What Is Goodwill Amortisation in a Dental Practice Context?
Goodwill is the intangible value of a dental practice above its tangible assets. When you buy a practice, the purchase price typically splits between physical assets (chairs, X-ray equipment, leasehold improvements) and goodwill. Goodwill reflects the practice's patient list, reputation, location, and NHS contract value.
For accounting purposes, goodwill is an intangible fixed asset. Under UK GAAP (FRS 102), purchased goodwill must be amortised over its estimated useful life. For tax purposes, HMRC allows a deduction for this amortisation, but only under specific rules that changed significantly in 2019.
If you bought a dental practice on or after 1 April 2019, the goodwill qualifies for tax relief at a fixed rate of 6.5% per year on a straight-line basis. This is not a choice. It is the statutory rate set by the Finance Act 2019, which reintroduced relief for goodwill on acquisitions of trades with eligible intellectual property.
Why the 2019 Rule Change Matters for Dentists
Between 8 July 2015 and 31 March 2019, the government removed tax relief on purchased goodwill entirely. That meant if you bought a practice in that window, the goodwill sat on your balance sheet with no tax deduction. Many dentists were caught out, paying corporation tax on profits that included no amortisation relief.
The Finance Act 2019 reversed this for acquisitions from 1 April 2019 onwards. The relief is now 6.5% per year of the goodwill cost. Over a 15.4-year period, the full goodwill is written off for tax purposes. However, the accounting amortisation period may differ. You must track the two separately.
For a dental practice buyer today, this relief is valuable. A typical practice purchase might allocate 60-80% of the price to goodwill. On a £1m practice, that means £600,000 to £800,000 of goodwill. At 6.5% per year, the annual tax deduction is £39,000 to £52,000. Over 15 years, that saves a company paying 25% corporation tax approximately £146,000 to £195,000 in tax.
Worked Example: Dr Patel Buys a Mixed NHS-Private Practice
Dr Patel purchases a single-handed dental practice for £950,000 in June 2024. The breakdown is:
- Tangible assets (chairs, compressors, OPG, leasehold improvements): £200,000
- Goodwill: £750,000
Dr Patel operates through a limited company. The goodwill amortisation for tax purposes is £750,000 x 6.5% = £48,750 per year. Assuming the company pays corporation tax at 25% (profits exceed £250,000), the annual tax saving is £48,750 x 25% = £12,187.50.
Over the full 15.4-year amortisation period, total tax saved is approximately £187,500. This is a real cash benefit. Without the post-2019 rule, Dr Patel would have no relief at all.
What Qualifies for the 6.5% Amortisation Rate?
The relief applies to goodwill acquired as part of the purchase of a business that includes eligible intellectual property. For dental practices, the relevant IP is typically the patient list and the NHS contract rights. HMRC accepts that these constitute "relevant assets" for the purposes of the relief.
Key conditions:
- The acquisition must be of a trade or business, not just assets in isolation.
- The goodwill must be purchased from an unconnected party. Purchases from a spouse or connected company may be challenged.
- The relief applies to companies. Unincorporated sole traders and partnerships do not get this specific relief; they treat goodwill differently under capital gains rules.
- The goodwill must be recognised in the company's accounts as an intangible fixed asset.
If you bought a practice between 8 July 2015 and 31 March 2019, you get zero tax relief on goodwill. That is a hard rule with no exceptions. If you are still holding that goodwill, you cannot now claim retrospective relief.
What About Goodwill Purchased Before July 2015?
Goodwill acquired before 8 July 2015 qualified for tax relief under the old rules, typically at 4% per year on a reducing balance basis. That regime is grandfathered. If you bought in 2014, your existing amortisation schedule continues unchanged. The 6.5% rate only applies to acquisitions from 1 April 2019 onwards.
How Does This Affect Your Practice Accounts?
In your company's statutory accounts (prepared under FRS 102), goodwill must be amortised over its estimated useful life. Many dental practices use a 10-year useful life, giving a 10% annual amortisation charge in the accounts. But for tax purposes, HMRC only allows the 6.5% rate.
This creates a timing difference. In years 1-10, the accounting amortisation (10%) exceeds the tax amortisation (6.5%). The company pays more tax in those years than the accounts suggest. In years 11-15, the accounting amortisation is zero (goodwill fully written off in the books), but the tax amortisation continues at 6.5%. The company gets a tax deduction with no corresponding accounting charge.
