Hi DLEK,
The self assessment criteria tool at
Check if you need to send a Self Assessment tax return, will help you work out if you need to complete a self assessment tax return.
If you do need to complete a tax return, you either submit the whole tax return online or the whole tax return on paper.
If you need to complete the residence page and you want to submit the tax return online, then you need to purchase a 3rd party commercial tax return. a list of suppliers can be found at
Self Assessment commercial software suppliers.
Paper tax returns can be found at
Self Assessment tax return forms.
Thank you.