The tax mistakes doctors and dentists make can quietly cost thousands in extra tax. This is especially true in the UK system, where you might have a mix of NHS, private, locum and practice income all at once.
Below is a detailed guide to the main tax mistakes doctors and dentists make in the UK and what to do instead. The focus is on helping you stay compliant, keep more of what you earn and avoid HMRC headaches.
This guide is for:
- NHS doctors with extra private or locum income
- GPs, consultants and hospital doctors
- Self-employed or associate dentists
- Practice owners, partners and those thinking of setting up a limited company
Tax Mistakes Doctors and Dentists Make
Here are some of the most common tax mistakes doctors and dentists make, and practical tips to help you avoid them.
Mistake 1: Not Claiming All Possible Tax Deductions
A very common tax mistake doctors and dentists make involves failing to claim for every professional out-of-pocket cost you incur. Many doctors and dentists assume they cannot claim much back because they are on an NHS PAYE contract. This is simply not true. If you are paying for items essential to your job, you are likely entitled to tax relief for them.
We often see clinicians who have gone years without claiming their professional memberships. Over a decade, this can add up to a staggering sum. You have essentially gifted this money to the government. Even the smaller recurring costs count toward lowering your overall tax bill.
To avoid these tax mistakes doctors and dentists make, you should:
- Keep a rolling list of all mandatory fees like GMC, GDC, and Royal College subscriptions.
- Record your professional indemnity insurance payments to the MDU, MPS, or MDDUS.
- Track costs for stethoscopes, surgical loupes, and even the laundry of your clinical scrubs.
- Claim for your BMA or BDA memberships and any journals required for your CPD.
- Review your expenses at the end of the year to ensure you have claimed everything you’re entitled to.
- Consult with a tax professional who specialises in healthcare to ensure you don’t miss any opportunities.
Mistake 2: Getting Caught in the 60% Tax Trap
The 60% tax trap is a frustrating quirk of the UK tax system. It catches many GPs, consultants, and successful dentists every year. Most individuals believe that the highest level of tax to be paid is 45%.
However, if you are earning income between £100,000 and £125,140, you will have your personal allowance withdrawn. As you exceed the £100k threshold for each £2 you earn, you will lose one pound of your tax-free allowance.
This is one of the most painful tax mistakes doctors and dentists make because it effectively means you are paying 60% tax in that specific earning bracket. This often happens to healthcare professionals who take on extra shifts or waiting list initiatives. It can also happen when private patient numbers increase.
To avoid these tax mistakes doctors and dentists make, you should:
- Monitor your “adjusted net income” closely as you approach the £100,000 threshold.
- Consider making a targeted pension contribution to pull your taxable income back below the trap zone.
- Look into using Gift Aid for any charitable donations to help lower your adjusted income.
- Review your salary sacrifice options, such as electric car schemes, to reduce your taxable pay.
Mistake 3: Miscalculating the NHS Pension Annual Allowance
The NHS pension is one of the best in the country. However, the tax rules behind it are notoriously complex. A common trap for doctors and dentists is exceeding the Annual Allowance without realising it.
For the 2025/26 tax year, the standard allowance is £60,000. This limit can ‘taper’ down for high earners. This reduction usually happens if your “threshold income” is over £200,000 and your “adjusted income” (which includes your pension growth) exceeds £260,000. In these cases, your limit could drop as low as £10,000.
The tricky part is that the allowance is not based on what you pay in. Instead, it is based on how much the value of your pension grows. For instance, a promotion or a pay rise can cause your pension value to jump. This growth can trigger a tax bill that reaches into the tens of thousands of pounds.
To avoid these tax mistakes doctors and dentists make, you should:
- Request your “Pension Savings Statement” from NHS Pensions every year to see your actual growth.
- Work with a specialist who can calculate your tapered allowance based on all your income sources.
- Check if “Scheme Pays” is a viable option for you to handle any large tax charges.
- Be cautious before taking on extra roles that might push your pension growth over your limit.
Mistake 4: Not Getting Ready for Making Tax Digital (MTD)
By April 2026, the way you report your income is changing for good. HMRC is moving away from the old annual tax return for many people. If your gross turnover from self-employment or property is more than £50,000, you will be required to comply with Making Tax Digital starting from 6 April 2026.
This is a major entry in the list of tax mistakes doctors and dentists make. Many are still using manual spreadsheets or paper records. Under MTD, self-employed individuals and landlords must keep digital records and send quarterly updates to HMRC. Sticking with the old ways will lead to automatic points-based penalties and a lot of stress.
Note: These specific rules do not yet apply to income earned through a limited company
To avoid these tax mistakes doctors and dentists make, you should:
- Switch to digital accounting software like Xero or QuickBooks that is compatible with HMRC.
- Start categorising your income and expenses digitally now to make it a habit.
- Link your business bank account to your software to automate the tracking of transactions.
- Ensure your accountant has “real-time” access to your data to flag issues early.
Mistake 5: Choosing an Inefficient Business Structure
Many dentists and doctors set up a limited company because they heard it was the most tax-efficient move. While it can be great for some, it is not a one-size-fits-all solution. The tax-free Dividend Allowance has been reduced to just £500, and dividend tax rates remain high. This narrows the benefit of being a company director.
If you are a locum, you need to be aware of the Off-Payroll Working rules. For most NHS and large private roles, the hospital or your agency is now responsible for deciding your tax status and paying any underpaid tax to HMRC.
However, if you work for a small private clinic, your own company is still responsible for getting your tax status right. Because of this, you could still be held liable for back-dated tax and National Insurance if the setup is incorrect. This is one of the most expensive tax mistakes doctors and dentists make. It often stems from getting bad advice when first starting in private work.
