Making Tax Digital (MTD) has changed how UK dentists keep records and report to HMRC, and for most individual dentists the part that matters now is MTD for Income Tax, not MTD for VAT. The income tax regime is live from 6 April 2026 and catches the majority of full-time associates and unincorporated practice owners. This guide separates the two regimes, explains who is caught, and sets out the digital records, quarterly updates, software and penalties you need to plan for.
The headline for most dentists is simple. If you are a sole trader and your qualifying income is over £50,000, you are in MTD for Income Tax from 6 April 2026. MTD for VAT, by contrast, only reaches practices that are VAT-registered, and because most clinical dental income is VAT-exempt, many purely clinical practices never cross the VAT threshold at all.
Two different regimes: do not confuse them
People often talk about "MTD" as one thing. In reality there are two separate rule sets, and they apply to different taxpayers on different timelines.
- MTD for VAT. Applies to VAT-registered businesses. It governs how VAT records are kept and how VAT returns are filed.
- MTD for Income Tax. Applies to individual sole traders and landlords by level of income. It governs digital records, quarterly updates and end-of-year finalisation for income tax.
The legal framework for MTD for Income Tax sits in Finance (No. 2) Act 2017 and the Income Tax (Digital Requirements) Regulations 2021 (SI 2021/1076) as amended. Limited companies are outside MTD for Income Tax, because it is an income tax regime and not corporation tax. If your practice trades through a company, your corporation tax filing is unaffected by these rules.
Why the VAT piece is smaller than it looks for dentists
The supply of dental care and dental prostheses by a person on the dentists' register or the dental care professionals register is exempt from VAT under Schedule 9 Group 7 of the VAT Act 1994. That exemption applies whether the treatment is NHS-funded or private, provided the principal purpose is protecting, maintaining or restoring health.
This matters for MTD because of how the VAT threshold works. The threshold is £90,000 of taxable turnover, and exempt income does not count towards it. A practice doing only clinical work can therefore have a large turnover and still have no obligation to register for VAT. No VAT registration means no MTD for VAT.
The exception is cosmetic or aesthetic work with no therapeutic purpose, which is standard-rated. Tooth whitening for appearance, and facial aesthetics such as Botox or fillers for cosmetic reasons, are the classic items HMRC scrutinises. A practice with enough standard-rated turnover can cross the £90,000 threshold, register for VAT, and then fall into MTD for VAT and partial exemption. For the detail on when registration is triggered, see our guide to the dental practice VAT registration threshold and requirements. The takeaway here is that, for the typical dentist, the VAT regime is a niche concern and the income tax regime is the main event.
MTD for Income Tax: who is caught and when
MTD for Income Tax applies to sole traders and landlords by qualifying income, which is gross trading income plus gross property income. The thresholds phase in over three years:
| From | Qualifying income over | Typical dentist affected |
|---|---|---|
| 6 April 2026 | £50,000 | Most full-time associates and unincorporated principals |
| 6 April 2027 | £30,000 | Part-time associates and smaller sole-trader income |
| 6 April 2028 | £20,000 | Lower-income sole traders and many with modest property income |
The key point for dentists is that qualifying income is measured on gross income, before expenses. A busy associate can be over £50,000 of fee income even after lab fees, materials and other costs come out. HMRC tests this figure on your prior Self Assessment return, so your 2024/25 return determines whether you are in from 6 April 2026.
Because the bar is gross income and is set at £50,000, the practical reality is that most full-time associates and most unincorporated principals are caught from the start of the regime in April 2026. If you are in any doubt about your figure, your prior year return is the document HMRC looks at, so check what it shows.
What MTD for Income Tax actually requires
If you are in scope, three things change.
1. Digital records
You must keep your business income and expenses in a digital form using compatible software. The records must capture each transaction, not just period totals. For a dental sole trader that means your fee income, NHS and private, and your allowable costs such as GDC retention fees, CPD, indemnity, materials and equipment, all recorded digitally as you go.
