Tax Allowances for the Self Employed: What You Can Claim (and What You Can’t)

Being self-employed comes with a few freedoms: choosing your clients, setting your schedule, and occasionally having a heated debate with yourself about whether a coffee counts as a business expense.

But when it comes to tax, the big rule is simple: you’re taxed on your taxable profit, not your total income. That means HMRC looks at what you earned, then subtracts legitimate business costs, allowances, and reliefs before working out what you owe.

The trick is knowing what you can claim without getting creative in ways HMRC would not appreciate. Below, we’ll walk through the main tax allowances for the self-employed, how they reduce your Self Assessment tax bill, and where the line sits between “reasonable business cost” and “nice try.”

What you can claim: Core allowances and reliefs

Self-employed people are taxed on profit, not gross income. So the aim is to make sure your Self Assessment tax return includes every legitimate allowance, relief, and allowable expense you’re entitled to claim — while keeping your records clean enough to back it all up.

The main ones to know are:

• Personal Allowance: Most self-employed individuals can earn a tax-free amount before Income Tax starts. For 2026/27, the standard Personal Allowance is £12,570, although it reduces once your adjusted net income goes over £100,000
• Trading allowance: If your self-employed income is small, you may be able to use the £1,000 trading allowance instead of claiming actual expenses. This can be useful for side hustles or small amounts of trading income, but if your allowable expenses are higher than £1,000, actuals may save more tax.
• Property allowance: This is a separate £1,000 allowance for small amounts of property income, not your main trade. If you have both trading income and property income, you may be able to use both allowances.
• Capital allowances: These apply when you buy business assets you keep and use, such as tools, equipment, machinery, or some business vehicles. The Annual Investment Allowance can let you deduct the full value of qualifying plant and machinery from profits, up to the AIA limit. Cars have their own rules based partly on CO₂ emissions, because even your vehicle apparently needs a tax personality.
• Simplified expenses: Instead of calculating exact costs, you can sometimes use HMRC flat rates for vehicle mileage, working from home, and living at business premises. This can make self-employed expenses much easier to claim, especially if your records are more “organised chaos” than “accountant’s dream.”
• Allowable business expenses: These are day-to-day costs incurred “wholly and exclusively” for business purposes, such as software, advertising, office supplies, business travel costs, phone use, insurance, professional fees, stock, raw materials, and a business share of home costs. It does not matter whether you paid from a bank account or credit card, as long as the cost was genuinely for business and you keep evidence.

Used properly, these allowances and expenses reduce your taxable income, which can lower the amount of tax and National Insurance contributions you owe. The trick is choosing the right approach for each claim: the £1,000 trading allowance can replace actual expenses for trading income, while simplified expenses are flat rates for specific costs like mileage or working from home.

📌 Pro Tip: Don’t automatically claim the trading allowance because it sounds easy. If your real business costs are more than £1,000, claiming actual allowable expenses could reduce your tax bill more.

What you can’t claim (common pitfalls)

Self-employed tax relief only applies to costs that are genuinely for the business. If something has a private element, you can only claim the business portion — not the whole bill with a hopeful expression.

Common costs you can’t usually claim in full include:

• Private use of mixed costs: If your phone, internet, car, or home office costs are partly personal, only the business share is allowable. GOV.UK gives the example of claiming only the business portion of a mixed-use phone bill.
• Client entertainment: Taking a client out for lunch may help the relationship, but it usually will not reduce your tax bill. The tax system remains tragically unmoved by a nice starter.
• Everyday clothing: Normal clothes are not usually allowable, even if you wear them for work. Uniforms, protective clothing, or costumes may be different.
• Your own drawings: Money you take out of the business for yourself is not a business expense. It is profit you have withdrawn, not a cost you can use for tax relief.
• Loan capital repayments: You cannot claim repayments of the loan itself, though business loan interest and some finance charges may be allowable.
• Full household costs: Council Tax, mortgage interest, rent, utilities, internet, and similar costs are not fully deductible just because you work from home. You can usually only claim a reasonable business proportion or use simplified expenses.

The same principle applies if you also have rental income. The property allowance and tax-free allowances may help with small amounts, but they do not turn private costs into business costs. Keep the trade, the property income, and personal spending clearly separated unless you enjoy making your future tax return unnecessarily spicy.

📌 Pro Tip: Before claiming a mixed-use cost, write down how you worked out the business percentage. A sensible split is much easier to defend than a suspiciously round “100% business” claim.

Income tax, NICs, and bands (How the bill is built)

Your self-employed tax bill starts with profit, not gross income. In plain English:

self-employed income – allowable expenses = taxable profit

From there, HMRC applies your allowances, then works out Income Tax and National Insurance contributions.

