Self-Assessment for Partnerships and LLPs

For UK partnerships and LLPs, Self-Assessment runs at two distinct levels. The partnership itself files an SA800 partnership return showing the trading profit and how it is allocated between partners. Each individual partner then files their own SA100 return including their share of partnership profit. Get either layer wrong and the whole structure is exposed to enquiry. The salaried members rules add a further layer of complexity for LLPs, recharacterising "partners" who lack genuine partnership economics as employees.

The SA800 partnership return

The partnership return:

• SA800: main partnership return showing trading profit, allocation across partners, capital introduced and withdrawn.
• SA801: pages for partnership rental income (UK property).
• SA802: foreign partnership income.
• SA803: partnership disposals (capital gains).
• SA804: partnership savings, investments and other income.

Filing deadline: 31 January following the tax year (online), 31 October (paper). Late filing penalty: £100 per partner. The nominated partner is responsible for the SA800 filing; individual partners are still responsible for their own SA100.

Profit allocation between partners

Profit allocation follows the partnership agreement:

1. 1Salary partners: fixed annual amount, taken from profit before residual allocation.
2. 2Interest on capital: percentage on capital balances, taken from profit before residual.
3. 3Residual profit: split per the profit-sharing ratio.
4. 4Each partner taxed on their allocated share regardless of cash drawings.

Salaried members rules: when an LLP partner is really an employee

The salaried members rules treat a member of an LLP as an employee for tax purposes if all three conditions apply:

• Condition A: at least 80% of remuneration is "disguised salary" (fixed amount unrelated to LLP profitability).
• Condition B: the member has no significant influence over the LLP's affairs.
• Condition C: the member's capital contribution is less than 25% of expected disguised salary.

Where all three apply, the member is taxed under PAYE on their remuneration, the LLP must withhold income tax and NI, and the LLP pays employer NI at 13.8%. For most professional services LLPs (law, accounting, consulting), genuine partners pass at least one of the tests. The risk sits in junior "salaried partner" tiers where capital contribution is minimal and remuneration is fixed.

Changing profit-sharing ratios

Changes to profit-sharing arrangements require care:

• Mid-year changes: profit allocated based on the period applicable to each ratio.
• New partner admission: partnership treated as continuing for tax purposes if at least one original partner remains; new partner taxed on share from admission date.
• Capital adjustments: where a new partner pays for a share of partnership goodwill, capital gains arise on the existing partners.
• Incoming partner's capital: not taxable for the partnership (capital, not income).

Work-in-progress on retirement

For professional services partnerships (law firms, accounting practices), work-in-progress (WIP) at the date of a partner's retirement creates a tax issue:

1. 1WIP at retirement date represents earned but unbilled fees.
2. 2Retiring partner is entitled to their share of the WIP under most partnership agreements.
3. 3WIP must be allocated to the retiring partner in their final tax year.
4. 4Cash payment may come over time as WIP is billed and collected; tax timing differs from cash timing.
5. 5For larger firms, retirement-date WIP can run six figures; tax planning with payment-deferral arrangements is common.

LLP vs traditional partnership

Capital contributions and drawings

Capital and drawings movements through the partnership ledger:

• Capital contributed by a partner: increases their capital account, not taxable income.
• Drawings: reduce capital account; not taxable (the underlying profit was taxed when allocated).
• Interest on capital: typically charged at an agreed rate, taxable on the receiving partner.
• Capital account at zero: subsequent drawings are still permissible but create a debit balance and create economic exposure.
• Loan from partnership to partner: interest must be at HMRC rate or treated as benefit; reportable.