Goodwill and Tax on a UK Business Sale: CGT, Income Tax and Related Party Rules

What Is Goodwill?

Goodwill is the value of a business over and above the value of its identifiable net assets. It represents the premium a buyer pays for an established business -- its customer relationships, brand reputation, trading history, and the expectation of ongoing profitability.

In many professional service firms, trades, and retail businesses, goodwill is the single largest asset being transferred. A dental practice may have minimal physical assets but enormous goodwill value from its patient list. A consulting firm's goodwill may derive from long-standing client relationships.

How goodwill is taxed on a UK business sale depends critically on:

1. Who is selling -- a sole trader, a partnership, or a company
2. Who is buying -- an unconnected third party or a related party (including your own company)
3. Whether BADR applies
4. How the consideration is structured

Goodwill Sold by a Sole Trader or Partnership

When an unincorporated business (sole trader or partnership) sells its goodwill to an unrelated buyer, the gain is a capital gain of the individual seller.

The gain is calculated as:

Proceeds from goodwill -- original cost of goodwill (usually nil for self-generated goodwill) = capital gain

Most trading businesses develop goodwill over time rather than purchasing it. This means the base cost is typically nil, so the entire proceeds represent a capital gain.

Tax Rates on the Gain

In 2026/27, capital gains on non-property business assets are taxed at:

• 10% for basic-rate taxpayers (after the GBP3,000 annual exempt amount)
• 20% for higher and additional-rate taxpayers

If Business Asset Disposal Relief applies, the rate is 18% on all qualifying gains up to the lifetime limit of GBP1 million.

Qualifying for BADR on a sole trader sale: The business must be a qualifying business, the seller must have owned it for at least two years, and the disposal must be of the whole or part of the business (not a disposal of an isolated asset).

Example: Sole trader with fifteen years of trading sells the business for GBP350,000 including GBP300,000 attributed to goodwill (nil base cost). With BADR:

• Gain: GBP300,000
• Less annual exempt amount: GBP3,000
• Taxable gain: GBP297,000
• Tax at 18%: GBP53,460

Without BADR (higher-rate taxpayer): GBP297,000 x 20% = GBP59,400.

Goodwill in a Company Sale

When a company sells a business as an asset sale (including goodwill), the company pays corporation tax on any gain:

• 19% on profits up to GBP50,000
• 25% on profits above GBP250,000
• Marginal relief on profits between GBP50,000 and GBP250,000

If the goodwill was originally purchased by the company (rather than self-generated), and if the intangible fixed assets (IFA) regime applies, any profit on disposal may be taxed as income rather than a capital gain -- with implications for the tax base cost and the timing of any reversal of previously claimed amortisation.

Self-generated goodwill created before April 2002 falls under the capital gains regime. Goodwill created on or after April 2002 (or purchased goodwill) falls under the IFA regime and is taxed as income.

The Post-Incorporation Restriction

One of the most significant restrictions in UK goodwill taxation is the post-incorporation restriction, introduced with effect from 3 December 2014 and consolidated in subsequent Finance Acts.

The restriction works as follows:

When an individual (or partnership) incorporates their business by transferring it to a company, the company may pay for the goodwill -- either in cash, via shares, or by recording the amount as a loan from the individual. Prior to 2015, the company could then claim a corporation tax deduction for amortising that goodwill over its useful life, while the individual paid CGT (potentially at the then-10% Entrepreneurs' Relief rate) on the proceeds.

From 3 December 2014, this deduction is denied where the goodwill is acquired from a related party -- that is, where the individual (or connected persons) has a relevant connection with the company. In practice, this means that when a sole trader incorporates and sells goodwill to their own new company, the company cannot claim a tax deduction for amortising that goodwill.

This denial applies even if the goodwill valuation was independently supported and the transaction was conducted at arm's length in every other respect.

Impact of the Restriction

Before the restriction, the arrangement was genuinely tax-efficient: the individual paid a low rate of CGT on the goodwill proceeds, and the company progressively deducted the cost over many years. The dual tax benefit made incorporation with a goodwill sale very attractive.

After the restriction, the company pays for goodwill that it cannot deduct for tax. The individual may still pay CGT on the proceeds, but BADR no longer applies to goodwill transferred to a related close company under specific rules introduced alongside the restriction. In many cases, the arrangement no longer offers meaningful tax savings.

