If you have a query about your tax code or PAYE you may be able to get help from payroll.
You will find contact details for your local tax on your PAYE coding notice.
Directgov gives some tips on dealing with HMRC.
Keep up to date with DMGT's consumer site, This is Money, which has a wealth of information about tax.
Find out more about tax credits from the Financial Services Authority's guide.
Advice Guide is the Citizens Advice Bureau's online service.
You can speak to someone face-to-face at a Tax Enquiry Centre.
Business Link is a free business advice and support service, if you're thinking of starting a new business or already have one.