How Locum Doctors Should Manage Taxes in the UK

Working as a locum doctor gives you flexibility and often higher pay compared to permanent NHS roles. But with that freedom comes responsibility. One of the biggest challenges is how locum doctors manage their taxes.

Unlike salaried employees, you don’t have tax deducted automatically through PAYE. Instead, you need to take charge of your own tax affairs.

This article will walk you through the strategies that locum doctors should follow to manage their taxes effectively.

Let’s break it down!

How Locum Doctors Should Manage Their Taxes

Here are 10 essential strategies to help locum doctors manage their taxes efficiently and avoid costly penalties.

Strategy 1: Pick the Right Structure for Your Work

The first big decision that affects how locum doctors manage their taxes is how they operate. Most locums fall into one of these categories, and picking the right one is your first big decision.

1. Sole Trader (Self-Employed):
You invoice hospitals or GP practices in your own name. You’ll file a Self Assessment return once a year and pay Income Tax and Class 4 National Insurance on your profits.

It’s the simplest way to start and gives you the most control over your pension.

2. Employed via Agency or Practice (PAYE):
The “hands-off” approach. The agency treats you like an employee. Hence, it deducts tax and National Insurance before the money hits your account.

It’s low-admin. But you have fewer opportunities to claim back professional expenses.

3. Umbrella Company:
The umbrella company acts as an intermediary. They collect your pay, take a fee, and then pay you a net salary after taxes.

It’s common for short-term agency roles. But be aware that you often end up covering the cost of Employer National Insurance out of your day rate. Also, be aware that this rose to 15% in 2025, and the threshold was lowered to £5,000. This means more of your pay is now subject to this tax.

4. Limited Company:
You set up a separate legal entity. You pay yourself a small salary and take the rest in dividends. This can be tax-efficient if you earn over £60k.

However, you must watch out for IR35. If HMRC decides your “company” is just a cover for a normal job, they will tax you at the full employment rate anyway.

Strategy 2: Register Correctly and Understand When You Must File

A basic part of how locum doctors manage their taxes is simply registering in the right way and on time. If your locum work is as a sole trader and your gross income is more than £1,000 in a tax year, you must register for Self Assessment with HMRC.

 Key Filing Deadlines:

• 31 October: Deadline for submitting a paper tax return.
• 31 January: Deadline for submitting your return online and paying your full tax bill.

If you have a salaried NHS post and your gross locum income (before expenses) exceeds £1,000 in a tax year, you must file a Self Assessment return to declare all your income in one place.

Simply getting on top of these dates is a key part of how locum doctors manage their taxes sensibly.

Strategy 3: Learn the Tax and NI Bands That Affect You

To help locum doctors manage their taxes, you need to know how the “banded” system works. The more you earn, the higher the percentage HMRC takes from that “top slice” of your income.

Income Tax Rates (2026/27):

• Personal Allowance: Up to £12,570 (Tax-free).
• Basic Rate (20%): £12,571 to £50,270.
• Higher Rate (40%): £50,271 to £125,140.
• Additional Rate (45%): Above £125,140.

Note: Your Personal Allowance is gradually withdrawn once your income exceeds £100,000.

National Insurance (NI) for the Self-Employed:

• Class 2: Mandatory payments are abolished for most. However, if your profits are below £7,105, you can still choose to pay this voluntarily at a rate of £3.65 a week to protect your State Pension record.
• Class 4: This is 6% on profits between £12,570 and £50,270, and 2% on anything above that.

Because these layers add up quickly, most advisors suggest that locum doctors manage their taxes by putting aside 30% to 35% of every invoice into a separate savings account. By doing so, they won’t be caught short in January.

Strategy 4: Use a Clear System for Records and Bank Accounts

Good bookkeeping is one of the easiest ways for locum doctors to manage their taxes without stress. It saves time and also ensures you do not miss out on deductions that lower your bill.