For most self-employed people, the calculation looks like this:

• Personal Allowance: The first slice of income is tax-free, if you’re entitled to the full allowance.
• Income Tax: Taxable profit above your allowance is taxed at the basic, higher, or additional rate, depending on your total taxable income.
• Class 4 National Insurance: Paid on self-employed profits above the annual threshold.
• Class 2 National Insurance: May count toward your National Insurance record, depending on your profit level.

For 2026/27, the standard Personal Allowance is £12,570, and GOV.UK says Class 4 National Insurance is charged at 6% on profits from £12,570 to £50,270, then 2% above £50,270.

This is why good bookkeeping matters. If you know your profit during the year, you can forecast the amount of tax and National Insurance you’re likely to owe, including any payments on account. Much better to spot the bill early than meet it in January wearing yesterday’s confidence and a haunted expression.

📌 Pro Tip: Set aside a percentage of each payment as it comes in. Your future tax bill is less terrifying when the money has not already been spent on “business essentials” and emergency biscuits.

Choosing between trading allowance vs actual expenses

The trading allowance is simple: you can deduct up to £1,000 from your trading income instead of claiming your real business costs. It is useful when your expenses are low, your records are light, and you want the easiest route through Self Assessment.

But simple is not always cheaper. If your actual business costs are more than £1,000, claiming allowable expenses will usually reduce your taxable profit more.

Option	Best when	Watch out for
Trading allowance	Your business costs are under £1,000	If you claim it, you generally cannot deduct actual expenses, simplified expenses, or capital allowances for that trading income.
Actual expenses	Your business costs are over £1,000	You need proper records and receipts.
Actual expenses with a loss	Your costs are higher than your income	You may be able to claim or carry forward the loss, but you must report it properly.
No reporting needed	Your gross trading income is £1,000 or less and no restrictions apply	You may still need to report if you want to claim a loss, pay voluntary Class 2 NICs, or claim certain benefits.

You cannot mix the trading allowance with actual expenses or capital allowances for the relevant trading income in the same tax year. If you claim the trading allowance, GOV.UK says you cannot deduct allowable expenses or claim other allowances on that income.

For a basic rate taxpayer, the difference can still be worth checking. An extra £500 of allowable expenses could save £100 in Income Tax, before National Insurance is even considered. Tiny spreadsheet, real money.

📌 Pro Tip: Run both numbers before filing: income minus £1,000, then income minus actual expenses. Use whichever gives the lower taxable profit, as long as you meet the rules and can back it up.

Vehicles and the mileage allowance (or actual costs)

If you use a car, van, or motorcycle for business, you can claim the cost in one of two ways: HMRC’s mileage allowance or the business share of your actual vehicle costs. You cannot use both methods for the same vehicle.

The mileage allowance is the simpler option. Instead of adding up fuel, insurance, repairs, servicing, and other running costs, you claim a flat rate for each business mile:

• Cars and vans: 45p per mile for the first 10,000 business miles
• Cars and vans: 25p per mile after 10,000 business miles
• Motorcycles: 24p per mile

This only applies to business journeys. Ordinary commuting, personal errands, and “I happened to think about work while driving to Tesco” do not count.

If you use the actual-cost method, you claim the business proportion of vehicle costs instead. This can include fuel, insurance, repairs, servicing, vehicle tax, breakdown cover, and capital allowances where relevant. You’ll need good records, especially if the vehicle is used for both business and personal trips.

Once you choose the mileage method for a vehicle, you usually need to keep using it for that vehicle while it stays in the business. So it’s worth comparing both methods before deciding.

📌 Pro Tip: Keep a mileage log from the start, including the date, destination, purpose, and business miles for each journey. It is much easier than trying to rebuild a year of travel from calendar entries and mild panic.

Cash basis vs traditional (accruals)

For many self-employed people, cash basis accounting is now the default method. It keeps things simple: you record income when you’re paid and expenses when you pay them, rather than when invoices are issued or bills arrive. For freelancers, consultants, and sole traders with straightforward books, this can make Self Assessment feel much less like a Victorian punishment device.

Method	How it works	Often suits
Cash basis	You record money when it actually comes in or goes out	Freelancers, sole traders, and simple service businesses
Traditional accounting / accruals	You record income and costs when they’re earned or incurred, even if payment happens later	Larger businesses, stock-heavy businesses, or businesses with more complex finances

Cash basis can be especially useful if you want a clearer view of real cashflow. If a client has not paid you yet, that income is not counted until the money lands. Small mercy, large emotional benefit.

Traditional accounting may be better if your business holds stock, buys significant raw materials, has larger business premises costs, or needs a more detailed picture of profit and liabilities. It can also make more sense where accounts need to match a fuller commercial picture, not just money in and money out.

