Running a business in the UK is as much about managing what goes out as what comes in. For the 2026/27 tax year, HMRC has introduced several shifts—particularly around Making Tax Digital (MTD)—that make accurate expense tracking not just a "good idea," but a legal necessity for many.

This guide breaks down exactly what you can claim to lower your tax bill, focusing on the latest 2026 rules for sole traders and limited companies.

1. The Golden Rule: "Wholly and Exclusively"

To claim any business expense in the UK, it must pass the HMRC litmus test: it must be incurred wholly and exclusively for the purposes of your trade.

If an expense has a dual purpose (part-business, part-personal), you can generally only claim the business proportion. For example, if your mobile phone bill is £100 and you use it 50% for work, you claim £50.

2. Remote Working & Home Office Expenses

The "Working from Home" landscape has changed for 2026. While the flat-rate "Working From Home Allowance" for employees has been removed, self-employed individuals still have two main paths:

Method A: Simplified Expenses (Flat Rate)

If you work more than 25 hours a month from home, you can use these 2026/27 flat rates:

• 25–50 hours: £10 per month

• 51–100 hours: £18 per month

• 101+ hours: £26 per month

Method B: Actual Costs

You can calculate the business proportion of your actual rent, mortgage interest, council tax, and utilities.

Example: If you have a 5-room house and use one room exclusively as an office, you can generally claim 1/5th (20%) of your qualifying household bills.

3. Travel and Vehicle Costs

Mileage remains one of the most significant claims for UK SMEs. Despite rising fuel costs, the Approved Mileage Allowance Payments (AMAP) remain frozen for the 2026/27 year.

2026/27 Mileage Rates

Electric Vehicles (EVs): If you use a company EV, the advisory electricity rate for public charging has increased to 15p per mile (as of March 2026), while home charging remains at 7p per mile.

4. Marketing, Software & Technology

In a digital-first economy, these are often your highest "invisible" costs.

• Advertising: Google Ads, LinkedIn Ads, and local SEO services (like those provided by Indowebtech or TaxVat).

• Subscriptions: Professional software (Adobe, Microsoft 365) and CRM tools.

• Website: Hosting, domain renewals, and maintenance.

5. Professional Fees & Training

You can claim for costs that keep your skills sharp or your business compliant:

• Accounting & Legal: Fees for filing your tax returns or business legal advice.

• Professional Insurance: Public Liability, Professional Indemnity, and Employers' Liability.

• Training: Courses that update your existing skills. (Note: HMRC usually blocks claims for learning completely new skills unrelated to your current trade).

6. What You Cannot Claim (The Red Flags)

Avoid these common mistakes to prevent an HMRC inquiry:

• Client Entertainment: Taking a client to lunch is not tax-deductible (though staff parties up to £150 per head per year are).

• Commuting: Travel between your home and your permanent place of work is personal travel.

• Ordinary Clothing: You cannot claim for a business suit. You can claim for branded uniforms or protective gear (PPE).

Strategic Focus: Making Tax Digital (MTD) 2026

From April 2026, if you are a sole trader or landlord with a total qualifying income over £50,000, you are mandated to join MTD for ITSA.

This means:

1. You must keep digital records of every expense.

2. You must send quarterly updates to HMRC.

3. Paper receipts are essentially dead; digital capture is now the standard.

Final Thought

Managing expenses is about more than just "saving receipts." It’s about building a robust financial foundation. If you’re approaching the MTD threshold or navigating UK tax for the first time, getting your strategy right in Q1 will save you from a major headache in Q4.

Unsure if a specific cost is "allowable"? It’s always best to consult a professional who understands the specific nuances of the 2026 UK tax landscape.

Email: info@taxvatreturn.co.uk

Call: 01284 332375