The LLP at Twenty-Five: How a Profession-Built Hybrid Plateaued — and What ECCTA Now Changes

The Limited Liability Partnerships Act 2000 received Royal Assent on 20 July 2000 and came into force on 6 April 2001. As of last month, the LLP has been a feature of the UK register for a full quarter-century. It is a vehicle that arrived under political pressure, settled into a narrow professional niche, and has now begun to absorb the Economic Crime and Corporate Transparency Act 2023 (ECCTA) reforms in lockstep with limited companies — though never quite at the same pace, and never quite for the same reasons.

This is what twenty-five years of LLPs on the Companies House register actually look like, and where the ECCTA application work changes the filing map for the year ahead.

The political bargain that produced the vehicle

The LLP was not, in its original conception, a small-business tool. The 1996 consultation that became the LLP Act 2000 was driven by accountancy partnerships — principally the then-Big Five — who had been openly threatening to redomicile to Jersey, which had drafted a bespoke LLP statute at the firms' invitation. The Department of Trade and Industry's response was to keep the work onshore by writing a UK statute that gave partners limited liability while preserving the tax transparency of an ordinary partnership.

The statutory architecture reflects that origin. An LLP is a body corporate with separate legal personality (LLP Act 2000, s. 1(2)). It must have at least two members, of whom at least two are designated members (s. 8). It files at Companies House, not at HMRC's partnership tax office, and the public-facing filing regime is essentially the limited-company regime with the labels changed. The Limited Liability Partnerships (Application of Companies Act 2006) Regulations 2009 (SI 2009/1804) — the workhorse application instrument — applies large swathes of CA 2006 to LLPs, with adjustments. Confirmation statements, accounts, charges, strike-off, restoration, and the PSC regime all run through that instrument and its sibling regulations on accounts and audit.

A quarter-century in numbers

The pattern in incorporation data is the more interesting story. New-LLP volumes climbed sharply through the first decade, peaked in the run-up to the financial crisis, and have flattened ever since.

The active stock on the register has nonetheless grown steadily, because strike-off and dissolution volumes have run well below incorporation volumes for most of the period. By the end of 2024, Companies House was carrying somewhere in the region of 53,000 active LLPs against approximately 5.1 million companies. The LLP, in headcount terms, has remained a rounding error on the wider register — roughly 1 per cent of legal entities — but it carries a wildly disproportionate share of UK professional-services revenue.

Who actually uses an LLP

The SIC-code distribution on the LLP register is unusually concentrated. Three sectors account for the majority of the stock.

Catch-all classification — covered in earlier reporting on /sic-codes — is less of a problem here than it is on the limited-company side, because the LLPs that incorporate tend to be set up with the help of professional advisers who pick the right SIC code on the LL IN01. The data quality is, in relative terms, good.

The accounts regime — and the salaried members trap

LLPs prepare and file accounts under Part 15 CA 2006 as applied by the 2008 Accounts and Audit Regulations (SI 2008/1911), and report against the Statement of Recommended Practice for LLPs (the LLP SORP, last substantively revised in December 2021 and reissued for the 2024 changes). The audit threshold tests run on the standard limited-company numbers — turnover not exceeding £15m, balance-sheet total not exceeding £7.5m, and not more than 50 employees, after the April 2025 uplift covered in this publication's audit thresholds piece.

Where LLPs diverge from limited companies is at the tax interface. An LLP is tax-transparent: members are taxed individually on their profit share, and the LLP itself is not within the charge to corporation tax (ITTOIA 2005, s. 863). The catch is the salaried members rules introduced by Finance Act 2014 (now ITA 2007, ss. 863A–863G), which deem an individual member to be an employee for tax purposes — meaning PAYE and Class 1 NICs — if all three of these conditions are met:

1. Condition A — at least 80 per cent of the member's expected remuneration is "disguised salary" (fixed, or variable without reference to LLP profits).
2. Condition B — the member has no significant influence over the affairs of the LLP.
3. Condition C — the member's capital contribution is less than 25 per cent of expected disguised salary.

The rules were the first material brake on LLP growth and account for much of the flattening visible in the table above. HMRC's 2024 guidance refresh — following its loss in BlueCrest Capital Management (UK) LLP [2023] UKUT 232 (TCC) — narrowed the practical scope of Condition B, but the structural lesson held: an LLP is not a tax shelter for what would otherwise be an employment.

What ECCTA actually changes for LLPs

ECCTA itself does not directly amend the LLP Act 2000. It works through the LLP application regulations and through bespoke instruments — principally the Economic Crime and Corporate Transparency Act 2023 (Commencement No. 2 and Transitional Provision) Regulations 2024, and the application regulations laid in late 2024 and early 2025 that pulled the ECCTA changes into the LLP framework. The result is a near-complete read-across, with some delivery delays.

The practical bite for designated members of mid-sized LLPs is the identity-verification clock — the twelve-month transition for existing directors of limited companies runs in parallel for existing designated members of LLPs, with the same Authorised Corporate Service Provider (ACSP) intermediary route. Magic-circle firms and Big Four practices, which routinely have between sixty and several hundred designated members, are quietly working through verification batches with their internal compliance teams acting as in-house ACSPs.

The plateau, and why it matters

LLP incorporations are unlikely to recover to their pre-2008 peak. Three structural factors push the trend line down:

• Tax neutrality with companies. With the corporation tax main rate at 25 per cent and dividend tax in the upper bands at 39.35 per cent, the headline tax differential between an LLP and a Ltd-plus-dividend structure has narrowed materially. For most owner-managed businesses below the salaried members threshold, the tax case for an LLP is now a coin-flip.
• The salaried members rules, plus HMRC's increased appetite to look through capital contributions that look engineered.
• The compliance overhead of ECCTA is now identical for LLPs and limited companies. The historical "lighter-touch" feel of the LLP register is gone.

Against this, two factors keep the LLP register alive: the structural preference of regulated professional partnerships for a vehicle that mirrors their cultural model, and the continued use of LLPs as carry vehicles and joint-venture wrappers in private capital. Neither is a growth engine. Both are stable.

Twenty-five years in, the LLP has done what its 1996 architects asked of it. It kept the professions onshore. It absorbed limited-company filing reform without statutory rewrite. It is now a settled, narrow, well-understood corner of the register. Its second quarter-century is unlikely to be eventful — and for a Companies House vehicle, that is probably the highest compliment available.