Tax Deductions for Locum Doctors That Count

A busy month of locum shifts can produce a healthy gross income, but the figure that matters for tax is your profit. For many clinicians, the difference comes down to understanding tax deductions for locum doctors, keeping sound records and claiming only costs that genuinely relate to earning that income.

This is not about stretching the rules. It is about ensuring that you do not pay tax on money you had to spend in order to work. The right approach depends on how you provide your services - as a sole trader, through a limited company, via an agency or under an employment contract - and on the facts behind each expense.

Start with your working arrangement

Before looking at individual expenses, establish how your locum income is taxed. A self-employed locum normally calculates taxable profit by taking business income less allowable business expenses, then reports it through Self Assessment. A doctor working through a limited company may claim qualifying costs through the company instead, subject to different rules around salary, dividends and benefits.

If you are paid under PAYE by an NHS trust, practice, agency or hospital, the rules are more restrictive. Employment expenses must generally be incurred wholly, exclusively and necessarily in performing your duties. A cost that is useful, expected or personally convenient is not automatically allowable.

It is also possible to have more than one arrangement at once. For example, you may carry out regular PAYE work for one organisation while undertaking genuinely self-employed locum sessions elsewhere. Do not assume that an expense is deductible in the same way across both income streams. Keeping each arrangement clear is a practical safeguard against errors.

Tax deductions for locum doctors: the core test

For self-employed work, a cost must be incurred wholly and exclusively for the purposes of the business. Where an expense has both business and personal use, only the business proportion may be claimed if it can be fairly identified. If the personal and business elements cannot sensibly be separated, the expense may not be allowable.

For limited companies, the company must similarly be able to show a genuine business purpose. The company should pay the expense directly where practical, or reimburse you under a clear expenses process. For employees, the additional requirement that the cost must be necessary is often the deciding factor.

This may sound technical, but the question is usually straightforward: would you have incurred this cost if you were not doing the locum work? Then ask whether any personal benefit is significant. A receipt alone does not make an expense tax deductible.

Travel, mileage and accommodation

Travel is one of the most valuable and most misunderstood areas for locums. Journeys from home to a permanent workplace are ordinarily commuting, so the cost is not claimable. Travel to a temporary workplace may be allowable, particularly where you travel between different practices, hospitals or clinics as part of your work.

The detail matters. If a placement becomes your regular base for a long period, it may no longer be treated as temporary. The 24-month rule can be relevant where you expect to attend a workplace for more than 24 months, or where attendance there represents a substantial part of your work. Employment status and the precise pattern of work can also affect the outcome.

If you use your own car for qualifying business journeys, you can usually claim mileage using the approved rates, rather than trying to claim fuel, servicing, insurance and depreciation separately. Keep a mileage log showing the date, destination, purpose of the journey and miles travelled. Parking fees and road tolls for business journeys may also be claimable, but parking fines are not.

Train fares, bus tickets, taxis and flights can be allowable when they relate to qualifying work travel. Accommodation and meals may be claimable where an overnight stay is necessary for a temporary assignment, rather than simply more convenient. The test is always the business need, not the distance travelled alone.

Professional costs that support your work

Several recurring costs are commonly relevant to locum doctors. Professional indemnity cover, GMC registration fees, membership subscriptions to approved professional bodies, appraisal costs and revalidation-related expenditure may be allowable where they are connected with your current work.

Training needs care. A course that maintains or updates skills you already use as a locum may be deductible. Training that gives you a new qualification, enables a new specialism or prepares you to enter a different area of work is more likely to be treated as capital or personal in nature. For instance, refresher training in an existing clinical field may be treated differently from a programme that qualifies you for an entirely new role.

Professional journals and medical publications can be claimed when they are directly relevant to your practice. The same principle applies to conference fees. Keep evidence of the agenda and its relevance to your work, especially where a conference includes social or leisure elements.

Equipment, software and your home office

A laptop, mobile phone, printer, clinical tools, stationery and specialist software can all be legitimate costs if they are used for your locum business. For items with mixed use, claim a realistic business proportion. A phone used 70 per cent for patient-related administration, rota management and professional communications should not be claimed at 100 per cent simply because it is useful for work.

Larger equipment may qualify for capital allowances rather than being deducted as an ordinary day-to-day expense. This is still valuable tax relief, but the timing and treatment can differ. The Annual Investment Allowance often allows qualifying equipment to be relieved quickly, although the right approach depends on who bought the asset and the business structure involved.

If you carry out administration at home - such as completing accounts, arranging shifts, preparing invoices or handling mandatory paperwork - you may claim an appropriate share of household costs, or use simplified expenses if eligible. A dedicated office can make the calculation easier to support, but it is not essential. Be cautious about claiming a large share of rent, mortgage interest or utility bills without a clear and reasonable basis.

Accountancy, insurance and financial administration

The cost of preparing your accounts, tax return and business records is generally an allowable expense for self-employed locum work. Bookkeeping software, invoicing systems, bank charges on a business account and fees for professional tax advice can also be claimed where they relate to the business.

Other insurance policies may qualify if they protect the business, such as professional indemnity, public liability or business equipment cover. Private medical insurance, personal life insurance and ordinary personal financial planning are different matters and are not normally business deductions merely because you work in medicine.

A separate business bank account is not compulsory for a sole trader, but it makes record-keeping considerably easier. It reduces the risk of losing receipts, missing income or mixing personal spending with professional costs. For a limited company, keeping company money separate is essential.

Expenses that often cause problems

Some costs are regularly overclaimed because they feel work-related. Everyday clothing is the classic example. Suits, shoes and general smart clothing are usually not deductible, even if you wear them only for shifts. Uniforms and protective clothing may be different where they are distinctive, protective or required for the role.

Food and drink are another grey area. Buying lunch during a normal shift is a personal cost. Subsistence can be allowable where you are travelling on qualifying business and incur additional costs because you are away from your normal base. The circumstances, rather than the receipt, determine the claim.

Childcare, gym memberships, home broadband and professional grooming costs are usually personal, even where they help you remain available, presentable or productive. It can be tempting to treat them as business costs, but a claim that cannot be justified can create problems if HMRC asks questions later.

Keep records while the detail is fresh

Good tax outcomes are built month by month, not in the week before a Self Assessment deadline. Save digital copies of receipts, invoices, mileage records, agency statements and bank transactions as you go. Add a short note explaining the business purpose where it is not obvious from the document.

For each assignment, record the engager, dates worked, payment basis and whether you were paid under PAYE or invoiced independently. This is particularly useful for locums with multiple practices and agencies, where income can otherwise be difficult to reconcile.

You should normally keep records for at least five years after the 31 January filing deadline for the relevant tax year. If you trade through a limited company, company records have their own retention requirements. A simple, consistent system is usually more valuable than an elaborate spreadsheet that is abandoned after two months.

Plan for tax before it becomes a pressure point

Allowable expenses reduce taxable profit, but they do not make an expense free. Spending £1,000 simply to save tax is rarely a good commercial decision. The better objective is to claim legitimate costs, maintain clear financial visibility and set aside money for income tax and National Insurance as you earn.

This is especially important when locum income fluctuates. A strong run of shifts can create a tax bill that arrives long after the money has been spent. Regular bookkeeping helps you see your likely position early, assess whether payments on account apply and make decisions with confidence.

For locums, the most useful tax strategy is usually not a clever last-minute claim. It is a clear record of how you work, a sensible approach to expenses and advice that reflects your actual contracts rather than assumptions. AccountingIN can help turn that routine financial discipline into more control over your income and less time spent worrying about compliance.