What is a Tax Office Reference Number?

I came across the term Tax Office Reference Number (TORN) while managing my taxes, but I’m not entirely sure what it is or why it’s important. Can someone explain what a Tax Office Reference Number is, how it’s used, and the best ways to find it if I need it for my tax filings?
 
A Tax Office Reference Number is a unique identifier assigned by a country’s tax authority to employers or businesses. It’s used for tax administration, especially for reporting employee income and tax deductions. In the UK, it's often seen on PAYE documents and helps link tax records to the correct employer.
 
A Tax Office Reference Number is a unique code assigned by a country’s tax authority to identify an employer, business, or taxpayer for tax purposes. It’s used to track tax records, payments, and compliance.
 
A Tax Office Reference Number is a unique identifier issued by tax authorities to individuals or businesses. It helps track tax records, payments, and obligations, ensuring proper filing and accurate assessment of taxes for compliance with government regulations.
 
A Tax Office Reference Number is a unique identifier issued by tax authorities to individuals or businesses. It’s used to track tax records, payments, and obligations. This number ensures accurate reporting, filing, and correspondence with the tax office, helping prevent errors and maintain proper tax compliance.
 
A number given to you by the tax office in your country (such as HMRC in the UK). It assists in determining your employer or tax account to be used in record-keeping.
Tax Codes
 
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