Updated on 6 April 2026

Partnerships

If you don’t want to run your business as a sole trader or a limited company, then you might decide to run the business in partnership with others. This page explains what a partnership is and the tax issues partnerships should be aware of.

Four people each holding a piece of jigsaw puzzle together, each piece will fit into the next perfectly.
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Content on this page:

Introduction

A partnership (or firm, if you are based in Scotland) is an entity which can be used to run a business with a view to making a profit. The partners, who can be either individuals or companies or Limited Liability Partnerships, personally share responsibility for their business. Although a partnership can be formally set-up using a partnership agreement, it is also possible to be run informally through a verbal understanding between all the partners.

Apart from in Scotland, a partnership is not a separate legal entity like a limited company. Scottish partnerships are a separate legal entity and can own property in their own right. 

There is no limit on the number of partners there can be in a partnership. 

This page focuses on simple partnerships where all the partners are individuals who are not earning a salary from the partnership as well as a share of the partnership’s profits. However, some partnerships can be complex because of factors such as partners joining or leaving, partners adding capital (investing money) into the partnership, changing the profit-sharing ratios of the partnership or having a partner which is not an individual (such as a limited company). For more complicated partnerships you should consider obtaining professional advice. 

The main tax areas partners should be aware of when running a simple partnership are:

  1. A partnership must be registered with HMRC.
  2. The partnership’s taxable profits or losses should be allocated to the partners according to the profit-sharing agreement.
  3. A partnership tax return (SA800) must be completed as well as individual tax returns for each partner.
  4. The partnership does not pay tax in its own right, instead the partners are taxed individually.

We cover these four tax areas in more detail under the relevant headings below.

Registration

The partnership needs to register with HMRC as well as the individual partners. We cover registration for self assessment for individuals on our page Self-employment: registering for tax and National Insurance contributions . As part of the registration process, one of the partners in the partnership must be named as the nominated partner. The nominated partner is responsible for completing and filing the partnership tax return and maintaining business records for tax purposes.

The partnership can be registered either online (you will need government gateway log in details for the partnership to be able to do this) or by using a paper form (SA400). The deadline to register the partnership is the same as for individuals. 

Allocation of profits or losses

The partnership will need to prepare accounts and allocate any taxable profits or losses according to the profit-sharing ratio, which should be included in the partnership agreement if there is a formal agreement.

So, if there are four equal partners, each will be allocated a quarter share of the taxable profits (or losses).

The tax rules for preparing accounts for a partnership are generally similar to those when you are self-employed. 

After calculating the partnership’s profits, the profits are allocated as per the profit-sharing ratio. This is illustrated in the example, under the heading Paying tax below. The profit-sharing ratio cannot be varied retrospectively after the end of the tax year.

Tax returns

If you run your business through a partnership, then the partnership will need to complete a partnership tax return as well as each individual partner filing individual tax returns. For tax years up to and including the 2025/26 tax year, partners must complete individual self assessment tax returns.

From April 2026, some individuals who are self-employed or receive property income must report their tax information using Making Tax Digital for Income Tax.  Income from a partnership itself is currently not including as qualifying income when considering if you must use Making Tax Digital. If you do not need to use Making Tax Digital then you will continue to complete an individual self assessment tax return.

As explained under the heading Registration above, the nominated partner for the partnership is responsible for completing and filing the partnership tax return (SA800). It is not possible to complete and file a partnership tax return using HMRC’s free online service so if you do not want to purchase commercial software then you will need to complete a paper tax return. If a partnership paper tax return is not received from HMRC it can be found, with a guide on how to complete it, on GOV.UK.

The filing deadlines for a partnership tax return are the same as for an individual’s self assessment tax return whether you file a paper tax return or an online return. If the partnership tax return is filed after the deadline then late filing (submission) penalties will be charged to each partner.

The nominated partner is responsible for the filing of the partnership tax return, and the individual partners are responsible for filing their own individual tax returns. This is covered in the example under the heading Paying tax below.

