UTR checker

Validate and verify Unique Taxpayer Reference (UTR) numbers instantly with our free online UTR checker tool.

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About This Tool

The UTR Checker is a specialized online tool designed to validate Unique Taxpayer Reference numbers used in the UK tax system. This tool performs comprehensive validation including format checking, length verification, and mathematical checksum validation to ensure the UTR number is structurally correct. Simply enter any UTR number to get instant validation results with detailed feedback on format compliance and checksum accuracy. Perfect for accountants, tax professionals, businesses, and individuals who need to verify UTR numbers before submitting tax documents to HMRC.

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How to Use

Enter the 10-digit UTR number in the input field
Click the 'Validate UTR' button to check the number
View detailed validation results including format check and checksum verification
If invalid, see specific error messages explaining what needs correction

Frequently Asked Questions

Find Quick Answers

What is a UTR number?

UTR stands for Unique Taxpayer Reference, a 10-digit number issued by HMRC to individuals and businesses in the UK for tax purposes. It's used to identify taxpayers in all communications with HMRC.

What format does a valid UTR follow?

A valid UTR is exactly 10 digits long, cannot start with '00', and must pass a mathematical checksum validation (modulus 97 algorithm) to ensure data integrity.

Does this tool store or transmit UTR numbers?

No, all validation happens entirely in your browser. No UTR numbers are sent to any server or stored anywhere, ensuring complete privacy and security.

What does the checksum validation check?

The checksum validation uses a modulus 97 algorithm on the first 9 digits to verify that the 10th digit (check digit) is mathematically correct, helping detect transcription errors.

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