Merging two law firms is a significant strategic decision. The tax implications, SRA consent requirements, and practical integration steps are often underestimated. This guide explains the key tax and regulatory considerations for UK solicitors planning a firm merger.

Why Merge Two Law Firms?

Law firms merge for several reasons: to expand into new practice areas, to increase geographic reach, to share overhead costs, or to secure succession. A merger can also strengthen the firm's bargaining power with lenders and insurers. However, the tax and regulatory consequences must be addressed before the deal is signed.

Tax Treatment of Goodwill in a Law Firm Merger

Goodwill is often the most valuable intangible asset in a law firm merger. It represents the firm's reputation, client relationships, and referral network. For tax purposes, goodwill is treated as a capital asset. When one firm transfers its goodwill to the merged entity, the disposing firm may realise a capital gain subject to Capital Gains Tax (CGT).

The rate of CGT depends on the individual solicitor's circumstances. For the 2025/26 tax year, the basic rate is 18% and the higher rate is 24%. Business Asset Disposal Relief (BADR) may apply, reducing the rate to 14% in 2025/26 (rising to 18% from 6 April 2026). BADR is available if the solicitor has owned the business for at least two years and meets the other conditions.

Goodwill acquired after 8 July 2015 but before 1 April 2019 does not qualify for tax relief on amortisation. Goodwill acquired on or after 1 April 2019 can be amortised at 6.5% per year for tax purposes. This distinction matters when structuring the merger consideration.

Example: Goodwill Transfer in a Merger

Firm A (a sole practitioner) merges with Firm B (a two-partner LLP). Firm A's goodwill is valued at £300,000. Firm A transfers its goodwill to the merged LLP. The sole practitioner realises a capital gain of £300,000. After the annual exempt amount (£3,000 in 2025/26), the gain is £297,000. If BADR applies, the tax bill is £41,580 (14% of £297,000). Without BADR, the bill would be £71,280 (24% of £297,000).

The merged LLP can then amortise the goodwill at 6.5% per year (£19,500 per year) against its taxable profits, reducing the partners' overall tax liability over time.

The SRA does not require formal "consent" for a law firm merger in the same way it does for a change of ownership. However, the merged firm must notify the SRA of the change in structure. If the merger creates a new legal entity (for example, a new LLP or limited company), the new entity must apply for SRA authorisation.

If the merger involves an Alternative Business Structure (ABS), the SRA must approve the new ownership structure. Non-solicitor owners must pass the SRA's fit and proper test. The COLP and COFA roles must be assigned to individuals who meet the SRA's suitability requirements.

Practical steps for SRA compliance include:

  • Notifying the SRA of the merger within 28 days of completion.
  • Updating the firm's SRA registration details, including the practising certificate holders.
  • Ensuring the merged firm's COLP and COFA are designated and registered.
  • Reviewing the SRA Accounts Rules to confirm the merged firm's compliance with client account rules.

For detailed guidance on SRA compliance, see our SRA Accounts Rules Essentials guide.

PII Continuity During and After the Merger

Professional Indemnity Insurance (PII) is a critical concern in any law firm merger. The merged firm must hold PII that meets the SRA's Minimum Terms and Conditions (MTC). The minimum cover is £2 million per claim (£3 million for sole practitioners or partnerships).

There are two common approaches to PII continuity:

  • Run-off cover: The pre-merger firms maintain separate run-off policies for work done before the merger. The merged firm takes out a new policy for post-merger work.
  • Single merged policy: The merged firm negotiates a single policy that covers all work, including pre-merger work. This is often more cost-effective but requires the insurer's agreement.

Insurers will assess the merged firm's risk profile, including the combined claims history of both firms. A firm with a poor claims record may struggle to obtain affordable cover. It is essential to involve a specialist insurance broker early in the merger process.

For more on PII tax treatment, see our Professional Indemnity Tax Treatment guide.

Tax Structure of the Merged Firm

The merged firm can be structured as a general partnership, an LLP, or a limited company. Each has different tax consequences.

Partnership or LLP

Partnerships and LLPs are tax-transparent. The merged firm does not pay corporation tax. Each partner is taxed on their share of the merged firm's profits at their personal marginal rates. This structure is familiar to most solicitors and avoids double taxation.

Limited Company

A limited company pays corporation tax at 19% to 25%. The solicitors become employees and shareholders. Dividends are taxed at 8.75% (basic rate), 33.75% (higher rate), or 39.35% (additional rate). This structure may be attractive if the merged firm expects to retain significant profits for reinvestment. However, extracting profits as dividends is less tax-efficient than partnership profit shares for most solicitors.

Use our Partnership vs LLP Take-Home Calculator to compare the tax outcomes for your specific circumstances.

VAT Implications of the Merger

If both firms are VAT-registered, the merger may trigger a transfer of a going concern (TOGC) for VAT purposes. A TOGC is not a taxable supply, so no VAT is charged on the transfer of assets and goodwill. The conditions for TOGC treatment include:

  • The assets are used in the same type of business.
  • The transferee (merged firm) is VAT-registered or becomes VAT-registered.
  • The transferor (pre-merger firm) ceases its business.
  • No significant break in trading.

If the TOGC conditions are not met, VAT at 20% may be due on the transfer of assets and goodwill. This can significantly increase the cost of the merger. Seek specialist VAT advice.

Practical Steps for Solicitors Considering a Merger

Before proceeding, solicitors should take the following steps:

  • Engage a legal-sector-specialist accountant to model the tax outcomes of different structures.
  • Instruct a solicitor experienced in law firm mergers to draft the merger agreement and handle SRA notifications.
  • Review PII arrangements with a specialist broker.
  • Conduct due diligence on the other firm's financial position, WIP, and claims history.
  • Plan the integration of systems, client files, and staff.

For a comprehensive overview, see our Post-Merger Integration guide.

Common Tax Pitfalls in Law Firm Mergers

Several tax pitfalls can catch solicitors off guard:

  • Goodwill double taxation: If the merger is structured as an asset purchase rather than a share purchase, goodwill may be taxed twice (once on the seller and again on the buyer if amortisation is restricted).
  • WIP valuation: Work in progress (WIP) must be valued on an earnings basis under FRS 102. The merged firm must recognise the WIP at fair value. This can create a tax charge if the WIP is treated as a disposal.
  • Partner capital accounts: If partners contribute capital to the merged firm, the tax treatment of borrowing to fund the contribution must be considered. Qualifying loan interest relief under ITA 2007 s.398 may be available.
  • Salaried member rules: If the merged firm is an LLP, the Salaried Member Rules (FA 2014) must be reviewed. Any member who meets all three conditions (disguised salary, limited influence, insufficient capital) will be treated as an employee for tax purposes, with PAYE applied to their drawings.

For more on LLP structures, see our Partnership vs LLP for Solicitors guide.

Conclusion

Merging two law firms can create significant value, but the tax and regulatory landscape is complex. Goodwill treatment, SRA consent, PII continuity, and VAT implications all require careful planning. Engaging a legal-sector-specialist accountant early in the process is essential to avoid costly mistakes.

Every merger is unique. The tax outcomes depend on the specific facts, including the firms' structures, the merger consideration, and the partners' personal tax positions. Speak to a specialist accountant who understands law firm mergers before signing any agreement.