How Do Locum Pharmacists Pay Tax in the UK? A Beginner’s Guide

The move to becoming a locum pharmacist is an exciting one. It offers unparalleled flexibility, varied work environments, and often, a higher rate of pay. However, with this freedom comes a new responsibility: managing your own finances and, crucially, your own taxes.

For anyone used to the simplicity of PAYE (Pay As You Earn) in a permanent role, the world of self-employment tax can feel daunting. But it doesn't have to be. This guide will demystify the process, breaking down what you need to know to handle your taxes confidently and correctly.

The First Big Decision: Your Business Structure

Before you can think about paying tax, you need to decide how you will operate. For most locum pharmacists in the UK, there are two main choices:

1. Sole Trader

This is the simplest and most common way to start. As a sole trader, you and your business are legally the same entity.

• Pros:

  • Easy to set up: You just need to register with HM Revenue & Customs (HMRC) for Self Assessment.

  • Minimal administration: Less paperwork and lower accountancy fees compared to a limited company.

  • Full control: You keep all the profits after tax.

• Cons:

  • Unlimited liability: If the business incurs debts, your personal assets (like your home or car) could be at risk. This is a low risk for most locum pharmacists.

  • Potentially less tax-efficient: At very high income levels, you may pay more tax than you would through a limited company.

    
    

2. Limited Company

Setting up a Private Limited Company (Ltd) means you create a separate legal entity. You are the owner and director of the company, and the company invoices for your work. You then pay yourself a salary and/or dividends.

• Pros:

  • Limited liability: Your personal assets are protected from business debts.

  • Tax efficiency: Can be more tax-efficient for higher earners through a combination of a small salary and dividends.

  • Professional perception: Some believe it appears more professional.

• Cons:

  • More complex: Requires registration with Companies House and HMRC.

  • Increased administration: You must file annual accounts, a confirmation statement, and a company tax return.

  • Higher costs: Accountancy fees are significantly higher.

Which is right for you? Most locums starting out choose the sole trader route for its simplicity. As your income grows consistently, it may be worth speaking to an accountant about the potential tax savings of switching to a limited company.

The Key Taxes You'll Encounter (as a Sole Trader)

If you operate as a sole trader, you will pay tax on your profits (your total income minus your allowable business expenses). This is done through a system called Self Assessment. The main taxes are:

1. Income Tax

This is the main tax on your profits. You get a Personal Allowance, which is the amount you can earn tax-free each year (for 2025/26, this is expected to be around the $£12,570 mark, but always check the current rate). Any profit above this is taxed at different bands:

• Basic Rate: 20%

• Higher Rate: 40%

• Additional Rate: 45%

(Note: These bands and rates apply to England, Wales, and Northern Ireland. Scotland has its own Income Tax bands).

2. National Insurance Contributions (NICs)

As a self-employed individual, you pay two types of National Insurance:

• Class 2 NICs: A flat weekly rate (e.g., $£3.45 per week). This contribution entitles you to state benefits, including the State Pension. You don't pay this if your profits are below the 'Small Profits Threshold'.

• Class 4 NICs: A percentage of your annual profits. You pay a rate on profits between a lower and an upper threshold (e.g., 9% on profits between $£12,570 and $£50,270), and a different rate on profits above that (e.g., 2%).

Your Step-by-Step Tax To-Do List

Step 1: Register with HMRC

As soon as you start working as a locum, you must register for Self Assessment. You must do this by 5th October after the end of the tax year in which you started trading. A tax year runs from 6th April to 5th April.

• Example: If you start locuming in June 2025 (which is in the 2025/26 tax year), you must register by 5th October 2026.

• You can register easily online on the GOV.UK website.

Step 2: Keep Meticulous Records

This is the golden rule of self-employment. From day one, track every penny in and every penny out.

• Income: Keep copies of all invoices you issue and a log of all payments you receive.

• Expenses: Keep receipts for every single business expense you claim.

Using accounting software like FreeAgent, Xero, or QuickBooks, or even a well-organised spreadsheet, is essential.

Step 3: Understand Your Allowable Expenses

You can deduct allowable business expenses from your income to reduce your profit, and therefore your tax bill. Common expenses for a locum pharmacist include:

• Professional Fees: GPhC registration, Royal Pharmaceutical Society (RPS) membership.

• Insurance: Professional indemnity insurance.

• Travel: Mileage for travel to temporary workplaces (but not to a regular, recurring workplace). You can claim a flat rate per mile (e.g., 45p for the first 10,000 miles).

• Equipment: A new laptop, scrubs, a fob watch, or specific stationery used for work.

• Training: Costs for courses and CPD (Continuing Professional Development).

• Accountancy Fees: The cost of hiring an accountant to do your tax return is tax-deductible.

• Use of Home as Office: A simplified flat rate or a calculated portion of your household bills (like electricity, gas, internet).

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Step 4: File Your Self Assessment Tax Return

Each year, you must report your income and expenses to HMRC by filing a Self Assessment tax return.

Key Deadlines:

• Tax Year: 6th April to 5th April.

• Online Filing Deadline: 31st January the following year.

• Tax Payment Deadline: 31st January the following year.

Example: For the 2025/26 tax year (ending 5th April 2026), your filing and payment deadline is 31st January 2027.

A Note on Payments on Account: If your tax bill is over $£1,000, HMRC will ask you to make advance payments towards your next year's tax bill. These are called 'Payments on Account' and are due on 31st January and 31st July. This often catches new locums by surprise, so be prepared!

Top Tips for a Stress-Free Tax Life

1. Open a Separate Business Bank Account: This is the single best thing you can do. It keeps your business and personal finances separate, making record-keeping a breeze.

2. Set Money Aside for Tax: Every time you get paid, transfer 25-30% of the invoice value into a separate savings account. This ensures you have the money ready when the tax bill arrives. Do not touch this money!

3. Consider an Accountant: While you can do it yourself, a good accountant who specialises in locums or contractors can save you time, stress, and potentially more money than their fee costs by identifying all allowable expenses.

4. Go Digital: Use accounting software to track income, log expenses on the go by snapping photos of receipts, and make filing your tax return much simpler.

Managing your taxes is a core part of being a successful locum pharmacist. By getting organised from the start and understanding your obligations, you can enjoy the benefits of locum work without the financial anxiety.

Disclaimer: This article is intended for informational purposes only and constitutes general guidance. Tax laws and regulations are subject to change. You should always consult with a qualified accountant or tax advisor for advice tailored to your specific circumstances.