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

17 results for “boxes”Clear search
21 February 2026

R&D Tax Relief for SMEs: How the Merged Scheme Works and How to Claim on Your CT600

Understand the merged R&D tax relief scheme for SMEs from April 2024, qualifying expenditure, enhanced rates, and which CT600 boxes to complete.

R&Dtax reliefCT600SMEHMRCcorporation tax
20 February 2026

CT600 Box by Box Guide: Every Section Explained in Plain English

A complete walkthrough of every CT600 box and section. Understand what each field means, which boxes apply to your company, and how to fill them in correctly.

CT600HMRCcorporation taxtax returnguide
19 February 2026

R&D Tax Relief for Small Companies: What to Claim on Your CT600

R&D tax credits for SMEs: what qualifies, how to calculate the relief, and which CT600 boxes to complete. Plain English guide.

19 February 2026

Corporation Tax Losses: How to Carry Forward and Carry Back Losses

How to use trading losses on your CT600 return. Carry forward, carry back, group relief, and which CT600 boxes to complete for loss relief claims.

19 February 2026

10 Common CT600 Mistakes (and How to Avoid Them)

The most frequent errors company directors make when filing their CT600. From wrong dates to missing boxes — and how to get it right first time.

ct600mistakescorporation taxfiling tips
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