Working as a locum doctor in the UK brings unique tax challenges that permanent NHS staff never face. This locum doctor tax complete guide covers everything from IR35 compliance to expense claims, helping you navigate the complex tax rules that apply to medical professionals working on a contract basis.

Whether you're a newly qualified doctor considering locum work or an experienced locum looking to optimise your tax position, understanding these rules is essential for both compliance and maximising your take-home pay.

Employment Structures for Locum Doctors

Locum doctors typically work through one of three structures, each with different tax implications.

Direct Employment (Bank/Agency Staff)

When working through NHS staff banks or recruitment agencies as an employee, tax is straightforward. The bank or agency operates PAYE, deducting income tax and National Insurance from your gross pay.

You receive a P60 at year-end and can claim limited expenses through your self-assessment return. However, you miss out on the potential tax benefits of contracting.

Sole Trader/Self-Employment

Some locum doctors work as sole traders, invoicing clients directly. This structure works for those genuinely outside IR35, but carries unlimited personal liability.

You pay income tax and Class 2/Class 4 National Insurance on profits, with Class 4 NI capped at £4,189 for 2025/26. The simplicity makes this attractive for lower-earning locums or those just starting out.

Limited Company Structure

Most established locum doctors use a limited company for contracting. This offers the greatest tax efficiency when outside IR35, but requires more administration.

You take a small salary (typically £12,570 to maximise NI efficiency) and extract remaining profits as dividends. This can save significant tax compared to employment, particularly for higher earners.

Tax Planning Strategies

Effective tax planning can significantly impact your net income as a locum doctor. Here are key strategies to consider.

Pension Contributions

Pension contributions remain one of the most effective ways to reduce your tax bill. You can contribute up to 100% of relevant earnings or £60,000 annually (2025/26), whichever is lower.

Locum doctors often miss out on NHS pension benefits, making personal pension planning even more critical. Consider whether to maintain voluntary NHS pension contributions or invest in private arrangements.

Timing of Income

If using a limited company, you have flexibility over when to extract profits. Consider:

  • Deferring dividends to manage tax brackets
  • Accelerating income before tax rate changes
  • Spreading income across family members (where appropriate)
  • Using dividend allowances efficiently

Expense Timing

Time allowable expenses to maximise tax relief. For example, pay annual subscriptions and equipment purchases before your accounting year-end to claim relief in the current year.

Record Keeping Requirements

Proper record keeping is essential for locum doctors, both for tax compliance and to support expense claims.

Essential Records to Maintain

  • All invoices and contracts
  • Bank statements and payment records
  • Expense receipts and documentation
  • Mileage logs with business journey details
  • Professional qualification certificates
  • Insurance documents

Digital Record Keeping

From April 2026, Making Tax Digital rules will likely extend to more businesses. Start using cloud-based accounting software now to stay ahead of requirements and simplify your bookkeeping.

Popular options for medical professionals include Xero, QuickBooks, and FreeAgent. These integrate with banking and can automatically categorise common medical expenses.

Getting Professional Help

The complexity of locum doctor taxation often justifies professional assistance. A specialist medical accountant can help you:

  • Structure your affairs tax-efficiently
  • Navigate IR35 determinations
  • Maximise allowable expense claims
  • Plan for major purchases or career changes
  • Handle HMRC enquiries if they arise
- Locum Doctor Expenses: What You Can Claim - Locum Doctor Self Assessment Filing Guide - NHS Pension for Locums: Form A and Form B Guide

This locum doctor tax complete guide covers the essentials, but every locum's situation is unique. Consider seeking advice from accountants who specialise in working with medical professionals and understand the specific challenges you face.

For personalised guidance on your locum doctor tax situation, speak to our specialist medical accountants who work exclusively with UK healthcare professionals.