How Do Tax and SRA Rules Work When Merging Two UK Law Firms?

Merging two law firms is a significant strategic decision, and it is a tax decision and a regulatory decision at the same time. Both have to be satisfied before completion, not after. This guide explains the tax treatment of goodwill and work in progress, how to choose the structure of the merged firm, the SRA authorisation and notification steps, transferring the client account under the SRA Accounts Rules, and keeping professional indemnity cover continuous.

Why Law Firms Merge

Firms merge to expand into new practice areas, to extend geographic reach, to share overhead and back-office cost, or to secure succession where the equity is ageing and there is no internal buyer. A merger can also strengthen the firm's position with lenders and insurers. None of those benefits survives a poorly handled tax or regulatory step, so the planning has to come first.

Tax Treatment of Goodwill in a Law Firm Merger

Goodwill is usually 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 a capital asset. When a partner or member disposes of their share of the firm's goodwill to the merged entity, that disposal realises a capital gain charged to Capital Gains Tax (CGT), not income tax, and is reported on the capital-gains pages.

The CGT rate depends on the individual's circumstances. For the 2025/26 tax year the standard rates are 18% on gains within the basic-rate band and 24% on gains above it, applying to all chargeable assets including goodwill, after the annual exempt amount of £3,000. Business Asset Disposal Relief (BADR) can reduce the rate on qualifying gains up to a £1 million lifetime limit to 14% for disposals between 6 April 2025 and 5 April 2026, rising to 18% from 6 April 2026, provided the individual has met the qualifying conditions throughout the two years to disposal. The step up to 18% from 6 April 2026 is a live planning point for any merger expected to complete late in the 2025/26 tax year.

The amortisation position on the buying side matters too. Goodwill acquired between 8 July 2015 and 31 March 2019 does not qualify for tax relief on amortisation. Goodwill acquired on or after 1 April 2019, as part of a business that also includes qualifying intellectual property, can attract fixed-rate relief at 6.5% per year for the acquiring company, capped at six times the qualifying IP spend. That relief is restricted where the goodwill is acquired from a related party, for example where partners transfer their existing practice into their own new company, so it cannot be assumed on a self-incorporation. This distinction shapes how the merger consideration is best structured.

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 and is transferred to the merged LLP, so the sole practitioner realises a capital gain of £300,000. After the annual exempt amount of £3,000 in 2025/26, the chargeable gain is £297,000. If BADR applies in the 2025/26 band, the CGT is £41,580 (14% of £297,000). Without BADR, on a gain falling in the higher band, it would be £71,280 (24% of £297,000). The same gain realised on or after 6 April 2026 would attract BADR at 18%, so the timing of completion changes the bill.

Whether the merged LLP can then claim relief on the acquired goodwill depends on the dates and the related-party position above, so the acquisition side should be modelled separately rather than assumed.

Work in Progress, Debtors and Capital Accounts

Goodwill is capital, but a firm's work in progress (WIP) and debtors are trading income. If they are brought into account as part of the merger, they are taxed at income-tax rates (plus Class 4 National Insurance for individual partners), not at CGT rates. The merger agreement therefore has to split the consideration clearly between goodwill (capital) and WIP and debtors (income). Law firms recognise WIP under FRS 102, so unbilled time already sits on the balance sheet and is taxed as it is recognised. Partner capital accounts on each side must be reconciled and settled, and where a partner borrows to fund a capital contribution to the merged firm, qualifying loan interest relief under ITA 2007 ss.398 to 412 may be available while they remain a partner and the capital stays in.

SRA Authorisation and Notification for the Merger

The regulatory route depends on the legal mechanics of the deal. If the two firms simply combine into one of the existing SRA-authorised entities, the surviving firm notifies the SRA of the changes to its managers, owners and the individuals holding the COLP and COFA roles, and updates its authorisation details. If the merger creates a new legal entity, for example a new LLP or limited company, that entity must apply for and obtain SRA authorisation as a recognised body before it can practise. You cannot trade the new entity on the assumption that authorisation will follow.

If the merged firm will have any non-lawyer owner or manager, it must be licensed as an Alternative Business Structure (ABS) under Part 5 of the Legal Services Act 2007, with the SRA acting as licensing authority. Non-lawyer owners and managers must pass the SRA's suitability assessment. In every case the merged firm needs a designated COLP (Compliance Officer for Legal Practice) and COFA (Compliance Officer for Finance and Administration) who meet the SRA's requirements.

Practical regulatory steps for a merger include:

• Confirming early whether the deal needs SRA authorisation of a new entity, an ABS licence, or only a notification of changes, and treating any required approval as a completion condition.
• Applying for authorisation of any new entity well before the target completion date, so practising is not interrupted.
• Designating and registering the merged firm's COLP and COFA and updating practising certificate and manager details.
• Reviewing compliance with the SRA Accounts Rules across the combined client account before and after the transfer.

For the underlying client-money framework, see our SRA Accounts Rules Essentials guide.

Transferring the Client Account and Client Files

Client money is never the firm's income, and it stays the clients' money throughout a merger. Moving client balances and ledgers from the pre-merger firms into the merged firm's client account is a regulated exercise under the SRA Accounts Rules 2019, not an internal book transfer. Client money must be held in a separate client account at a bank or building society branch in England and Wales; every payment in, transfer or withdrawal must relate to the delivery of regulated services (Rule 3.3, the banking-facility prohibition); the account must be reconciled at least every five weeks, signed off by the COFA or a manager (Rule 8.3); and the firm must account to clients for a fair sum of interest on balances held (Rule 7).

In practice that means planning the client-account transfer with a clear audit trail, reconciling both firms' ledgers immediately before and after the move, transferring matter files and the relevant client balances together, and confirming whether an accountant's report is due for the period. Client money is tax-neutral, so the transfer creates no income or VAT charge in itself, but a handling error is an SRA Accounts Rules breach. The COFA carries primary responsibility for getting it right.

