Why a blended practice needs blended reporting
When NHS contract income sits next to private treatment, a single "sales" line on a profit and loss account rarely tells you what is driving the business. The two streams are earned differently, recognised differently, and behave differently. Associates, hygienists, and lab costs move in their own way across each side.
A mixed practice with an even split by turnover can look evenly profitable on the surface. Separate the streams and a different picture often appears. NHS work might contribute the larger share of revenue but a smaller share of profit, while private treatment delivers higher margins with more variability month to month. You cannot see any of that, or act on it, until the income streams are accounted for distinctly.
The two streams are genuinely different in the accounts
The core principle for a mixed practice is simple. NHS contract income and private fee income are not interchangeable lines, and the accounts should treat them as the distinct things they are.
NHS contract income
In England, NHS general dental services are paid by Units of Dental Activity. The practice holds a contract with an annual UDA target and receives smooth monthly payments against it. Crucially, NHS patient charges (the band fees patients pay at the chair) count towards the contract value, they do not sit on top of it. So the contract value is the headline figure, and patient charges are a component of it rather than additional income. NHS income is therefore target-based and subject to a year-end reconciliation, which is the defining feature that sets it apart from private work.
Private fee income
Private income is earned per treatment or per plan: capitation or membership plans, fee-per-item restorative work, hygiene, and direct private treatment. There is no target and no contract reconciliation. Revenue is recognised as the work is done and billed. The pattern is lumpier than the NHS monthly drip, which is exactly why blending the two into one line hides so much.
NHS vs private in the accounts at a glance
| Feature | NHS contract work | Private fee work |
|---|---|---|
| How it is earned | UDA-based against an annual contract target | Per treatment or per plan (capitation, fee-per-item, direct) |
| Payment pattern | Smooth monthly instalments against target | As billed, lumpier month to month |
| Patient charges | Band fees count towards the contract value, not on top of it | The fee is the income in full |
| Year-end adjustment | UDA reconciliation: carry-forward or clawback | None: revenue recognised as performed |
| VAT on clinical care | Exempt (Sch 9 Group 7) | Exempt (Sch 9 Group 7), the same as NHS |
| NHS pension | Pensionable (practitioner, NHS-derived income) | Not NHS-pensionable |
The VAT myth that costs mixed practices money
Here is the misconception we correct most often. Practice owners frequently assume that because their private work is "private", it must be VATable, while only the NHS side is exempt. That is wrong, and acting on it can lead a practice to register for VAT when it has no obligation to, or to mistrust its own pricing.
Both NHS and private clinical dental care are exempt from VAT under Schedule 9 Group 7 of VATA 1994 when supplied by a registered dentist or dental care professional. The exemption turns on the supply being medical care, meaning its principal purpose is protecting, maintaining or restoring health. It does not turn on who funds it. A private crown, a private root canal, a private hygiene appointment: all exempt, on the same footing as the equivalent NHS treatment. The NHS or private split does not create VAT by itself.
What can be standard-rated is purely cosmetic or aesthetic treatment with no therapeutic purpose. Facial aesthetics such as Botox and dermal fillers provided for cosmetic reasons, and elective cosmetic tooth whitening, are the classic watch-items that require a principal-purpose assessment. Only that genuinely taxable income counts towards the 90,000 pound VAT registration threshold. Exempt dental income, NHS or private, does not count towards it at all. So a practice can earn a very large private fee income and still have no VAT registration obligation, provided that income is clinical care rather than cosmetic-only work.
If your practice does carry a meaningful cosmetic line, that is where the real VAT work sits, and it brings partial exemption with it. We set out the detail of the cosmetic boundary and the apportionment rules in our guide to facial aesthetics and VAT for UK dental practices.
Why the split matters beyond VAT
Separating the streams is not housekeeping for its own sake. Three concrete things depend on it.
NHS pension
For a practitioner dentist (sole trader or partner), pensionable earnings derive from NHS-derived income only. Private fee income is not NHS-pensionable. If your ledger blends the two, the year-end pension certificate becomes a reconstruction exercise rather than a read-off. A clean NHS line feeds the certificate directly and reduces the risk of over or under stating pensionable pay. We cover what does and does not count in our guide to NHS pensionable pay for dentists.
