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Corporation Tax Calculator
UPDATED 2025/26 + 2026/27
Calculate your UK Corporation Tax liability including marginal relief. Small profits rate of 19% applies up to £50,000, main rate of 25% applies from £250,000 — with a sliding scale between.
Your company's profit before Corporation Tax (taxable total profits).
Other UK or overseas companies under common control. Most small companies have zero.
For guidance only. Based on confirmed UK Corporation Tax rules for 2025/26 and 2026/27. Marginal relief fraction 3/200. Thresholds are reduced proportionally if you have associated companies. Doesn't account for ring-fenced trades, R&D credits, group reliefs, or losses brought forward — for those, book a free call.
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