A partner in a partnership should complete an individual Self Assessment tax return each year. This can be submitted online, or using a postal return. If a partner decides to submit a paper SA100 return through the post, they must also complete a SA104 form about income earned by the partnership.
What is included on an SA104 form?
An SA104 form is a supplementary page to your paper tax return SA100 form. It’s where you declare your share of any profits or losses from the partnership. This information will also be included in the partnership’s tax return.
You might also need to include other supplementary pages if you have other income, such as rental income or from employment. If you file your Self Assessment tax return online, your return will be tailored to make sure you only complete relevant sections.