Paying tax

The partnership itself does not pay tax or National Insurance contributions. As mentioned under the heading, Allocation of profits or losses above, the partners are allocated a share of the profit or loss from the partnership based on the profit-sharing ratio. Tax and self-employed National Insurance contributions will be calculated on an individual basis for each partner, with the payment dates following the self assessment rules.

The example below illustrates how the profits are allocated between individual partners and how the tax is calculated for each partner.

Example – calculating tax on partnership profits  

Andrea, Bronagh and Cerys, who all live in England, run a partnership called ABC, with an accounting year ending on 5 April. Andrea, Bronagh and Cerys do not have a written partnership agreement but have always split the profits on a 50:25:25 basis to reflect the amount of work each of them do.

During the 2025/26 tax year, the ABC partnership made taxable profits of £37,500. This will be allocated as follows:

  • Andrea: £18,750 (£37,500 x 50%)
  • Bronagh: £9,375 (£37,500 x 25%)
  • Cerys: £9,375 (£37,500 x 25%)

Andrea is the nominated partner for the ABC partnership so she will be responsible for preparing and submitting the 2025/26 partnership tax return. Andrea decides to file a partnership paper tax return which must be submitted by 31 October 2026.

Pages six and seven on the partnership paper tax return (SA800) includes details of the individual partners such as their unique taxpayer reference and National Insurance number, as well as their allocation of profit or loss from the partnership. Once the partnership return has been completed, Andrea will provide this information to Bronagh and Cerys so they can include their share of the partnership’s profit on the partnership pages (SA104S or SA104F) - or in the partnership section, if filing online - of their own 2025/26 self assessment tax returns. 

Andrea

Andrea decides to file her 2025/26 tax return online and will include profits from the partnership of £18,750 in the partnership section of her self assessment tax return. She will have until 31 January 2027 to submit her return on time.

As this is Andrea’s only taxable income during the 2025/26 tax year, she will have income tax of  £1,236 (£18,750 less £12,570 personal allowance = £6,180 at 20% basic rate tax). 

Andrea will also pay Class 4 National Insurance contributions of £370.80 (£18,750 less £12,570 Class 4 lower profits limit = £6,180 x 6%). 

In total, Andrea will owe £1,606.80 for income tax and National Insurance contributions in the 2025/26 tax year.

Bronagh

Bronagh does not have any other taxable income and will include her share of profits from the partnership of £9,375 on the partnership pages of her own tax return using the information Andrea has provided. Bronagh wants to file a paper tax return so that HMRC can calculate her tax and National Insurance contributions. She will need to submit her paper tax return by the filing date of 31 October 2026. 

HMRC calculates that Bronagh has no income tax or Class 4 National Insurance contributions due for the 2025/26 tax year as her share of the partnership’s profits are below the personal allowance (£12,570) and Class 4 lower profits limit (£12,570). Bronagh’s share of partnership profits are between the small profits threshold (£6,845) and the lower profits threshold (£12,570) so there are no Class 2 National Insurance contributions to pay, instead she will be treated as making Class 2 National Insurance payments. 

Cerys

As well as having profits from the partnership of £9,375, Cerys also has profits from self-employment from a different business of £14,000. Cerys submits an online 2025/26 self assessment tax return before the 31 January 2027 deadline showing total taxable income of £23,375 (£9,375 + £14,000). 

Her tax is calculated as £2,161 (£23,375 less £12,570 personal allowance = £10,805 at 20% basic rate of tax). 

Cerys will also pay Class 4 National Insurance contributions of £648.30 (£23,375 less £12,570 Class 4 lower profits limit = £10,805 x 6%). 

In total, Cerys will owe £2,809.30 for income tax and National Insurance contributions in the 2025/26 tax year.

 Also, as Cerys has self-employment income she has qualifying income for the purpose of Making Tax Digital for income tax of £14,000 for 2025/26. This is below the relevant Making Tax Digital threshold so she will not have to use Making Tax Digital until at least April 2028 at the earliest.

More information

There is information on GOV.UK about setting up a partnership.

There is guidance in HMRC’s partnership manual about Scottish partnerships and how to treat losses.

Our page Trading income: basis period reform covers how the new basis period reform rules could affect partners in partnerships. 

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