What is a UK National Insurance Number?

A UK National Insurance Number (NINO) is a unique identifier used in the United Kingdom's social security and tax systems. It serves as a reference for an individual's National Insurance contributions and ensures proper crediting of payments.

Format of a National Insurance Number

A valid NINO follows this specific format:

Where:

• \(L\) represents a letter (A-Z, except D, F, I, Q, U, and V)
• \(N\) represents a number (0-9)

Components of a NINO

1. Prefix: Two letters (e.g., AA, BT, ZZ)
2. Six digits: Randomly generated numbers
3. Suffix: A single letter (A, B, C, or D)

Example Calculation

Let's generate a sample NINO:

1. Choose a prefix: AB
2. Generate six random digits: 123456
3. Select a suffix: C

Combining these elements:

Visual Representation

Remember, the NINO generator on this page creates random, valid-format numbers for testing purposes only. These should never be used as real National Insurance Numbers.