How to claim tax relief on work expenses

The rule for employees is set out in section 336 of the Income Tax (Earnings and Pensions) Act 2003, within Part 5 on deductions allowed from earnings. A deduction is available where the employee is obliged to incur and pay the amount as holder of the employment, and the amount is incurred wholly, exclusively and necessarily in the performance of the duties.

Wholly and exclusively means the cost has no private element at all, or that a private element can be cleanly separated. A suit worn to work fails, because clothing that is suitable for ordinary wear serves a private purpose whether you intend it to or not. This is why a barrister's court dress and a nurse's uniform can qualify and a business suit never does.

Necessarily is the harder word. It is assessed objectively: would any holder of that job have had to incur this cost in order to do it? An expense that was helpful, that your manager encouraged, or that you chose to incur to work better does not qualify. Courts have consistently applied this strictly, and it is the reason most speculative claims fail.

In the performance of the duties excludes anything that merely puts you in a position to perform them. Ordinary commuting is the classic example: travelling to your permanent workplace is preparation for the job, not the job, and it is never allowable however far you travel or however unsociable the hours.

The cost must not have been reimbursed. If your employer paid you back, there is nothing left to relieve. Where an employer reimbursed part of the cost, you can claim relief on the shortfall — this is where most legitimate mileage claims come from.

Employees and the self-employed are governed by different rules, and this matters. The self-employed test is wholly and exclusively, without necessarily, and it is noticeably more permissive. Advice written for sole traders about home offices, travel and equipment frequently does not transfer to employees, and this is the commonest source of incorrect claims.

Where a claim is genuinely marginal, the safe approach is to claim it and keep the evidence rather than to inflate it. HMRC has been checking employment expense claims much more actively in recent years, and it has restricted some claim routes precisely because of volume abuse driven by refund agents.

Uniforms, protective clothing and specialist workwear qualify where the clothing is not suitable for everyday wear — a branded uniform, protective boots, high-visibility gear, a chef's whites. Relief covers the cost of cleaning, repairing and replacing it where the employer does not provide that, but not the initial cost of a uniform the employer supplied.

Tools and equipment you must buy yourself to do the job qualify. For many trades this is handled through flat rate expenses rather than receipts, and there is a published list of agreed annual amounts by industry and occupation covering everyone from joiners and mechanics to nurses and airline cabin crew. Claiming the flat rate needs no evidence at all; claiming actual costs above it needs receipts.

Professional fees and subscriptions qualify where the body appears on HMRC's approved list and membership is relevant to your job — professional registration, chartered body membership, some union subscriptions where a portion relates to professional activity. A subscription to a body not on the list does not qualify, however professionally useful.

Business travel qualifies where it is travel in the performance of the duties: journeys between workplaces, visits to clients or sites, and travel to a temporary workplace. Travel to a permanent workplace does not. Where a workplace is temporary — attended for a limited duration and expected to be so — travel to it can qualify, and the rules on when a site stops being temporary are detailed and worth reading if this describes your job.

Where you use your own car, van, motorcycle or bicycle for business journeys, relief is available on the approved mileage rates less anything the employer paid you. If your employer pays less per mile than the approved rate, the shortfall is claimable; if it pays more, the excess is taxable. Keep a mileage log with dates, destinations, purpose and distance — this is the single most commonly requested piece of evidence.

Overnight subsistence on business trips, and a limited allowance for incidental personal expenses while away, can qualify. Ordinary meals bought at your normal workplace do not.

Buying other equipment — a computer, a phone, specialist software — can qualify where it is needed to do the job and the private use is insignificant. Capital allowances rather than a straight deduction may apply, and the private use test is applied realistically, so a laptop used for family purposes in the evening is a problem.

During the pandemic, the working-from-home allowance was administered on relaxed terms and enormous numbers of people claimed it for a whole tax year on the strength of a few weeks at home. That relaxation has gone, and the ordinary rule is much narrower.

The test now is whether you are required to work from home, not whether you choose to or your employer permits it. That means your job requires you to live far from the office and no appropriate facilities are available, or your employer has no premises at all, or the duties genuinely require you to be at home. A hybrid arrangement where you may work at home some days and could go to the office does not qualify.

