Introduction: Why Buying a Dental Practice Needs Two Tax Plans
Buying a dental practice in Britain is one of the largest financial decisions an American clinician or investor will make here. Independent practices commonly change hands at 2.5 to 4.5 times adjusted earnings, and corporate groups pay considerably more. Furthermore, goodwill usually makes up 60 to 80 per cent of the price. However, every British guide to the process assumes a buyer who files a single tax return with HMRC.
You file two. As a US citizen or green card holder, you report the same practice to HMRC and to the IRS. Moreover, the two systems disagree about the items that matter most. Britain gives a company no deduction for purchased dental goodwill, yet it lets you write off the equipment in a single year. America, in contrast, amortises the goodwill over 15 years and spreads the equipment over a longer life. Consequently, the practice shows one profit in London and another in Washington.
This guide explains how both countries tax an American buying a dental practice in 2026. It covers who may own a practice, the purchase taxes, the annual profit, the US anti-deferral rules, the reporting forms and the eventual sale. In addition, it works through a full case study with numbers. At TaxYork, we prepare US and UK returns for American company owners in Britain. This is the analysis we run before a client signs heads of terms.
Who Can Own a UK Dental Practice and How
The Legal Rules on Buying a Dental Practice
Buying a dental practice is open to non-dentists, but only through a company with the right board. Section 43 of the Dentists Act 1984 makes it an offence for a company to carry on dentistry unless a majority of its directors are registered dentists or registered dental care professionals. The regulator explains the rule in its guidance on corporate dentistry. Therefore, an American investor may hold the shares, but registered clinicians must control the boardroom.
Individuals buying a dental practice face a stricter rule. A sole owner or partner who carries on the business of dentistry must be registered. An American dentist who trained in the United States therefore needs UK registration before owning a practice personally. Additionally, every provider in England must register with the Care Quality Commission before it treats patients. A new owner buying the assets needs a fresh registration, so the timetable belongs in the deal plan.
Sole Trader, Partnership or Limited Company
Three ownership forms dominate when buying a dental practice. Many principals still practise as sole traders or in partnerships and pay income tax on the profit at up to 45 per cent. Others operate through a limited company and pay corporation tax at 19 to 25 per cent. The choice shapes your American position completely. A sole practice flows straight onto your Form 1040. A company, however, is a foreign corporation with its own US filing regime. Consequently, the form you choose when buying a dental practice fixes ten years of US compliance.
The NHS Contract Is Not an Ordinary Asset
An NHS contract cannot simply be sold when buying a dental practice. General dental services contracts prohibit assignment, so buyers of unincorporated practices traditionally use the partnership route. The seller admits the buyer as a partner on the contract and retires some months later. A transfer into a company needs the commissioner's prior consent, and nothing guarantees it. Furthermore, a contract held by a company may bar a change of control without approval. As a result, a share purchase of an NHS practice needs regulatory clearance as well as tax planning.
Associates and the Status Question
Anyone buying a dental practice also inherits its associates. Associate dentists generate much of a practice's income, and they typically keep 45 to 55 per cent of their fees. Most work on a self-employed basis. However, HMRC withdrew its dentist-specific guidance at ESM4030 from 6 April 2023. Status now depends on the ordinary employment tests. If HMRC later treats an associate as an employee, the practice owes PAYE and employer National Insurance. Therefore, a buyer of shares inherits that exposure, and the price or the warranties should reflect it.
UK Purchase Taxes: Assets, Shares and Goodwill
Asset Purchase Versus Share Purchase
The deal structure decides the purchase taxes on buying a dental practice. In an asset purchase, you buy the goodwill, the equipment and the premises interest. Stamp duty land tax applies only to the property element, at the non-residential rates of nil to £150,000, two per cent to £250,000 and five per cent above. Goodwill and equipment bear no stamp duty at all. In a share purchase, you pay stamp duty at 0.5 per cent of the price, and you inherit the company's history.
Sellers, however, generally prefer shares. A share sale gives them a single capital gain and access to Business Asset Disposal Relief. Buyers, in contrast, usually prefer assets, because they start clean and obtain fresh capital allowances. The American buyer has a further reason. An asset purchase gives the new company a full-cost basis for US amortisation of goodwill. A share purchase does not, unless you make a section 338(g) election to reset the basis for US purposes.
