> ## Knowledge Base Index
> Fetch the complete knowledge base index at: https://helpdesk.onestaff.eu/sitemap.xml
> Use this file to discover available pages before exploring further.
> Pure-Markdown content can be obtained by appending a '.md' suffix to the content URLs listed in the sitemap (without the trailing slash).

# What is a UTR number useful for?

A Unique Taxpayer Reference number (UTR) is a 10-digit code that uniquely identifies you or your business. HMRC employs UTRs for all tax-related matters, ensuring accuracy and consistency in your tax affairs. Whether you're claiming a tax rebate or submitting a Self Assessment tax return, your UTR ensures that HMRC accurately identifies and processes your tax information.