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UTR vs National Insurance Number: What You Need for Your First Self Assessment
Britvex Advisory · UK Tax Made Simple UK TAX MADE SIMPLE · PART 2 · BRITVEX.CO.UK Reviewed: 12 November 2026 · Audience: first-time Self Assessment taxpayers and people confused by UK tax reference numbers. UTR and National Insurance numbers are not the same thing. A National Insurance (NI) number is your lifelong personal reference used…