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

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23 February 2026

CT600 Box by Box: The Income Section (Boxes 145-205) Explained

Detailed guide to every box in the CT600 income section. What goes where — turnover, trading profits, property income, chargeable gains, and total profits.

ct600boxesincomecorporation-taxhow-to
22 February 2026

CT600 Box 155: Trading Profits — What Goes Here and How to Calculate It

Box 155 is the most important number on your CT600. Learn exactly what trading profits means, how to calculate it, and common mistakes to avoid.

CT600box 155trading profitscorporation taxtax adjustments
21 February 2026

Corporation Tax on Overseas Income: Guide

How UK companies pay corporation tax on overseas income. Covers foreign trading profits, dividends, rental income, double taxation relief, and CT600 reporting.

corporation taxoverseas incomeforeign incomedouble taxation reliefCT600UK companyinternational tax