Where you do qualify, relief is available on a flat weekly amount without evidence, or on the actual additional household costs incurred because of working from home — the extra gas, electricity and metered water, and business phone calls. It does not cover rent, mortgage interest, council tax or broadband you would have paid anyway, because those are not additional costs.

If your employer pays you a homeworking allowance, that is generally not taxable up to the published limit and there is nothing further to claim. Claiming relief as well as receiving a tax-free allowance is a duplicate claim.

This is the area where the largest volume of incorrect claims sits, partly because the pandemic normalised claiming and partly because agents market it aggressively. HMRC has been checking these claims, and an incorrect claim is recoverable with interest and potentially a penalty.

The practical test to apply to yourself is simple: if you could work at your employer's premises but prefer not to, you do not qualify. If there is nowhere for you to go, or the job cannot be done there, you probably do. Where it is genuinely arguable, ask your employer to confirm the requirement in writing before claiming.

The fastest route is your Personal Tax Account on GOV.UK, signed in through GOV.UK One Login or Government Gateway. The online service walks through the categories, and for straightforward claims it adjusts your tax code so the relief comes through your pay rather than as a lump sum.

If you cannot use the online service, form P87 — the postal claim for tax relief on job expenses — does the same job. HMRC has tightened what must accompany a postal claim, so send the supporting evidence it asks for rather than a bare form, or it will be rejected.

If you already file a Self Assessment return, put the expenses in the employment pages of the return rather than making a separate claim. Duplicating a claim across both routes causes delay and correspondence.

You can normally claim for the current tax year and the four previous ones. That means a worker who has been buying their own tools for years can make a single claim covering several years at once, which is where the eye-catching refund figures in advertising come from — they are usually several years bundled, not one year's relief.

Where the claim is accepted for an ongoing cost, HMRC will usually build it into your tax code for future years, so you do not have to claim again each year. Check your coding notice when it arrives to confirm it is there, and tell HMRC if the cost stops, because leaving an obsolete allowance in your code creates an underpayment.

Keep evidence for the period HMRC specifies: receipts, a mileage log, your employer's confirmation of what it did and did not reimburse, and any written requirement to work from home. Flat rate expense claims do not need receipts, which is precisely why they are the sensible default for trades that have one.

Be wary of anyone offering to handle it for a share of the refund. Signing an assignment of your repayment can mean HMRC pays the agent rather than you, and unwinding that is difficult. HMRC's own guidance warns about this, and the claim you would be paying for is free.

The relief is worth your marginal rate of Income Tax. A basic rate taxpayer gets back the basic rate on the allowable amount; a higher rate taxpayer gets more for the identical expense. Someone earning below the personal allowance and paying no Income Tax gets nothing, because there is no tax to relieve — which is worth knowing before spending time on a claim.

Scotland matters here. Scottish taxpayers pay Scottish rates of Income Tax on employment income, and those rates and bands differ from the rest of the UK. The relief is given at the Scottish marginal rate, so the same expense is worth a different amount to a Scottish taxpayer than to one in England. Wales has the power to set Welsh rates within the UK band structure and does so annually.

National Insurance is not affected. Employment expense relief reduces Income Tax only; it does not reduce the National Insurance you or your employer paid on the earnings. This surprises people who expect a proportionate saving across both.

Where relief is given through a tax code change rather than a repayment, the benefit arrives as slightly higher take-home pay spread across the remaining pay periods of the year rather than as a single payment. That is not HMRC withholding anything; it is the same money delivered differently, and it is generally the faster route.

If your employer reimburses expenses under an approved arrangement, they will not appear on your P11D and there is nothing to claim. If your employer reports reimbursed expenses as a benefit, check whether an offsetting deduction should be claimed so you are not taxed on a cost you did not ultimately bear.

For anyone whose expenses are substantial and recurring — a large annual tool spend, heavy business mileage, several professional subscriptions — it is worth checking whether your employer could reimburse the cost directly instead. A direct reimbursement returns the whole cost rather than the tax on it, and for the employer it is usually deductible. Asking is free, and the arithmetic favours it overwhelmingly.