Earnr AI, your new tax assistant, is here. Check it out now!
Stressed by tax?
Get Earnr Pro





The SA100 is the main Self Assessment form and it allows individuals to submit their personal income tax return. It is normally filed alongside another form.

More detail:

The SA100 is a type of tax form used in the United Kingdom by individuals to file their personal income tax returns. It is the main Self Assessment form.

Normally, another form is required for submission alongside a SA100 but that depends on who is submitting the form and why they are required to do so.

A SA100 form can be filed online or via post. For people that filed a tax return in the previous year, HMRC automatically sends them a form via email that they simply have to fill in and return to them.

It must be submitted by 31st October if you are filing via post but you have until 31st January of the following year if you are submitting the form online.

An example page of the SA100 from 2022/23 is shown below:

A photo of blank SA1 form from 2022/23
Back to Taxionary

You might also like...

decorative image for a blog

Submit your 22/23 Tax Return Before January 31st

January 31st is the deadline for submitting 2022/23 tax returns. It's a good idea to complete your tax return ahead of this deadline to avoid mistakes and potential penalties. This article shows why its a good idea to submit your tax return early and how Earnr can help you if you are stuck.

Read more
decorative image for a blog

We asked Earnr AI why you should use Earnr…. here’s what it said…

We recently introduced our newest addition to the Earnr team; our AI chat bot, Earnr AI. In this article we put Earnr AI to the test and asked it why you should use Earnr as your tax companion, bookkeeping tool and tax return assistant. Read it's excellent response!

Read more
decorative image for a blog
December 20, 2023
Tax essentials

Why should you submit your tax return over the Christmas period?

The festive period is often thought of as the busiest time of the year with the run up to Christmas and New Year. Whilst this period can feel hectic at times, it can also be seen as the perfect time to complete your tax return. In this article we explain why this Christmas time is the best time to submit your 22/23 tax return.

Read more
Earnr logoDownload earnr