UK National Insurance Calculator
- Annual NI
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- Monthly
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- Effective rate
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2026/27 thresholds — Class 1 employee: 8% between PT (£12,570) and UEL (£50,270), 2% above. Employer (secondary): 15% above ST (£5,012). Class 4 self-employed: 6% LPL–UPL, 2% above.
About this tool
UK National Insurance Calculator is a single-purpose utility on instant.tw, a free toolbox of calculators, converters, generators, and quick lookups. Everything works in your browser — nothing is uploaded, nothing is stored on a server unless explicitly noted.
Category: Tax & Government — UK. Browse more Tax & Government — UK tools.