Your accountant must maintain a deferred tax calculation to track this. It is not complex, but it is easy to overlook. If your accountant does not specialise in dental practices, ask them specifically about the goodwill amortisation rate and the deferred tax position.
Interaction with Capital Allowances and the s.198 Election
When you buy a dental practice, the seller may have claimed capital allowances on fixtures (chairs, compressors, suction units, X-ray machines). Under the CAA 2001 s.198 election, you and the seller can agree a fixed value for those fixtures. This value is then treated as your capital allowances pool, giving you AIA relief at 100% up to £1m.
The s.198 election is separate from goodwill. But the allocation between fixtures and goodwill matters. If you over-allocate to fixtures (to get immediate AIA relief), you under-allocate to goodwill, reducing your 6.5% annual relief. The reverse is also true. HMRC may challenge an allocation that looks unreasonable.
Typical allocations for a dental practice purchase:
- Fixtures and equipment: 15-30% of total price
- Goodwill: 60-80%
- Leasehold improvements (SBA at 3%): 5-15%
Work with a dental-specialist accountant to get the split right. A poor allocation can cost you thousands in lost tax relief over the life of the practice.
What Happens When You Sell the Practice?
When you sell a dental practice, the goodwill is a capital asset. The gain is subject to Capital Gains Tax (CGT), not income tax. If you hold the practice through a company, the company sells the goodwill and pays corporation tax on the gain (19% or 25%). You then extract the proceeds as dividends or a capital distribution.
Business Asset Disposal Relief (BADR) may apply if you sell the company shares (not the assets directly). BADR gives a 14% CGT rate in 2025/26, rising to 18% from April 2026. The lifetime limit is £1m of gains.
If you sell the practice assets (including goodwill) directly as a sole trader or partnership, the gain on goodwill is treated as a capital gain. You may qualify for BADR on the disposal of your business. The rate is the same: 14% in 2025/26, 18% from April 2026.
There is a trap here. If you have amortised goodwill in your company accounts at 6.5% per year, the tax base cost of the goodwill reduces each year. When you sell, the gain is calculated as sale price minus the remaining tax base cost. The amortisation relief you claimed over the years reduces your base cost, increasing the gain. This is normal. It means the tax relief is a deferral, not a permanent saving, unless you hold the practice until death (when base cost is uplifted to market value).
For most dentists, the deferral is still valuable. You get tax relief at 25% corporation tax now, and pay CGT at 14-18% later. The net benefit is the rate difference, plus the time value of money.
Common Mistakes Dentists Make with Goodwill Amortisation
- Assuming all goodwill qualifies for relief. It does not if purchased between July 2015 and March 2019.
- Using the accounting amortisation rate (e.g. 10%) for tax returns. You must use 6.5% for tax purposes.
- Forgetting to track the deferred tax position. This can cause surprises when the company's effective tax rate differs from the statutory rate.
- Not making a s.198 election for fixtures. Without it, HMRC may challenge your capital allowances claim.
- Overpaying for goodwill without understanding the tax consequences. A higher goodwill figure means more amortisation relief, but also a larger CGT bill on sale.
Practical Steps for Practice Buyers
If you are buying a dental practice, here is what to do:
- Get a professional valuation that splits the price between tangible assets, goodwill, and leasehold improvements.
- Instruct a dental-specialist accountant to review the allocation before exchange.
- Ensure the sale and purchase agreement includes a s.198 election for fixtures.
- Confirm the acquisition date falls on or after 1 April 2019 to qualify for the 6.5% rate.
- Set up a fixed asset register that tracks goodwill separately from other intangibles.
- Ask your accountant to prepare a deferred tax schedule showing the annual amortisation and the resulting deferred tax liability or asset.
For more detail on practice purchase financial due diligence, see our guide to practice purchase financial due diligence. If you are considering a sale, the goodwill valuation and sale playbook covers the vendor side.
Summary
Goodwill amortisation on a dental practice acquired after 1 April 2019 gives tax relief at 6.5% per year. This is a fixed statutory rate. It applies to company purchases only. The relief is valuable, typically saving tens of thousands of pounds in corporation tax over the life of the practice. But the rules are specific. If you bought between July 2015 and March 2019, you get no relief. If you are buying now, get the allocation right and track the deferred tax position.
Every practice purchase is different. Speak to a dental-specialist accountant who understands goodwill amortisation, capital allowances, and the interaction with your eventual sale. Our team at Dental Finance Partners works exclusively with UK dentists and can help you structure your acquisition for maximum tax efficiency.