Goodwill: No UK Relief, Fifteen Years of US Relief
Goodwill is where the two countries part company on buying a dental practice. A UK company obtains corporation tax relief on purchased goodwill only at a fixed 6.5 per cent a year, and only where it acquires qualifying intellectual property with the business. The relief is capped at six times the cost of that property. A dental practice rarely owns patents or registered designs. Consequently, most buyers receive no UK deduction for the largest part of the price.
America takes the opposite view. Purchased goodwill is a section 197 intangible, amortised on a straight line over 15 years under section 197 of the Internal Revenue Code. On £1 million of goodwill, that is roughly £66,700 of annual US deduction with no British equivalent. Therefore, your US-measured profit runs below your UK profit for 15 years. That gap matters when the anti-deferral rules test how much UK tax the company has paid.
VAT: Exempt Care and Its Hidden Cost
Dental care by registered professionals is exempt from VAT, as HMRC sets out in VAT Notice 701/57 on health professionals. Therefore, buying a dental practice means acquiring an exempt business that charges no VAT on treatment. It also means the practice recovers none on equipment, laboratory bills, rent with VAT or professional fees. Purely cosmetic services can fall outside the exemption, so a practice with a large aesthetics offering may need to register. Notably, irrecoverable VAT earns no US foreign tax credit. It becomes part of your cost base instead.
UK Tax on the Profit After Buying a Dental Practice
Corporation Tax, Salary and Dividends
A company pays corporation tax at the published rates. The small profits rate is 19 per cent up to £50,000, and the main rate is 25 per cent above £250,000, with marginal relief between. Owners then extract profit as salary or dividends, each taxed again personally. Staff costs weigh heavily. Employer National Insurance runs at 15 per cent above £5,000 per employee for 2026-27. After buying a dental practice, most owners find that nurses, reception staff and associates absorb well over half of fee income.
Capital Allowances on Chairs, Scanners and Fit-Out
Equipment attracts generous UK relief when buying a dental practice. The annual investment allowance gives a 100 per cent deduction on up to £1 million a year, including second-hand plant bought with a practice. Dental chairs, imaging units, sterilisation equipment and cabinetry all qualify. In addition, a 40 per cent first-year allowance applies to new main rate plant from 1 January 2026. Any balance enters pools written down at 14 per cent or 6 per cent a year. Where you buy a freehold, a section 198 election fixes the value of fixtures with the seller.
Unincorporated Owners: Income Tax and National Insurance
Alternatively, an individual buying a dental practice as a sole trader or partner pays income tax on the whole profit as it arises, at 20, 40 or 45 per cent, plus Class 4 National Insurance. No second layer applies on extraction. Purchased goodwill gives an unincorporated buyer no income tax deduction either, because it is capital. Many owners later incorporate. UK incorporation relief can defer the capital gain where the whole business passes to a company for shares. However, the United States does not follow that deferral, as the next section explains.
How the IRS Taxes an American-Owned UK Dental Company
A Controlled Foreign Corporation With Annual Filings
A UK company that Americans control is a controlled foreign corporation. You file Form 5471 with your return each year, and the penalty for omission starts at $10,000 per form. Moreover, the company's profit is recomputed under US principles, in dollars. Buying a dental practice through a company therefore requires a second set of tax accounts that a UK accountant does not produce.
Dental Fees as Tested Income
After buying a dental practice through a company, the fees for treating patients in Britain are active services income. They escape the older subpart F rules, because the company performs the services in its own country. However, they fall into net CFC tested income, the regime formerly called GILTI, reported on Form 8992. From 2026, a corporate shareholder deducts 40 per cent of the inclusion, giving a 12.6 per cent effective rate. An individual receives no deduction and no credit for UK corporation tax by default. The inclusion is then taxed at up to 37 per cent.
However, two elections change that result. The high-tax exclusion removes the income entirely where the UK effective rate exceeds 18.9 per cent of US-measured income. Alternatively, an election under section 962 taxes you as a US corporation. You then receive the 40 per cent deduction and a credit for 90 per cent of the UK tax. Our guide to the section 962 election for US owners of UK companies sets out the mechanics.
The First-Year Trap When Buying a Dental Practice
Consequently, the first year carries a specific danger. A UK accountant will claim the annual investment allowance on all the equipment at once. On a practice with £165,000 of plant, that claim can cut UK taxable profit below £50,000 and the tax rate to 19 per cent. Meanwhile, US rules spread the same equipment over several years. As a result, UK tax can fall to seven per cent of US-measured income. The high-tax exclusion then fails, and the year's profit reaches your Form 1040.
