Allowable expenses for UK freelancers: what you can and can't claim

Why allowable expenses matter

As a sole trader, you pay Income Tax and National Insurance on your profit, not your turnover. Profit is what's left after you subtract allowable business expenses from your income. Claim less than you're entitled to and you overpay tax. Claim things you shouldn't and you risk a penalty if HMRC checks.

Neither is a good outcome. This guide covers what you can and can't claim as a UK freelancer, in plain terms, so you're not guessing at tax return time.

The golden rule: wholly and exclusively

HMRC's test for an allowable expense is that it must be wholly and exclusively for the purposes of your trade. If something has a personal benefit as well as a business one, you generally can't claim the full cost, and in some cases you can't claim it at all.

This single rule explains most of the confusion around expenses. A laptop used only for client work is clearly allowable. A laptop your kids also use for homework needs a reasonable business-use split. A meal out with a friend, even if you talk about work, is not allowable at all.

What you can claim

Equipment and tools

Computers, monitors, cameras, software subscriptions, and other kit you need to do your job. If you use something for both business and personal life, only the business-use proportion is allowable, and you'll need a reasonable basis for that split.

Office costs

Stationery, printing, postage, and business phone and internet costs (again, apportioned if the line is also personal).

Working from home

If you work from home, you can claim a proportion of your household costs: rent, mortgage interest, utilities, and council tax, based on the rooms used for work and the time spent working. HMRC also offers a simplified flat rate (see below) if you'd rather skip the calculation.

Travel

Travel to meet clients, attend a job, or visit a co-working space counts, including train fares, mileage, parking, and the odd taxi when it's genuinely for business. Your regular commute to a fixed place of work doesn't count, but most freelancers don't have one of those anyway.

Professional costs

Accountancy fees, business insurance, professional subscriptions relevant to your trade, and bank charges on a business account are all allowable.

Marketing

Website hosting, a domain name, business cards, and paid advertising all count as allowable marketing spend.

Training

Courses that maintain or update skills you already use in your trade are allowable. Training for a brand new skill or a different line of work generally isn't, because HMRC treats that as a capital cost of starting a new trade rather than running your existing one.

What you can't claim

Client entertainment

Taking a client to lunch or drinks feels like a business cost, but HMRC specifically excludes client entertainment. This is one of the most commonly misunderstood rules, so it's worth remembering on its own.

Everyday clothing

You can't claim a suit or smart-casual outfit just because you wear it to client meetings, even if you'd never buy it otherwise. The exception is genuine protective clothing or a uniform with a business logo that you wouldn't wear day to day.

Personal living costs

Rent or a mortgage payment in full, your weekly food shop, gym membership, or anything that's really a personal cost with a business excuse attached. If in doubt, ask whether you'd be paying for it anyway if you weren't self-employed.

Fines and penalties

Parking tickets, speeding fines, and similar penalties are never allowable, even if they happened on a business trip.

The clients you're chasing

If a client doesn't pay you, that unpaid invoice isn't an expense you claim. It simply reduces the income you've received. Bad debt relief works differently and mostly applies to VAT-registered businesses on specific accounting schemes.

Simplified expenses: the flat-rate option

If you'd rather not track exact costs and calculate a business-use percentage every year, HMRC lets sole traders use simplified expenses for two common areas:

• Mileage: a flat rate per business mile for cars, vans, and motorbikes, instead of totting up fuel, insurance, and maintenance
• Working from home: a flat monthly amount based on hours worked from home, instead of calculating a proportion of household bills

Simplified expenses aren't always the biggest number you could claim, but they save time and remove the guesswork. If your actual costs are clearly higher, working them out properly can be worth the extra admin. If you're not sure, it's worth running both ways once to see which suits you.

Capital allowances: the bigger purchases

Big-ticket items like a new laptop, camera equipment, or a company vehicle usually fall under capital allowances rather than day-to-day expenses. Most freelancers use the Annual Investment Allowance, which lets you deduct the full cost of qualifying equipment from your profit in the year you buy it, up to a generous annual limit. It's worth flagging any large purchase to your accountant, or checking HMRC's guidance, so it's claimed the right way.

Record-keeping: the part people skip

None of this matters if you can't back it up. HMRC expects you to keep records of income and expenses for at least five years after the 31 January submission deadline for the relevant tax year. That means:

• Receipts and invoices for anything you claim
• A note of the business purpose if it isn't obvious
• Your working for any apportioned costs, like the home-working percentage you used

Paper receipts fade and get lost. Logging expenses as they happen, categorised properly, is far less painful than reconstructing a year of spending in January. It also matters more than ever with Making Tax Digital on the way: quarterly digital updates only work if your records are already digital and current.

The bottom line

Allowable expenses aren't a grey area if you apply the wholly-and-exclusively test consistently and keep decent records. Claim what genuinely serves your trade, apportion anything with a personal element, skip anything on HMRC's exclusion list, and keep the paperwork to prove it. Get that right and your tax bill reflects your actual profit, not more and not less.

Clean, categorised records also make self assessment far less stressful when January rolls around, and they're exactly what you'll need once quarterly digital reporting applies to you.