UK LLP tax filing in 2025/26 has three parallel deadlines: the SA800 partnership return to HMRC by 31 January, each member's personal self-assessment by the same date, and the LLP's annual accounts at Companies House within 9 months of year-end. Missing any of these triggers automatic penalties — on the LLP, on each member individually, or both.

This guide walks through every filing deadline UK LLPs face, what each filing covers, the penalty structure, and the practical filing rhythm a well-run LLP follows.

The four annual filings every UK LLP makes

1. SA800 Partnership Tax Return (HMRC)

  • What it is: the LLP's annual partnership tax return showing total profit for the LLP and the allocation between members
  • Deadline: 31 January following the tax year (online) or 31 October following the tax year (paper)
  • Tax year basis: UK tax year runs 6 April to 5 April. For 2025/26 (ending 5 April 2026), SA800 is due by 31 January 2027
  • No tax payment with SA800: the LLP itself doesn't pay corporation tax. The tax is paid by each member on their personal SA
  • Filed by: typically the firm's accountant or the designated partner via HMRC's online portal or third-party software

2. Each Member's Personal Self-Assessment (HMRC)

  • What it is: each LLP member's personal tax return, including their share of LLP profit
  • Deadline: 31 January following the tax year (same as SA800)
  • Tax payment: any balance of tax due for the tax year, plus the first payment on account for the next year (50% of prior year's tax liability)
  • Second payment on account: 31 July after the tax year (the next 50%)
  • Filed by: each member individually (or their accountant on their behalf)

3. LLP Annual Accounts (Companies House)

  • What it is: financial statements showing the LLP's results and position
  • Deadline: 9 months after the accounting reference date (the LLP's year-end)
  • Format: full accounts, small LLP accounts (abridged), or micro-entity accounts depending on size
  • Audit threshold: turnover over £15m or balance sheet over £7.5m typically requires audit (same as for private limited companies)
  • Filed by: typically the firm's accountant via Companies House WebFiling or third-party software

4. LLP Confirmation Statement (Companies House)

  • What it is: annual confirmation of the LLP's information on the Companies House register (members, registered office, PSC details)
  • Deadline: annually on the anniversary of the LLP's incorporation
  • Cost: £34 online filing fee
  • Updates: any member changes during the year should be filed separately as they occur (LL AP02 to appoint, LL TM02 to terminate)

The 2025/26 filing calendar in practice

A typical UK LLP with a 31 March accounting reference date and tax year-end:

  • 31 March 2026: LLP year-end / UK tax year-end (close enough to 5 April for practical purposes)
  • April-September 2026: accountants prepare LLP accounts and SA800
  • By 31 July 2026: members make 2nd payment on account for 2024/25 tax year (50% of prior year's liability)
  • By 31 December 2026: LLP accounts filed at Companies House (9 months after 31 March 2026)
  • By 31 January 2027: SA800 filed with HMRC; each member's personal SA filed; members pay 2025/26 balance plus 1st payment on account for 2026/27
  • Annual confirmation statement: filed on incorporation anniversary

Penalty structure for late filing

Late SA800 penalties (HMRC)

  • 1 day late: £100 fixed penalty on the LLP plus £100 on each member
  • 3 months late: additional £100 on the LLP plus daily penalties of £10 per day per member (capped at 90 days = £900 per member)
  • 6 months late: further £300 or 5% of tax due (whichever greater) on the LLP plus same on each member
  • 12 months late: further £300 or 5% of tax due plus the same on each member; HMRC may apply additional discretionary penalties for deliberate non-filing

A 4-member LLP filing the SA800 six months late faces cumulative penalties of approximately £1,000 (LLP) plus £3,600+ (4 members × £900) plus £1,200 (LLP) plus £4,800 (4 members) = approximately £10,600 in penalties for a single late filing. The numbers escalate quickly.

Late LLP accounts penalties (Companies House)

Specific to LLPs (slightly different from private company rates):

  • Up to 1 month late: £150
  • 1-3 months late: £375
  • 3-6 months late: £750
  • More than 6 months late: £1,500

Doubled if accounts were also late in the previous year.

