Managing dental practice overhead costs well is one of the clearest levers a principal has over take-home profit. Most owners know their turnover to the pound, yet far fewer can state their overhead percentage or say how it compares with practices of a similar size and NHS-private mix. That gap matters, because in a typical practice overheads consume the large majority of every pound of revenue before any profit reaches the owner.
Overhead is, broadly, everything the practice spends to keep the doors open and the surgeries running: staff, premises, materials, the dental laboratory, equipment maintenance, software and IT, indemnity, marketing and utilities. Some of these are fixed (rent, rates, core salaries), some flex with activity (materials, lab work), and some sit in between. Understanding the mix, benchmarking each block and applying steady control to the controllable items is what separates a comfortable practice from one that works hard and banks little.
Understanding your overhead ratio
The overhead ratio is total overhead costs divided by gross revenue, expressed as a percentage. For UK practices a healthy ratio commonly sits between 65 and 75 percent for NHS-heavy practices and 60 to 70 percent for private practices, with well-run specialist practices often lower. The point is not to chase a single magic number, it is to know your own figure, watch its trend and understand what is driving it.
The leverage here is real. On a practice turning over half a million pounds, shaving the overhead ratio by five percentage points releases an extra twenty-five thousand pounds of profit. That profit is then taxed (corporation tax for a company at 19 percent on small profits up to 50,000 pounds, 25 percent above 250,000 pounds with marginal relief in between, or income tax and Class 4 National Insurance for the unincorporated), but a saved pound of cost is far easier to win than the additional revenue needed to net the same amount. Cost discipline, in other words, usually beats a sales push for return on effort. For how overheads feed through to the bottom line, see our guide to dental practice profit margins and benchmarking.
The VAT reality most practices miss
Here is the single most important and most overlooked point about dental overheads. The supply of dental care is exempt from VAT under VATA 1994 Schedule 9 Group 7, whether NHS-funded or private. Exempt is not the same as zero-rated. A practice making only exempt supplies is generally not VAT-registered and therefore cannot reclaim the input VAT it pays on its overheads.
The consequence is that materials, equipment, maintenance contracts, IT subscriptions, professional fees and most other purchases are a VAT-inclusive cost to the practice. The 20 percent that a VAT-registered retailer or builder would recover is, for an exempt dental practice, simply part of the price. When you compare a supplier quote or read a benchmark, remember that your real cost is the gross figure, not the net. This also flatters cross-sector comparisons: a cost benchmark borrowed from a VAT-registered business understates the true burden on an exempt practice.
There is one nuance. A practice with material cosmetic-only or aesthetic income (treatment with no therapeutic purpose, which can be standard-rated) may cross the 90,000 pound registration threshold on its taxable turnover and become partially exempt. It can then recover the input VAT attributable to its taxable supplies and a proportion of overhead VAT, subject to the partial-exemption rules. For the overwhelming majority of practices, though, the working assumption is the right one: overhead VAT is irrecoverable, so price every cost decision on the figure you actually pay.
The main overhead categories and typical ranges
The table below sets out the principal overhead categories and the broad range each tends to occupy as a percentage of revenue in UK general practice. Treat these as orientation ranges, not targets: your figures will move with your NHS-private mix, your premises arrangement (freehold, lease or owner-occupied) and your treatment profile. Materials and laboratory costs are strictly variable cost of sales rather than fixed overhead, but they are included so you can see the full cost picture in one place.
| Overhead category | What it includes | Typical % of revenue |
|---|---|---|
| Staff costs | Nurse, reception, hygienist and practice-manager salaries, employer NIC, pensions, training | 35 to 45% |
| Premises (rent & rates) | Rent or mortgage interest, business rates, buildings insurance | 6 to 12% |
| Laboratory costs | Crowns, dentures, bridges and other patient-specific lab work | 8 to 15% |
| Clinical materials | Consumables, instruments, decontamination supplies | 6 to 10% |
| Equipment maintenance | Service contracts, repairs, compressor and chair upkeep, calibration | 1 to 3% |
| Software & IT | Practice-management software, imaging, cloud, cyber and support | 1 to 3% |
| Indemnity & insurance | Professional indemnity, employers' and public liability cover | 1 to 3% |
| Marketing | Website, online presence, recall campaigns, local advertising | 1 to 4% |
| Utilities | Electricity, gas, water, waste and clinical waste disposal | 1 to 3% |
These bands overlap and interact. A predominantly private practice may carry a heavier marketing and lab cost but a leaner staff ratio per pound of revenue, while an NHS-heavy practice often runs higher staffing relative to income because the contract rewards throughput. Read each line against your own model, not the sector average alone.