Management information
Without segmentation you are guessing at the economics of each side. With it, you can see profitability per stream, set chair-time priorities on evidence rather than instinct, and judge whether an associate filling UDA targets is generating an adequate return against their fee share. The same data tells you whether a capital purchase such as digital imaging is justified by the private revenue it actually serves.
Cosmetic VAT exposure
The income split is also the early-warning system for VAT. If cosmetic-only treatment is coded separately from clinical care, you can see the taxable line growing and watch it against the threshold, rather than discovering a registration obligation after the fact.
Getting the NHS side right: UDA reconciliation in the accounts
The single most NHS-specific accounting point is the year-end reconciliation, and it is where blended practices most often go wrong.
NHS contract payments arrive monthly against an annual target, but the money is not finally earned until delivery is reconciled. The outcome drives the accounting treatment:
- Deliver 96 to 100 percent of target (under-deliver by 4 percent or less): the shortfall is carried forward into next year's required activity. This is not a cash clawback, it is a heavier delivery obligation on the same money. In the accounts it is a disclosure and going-concern point, not a provision against income.
- Deliver below 96 percent of target: the commissioner recovers the overpayment for the activity not delivered. This is a genuine clawback that hits cash, so it should be provided for as an accrued liability reducing income as soon as under-delivery looks likely.
- Over-delivery: a commissioner may allow a tolerance and pay for delivery above target, but this is discretionary, not guaranteed, so do not bank it in your numbers.
The accounting discipline is to keep these two outcomes apart. A clawback hits cash and belongs in the current year as a liability. A carry-forward hits next year's workload and belongs in the narrative, because the practice then has to deliver more UDAs for the same contract value. Tracking UDA delivery against target monthly, rather than discovering the position at year-end, is what turns this from a nasty surprise into a managed number.
Structuring the management accounts
Effective management accounts for a blended practice need a few layers of detail beyond the statutory minimum.
Income segmentation
Break revenue into NHS contract income (with UDA delivery context), private fee-per-item and plan income, hygiene income, and any cosmetic or aesthetic line shown separately for the VAT reason above. Where possible, track income per clinician within each stream, so you can see whether individual associates are generating adequate returns against their costs.
Cost allocation
Some costs attach directly to a stream: lab work for private crowns, specific materials for NHS bands. Others are shared, such as rent, utilities, and reception. A reasonable allocation method (often based on chair time or treatment hours) gives you a meaningful profit-per-stream figure without over-engineering the numbers.
Indicators worth tracking
- Revenue per UDA delivered, watched against rising costs, to test whether the NHS contract still earns its place.
- Private plan conversion, the proportion of patients taking up private treatment.
- Lab costs as a percentage of private revenue, a quick sense check on private margin.
- Associate cost ratio per stream, what share of production goes to associate fees on each side.
- Hygienist contribution, revenue generated against total employment cost.
Linking operational clarity to year-end tax
Year-end compliance is far smoother when the underlying bookkeeping already answers the obvious questions: who earned what, on which stream, what was capital rather than revenue spend, and where any NHS clawback or carry-forward sits. None of this is exotic, but it is much harder to reconstruct after the fact than to capture as you go.
Clean segment reporting also pays off the moment you need it for something bigger. On a sale, refinance, or partnership change, a buyer or lender wants to see where the profit comes from and how sustainable each stream is on its own. A practice that can show NHS and private profitability separately, with the UDA position clearly stated, is in a stronger position than one presenting a single blended number. If you want to see how these streams flow through to the headline figures, our guide to reading a dental practice profit and loss account walks through the revenue and cost lines in order.
Common mistakes in mixed practice accounting
- Treating all income as one pool, which hides the true profitability of each stream and makes the pension certificate harder than it needs to be.
- Assuming private work is VATable, the costliest myth, when clinical care is exempt whoever funds it and only cosmetic-only treatment is standard-rated.
- Failing to reconcile NHS delivery monthly, so a clawback below 96 percent or a carry-forward at year-end arrives as a surprise.
- Confusing a carry-forward with a clawback, providing against income when the issue is actually next year's workload, or vice versa.
- Over-allocating overheads to private work, which inflates private costs and understates the true resource burden of NHS activity.
Get these fundamentals right and the accounts stop being a once-a-year compliance chore. They become a tool that tells you, stream by stream, where your practice actually makes its money and where it quietly loses it.