Late personal SA penalties (HMRC)

Standard self-assessment penalties apply to each member individually:

  • 1 day late: £100
  • 3 months late: additional £10 per day (up to £900)
  • 6 months late: £300 or 5% of tax due (whichever greater)
  • 12 months late: further £300 or 5%
  • Interest on unpaid tax: HMRC interest rate plus penalty interest, currently around 8% combined

What goes on the SA800

The SA800 partnership return is the LLP's headline tax document. Key contents:

  • Total partnership trading profit / loss for the tax year
  • Any UK property income, savings and investment income attributable to the LLP
  • Capital allowances claimed
  • Adjustments to profit (disallowed entertaining, depreciation add-back, capital allowances replaces depreciation)
  • Member-by-member allocation of the total profit, showing each member's share
  • Member-by-member capital movements if relevant
  • Notification of any changes in membership during the year

The SA800 is filed by the partnership (typically by the designated partner or the firm's accountant) but doesn't carry the tax payment — that's handled by each member on their personal SA.

What each member reports on their personal SA

Each LLP member's personal self-assessment includes:

  • Their share of LLP profit as shown on the SA800 allocation
  • Qualifying loan interest relief on any loan used to fund LLP capital contribution (ITA 2007 s.398)
  • Any personal pension contributions claimed for higher-rate / additional-rate relief above basic rate
  • Gift Aid donations for relief at the member's marginal rate
  • Other income (employment, rental, dividends, savings, capital gains)
  • Total tax calculation based on all income sources, with payments on account taken into account

The personal SA is where the tax actually crystallises. Each member's marginal rate (20% / 40% / 45%) applies to their share of LLP profit; Class 4 NI (6% / 2%) applies on top.

FA 2014 Salaried Member implications

If any LLP members are caught by the FA 2014 Salaried Member Rules (deemed employee for tax — Conditions A + B + C all met), their treatment changes:

  • PAYE applies on their drawings during the year
  • They don't appear on the SA800 allocation as a normal member
  • The LLP must operate payroll on their drawings (with employer NI on top)
  • The deemed-employee member typically still files an SA covering their salary plus any other income

The quarterly FA 2014 audit catches drift in the position. See our partnership vs LLP pillar guide for mechanics.

Common LLP filing errors

Missing the SA800 deadline because everyone assumed someone else was filing

Responsibility for filing isn't always clearly assigned. The designated partner is the named person for HMRC communications but in practice the accountant typically files. If there's been a recent change in accountant or designated partner, the SA800 can slip. Cumulative penalties on an LLP and all members materially exceed the cost of just filing on time.

Filing SA800 with wrong member allocations

The SA800 allocation must match the LLP agreement and what each member actually reports on their personal SA. Mismatches trigger HMRC enquiries. Common error: a partner left mid-year and the SA800 doesn't reflect the leaving date correctly.

Companies House accounts filed in wrong format

Small LLPs can file abridged accounts; mid-sized LLPs must file full accounts. Filing the wrong format triggers Companies House rejection and the LLP has to refile — sometimes with the deadline running. Get the size category right at the start of the filing process.

Capital movement reporting

Member capital movements (contributions, withdrawals, exits) need to be reported on the SA800 in some years. Forgetting to include these can trigger HMRC enquiries when the next year's accounts show capital changes without prior disclosure.

The well-run LLP filing rhythm

A typical disciplined LLP accountant runs the cycle:

  • Months 1-3 after year-end: management accounts finalised; provisional SA800 prepared
  • Months 3-5: full LLP accounts prepared; audit if needed
  • Months 5-6: SA800 finalised; partner allocations confirmed; provisional personal SA figures circulated to members
  • Months 6-7: Companies House LLP accounts filed
  • Months 7-9: each member finalises personal SA with any additional personal income; SA filings completed well ahead of January deadline
  • By 31 January: all members have paid their tax balance plus first payment on account; SA800 filed

This rhythm completes all filings 4-6 weeks ahead of the deadlines, avoiding January overload.

What we'd do if you brought us in

Our LLP compliance engagement covers:

  • SA800 partnership return prepared and filed annually well ahead of the 31 January deadline
  • Companies House LLP accounts prepared and filed within 9 months of year-end
  • Each member's personal SA prepared with their share of partnership profit, qualifying loan interest, pension contributions and other reliefs
  • FA 2014 Salaried Member quarterly audit for fixed-share / salaried members
  • Capital account tracking for each member, with annual statements showing capital movements and current balance

The compliance work is largely mechanical once the systems are in place. Most penalties for late LLP filing come from accountant churn or from firms self-filing without proper process. A specialist accountant on the file means the deadlines are simply met.

Book a 30-minute scoping call below if your LLP is approaching year-end and you want the filing rhythm onto specialist hands.