Spreadsheets are not banned, but they must sit in a digitally linked chain. Data has to flow into your submission software without anyone re-typing totals by hand. A spreadsheet connected to bridging or accounting software by a digital link is fine. Keeping figures on paper and then keying a total into a return is not.
2. Quarterly updates
Instead of one return a year, you send HMRC a summary of income and expenses for each quarter through your software. A quarterly update is a running total, not a polished final figure. It does not need accounting adjustments or reliefs at that stage, so it is closer to a cumulative bookkeeping snapshot than a tax computation. The point of the quarterly rhythm is to keep your records current rather than leaving everything to a January scramble.
3. End-of-year finalisation
After the tax year ends you finalise your position digitally. This is where you bring in your accounting adjustments, claim your allowable expenses in full, account for any other income, and confirm the figures. For affected dentists this digital finalisation replaces the familiar once-a-year Self Assessment return. The expenses you have always claimed do not disappear, they are confirmed at this stage rather than at a single annual filing.
If you want a refresher on the expenses and mechanics that carry over into this new world, our dentist Self Assessment filing guide for 2026 covers CPD, GDC fees, travel and equipment, and our step-by-step guide for dental associates walks through fee-split income and common mistakes.
Compatible software
You need software that appears on HMRC's list of products that work with Making Tax Digital for Income Tax. Two broad options exist. The first is full accounting software that keeps your records and submits updates directly. The second is bridging software that connects an existing spreadsheet to HMRC so the digital link is preserved. The right choice depends on how you already keep records and how much practice bookkeeping you do yourself.
One detail matters for principals: your dental practice management system is not the same as your accounting software. Practice management software handles clinical and patient data, while MTD compliance happens in your accounting layer. If the two do not connect cleanly, you need a workflow that moves the financial data across by a digital link rather than by manual re-entry. Build that bridge before April 2026, not after.
How to prepare before April 2026
The work is not difficult, but it does need a head start because the regime changes your monthly habits rather than just one annual task.
- Check your prior year return. Look at your most recent Self Assessment to see whether your qualifying income is over £50,000. That figure decides whether you are in from 6 April 2026.
- Pick compatible software. Choose a product from HMRC's compatible list that suits how you already work, whether that is full accounting software or bridging software over a spreadsheet.
- Set up digital records early. Start capturing income and expenses digitally before the regime begins, so the first quarter is routine rather than a cold start.
- Establish a digital link for practice data. If you are a principal, make sure financial data moves from your practice systems into your accounting software without manual re-keying.
- Build the quarterly habit. Diarise the quarterly update points and reconcile little and often, rather than waiting for a year-end pile-up.
Penalties
MTD for Income Tax uses HMRC's points-based late submission system. Each late quarterly update or late finalisation earns a point, and once you reach the points threshold a £200 penalty applies. Further failures while at the threshold bring further £200 penalties. Late payment of tax is handled separately, with interest and late payment penalties on the amount owed.
There are also penalties for failing to keep or preserve the required digital records. For a working dentist, the realistic risk is not a single dramatic failure but quietly missing the new quarterly rhythm, so the defence is a software routine that is already running smoothly before the first deadline.
Where this leaves the typical dentist
For most individual dentists, the practical summary is short. MTD for VAT is unlikely to apply, because clinical income is VAT-exempt and exempt income does not count towards the £90,000 threshold. MTD for Income Tax probably does apply, because gross fee income over £50,000 brings you in from 6 April 2026. If you trade through a limited company, neither regime changes your corporation tax filing.
The single most useful step is to confirm your qualifying income from your prior return, choose compatible software, and start keeping digital records now, so the quarterly updates from April 2026 are routine. A specialist dental accountant can confirm which regime catches you, set up a compliant workflow that links your practice and accounting data, and keep your expense claims intact as the annual return gives way to quarterly reporting.