Professional Indemnity Insurance Continuity

Professional Indemnity Insurance (PII) is a central concern in any law firm merger. The merged firm must hold PII that meets the SRA's Minimum Terms and Conditions. The minimum sum insured is £3 million per claim for a recognised or licensed body such as an LLP, company or ABS, and £2 million per claim in other cases such as sole practitioners and traditional partnerships, with no monetary limit on defence costs.

There are two common approaches to continuity of cover:

• Run-off cover: the pre-merger firms maintain separate run-off policies for work done before the merger, while the merged firm takes out a new policy for post-merger work. SRA run-off cover runs for six years.
• Single successor-practice policy: the merged firm negotiates one policy that covers all work, including pre-merger matters, where the insurer agrees to take on the prior risk.

Insurers assess the merged firm's risk profile, including the combined claims history of both firms, so a poor claims record on either side can affect availability and terms. Involve a specialist insurance broker early, before completion, so the cover is confirmed rather than assumed. For how premiums are treated for tax, see our Professional Indemnity Tax Treatment guide.

Choosing the Structure of the Merged Firm

The merged firm can be a general partnership, an LLP, or a limited company (including an ABS). The choice drives both the tax outcome and the regulatory authorisation, and the two have to be answered together.

Partnership or LLP

General partnerships and LLPs are tax-transparent. The firm pays no corporation tax on its trading profit; instead each partner or member is taxed personally on their allocated profit share at their own marginal rates, plus Class 4 National Insurance. This is the structure most solicitors know, and it avoids the layer of corporation tax. An LLP still needs SRA authorisation as a recognised body, and members should be aware of the salaried member rules, which can re-classify a fixed-share or salaried member as an employee for tax where all three statutory conditions are met. See our guide on how LLP members are taxed for the detail.

Limited Company

A limited company pays corporation tax at 19% on profits up to £50,000 and 25% on profits above £250,000, with marginal relief between those thresholds. The solicitors become employees and shareholders and extract profit through salary and dividend. Dividends are taxed for 2025/26 at 8.75% (ordinary rate), 33.75% (upper rate) and 39.35% (additional rate), with a £500 dividend allowance. From 6 April 2026 the ordinary rate rises to 10.75% and the upper rate to 35.75%, while the additional rate stays at 39.35%. Because the 2026/27 dividend rise narrows the gap, incorporation is not a flat tax win at typical partner profit levels: the company route can suit a firm retaining significant profit for reinvestment, but profit extraction is often less efficient than a partnership profit share once the personal position is included.

Use our Partnership vs LLP Take-Home Calculator to compare the structures on your own figures, and see our guide on converting a law firm to a limited company or ABS.

VAT Implications of the Merger

Legal services are standard-rated for VAT at 20%, so VAT is a real cost to get right on a merger. Where both firms are VAT-registered, the combination of the businesses can qualify as a transfer of a going concern (TOGC). A TOGC is not a taxable supply, so no VAT is charged on the transfer of the assets and goodwill, provided the conditions are met:

• The assets are used by the transferee in carrying on the same kind of business.
• The transferee is VAT-registered, or becomes registered as a result of the transfer.
• The transferor ceases that business.
• There is no significant break in trading.

If the TOGC conditions are not met, VAT at 20% can be due on the transfer of assets and goodwill, which materially increases the cost of the merger. A share sale of an incorporated firm is a different position again and is outside the scope of VAT. Take specialist VAT advice on the mechanics before completion.

Practical Steps for Solicitors Considering a Merger

Before proceeding, solicitors should:

• Engage a legal-sector-specialist accountant to model the tax outcome of each structure and the timing of any goodwill disposal.
• Instruct a solicitor experienced in law firm mergers to draft the merger agreement, allocate the consideration between goodwill and WIP, and handle the SRA authorisation or notification.
• Confirm PII cover with a specialist broker before completion.
• Conduct financial due diligence on the other firm's accounts, WIP and lock-up, debtor position, and claims history.
• Plan the client-account transfer and file novation, with a full reconciliation and audit trail.

For a wider view of bringing the two firms together after completion, see our Post-Merger Integration guide.

Common Tax Pitfalls in Law Firm Mergers

Several issues catch solicitors off guard:

• Mixing capital and income: if the consideration does not clearly split goodwill (capital) from WIP and debtors (income), part of what should be a capital gain can be taxed as income at higher effective rates.
• Assuming goodwill relief: the acquiring company's 6.5% relief is limited to post-1-April-2019 acquisitions with qualifying IP and is restricted on related-party transfers, so it should be confirmed, not assumed.
• Partner capital and loan interest: where partners borrow to fund a capital contribution to the merged firm, the availability of qualifying loan interest relief under ITA 2007 ss.398 to 412 should be checked before drawing the funds.
• Salaried member rules: if the merged firm is an LLP, the salaried member rules (FA 2014, ITTOIA 2005 ss.863A to 863G) must be reviewed for fixed-share and salaried members, because a member who meets all three conditions is taxed as an employee with PAYE on their reward.

For more on the structure choice, see our Partnership vs LLP for Solicitors guide, and on the underlying transaction mechanics our guide on asset sale versus share sale.

Conclusion

Merging two law firms can create real value, but the tax and regulatory work has to be done up front. Goodwill and CGT, the WIP and income split, the structure of the merged firm, SRA authorisation, the client-account transfer and PII continuity all need to be settled before signing. The outcome turns on the specific facts, including the firms' structures, how the consideration is allocated, and each partner's personal tax position. Speak to an accountant who understands law firm mergers, and the SRA framework that sits alongside the tax, before agreeing terms.