Allowable Expenses: What You Can (and Can't) Honestly Claim
- Jul 3
- 6 min read
Category: SME Tax Services
Let’s be honest: nobody starts a business because they’re excited about tax returns. You started your business to solve problems, create something great, or finally be your own boss. But when that January Self Assessment deadline starts looming, or your quarterly VAT return pops up, the "T-word" suddenly becomes very important.
As an SME owner or a sole trader in the UK, one of the most powerful tools in your financial arsenal is the concept of allowable expenses. Think of them as a "government discount" on your business costs. Every pound you legitimately claim as a business expense is a pound you aren’t paying tax on.
But there’s a catch. HMRC has very specific ideas about what counts as a business expense and what is just you trying to write off your weekend lunch. If you get it right, you save thousands. If you get it wrong, you’re looking at fines, interest, and the dreaded "HMRC inquiry."
In this guide, I’m going to break down exactly what you can (and absolutely can't) claim in 2026, so you can keep more of your hard-earned cash.
The Golden Rule: "Wholly and Exclusively"
Before we look at specific items, you need to understand the "Golden Rule" of UK tax. For an expense to be allowable, it must be incurred wholly and exclusively for the purposes of your trade.
What does that actually mean? It means if you bought something for the sole purpose of running your business, it’s usually fine.
Where it gets tricky is "dual-purpose" items. If you buy a laptop and use it 50% for client work and 50% for Netflix and gaming, you can’t claim the whole thing. You have to apportion it. However, some things, like a nice suit for meetings, fail the test entirely. Even though you wear it for work, HMRC argues that it also serves the "personal purpose" of keeping you warm and decent. Since you can’t separate the "business" part of the suit from the "personal" part, you can’t claim a penny.
1. The Home Office: More Than Just a Desk
Since the shifts of the last few years, more SMEs than ever are run from spare bedrooms and kitchen tables. If you work from home, you are entitled to claim a portion of your household bills.
You have two ways to do this:
The "Actual Costs" Method
This is usually better for people with high utility bills or larger dedicated office spaces. You look at your total household costs, rent, mortgage interest (not the capital repayment!), council tax, heating, and electricity, and work out a fair proportion based on the number of rooms in your house and the time you spend working.
Example: If you have 5 rooms and use one as an office 100% of the time, you could claim 1/5th (20%) of your eligible bills.
The "Simplified Expenses" Method
If you don't want the headache of spreadsheets, HMRC offers a flat rate based on the hours you work from home each month:
25 to 50 hours: £10 per month
51 to 100 hours: £18 per month
101 hours or more: £26 per month
Richard’s Pro Tip: Don't forget your broadband and phone! These aren't included in the flat rate. You can claim the business proportion of these on top of the flat rate.
2. Travel and Transport: Beyond the Petrol Pump
Travel is one of the biggest areas of confusion. The most important thing to remember is that commuting does not count. Travelling from your home to a permanent place of work is personal travel in the eyes of HMRC.
However, travel to a client’s office, a networking event, or a temporary site is fully allowable.
Mileage Rates
If you use your own car for business, the easiest way to claim is via the Approved Mileage Allowance Payments (AMAP). For 2026, these remain:
Cars and Vans: 45p per mile for the first 10,000 miles, then 25p thereafter.
Motorcycles: 24p per mile.
Bicycles: 20p per mile.
Public Transport and More
Train fares, bus tickets, flights, and even Ubers are allowable, provided the trip is 100% for business. If you stay overnight for work, your hotel room and a "reasonable" meal (subsistence) are also claimable. Just keep the receipts!
3. Marketing and Professional Fees
To grow, you need to spend money. Luckily, HMRC is quite generous here.
Advertising: Everything from Google Ads and Facebook campaigns to the cost of printing flyers and business cards.
Websites: Domain names, hosting fees, and the cost of hiring a developer to maintain your site are all 100% allowable.
Professional Fees: This is a big one. The fees you pay to your accountant, bookkeeper, or solicitor for business matters are fully deductible.
In fact, hiring an expert often pays for itself. If an accountant costs you £1,000 but finds £2,000 in missed expenses, you’ve actually made money. You can find a qualified accountant to review your books here.
4. The "Hidden Gems": Expenses You’re Probably Missing
Most people remember the big stuff, but it's the small, recurring costs that add up over a year. Are you claiming for these?
Software Subscriptions: That £10/month for Zoom, your Canva subscription, or your project management tool like Trello or Asana? They’re all business expenses.
Bank Charges: If you have a dedicated business bank account, those monthly fees and transaction charges are allowable.
Training and CPD: If you’re taking a course to update your existing skills (e.g., a graphic designer learning a new version of Photoshop), it’s allowable. (Note: Learning a completely new career path usually isn't).
Uniforms and PPE: While you can't claim for a suit, you can claim for branded clothing (like a polo shirt with your logo) or protective gear like steel-toe boots.
5. The Red Zone: What You Definitely CAN'T Claim
This is where people get into trouble. If you try to claim these, expect a "Please Explain" letter from the tax office:
Client Entertaining: This is the most common mistake. You take a client out for a fancy dinner to close a deal. It's definitely for the business, right? True, but HMRC rules specifically forbid claiming for hospitality or entertainment for anyone other than your employees. You pay for that lunch out of your post-tax profits.
Everyday Clothing: As mentioned, if you can wear it "on the street" and look normal, you can't claim it. This includes suits, evening wear, and even branded clothing that doesn't count as a "uniform."
Fines and Penalties: Got a parking ticket while visiting a client? Speeding on the way to a pitch? HMRC views these as avoidable and personal, so they aren't allowable business expenses.
Gym Memberships: Unless you are a professional athlete or a fitness influencer where the gym is literally your workplace, this is a personal cost.
Record Keeping in the Digital Age (MTD)
With Making Tax Digital (MTD) becoming the standard for most UK businesses by April 2026, paper receipts in a shoebox are no longer an option. You need to keep digital records of all your expenses.
I recommend using an app like Dext or Hubdoc (often bundled with Xero or QuickBooks). You just snap a photo of the receipt on your phone, and the AI extracts the data and files it away. It saves hours of manual entry and ensures you never lose a receipt down the back of the sofa.
Don't Leave Money on the Table
Taxes are complicated, but they don't have to be overwhelming. The difference between a business that struggles and one that thrives often comes down to smart financial management.
By claiming every legitimate expense, you lower your taxable profit, which means you pay less tax and keep more cash flow for growth.
If you’re sitting there wondering if that "workation" to Spain or that new ergonomic chair is truly allowable, don't guess. The rules for 2026 are stricter than ever, and a simple mistake can lead to an expensive headache.
Ready to stop overpaying the taxman?
At Accountant Search, we match SME owners like you with specialist accountants who know the "wholly and exclusively" rule inside out. They’ll review your spending, find the hidden gems you've missed, and ensure your filings are 100% compliant.
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