The taxpayer's paying (underpayment) UOMI rate is 8.97% p.a. effective 16 January 2026 (down from 9.89%), not 10.96%. Best phrased as 'currently 8.97%, set by Order in Council and revised periodically'.
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Provisional tax kicks in above $5,000 RIT; UOMI at 10.96% for 2026-27
Why this matters for founders
Founders whose first profitable year pushes RIT over $5,000 should plan cash for provisional instalments and avoid underestimating, since 10.96% UOMI is steep. If you qualify for the safe harbour (RIT under $60,000), pay in full by terminal tax day to sidestep interest entirely.
Source: Inland Revenue (IRD) / NZTaxTools
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