The remedy is restraint. UK law allows a company to claim less than the full allowance. You can therefore size the claim so that UK tax stays above 18.9 per cent of US income. The unclaimed balance enters the pools and is relieved later. Nevertheless, the trade is usually worthwhile, because a delayed UK deduction is a timing cost. An uncredited US charge is permanent. From the second year, the 15-year goodwill deduction normally keeps the UK effective rate comfortably above the line.
Checking the Box on the Company
One further option exists when buying a dental practice through a company. A private UK limited company is not on the US list of entities that must be corporations. Treasury Regulation 301.7701-2 names only the public limited company. You may therefore elect on Form 8832 to treat the company as transparent, and you then file Form 8858 instead of Form 5471. Profit flows to your personal return, and UK corporation tax becomes directly creditable. However, an election made after formation triggers a deemed liquidation. The choice needs modelling before the company is formed.
Owning the Practice Personally as an American Dentist
Schedule C, the Exclusion and the Credit
An American dentist buying a dental practice as a sole trader reports the profit on Schedule C. Two reliefs compete. The foreign earned income exclusion removes up to $132,900 of earned income for 2026, claimed on Form 2555. Alternatively, the foreign tax credit on Form 1116 offsets US tax with UK income tax paid. For a principal earning well above the exclusion at UK rates of 40 and 45 per cent, the credit usually produces the better answer and leaves surplus credits to carry forward.
Self-Employment Tax and the Totalisation Agreement
Furthermore, buying a dental practice personally raises the question of self-employment tax. A charge of 15.3 per cent would otherwise apply to a sole practitioner's profit. The US-UK totalisation agreement prevents the double charge. A self-employed person resident in Britain pays UK National Insurance only. You should hold a certificate of coverage from HMRC and note the exemption on your return. Without it, the IRS computes the tax automatically, and many Americans pay it in error.
Incorporating Later: Section 367 Bites
Incorporation after buying a dental practice personally is where UK and US rules collide. Britain can defer the gain on goodwill transferred to a company for shares. America does not. A US person who transfers appreciated property, including goodwill, to a foreign corporation generally recognises the gain immediately under section 367, and reports the transfer on Form 926. Consequently, an American dentist who incorporates an established practice can owe US tax on goodwill with no UK tax to credit. Decide the structure before buying a dental practice, not five years afterwards.
Reporting Forms and the Filings Americans Miss
Company Accounts, FBAR and Form 8938
After buying a dental practice, owners often overlook its bank accounts. If you own more than half the shares, you have a financial interest in each company account for the FBAR filed with FinCEN. Signature authority alone also triggers a filing. Patient payment plans and NHS receipts push balances past $10,000 immediately. Your shares belong on Form 8938 unless Form 5471 already reports them. Our FBAR and FATCA reporting service handles both filings.
Missed US Tax Returns After Years in Practice
Missed reporting is common among American dentists who have practised in Britain for years. Many filed UK returns carefully and never reported the company, the partnership or the accounts to the IRS. If that describes you, act before a notice arrives. Where the failure was non-wilful, the IRS Streamlined Filing procedures may allow three years of returns and six years of FBARs. Preparing those missed US tax returns also establishes the earnings history you will need on sale.
Selling the Practice: UK Relief Against US Tax
Business Asset Disposal Relief at 18 Per Cent
Britain rewards the sale of a trading business, which matters from the day of buying a dental practice. Business Asset Disposal Relief applies where you have owned at least five per cent of the company and served as an officer or employee for two years. The rate is 18 per cent for disposals from 6 April 2026, on a lifetime limit of £1 million of gains. Gains above the limit pay the main rates of 18 or 24 per cent. A sole trader selling the whole practice can claim the same relief.
The US Side of the Sale
Meanwhile, America taxes the gain at up to 20 per cent. Under section 1248, part of the gain on shares in a controlled foreign corporation is treated as a dividend to the extent of untaxed earnings. For a UK company, that dividend normally still qualifies for the 20 per cent rate. The 3.8 per cent net investment income tax also applies to a gain on company shares, whether or not you work in the practice. In contrast, a sole practitioner who sells the assets of a practice in which they materially participate can generally keep that gain outside the surtax.
Will UK Tax Cover the US Bill?
Finally, the foreign tax credit depends on sourcing. For an American living in Britain, a share gain is foreign source only where a foreign country taxes it at ten per cent or more. The 18 per cent relief rate clears that test. However, 18 per cent is below the US 20 per cent rate, so a top-up of about two points arises on the first £1 million. Above the limit, the 24 per cent UK rate covers the US charge in full. Our tax treaty and foreign tax credit service models the sale before you sign.