Staff costs, and the 2025 employer NIC step-up
Staff is almost always the largest overhead, and it became more expensive from 6 April 2025. Employer (secondary Class 1) National Insurance now runs at 15 percent on pay above a secondary threshold cut to 5,000 pounds. Both moves push up the cost of every employed role above that threshold, so the payroll line in a 2026/27 set of accounts carries a heavier NIC charge than the same headcount did two years ago.
The practical responses are to monitor the staff-cost percentage monthly, to plan around the Employment Allowance where it is available (it is set at 10,500 pounds but is not available to a company whose only employee is a single director), and to make sure any spouse or family employment is genuine and paid at a market rate for real, documented work. A genuinely employed family member can change the picture, but illusory or above-market pay is disallowed, so keep records of hours and duties and run the pay through PAYE.
Premises, rates and utilities
Premises bundles rent or mortgage interest, business rates, buildings insurance, repairs and the utilities that keep clinical equipment running. Location is a judgement call: a prime position can justify a higher premises cost if it generates proportionally more revenue, but a high rent against thin footfall quietly erodes margin. Utilities deserve attention in their own right because compressors, autoclaves, chairs and imaging are energy-hungry. LED lighting, efficient compressors and smart heating controls reduce bills, and qualifying plant attracts capital allowances, which is a separate and worthwhile relief.
Laboratory and clinical materials
Laboratory work and clinical materials are variable costs that rise and fall with the treatment you do, which is why they are best tracked as cost of sales rather than buried in general overhead. Recorded properly they give you an accurate gross margin and an early signal if a pricing or supplier problem is developing. Because the detail (cost-of-sales classification, the lab-specific VAT position and what your accounts should show) deserves its own treatment, see our dedicated guide to laboratory costs in dental accounts.
Equipment maintenance, software and indemnity
The smaller recurring lines (service and maintenance contracts, practice-management and imaging software, cyber and IT support, and professional indemnity) are individually modest but collectively meaningful, and they tend to renew on autopilot. Each is a candidate for annual review. Remember the VAT point above: the subscription or premium you see is the real cost, because the input VAT is not recoverable for an exempt practice.
Cost control strategies that actually work
Book monthly management accounts
You cannot control what you do not measure on a useful timescale. Year-end accounts tell you what already happened; monthly management accounts tell you what is happening now, while you can still act. Track the overhead percentage, staff cost as a percentage of revenue, revenue per clinical hour and gross margin every month and the trend will warn you long before the annual accounts confirm a problem. Our guide to management accounts and the metrics to track sets out exactly which numbers to put in front of yourself each month.
Review contracts on an annual cycle
Equipment maintenance agreements, insurance and indemnity, utility tariffs and software subscriptions all reward scrutiny. Loyalty rarely earns the best rate, suppliers tend to reserve their keenest pricing for new customers, and even a small percentage saving compounds across a multi-year contract. Put a recurring annual review in the diary and ask your accountant which agreements are worth challenging this year.
Improve energy efficiency
Utility costs are both controllable and capital-relievable. Efficient compressors, LED lighting and modern heating controls cut the running cost, and the qualifying capital spend can attract allowances that reduce the tax bill. It is one of the few overhead categories where a sensible investment lowers cost twice, once on the bill and once on the tax.
Optimise staffing, do not just cut it
Staffing optimisation is about the right people in the right roles, not a blunt headcount cut. Calculate revenue per employee and watch its trend. A treatment coordinator who lifts case acceptance, or an additional hygienist whose recall book more than covers their cost, can be margin-positive even though they add to the staff line. With employer NIC now at 15 percent above a 5,000 pound threshold, the cost of each role is higher, so the case for each hire needs to be made on the contribution it generates, not on gut feel.
Common overhead management mistakes
Three errors recur. The first is chasing revenue while ignoring cost: a 10 percent cut in overheads usually drops more to the bottom line than a 10 percent rise in turnover, and it is generally easier to deliver. The second is cutting arbitrarily rather than strategically, for example slashing marketing or deferring equipment maintenance, both of which tend to cost more later than they save now. The third, and most common, is having no monthly financial rhythm at all, so cost creep is only discovered when the annual accounts land and the year is already gone.
Planning for changes in your overhead structure
Your overhead profile is not static. Expansion, a new service line, a significant equipment purchase or a practice acquisition all reshape the ratios, and seasonal dips (a quiet December against unchanged fixed costs) temporarily inflate the percentage. Budget for these movements rather than reacting to them, and model the combined cost base carefully before any acquisition so you understand the merged practice's true overhead, including the VAT-inclusive cost of everything it buys.
The role of professional advice
Controlling overheads is ongoing management, not an annual fire drill. A specialist dental accountant helps you set the right benchmarks, classify costs correctly so your gross and net margins are accurate, build the monthly reporting that catches creep early and structure staff and supplier arrangements tax-efficiently. The right support is advisory, not just compliance: it should help you make data-driven decisions about where your money goes and what you keep.