Hi Paul Weller,
You cannot file a Self Assessment tax return online: for a partnership, for a trust or estate, if you lived abroad as a non-resident, to report multiple ‘chargeable gains’, for example from life insurance, if you get income from a trust, you’re a Lloyd’s underwriter or a religious minister.
Instead, you will need to purchase 3rd party commercial tax return, using your government gateway user ID and password or download paper tax returns and supplementary pages instead.
File your Self Assessment tax return online
Thank you.