Key facts
- A partnership itself does not pay National Insurance — each partner pays individually.
- Each partner pays Class 2 NI (flat rate) and Class 4 NI (percentage of profits) through Self Assessment.
- The profit share allocated to each partner forms the basis for their NI calculation.
- Partners are treated as self-employed, not as employees of the partnership.
How NI Works in a Partnership
A partnership is a business structure where two or more people carry on a trade together. For National Insurance purposes, each partner is treated as an individual self-employed person. The partnership itself has no NI liability.[2]
This means:
- Each partner registers individually with HMRC as self-employed
- Each partner files their own Self Assessment tax return
- Each partner pays their own Class 2 and Class 4 NI
- The partnership also files a separate partnership tax return (SA800) showing total income and each partner’s share
Key distinction: Partners are not employees of the partnership. They cannot be put on PAYE and do not pay Class 1 NI. Even if a partner draws a regular “salary,” this is treated as drawings against their profit share, not employment income.[4]
NI Classes for Partners
Each partner pays two classes of National Insurance on their share of the partnership profits:[1]
| Class | Rate (2026/27) | Basis |
|---|---|---|
| Class 2 | £3.65 per week (flat rate) | Payable if profits above £7,105 (Small Profits Threshold) |
| Class 4 (main rate) | 6% | On profits between £12,570 and £50,270 |
| Class 4 (additional rate) | 2% | On profits above £50,270 |
Calculating the Profit Share
The partnership agreement determines how profits are divided among partners. Common methods include:[3]
- Equal shares — profits split equally between all partners
- Fixed ratios — each partner gets a set percentage (e.g. 60/40)
- Salary plus share — partners receive a “salary” (a prior allocation) before remaining profits are split
- Interest on capital — partners receive interest on their capital contribution, then remaining profits are split
The profit share determines NI. Whatever share is allocated to each partner on the partnership return is the amount on which their Class 4 NI is calculated. Partners cannot reallocate profits after the fact to reduce NI.
Worked Example
Example: A two-person partnership earns £80,000 profit in 2026/27, split equally.
- Each partner’s share: £40,000
- Class 2 NI: £3.65 × 52 = £189.80 each
- Class 4 NI: (£40,000 − £12,570) × 6% = £27,430 × 6% = £1,645.80 each
- Total NI per partner: £189.80 + £1,645.80 = £1,835.60
The Partnership Tax Return
The nominated partner (or a tax agent) files the SA800 partnership return, which reports:[3]
- Total partnership income and expenses
- The net profit or loss
- How profits are allocated among partners
- Each partner’s name, UTR, and NI number
Each partner then reports their allocated share on their individual Self Assessment return (SA100), where Class 2 and Class 4 NI are calculated alongside Income Tax.
New and Departing Partners
When a partner joins or leaves mid-year:
- Profits are apportioned for the period the partner was active
- The departing partner pays NI on their share for the period they were a partner
- The new partner pays NI on their share from the date they joined
- Overlap relief rules may apply for the new partner’s first year (similar to sole traders)
Salaried Partners
Since 2014, some partners may be reclassified as “salaried partners” for tax purposes if they meet all three conditions:[4]
- They receive a fixed amount regardless of the partnership’s profits
- They don’t have significant influence over the partnership’s affairs
- Their capital contribution is less than 25% of their expected income from the partnership
Salaried partners are treated as employees for tax and NI purposes — the partnership must operate PAYE and pay employer’s NI (15%) on their income. This can significantly increase the partnership’s costs.
Limited Partnerships and LLPs
Members of a Limited Liability Partnership (LLP) are generally treated the same as partners in a traditional partnership for NI purposes — each member pays Class 2 and Class 4 individually. The salaried partner rules also apply to LLP members.[2]
Frequently Asked Questions
Does a partnership pay National Insurance as an entity?
No. A partnership is transparent for NI purposes. Each individual partner is responsible for paying their own Class 2 and Class 4 NI based on their share of the partnership profits.
What NI classes do partners pay?
Partners pay Class 2 NI (a flat weekly rate of £3.65 in 2026/27) and Class 4 NI (6% on profits between £12,570 and £50,270, plus 2% above £50,270). Both are collected through each partner’s Self Assessment return.
How is each partner’s NI calculated?
The partnership prepares a partnership tax return showing total profits and each partner’s allocated share. Each partner then includes their share on their personal Self Assessment return, where Class 2 and Class 4 NI are calculated.
What if a partner also has employment income?
If a partner is also employed elsewhere, they pay Class 1 NI on their employment earnings through PAYE, plus Class 2 and Class 4 on their partnership profits through Self Assessment. An annual maximum prevents overall overpayment — they can apply for deferment if needed.
Further Reading
- Class 2 NI: Rates & Thresholds — detailed Class 2 guide
- Class 4 NI: Rates & Thresholds — detailed Class 4 guide
- Paying NI Through Self Assessment — how NI is collected
- NI Deferment — if a partner also has employment income
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Sources
- Self-employed National Insurance rates — GOV.UK
- Set up a business partnership — GOV.UK
- File your partnership tax return — GOV.UK
- National Insurance: introduction — GOV.UK