This is not a tax exemption in itself. It is a way of working out your taxable profit, so it affects when income and expenses are counted rather than whether they exist at all.

📌 Pro Tip: Don’t choose cash basis just because it sounds easier. If you have stock, unpaid invoices, loans, or big equipment purchases, ask whether traditional accounting gives a more accurate picture before filing.

Record-keeping that protects your claim

Good records are what turn a tax claim from “I’m pretty sure this was business-related” into “here is the evidence, beautifully behaved and ready to go.”

For self-employed expenses, keep:

• Invoices
• Receipts, including credit card slips
• Bank and credit card statements
• Mileage logs, if you claim vehicle costs
• Supplier records
• Proof of payment
• Notes explaining mixed-use costs, such as phone, internet, or home office bills

A dedicated business bank account can make this much easier. It does not have to be fancy, but it should help you separate self-employed income and expenses from personal spending. Future-you does not want to search through 11 months of supermarket transactions trying to find one software subscription. Future-you has suffered enough.

Tag each cost clearly as being for business purposes, and keep digital copies where possible. If you use simplified expenses, save the calculation you used, not just the final number. HMRC does not need a scrapbook, but it does expect you to show how you got there.

📌 Pro Tip: Add a short note to any receipt that is not obvious. “Client meeting,” “business travel,” or “home office equipment” can save a lot of head-scratching later, especially when a receipt simply says “miscellaneous” and offers no further emotional support.

Limited Company vs Sole trader (Why it matters)

A sole trader and a limited company may look similar from the outside — same laptop, same invoices, same quiet panic when a client says “quick call?” — but the tax rules are different.

Business structure	How tax works	What to watch
Sole trader	You pay Income Tax and National Insurance on your business profit through Self Assessment.	You claim allowable expenses against your trading income and keep records of income and costs.
Limited company	The company pays Corporation Tax on its profits; you may take money out as salary, dividends, or director’s loans.	Company money is not automatically “your” money, and dividends have their own paperwork and tax rules.
Partnership	Partners usually report their share of profits through Self Assessment.	Records need to show both partnership income and each partner’s share.

For 2026, Corporation Tax is 19% for companies with profits under £50,000 and 25% for companies with profits over £250,000, with marginal relief between those limits. That is a company rule, not a sole-trader rule. Sole traders do not pay Corporation Tax.

The same goes for dividends. If you run a limited company, dividends can be part of how you take profit out of the business, but they are not a business expense and must be supported by dividend vouchers. GOV.UK also notes that shareholders may have to pay Income Tax on dividends over the dividend allowance.

For our purposes, the key point is simple: do not apply company rules to a sole-trader tax return. If you are self-employed as a sole trader, focus on trading income, allowable expenses, capital allowances, simplified expenses, and clean records for Self Assessment.

Whatever structure you use, keep bank statements and business records organised. GOV.UK says sole traders must keep records of business income and expenses for their Self Assessment tax return, and limited companies have different record-keeping rules.

📌 Pro Tip: If your profits are rising, do not switch to a limited company just because someone on the internet said it was “more tax efficient.” The right structure depends on profit, admin, how you take money out, and whether the extra paperwork is worth it.

Previous tax year corrections and benefits interactions

If you missed an expense, used the wrong allowance, or claimed the wrong amount in a previous tax year, you may still be able to correct it.

On GOV.UK, you can usually amend a Self Assessment tax return within 12 months of the Self Assessment deadline. After you amend it, HMRC will update your bill. That could mean:

• You owe more tax
• You are due a refund
• Your payments on account change
• HMRC asks for evidence to support the correction

If you claim Universal Credit, check the benefit impact before submitting or changing figures. Self-employed claimants usually report income and expenses each month, and those numbers can affect Universal Credit payments.

Before amending anything, make sure you have:

• Invoices or receipts for the expense
• Bank or credit card records
• A note explaining what changed
• Copies of the original and corrected figures
• Any Universal Credit records affected by the update

📌 Pro Tip: Tax rules and Universal Credit rules do not always match. Before correcting a return, check whether the same change could affect your HMRC bill, your Universal Credit payments, or both.

Claim confidently, not creatively

The best tax savings usually come from using the rules properly: choosing between the trading allowance and actual expenses, claiming capital allowances where they apply, using simplified expenses when they make sense, and keeping clean records for genuine business costs.

The tricky part is knowing which route gives you the best result without creating problems later. A free consultation through Unbiased can help you sense-check your setup, understand what you can claim, and spot allowances or reliefs you may be missing. 

Book yours here and get matched with an adviser who can help you reduce your tax bill legally, clearly, and without playing “guess the expense” at Self Assessment time.

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