allowable Expenses: Contractors, Landlords, and More

Which rules apply to your sector? Let’s break it down.

• Contractors: IR35 restricts what’s permitted—travel to client sites often excluded if you’re inside IR35.
• Freelancers: Claim software, digital subscriptions, and workspace costs.
• Landlords: Service charges, repairs, and letting agent fees—capital improvements not allowed.
• Ecommerce: Packaging, platform fees, advertising, and home office costs.
• Construction: PPE, tool hire, CIS deductions, and travel to sites.
• Healthcare: Professional memberships, indemnity insurance, and specialist equipment.
• Taxi drivers: Fuel, licensing, insurance, and vehicle maintenance.

Below is a table comparing typical allowable costs by industry:

Most people think IR35 only affects how contractors are taxed. Actually, it also limits which costs you can claim—ignoring this can lead to rejected claims and extra tax of £1,000+ per year. For more on sector-specific advice, see our Limited Company Accountants service or HMRC’s IR35 guidance at GOV.UK.

Choosing an Accountant for Allowable Expenses: Selection, Trust & Local Experts

Imagine a Manchester business owner searching for an accountant near me to review their expense claims. They want to know if online or local advisers are better, how to check qualifications, and what the real risks are of DIY vs professional help.

Whether you choose a local accountant or an online service, always verify credentials. Use the table below to check key trust signals:

DIY software costs as little as £0-£50/year, but takes 8-20 hours and carries a high risk of missing claims or making errors. Professional accountants charge £150-£800+ depending on complexity, but typically save more in tax than their fee. In our experience, switching from DIY to professional advice saved a London-based consultant £1,100 in tax and penalties in just one year.

For fee ranges and service details, visit our Accountant Pricing page or HMRC’s directory at GOV.UK.

How to Find an Accountant Near You

Finding a trusted accountant near me is crucial for getting the right advice on expense claims and staying up to date with local business rules. Tax Return Accountants serves clients in Leicester, London, Birmingham, Manchester, Nottingham, and across the East Midlands. As a local accountant UK, we combine city-specific expertise with nationwide coverage.

In Leicester, we help small businesses and landlords navigate HMRC expense categories and digital reporting. London clients benefit from our experience with complex company structures and international transactions. Birmingham and Manchester business owners rely on us for advice on business mileage allowance UK, payroll, and local tax reliefs. Nottingham and the wider East Midlands value our hands-on support and fixed fees from £7.50/month.

Our office: Tax Return Accountants, 77 Nottingham Road, Loughborough, Leicestershire, LE11 1ES. Call 0116 4030595 to book a free consultation or visit our Google Business Profile for reviews and directions.

For more on choosing a chartered accountant near me, see our Accountant Pricing page.

5-Step Accountant Selection Process

1. Identify your needs: Are you a sole trader, landlord, or company director?
2. Shortlist 3 accountants: Compare local and online options for expertise and service fit.
3. Verify regulation: Check ICAEW, ACCA, or AAT registration and HMRC agent status.
4. Compare pricing: Ask for fixed fees and what’s included—avoid hidden costs.
5. Book consultation: Discuss your needs and check communication style before committing.

How to Verify an Accountant

Questions Your Accountant Should Ask You

• Are you VAT registered?
• Do you employ staff?
• Do you receive dividends?
• Do you own rental property?
• Do you expect income growth?

When to Change Accountant: 5 Warning Signs

• Slow communication
• Filing errors
• Missed deadlines
• Lack of tax planning
• No MTD support

Allowable vs Disallowable Expenses

Software Comparison: Xero vs QuickBooks vs FreeAgent vs Sage

Choosing the right software makes digital recordkeeping for MTD much easier. Here’s how the main options compare:

All four are MTD compliant and suitable for most UK businesses.

UK Accountancy Statistics

• 93,000+ ICAEW, ACCA, CIMA, and AAT accountants in the UK (ICAEW).
• 1.5 million+ businesses enrolled in Making Tax Digital (HMRC, 2026).
• 800,000+ late filing penalties issued by HMRC in 2024/25 (GOV.UK).
• 62% of UK SMEs now use an external accountant (ONS, 2026).

Decision Tree: What Do You Need? → Who to Speak To?

Next Steps

1. Review your expense categories and gather digital records for 2025/26 and 2026/27.
2. Book a free consultation with an ICAEW or AAT qualified adviser at Tax Return Accountants.
3. Switch to digital software (Xero, QuickBooks, FreeAgent, Sage) before MTD becomes mandatory.

Why Choose Tax Return Accountants?

• ICAEW regulated
• AAT accredited
• Fixed fees from £7.50/month
• Making Tax Digital compliant
• Dedicated accountant
• UK-wide service
• Leicester based
• Free initial consultation