Common NI number mistakes to avoid (that cause delays)

Small mistakes can create admin delays. Here are common ones and how to avoid them.

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• Typing the wrong NI number (double-check letter/number order)
• Using an old address on forms
• Mismatched names (spelling differences vs documents)
• Ignoring payroll follow-ups
• Ordering a plastic card before confirming your NI number

Tip: Keep one “source of truth” (latest official letter or payslip) and update everything else from that.

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