Claim the right expenses. Reduce your tax bill. File your Self Assessment with confidence.
If you’re completing a UK Self Assessment tax return, claiming the correct allowable expenses is one of the most effective ways to legally reduce how much tax you pay. However, what you can claim depends on whether you’re self-employed, a sole trader, or employed.
This guide explains what tax allowable expenses you can include, what you can’t claim, and how to make sure your claims are HMRC-compliant.
What Are Tax Allowable Expenses?
Allowable expenses are costs you incur wholly and exclusively for business purposes. HMRC allows you to deduct these expenses from your income, reducing your taxable profit and therefore your Income Tax bill.
If an expense is partly personal and partly business-related, you can usually claim only the business portion.
Allowable Expenses if You’re Self-Employed or a Sole Trader
If you’re self-employed, you generally have more flexibility when claiming expenses. The key rule is that the expense must be necessary for running your business.
Your allowable expenses will vary depending on your industry and profession, but most fall into the categories below.
Common Self Assessment Allowable Expenses (UK)
- Office, Property & Equipment Costs
You may be able to claim:
- Office rent or coworking space fees
- Stationery and office supplies
- Computers, laptops, phones, printers
- Software and business tools
Important:
- If you use cash basis accounting, many equipment costs can be claimed immediately.
- Under traditional accounting, assets lasting more than 2 years (e.g. computers or machinery) are usually claimed as capital allowances.
- Travel & Vehicle Expenses
You can claim business travel costs, including:
- Fuel, insurance, servicing, and repairs
- Parking and tolls
- Train, bus, and taxi fares
- Business accommodation
If a vehicle is used both privately and for work, you must apportion the costs based on business use.
You cannot claim travel between home and your usual place of work.
- Clothing & Uniform Expenses
You can claim clothing costs only if they are:
- A required uniform
- Protective clothing (e.g. safety boots, helmets)
- A costume used specifically for business purposes
Everyday clothing is not allowable, even if you wear it for work.
- Staff & Subcontractor Costs
Allowable staff expenses include:
- Salaries and wages
- Employer’s National Insurance
- Bonuses and pensions
- Payments to subcontractors
Domestic or personal help (e.g. childcare or nannies) cannot be claimed.
- Goods Bought for Resale
If you sell physical products, you can deduct:
- Goods purchased for resale
- Raw materials or production costs
Items taken for personal use must be excluded from your claim.
- Legal, Accounting & Financial Costs
You can claim:
- Accountant and bookkeeping fees
- Legal advice related to your business
- Surveyor or consultant fees
- Letting or management agent fees
- Bank charges, credit card fees, and loan interest
Your Self Assessment filing fee is itself an allowable expense.
- Marketing, Advertising & Subscriptions
Allowable marketing expenses include:
- Website design and hosting
- Online advertising (Google, social media)
- Branding and promotional materials
- Professional subscriptions and trade memberships
Client entertainment (meals, events, hospitality) is not allowable.
- Training & Professional Development
You can usually claim training costs if the course:
- Improves existing skills
- Is directly related to your current business
Training that helps you start a new trade is not allowable.
Employed? What Expenses Can You Claim?
If you’re employed, allowable expenses are more limited. You may claim costs that are:
- Required for your job
- Not reimbursed by your employer
Common examples include:
- Professional subscriptions
- Tools or equipment essential for your role
- Uniforms and protective clothing
What You Can’t Claim on Your Tax Return
HMRC does not allow:
- Personal living costs
- Normal clothing
- Home-to-work travel
- Client entertainment
- Fines or penalties
Claiming non-allowable expenses can trigger HMRC enquiries and penalties.
Why Accurate Expense Claims Matter
Correctly claiming expenses:
- Reduces your taxable profit
- Lowers your Income Tax and National Insurance
- Keeps you compliant with HMRC
- Prevents costly mistakes and audits
Keeping clear records and receipts is essential. HMRC can request evidence for up to 6 years.
File Your Self Assessment the Smart Way
Knowing what you can claim is only half the job — reporting it correctly is just as important.
Our UK Self Assessment service:
- Identifies the expenses you’re entitled to
- Ensures HMRC-compliant calculations
- Helps you pay the minimum tax legally due
- Files your return accurately and on time
Get started with your Self Assessment today and take the stress out of tax filing.
