The BIG Expenses Guide

Business expenses are one of the most misunderstood parts of tax.

Spend five minutes on social media and, apparently, your gym membership, Netflix, dog and daily flat white can all go “through the business”.

Usually, they can’t.

HMRC’s starting point is actually fairly simple.

For sole traders, you claim allowable costs that relate to the business. For companies, an expense must not be specifically disallowed and it must be for the business. If there is a genuine split between business and private use, only the business part is deductible.

So despite what the internet says, this is not really about how creative you can get. It is about whether the cost is genuinely business-related.

The core rule

The legal test is not, “Can I say this helped the business?”

It is whether the cost is incurred wholly and exclusively for the trade.

That is why personal spending does not suddenly become deductible just because work was mentioned somewhere nearby.

It also explains why so many “tax hacks” fall apart the moment you look at the actual rule.

Sole trader expenses

If you are a sole trader, the business is legally you.

That means personal and business spending need to be kept clearly separate.

The ordinary running costs are usually the easy ones. HMRC’s own guidance covers things like office costs, rent and utilities for business premises, insurance, website costs, advertising, business travel, trade journals, relevant trade-body memberships, and training that updates or supports the skills you already use in the business.

These are the bread-and-butter expenses. The normal, boring, sensible costs of actually running the business.

Mixed use costs

Some costs sit in the messy middle.

Phone bills, internet, working from home costs, laptops, and vehicles are often partly business and partly personal. In those cases, you claim the business part only.

HMRC accepts reasonable apportionment where a definite business proportion can be identified.

So if something is used partly for work and partly for normal life, you do not get to claim the whole lot just because some business use exists. You split it properly.

If you work from home, self-employed people can sometimes use simplified expenses instead of working out the exact household costs. The current flat-rate method is based on monthly business-use hours, and the home-working flat rate does not include phone or internet bills, which still need their own business-use split.

One boring point that matters

Not every purchase is a normal day-to-day expense.

If you buy something you keep to use in the business, like a computer or printer, the tax treatment can depend on whether you use cash basis or traditional accounting.

HMRC’s self-employed guidance points people towards capital allowances for some equipment under traditional accounting, and the company guidance makes the same distinction between ordinary revenue expenses and capital spending.

It is not the most exciting part of tax, but it matters. Because “I bought it for the business” does not always mean it is treated like a normal expense.

Clothing: still the classic trap

This one catches people every year.

Ordinary clothes are not deductible, even if you only wear them for work.

Uniforms, protective clothing and costumes for actors or entertainers can qualify.

But “I only wear it for clients” is not enough if it is still normal everyday clothing.

This is one of the clearest examples of where people confuse “work-related” with “tax-deductible”. They are not always the same thing.

Travel, food and the everyday-life problem

Business travel is usually fine.

Travel between home and work is not.

Hotel rooms and meals on overnight business trips can be allowable.

Your normal lunch, coffee or snack while working is not suddenly a tax deduction just because you answered emails while drinking it.

That is the everyday-life problem in a nutshell. Just because something happens during the working day does not make it a business expense.

Subscriptions, streaming and internet nonsense

Trade journals and trade-body memberships related to the business are usually fine.

HMRC also explicitly says gym membership fees are not allowable for the self-employed.

General entertainment subscriptions are much harder to justify. In practice, something like Netflix or Spotify would usually need a very clear business purpose rather than just, “I create content sometimes”.

That last point is an inference from HMRC’s general wholly-and-exclusively rule, not some special creator exemption.

Creators and influencers do not get a different tax system.

Cameras, microphones, lighting, editing software and genuine trade props can often be easier to justify than personal entertainment or lifestyle spending. Mixed use still needs care.

That is really the key point here. Content creators can still claim genuine business costs, but they do not get a free pass on personal spending dressed up as work.

Client entertainment vs staff entertainment

This is the split people often miss.

Taking clients out for meals, hospitality or tickets is generally not deductible for tax.

The fact that business was discussed over the table does not rescue it. HMRC’s business income guidance says business entertainment is generally not allowable as a deduction against profits.

Staff entertaining is different.

HMRC’s manual says staff entertaining can be allowable, provided it is genuinely for the business and not just incidental to entertaining clients. That is why staff parties sit in a different bucket from client lunches.

There is also a separate employee tax exemption for annual staff events.

To fall within it, the event must be annual, open to all employees or all employees at one location, and cost no more than £150 per head.

And this bit matters:

That £150 is not an allowance.

If an event falls outside the exemption, the full taxable amount can matter, not just the bit over £150.

Limited company expenses

A company is a separate legal entity, but the basic idea is still the same.

A company can deduct revenue expenses if they are not specifically disallowed and only have a business purpose. If a cost has a business element and a private element that can be clearly separated, only the business part may be deductible.

The company paying for something does not magically make it allowable or tax free.

That is a mistake people make all the time.

GOV.UK’s Corporation Tax guidance says anything you or your employees get personal use from must be treated as a benefit, and the employer benefits guidance says employers usually have to report benefits and pay tax and National Insurance on them.

So “the company paid for it” is not really the question.

The real question is whether it is genuinely a business expense, and whether any personal benefit has to be dealt with properly.

Trivial benefits

Small perks are a separate thing from normal business expenses.

A trivial benefit must cost £50 or less, must not be cash or a cash voucher, must not be a reward for work, and must not be written into the employee’s contract.

Close-company directors are capped at £300 of trivial benefits in a tax year, and salary-sacrifice arrangements do not qualify for the exemption.

Examples include:

• bottle of wine

• birthday gift

• flowers

• small thank-you gift

Trivial benefits can be useful, but only if you stay within the rules. They are not a workaround for putting personal spending through the company.

The myths worth ignoring

“Put your gym membership through the business.” Usually no.

“Call it marketing and HMRC has to allow it.” No.

“My company paid for it, so it’s deductible.” Also no.

If you need a heroic story to explain why a personal cost is somehow business-critical, you are probably already in the danger zone.

That is usually a pretty good sign the expense is being forced rather than justified.

Final thought

Business expenses are there to reflect the real cost of running a business.

They are not there to turn your personal life into a tax deduction.

Keep the logic simple.

Claim the genuine business costs.
Split mixed-use costs properly.
Keep records.
Ignore the social-media nonsense.

HMRC says you should keep records of your business expenses as proof and make sure those records are accurate.

That alone will put you in a better position than most of the people handing out “tax tips” online.