Tax explained
Allowable Expenses Guide
Allowable expenses reduce taxable profit when they meet HMRC rules. The key question is not whether a cost feels business-related, but whether it is allowable for that income source.
Quick answer
What are the key takeaways?
Allowable expenses must meet HMRC rules for the relevant trade, property business or company.
Key takeaways
Allowable expenses must meet HMRC rules for the relevant trade, property business or company.
Evidence matters: keep invoices, receipts, mileage records and business notes where needed.
Some costs are partly allowable, some are disallowed and some need special treatment.
Check current HMRC guidance on gov.uk before claiming uncertain costs.
What does allowable expense mean?
An allowable expense is a cost that tax rules let you deduct when calculating taxable profit. The exact test depends on whether you are a sole trader, landlord, partnership or limited company.
For many sole-trader costs, the familiar principle is whether the expense is incurred wholly and exclusively for the business.
Which expenses are commonly reviewed?
Common areas include travel, mileage, home-working costs, software, professional fees, phone costs, equipment, training, insurance, bank charges and subcontractor costs.
Common does not automatically mean allowable. The purpose of the spending and the evidence behind it matter.
How should you keep evidence for expenses?
Keep invoices, receipts, bank records and notes explaining the business purpose where the reason may not be obvious later.
Digital capture can work well, but the record still needs to be readable, complete and linked to the transaction it supports.
What happens if an expense is partly personal?
Mixed-use costs need care. The business element may be allowable if it can be identified on a reasonable basis, but the private element should not be claimed.
Where the split is unclear, Countify can help apply a practical method and explain the records needed to support it.
Questions
What do people ask about allowable expenses?
These answers cover the practical points clients commonly raise before asking Countify to review their own position.
Ask a different questionSometimes other evidence may help, but receipts and invoices are the strongest support. Keep the best evidence available for each claim.
Client entertaining is often restricted for tax purposes. Check HMRC guidance or ask an accountant before claiming it.
Yes. Countify can review expense categories, identify likely issues and help organise records before a return is filed.
Related advice
Which advice should you read next?
These related guides connect the next practical questions around this topic.
Self-Assessment
Self-Assessment is how you report taxable income and gains that HMRC cannot fully tax automatically.
Making Tax Digital
Making Tax Digital requires digital record-keeping and compatible software for affected taxes.
Choosing an accountant
Check the accountant's qualifications, experience and regulatory position.
Related tools
Which calculator can help you estimate the numbers?
Use these tools for quick estimates before asking Countify to review the facts.
Self-Employed NI Calculator
Class 2 and Class 4 NI for sole traders. 6% / 2% bands handled automatically.
Rental Income Tax Calculator
Section 24 mortgage interest credit, allowable expenses, higher-rate landlord impact.
Sole Trader vs Ltd Co Calculator
Side-by-side take-home comparison: sole trader vs Ltd Co salary + dividends.
Related reading
Where can you read more UK tax updates?
Countify's blog covers practical updates for individuals, landlords and business owners.
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