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Plain-English guides to UK Corporation Tax and CT600 filing.

14 results for “marginal relief”Clear search
20 February 2026

Associated Companies — How They Affect Your Corporation Tax Rate

How associated companies change your Corporation Tax thresholds. What counts, what doesn't, dormant company exemption, and how to report them on your CT600.

associated companiescorporation taxthresholdsmarginal reliefCT600tax rate
12 February 2026

Corporation Tax Rates 2025/26 - Marginal Relief Calculator

Current UK corporation tax rates and marginal relief.

Corporation TaxTax Rates
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