Directgov - Beginner's guide to tax
This site explains everything about all the different taxes in the UK:, including Income Tax, National Insurance and Council Tax.
Directgov - Reclaiming tax
Here you can find out what to do if you think you may have paid too much tax.
Directgov - Tax for the self-employed
If you're self employed, this site tells you what you need to do to get your tax sorted.
Directgov - Tax on savings and investments
Find out about savings and investments and how they are affected by tax.
HM Revenue and Customs
Getting a job could mean that you have to start paying tax. Check here for an introduction to the world of taxation.
TAX+U
Want to know if you’re owed any tax? Check through this site