To avoid these tax mistakes doctors and dentists make, you should:
- Conduct a yearly “incorporation review” to see if a limited company still saves you money.
- Ensure all locum contracts are reviewed for IR35 compliance before you sign them.
- Maintain a clear separation between your personal money and your business money.
- Calculate the total cost of running a company, including filing requirements, against the tax savings.
Mistake 6: VAT Confusion on Cosmetic and Aesthetic Work
This is a specific trap for dentists and doctors moving into facial aesthetics or cosmetic treatments. Standard healthcare is VAT-exempt because it is “therapeutic.” However, HMRC views purely cosmetic work differently. If a procedure is not intended to treat a medical condition, it is usually taxable.
When looking at tax mistakes doctors and dentists make, failing to monitor the VAT threshold is a significant one. If your taxable turnover from cosmetic services exceeds the £90,000 threshold (current for 2025/26) on a rolling 12-month basis, you must register for VAT.
We have seen cases where HMRC back-dates a tax bill for several years. This happens because a practitioner didn’t realise their aesthetic work was taxable. It can be a devastating blow to a successful practice.
To avoid these tax mistakes doctors and dentists make, you should:
- Keep a separate tally of your “cosmetic” income versus your “therapeutic” or NHS income.
- Consult with a specialist to determine which of your specific treatments are taxable.
- Monitor your rolling 12-month turnover for cosmetic work to stay below the £90k limit.
- Register for VAT as soon as you know you will hit the threshold to avoid late penalties.
How Should I Track My Income and Expenses to Avoid Tax Problems?
To avoid common tax mistakes doctors and dentists make, it helps to separate business and personal bank accounts and keep digital records as you go.
Using simple accounting software or an app to record income, scan receipts and log mileage makes it much easier to complete your tax return accurately. This also reduces the risk of lost receipts, guessed figures and HMRC queries later on.
Do I Really Need to File a Tax Return if I Only Work for the NHS?
Generally, if your only income is from an NHS salary and it is taxed through PAYE, you might not need to file. However, one of the hidden tax mistakes doctors and dentists make is assuming this is always the case.
While you are no longer required to file just for earning over £150,000, you must file a Self Assessment if you have:
- Untaxed income over £1,000 from private work (self-employment) or rental properties.
- The highest earner in the household has an income over £60,000, and you or your partner claims Child Benefit
- Other taxable income, such as dividends over £500 or savings interest over £10,000.
How Do I Know if I Am Stuck in the ‘60% Tax Trap’?
You fall into this trap if your “adjusted net income” is between £100,000 and £125,140. At this level, HMRC removes £1 of your personal allowance for every £2 you earn. This creates an effective 60% tax rate on that slice of your income.
It is one of the most expensive tax mistakes doctors and dentists make if they don’t use pension contributions to bring their income back below the £100k mark.
Can I Claim for My Stethoscope and Other Clinical Equipment?
Yes, you definitely can. Any equipment you buy that is necessary for your role is usually tax-deductible. This includes smaller items like stethoscopes or blood pressure cuffs. And also larger items for dental practices, like X-ray machines or dental chairs.
These items fall under capital allowances (practice owners). For practice owners operating as a limited company, ‘Full Expensing’ allows you to deduct the entire cost of qualifying equipment, like dental chairs, from your profits in the year you buy them. Failing to claim for these is a common tax mistakes doctors and dentists make.
What Happens if HMRC Checks My Tax Return and Finds Mistakes?
If HMRC finds errors, they can ask for extra tax, charge interest and sometimes add penalties, especially if they think you were careless.
Many of the tax mistakes doctors and dentists make are unintentional. However, HMRC still expects you to take “reasonable care” with your return.
Maintaining clear records of income and expenses and seeking professional assistance prior to completing a tax return will reduce the risk and the level of any penalties.
Why Is My Tax Bill So Much Higher Than My Colleague’s?
Tax is very personal. Even though both you and your colleague may be making the same salary, there are many reasons why your tax bill may be higher than theirs. One of those reasons may be the amount of money you’ve made in the past couple of years through pension growth. Another reason may be that you don’t have as many deductible expenses as your colleague.
Another reason is the “Payments on Account” system. Furthermore, there may be some tax mistakes doctors and dentists make. So, if this is your first year of significant self-employment, you have to pay the tax for the previous year, plus half of the current year, at the same time. This ‘150%’ bill is a common shock for doctors. It happens because you must pay the remaining tax for the previous year, plus a 50% ‘payment on account’ toward the following year, all at once.
Can an Accountant Really Save Me Money if I Already Do My Own Tax Return?
Often, yes. Many tax mistakes doctors and dentists make are invisible until someone who knows medical tax looks at the whole picture across NHS, private, and locum income.
A healthcare specialist accountant can identify missed allowances and rectify any poor or risky expense claim strategies. An accountant can also assist with planning for your own business in relation to the 60% band and other pension-related areas.
The cost of these savings often exceeds the cost of the accounting fees.
The Bottom Line
When you look at it closely, the tax mistakes doctors and dentists make usually come down to two things. You have a lack of time and a tax system that is far too complicated.
Between the 60% trap and the shift to Making Tax Digital in 2026, it is easy to feel overwhelmed. The best approach is to keep your records digital and make sure you are claiming every penny you are legally allowed to.
If you need expert help managing these mistakes, CruseBurke is here to assist you.
From NHS pension charges to private practice expenses, there’s a lot that general accountants miss. See exactly what we can save you — get a quote and find out in minutes.
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, or year-end accounts, reach out to us today. We’d love to have a talk about how we can make your life easier and your practice more profitable!
Disclaimer: All the information provided in this article on “Common Tax Mistakes Doctors and Dentists Make” including all the texts and graphics, is general in nature. It does not intend to disregard any of the professional advice.
