Not being asked for a tax return is not a defence. It is up to you to decide if you need to fill one in. If you don't and are found out then HMRC will come after you plus charge interest on any tax you haven't paid.
It's usually just a case of entering all your income (including things like bank/building society interest), then you'll be asked to fork out the tax and National Insurance. Hopefully you'll have set aside 50% of your income over the year to cover this otherwise you may be in for a nasty surprise as the tax will be due on the 31st January and interest is charged if you don't pay on time.
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Hi, thanks for your advice! It was the tax mans fault, they said when I registered they would contact me when they wanted me to do a self assesment, they didnt so I called them and they apologised and gave me a three month extension
50%??! I've been putting away 30% why the hell would they charge you HALF your wages?! There is noway I earn near the threshold for 30% tax so I anticipated my tax to be at 22%. My tax is from October 07 till April 08. When is 08 - 09 due? (I'm assuming September time again for 09?)