• Open a separate bank account: Even as a sole trader, you should keep your locum income away from your personal spending. If you mix your NHS salary with locum payments, it will be difficult to track your true profit.
• Log every invoice and payment: Use a basic spreadsheet or software to track your work. Record the location, the amount invoiced, and also the date the money hit your account.
• Store digital receipts: Keep copies of every work-related receipt in a cloud folder. This is important when you calculate which costs can reduce your taxable profit at the end of the year.

By turning these actions into a weekly habit, you will find that the admin side of how locum doctors manage their taxes becomes much more manageable.

Strategy 5: Know Which Expenses You Can Claim

A massive part of how locum doctors manage their taxes is making sure they aren’t paying tax on money they’ve already spent on their career (allowable expenses). You only pay tax on your profit, so you must deduct your costs.

• Professional Fees: Your GMC, BMA, and MDU/MPS subscriptions are all deductible.
• Training and CPD: As long as it is related to your current role, the course fees and travel to get there count.
• Equipment: From that new stethoscope to the laptop you use for admin.
• Home Office: If you do your paperwork at home, you may claim a portion of your utility bills.
• Mileage: Keep a log of every mile driven to a temporary hospital or surgery. It adds up to thousands over a year. You can usually claim for travel to various hospitals or surgeries if they aren’t your permanent place of work.

Strategy 6: Plan for Payments on Account and Cash Flow

One thing that catches many people out is payments on account. This is a major part of how locum doctors manage their taxes as their income grows. HMRC uses this system to collect tax in instalments towards your current year’s tax bill.

These payments are split into two equal instalments:

• 31 January: Due at the same time as your balancing payment for the previous year.
• 31 July: Due six months later.

The first year your tax bill exceeds £1,000 can be a shock. On 31 January, you must pay 100% of your bill for the previous year plus a 50% advance payment for the current year. This means your first January bill can be 150% of what you expected.

This is why many advisers recommend that locum doctors manage their taxes by moving 30% to 35% of every single invoice into a separate savings account immediately.

Strategy 7: Be Aware of IR35 and Disguised Employment

If you work through a limited company or an agency, you will hear the term IR35 often. It is a central part of how locum doctors manage their taxes when using company structures. This legislation targets contractors who work like employees but use a company to pay less tax.

For most locums, the key points are:

• Trust Responsibility: Since 2017 for the NHS, and 2021 for medium and large private clinics, the hiring organisation is responsible for deciding your IR35 status.
• Inside IR35: If you are found to be inside, your income is taxed like a normal salary with PAYE and National Insurance deducted. This removes most tax benefits of having a company.
• Private Providers: Smaller private practices may still leave the IR35 decision to you, so you must assess your own status carefully.
• Risk Factors: HMRC looks at how much control the clinic has over you and whether you can send a substitute to do your work. If your day looks exactly like a salaried doctor’s role, you are likely inside IR35.

Strategy 8: Remember VAT Rules

VAT is usually not a concern for the vast majority of locums because most core medical services are VAT-exempt. However, it becomes a factor if you branch out into non-clinical work or hit a high income threshold.

• Clinical Work is Exempt: Shifts for direct patient care (GP sessions, A&E, ward cover) are VAT-exempt. This means you don’t charge VAT on your invoices, even if you are a high earner.
• The £90,000 Threshold: You only need to register for VAT if your taxable income (not your total income) exceeds £90,000 in a rolling 12-month period. Since clinical work is exempt, it doesn’t count towards this specific threshold.
• What counts as “Taxable”: Non-clinical work like medico-legal reports, expert witness testimony, or management consultancy is taxable at 20%. If you do a lot of this “private” work, you must keep a close eye on that £90,000 limit.
• Agency & Limited Company Update: Historically, HMRC tried to argue that locums supplied via agencies should be charged VAT (20%). However, following a major court ruling in 2025, HMRC now accepts that supplying locum doctors to fill medical roles is also VAT-exempt, even when provided via an agency.

In short: Unless you are doing over £90,000 worth of legal reports or consultancy a year, you generally don’t need to worry about VAT.

Strategy 9: Use Software and Professional Support

The move towards Making Tax Digital means that using the right tools is now a standard part of how locum doctors manage their taxes. Relying on paper receipts is no longer enough for a modern medical career.

