You can download forms and guidance to help you send your tax return either online or by post.
You must send your tax return by the deadline or you’ll get a penalty.
There are 2 ways to do a Self Assessment tax return. You can:
This guide is also available in Welsh (Cymraeg).
Only fill in the short tax return (SA200) if HMRC sends it to you. You can’t download it, but you can read the guidance notes.
You might need to fill in more sections, known as ‘supplementary pages’, if you’re telling HMRC about these types of income:
Check the full list of supplementary pages to make sure you fill in the right sections if you’re sending your return by post.
If you’re sending a tax return for the 2012 to 2013 tax year or earlier, get forms from the National Archives.
There are special forms if you’re sending a tax return for a business partnership or non-resident company, or if you’re a trustee.
If you need help you can:
Don’t include personal or financial information like your National Insurance number or credit card details.