Personal Goodwill vs Business Goodwill

The distinction between personal goodwill and business goodwill is important in valuations and increasingly important in HMRC disputes.

Personal goodwill attaches to a specific individual. Examples include:

• A surgeon's reputation and patient relationships
• An architect's established design following
• A solicitor's long-term client relationships

Business goodwill attaches to the entity. Examples include:

• An established brand name
• A loyal customer base that would remain regardless of the original owner
• Long-term commercial contracts in the company's name

HMRC scrutinises goodwill valuations, particularly where:

• The individual selling the goodwill remains involved in the business post-sale (as an employee or consultant)
• The goodwill is characterised as personal but the buyer appears to be paying for business continuity
• The valuation is significantly higher than independent benchmarks would suggest

Where HMRC successfully challenges a personal goodwill valuation, it may argue that part of the consideration should be treated as earnings (subject to income tax and NI) rather than a capital gain. This is particularly relevant in professional practices where the seller's ongoing involvement makes it difficult to separate their personal value from the business value.

Loan Consideration and Interest

A common structure when selling goodwill to a connected company is to leave the consideration outstanding as a loan owed by the company to the individual seller. This is often done because the company lacks cash to pay upfront.

Where the loan is between connected parties (e.g., the sole trader selling to their own company), HMRC requires that a market rate of interest be charged. If no interest is charged, or interest below the official rate is charged, the difference may be treated as:

• A distribution (taxable as a dividend) if the individual is also a shareholder
• An employment benefit if the individual is also an employee or director

HMRC's official rate for beneficial loans in 2026/27 is set periodically. The connected parties must ensure either a commercial interest rate is charged and declared, or they accept the tax consequences of the benefit.

Goodwill and VAT

The sale of a going concern business (including goodwill) can qualify as a Transfer of a Going Concern (TOGC), which is outside the scope of VAT. For TOGC treatment to apply:

• The buyer must intend to carry on the same kind of business
• The assets sold must be a business capable of separate operation
• If the seller is VAT-registered, the buyer must be (or become) VAT-registered
• The seller must not be a member of a VAT group that will not include the buyer

Where TOGC applies, no VAT is charged on the goodwill. This avoids a cash flow issue for the buyer (who would otherwise pay VAT and recover it, but with a delay).

If TOGC does not apply, VAT at the standard rate (20%) must be charged on the goodwill element. This is recoverable by a VAT-registered buyer but adds complexity and cash flow cost.

Third-Party vs Related-Party Sales

The most straightforward goodwill transaction from a tax perspective is always an arm's-length sale to an unconnected third party:

• The value is established by genuine commercial negotiation
• No related-party restrictions apply to the buyer's amortisation
• There is no HMRC argument about artificial goodwill values
• BADR applies cleanly where the qualifying conditions are met

Related-party transactions -- incorporating into your own company, selling to a family member's company, or selling to a company in which you retain an interest -- all attract scrutiny and come with specific restrictions. Any adviser recommending such a structure must navigate those restrictions carefully.

Planning Checklist

For sole traders or partners considering a business sale involving goodwill:

• Confirm BADR eligibility (two-year ownership, qualifying trade, full or part business disposal)
• Commission an independent goodwill valuation if the amount is significant
• Consider whether the TOGC VAT exemption applies
• Review whether the buyer can amortise the goodwill for tax purposes (affects their willingness to pay)
• Assess the timing of the disposal relative to personal income in the tax year (to manage CGT rates)
• Check whether any element of the proceeds might be treated as earn-out income in future years

For companies acquiring goodwill:

• Confirm whether the related-party restriction applies
• Confirm whether the IFA regime or CGT regime governs the acquired goodwill
• Assess the TOGC VAT position
• Obtain warranties covering HMRC's treatment of the goodwill in the seller's hands

Conclusion

Goodwill is a deceptively complex area of UK business taxation. The same asset -- the established reputation and customer base of a business -- can be taxed as a capital gain at 18% or as income at 45%, depending on the identity of the parties and the structure of the transaction.

For sellers, an arm's-length sale with BADR remains the most favourable outcome. For buyers, the goodwill purchase should be assessed not only on the purchase price but on whether it can be amortised for tax purposes. And for any transaction involving connected parties, professional tax advice is not optional -- the restrictions and HMRC's scrutiny of goodwill valuations make it a high-risk area without expert guidance.