• Accounting Software: Systems like Xero or QuickBooks can link directly to your bank account. They track your invoices and store your receipts digitally, which makes tax season much faster.
• Medical Accountants: A specialist who understands the NHS can be a lifesaver. They can help you choose the right structure, check your IR35 status, and ensure you claim every relief you are entitled to.

Working with a firm that knows the healthcare world means you won’t have to explain the difference between a GP session and a hospital bank shift. Professional support is often the best investment you can make to ensure you stay compliant.

Strategy 10: Understand Making Tax Digital and Quarterly Updates

A major change currently rolling out affects how locum doctors manage their taxes through the Making Tax Digital (MTD) initiative. This is a shift away from the traditional once-a-year tax return towards a more frequent, digital relationship with HMRC.

From April 2026, MTD applies to those earning over £50,000. From April 2027, this threshold drops to £30,000. Hence, it will bring the vast majority of locum doctors into the quarterly reporting net.

For locum doctors to manage their taxes under these new rules, the requirements include:

• Digital record keeping: You must use MTD-compatible software rather than paper logs or simple spreadsheets.
• Quarterly submissions: You will send four digital updates each year to HMRC instead of waiting for the January deadline.
• Year-end declaration: You still need to submit a final declaration after the tax year finishes to confirm your total income.

While this sounds like more admin, much of the process can be automated if you already use accounting software. These changes encourage locum doctors to manage their taxes in real time. By seeing your profit levels throughout the year, you can more accurately calculate how much to set aside for your tax bill.

Can I Still Contribute to the NHS Pension as a Locum?

Yes, if you work for a Hospital Bank: You are a PAYE employee, and it happens automatically.

Yes, if you are a GP Locum (Sole Trader): But only if you submit Forms A and B within the 10-week deadline and only on 90% of your pay.

No, if you work via a Limited Company or Private Agency: This is generally considered non-pensionable private work.

What Happens if I Miss a Quarterly Digital Update?

HMRC has a points-based penalty system now. Missing one might just be a warning, but repeat offenders will see fines added to their tax bill. Therefore, it’s better to set reminders well in advance.

Is VAT a Concern for Locums?

No, usually not. Most locum work is VAT-exempt because it involves direct patient care. You only need to register for VAT if your non-clinical income (like legal reports, teaching, or consultancy) exceeds £90,000 a year.

Clinical shifts don’t count towards this limit. And thanks to recent rule changes, work through agencies is now generally exempt, too.

Can I Still Use an Umbrella Company?

Yes, many agencies will push you towards an umbrella company. It makes your tax simple because they do it for you (PAYE). But you’ll often find you’re paying more in National Insurance than you would elsewhere.

What Is the Tax-Free Personal Allowance for 2026/27?

The personal allowance remains frozen at £12,570. If you earn over £100,000, this allowance starts to taper away. This can lead to an effective tax rate of 60% on the income between £100,000 and £125,140.

How Much Should I Set Aside for Tax?

As specialist accountants for healthcare, we recommend setting aside 30% to 35% of every invoice into a separate savings account. This covers your Income Tax, National Insurance, and the “Payments on Account” for the following year.

The Bottom Line

The locum doctors’ management of their taxes in the UK comes down to understanding the rules and planning.

If you track every expense and set aside a third of your income for HMRC, you will avoid the January panic that many of your colleagues face.

If you need an expert healthcare accountant, CruseBurke is here to assist you.

How CruseBurke Can Help

At CruseBurke, we’ve made it our mission to protect the finances of those who spend their lives protecting others. Our team of specialist healthcare accountants understands the complexities of healthcare finances.

If you need help with any accounting service, such as bookkeeping, payroll, year-end accounts, or NHS Pension schemes, reach out to us today. We’d love to discuss how we can make your life easier and your practice more profitable!

Disclaimer: All the information provided in this article on “How Locum Doctors Should Manage Taxes in the UK
” including all the texts and graphics, is general in nature. It does not intend to disregard any of the professional advice.