The Complete Guide to Tax-Deductible Expenses for Small Businesses (UK 2025)


 

Travel & mileage expenses explained

Understand the rules for claiming travel and mileage in your UK business.

HMRC can ask you questions about specific travel expenses and mileage claims so understand the rules and make sure you have the correct evidence available to share if you are investigated by HMRC.


Home office expense claims (post-COVID)

Many of us enjoyed claiming working from home expenses during the COVID pandemic, employed and self employed as HMRC recognised the need to relax the rules for individuals to be able to claim a portion of their home running costs which they would otherwise not incurred when working away from home.

The rules have changed again since the end of the pandemic. Read on to understand how the new rules impact your working from expenses claims.


 

Meals & client entertaining – what HMRC allows

What you can claim for meals and client entertaining can depend on a variety of factors, such as your business structure - sole trader/self employed or limited company, as well as who you are entertaining, whether prospective or existing clients.

This is one area where lots of people get caught out - understand the rules here.


Common mistakes SMEs make with expenses claims

Running a small or medium-sized business means wearing many hats, but when it comes to expenses, too many owners swap the accountant’s cap for wishful thinking. From muddling personal and business costs to over-claiming for meals or travel, mistakes with expenses are one of the quickest ways to catch the eye of HMRC—and not in a good way.

The good news? Most errors are entirely avoidable with a little structure and discipline. In this piece, we’ll unpack the most common missteps SMEs make with expenses claims and show how to keep your records clean, compliant, and tax-efficient.