Case Study: A Mixed Practice in Surrey
The Purchase
Consider Emily, an American dentist registered in Britain and resident in Surrey. In April 2026, she forms a UK limited company to buy a mixed NHS and private practice. Gross fees are £900,000 and adjusted earnings are £270,000. The price is £1,215,000, which is 4.5 times earnings. Goodwill accounts for £1,050,000 and equipment for £165,000, and the premises are leased. Emily invests £365,000 and the company borrows £850,000 at seven per cent. This illustration of buying a dental practice uses sterling throughout for clarity.
Year One in Britain
In the first year after buying a dental practice, operating profit is £270,000 and interest costs £59,500. The UK accountant claims the full annual investment allowance of £165,000 on the equipment. Goodwill attracts no relief. Taxable profit is therefore £45,500, and corporation tax at 19 per cent is £8,645. From a British viewpoint, the first year is a success.
Year One in America
The IRS computes a different figure. It allows goodwill amortisation of £70,000 and equipment depreciation of about £18,333 over a nine-year life. US-measured income is therefore £122,167 before UK tax. The UK tax of £8,645 is only 7.1 per cent of that figure, so the high-tax exclusion fails. Without an election, Emily faces tax of up to 37 per cent, which is about £45,200. With a section 962 election, the charge is £15,393 less a credit of £7,781, leaving £7,612.
The Fix
Emily's preparer runs the alternative before the UK return is filed. The company claims only £100,000 of allowances, which leaves UK taxable profit of £110,500. With marginal relief, corporation tax is £25,533. That is 20.9 per cent of US-measured income, so the exclusion applies and no US tax arises. The remaining £65,000 of equipment enters the pool. In year two, UK tax rises to roughly 40 per cent of US income, because the goodwill deduction exists only in America. The danger is confined to the first year.
The Exit
Eight years later, Emily sells the shares for a gain of £900,000. Britain charges 18 per cent under the relief, which is £162,000. America charges 20 per cent, which is £180,000, and credits the UK tax. A US balance of £18,000 remains. In addition, the 3.8 per cent surtax applies to a gain on shares and adds £34,200 with no credit. Her total exit tax is therefore £214,200.
How TaxYork Can Help
Both Returns Prepared From One Set of Facts
TaxYork prepares your US and UK returns side by side. The same profit, allowances and sale therefore appear consistently in both. We prepare Form 5471, Form 8992 and the annual high-tax or section 962 elections. Furthermore, we compute the company's income on US principles and test the effective rate before the UK capital allowances claim is finalised. For anyone buying a dental practice, that sequence prevents an uncredited American charge.
Pre-Purchase Review and Overdue Filings
We also review the terms of buying a dental practice before exchange. Specifically, we examine the ownership form, the asset or share route, the goodwill allocation and the funding terms. Where earlier years were missed, we prepare the overdue returns, FBARs and company forms as one coordinated filing. Our team works with clinicians, company owners and investors on both sides of the Atlantic. We provide comprehensive tax preparation and compliance across both systems, and our guide to care home investment for American owners shows the same approach in a neighbouring sector.
Conclusion
Buying a dental practice in Britain can deliver strong, stable earnings, and the UK tax system treats a trading practice well. Equipment qualifies for immediate relief, and a sale can attract an 18 per cent rate. For an American, however, each stage has a US counterpart. Goodwill is deductible in one country and not the other. A full allowances claim can break the high-tax exclusion. A later incorporation can trigger US tax on goodwill with no credit.
Therefore, settle the structure before you buy. Decide whether you will own personally or through a company, how that company is classified for US purposes and how fast you will claim allowances. Above all, compute the profit under both systems every year. With that discipline, buying a dental practice keeps the reliefs Britain offers and avoids an unnecessary American bill.
Contact Us
If you are buying a dental practice in Britain, or already own one, speak to our team before you exchange or before your next filing deadline. You can book a consultation with a US-UK specialist, email hello@taxyork.com or call 020 3488 8606. We will review your structure, your company accounts and your existing returns. We will then tell you exactly what each country expects from you.
Disclaimer
This article provides general information only and does not constitute tax, legal or financial advice. Tax rules in the United States and the United Kingdom change frequently, and their application depends on your individual circumstances. The case study is illustrative and simplified. You should obtain professional guidance tailored to your situation before acting on any matter discussed here. TaxYork accepts no liability for actions taken in reliance on this article.