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.
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Plain-English guides to UK Corporation Tax and CT600 filing.
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Dormant Company CT600: The 15-Minute Nil Return Guide (2026)
Got a dormant company? You still need to file a CT600. This 2026 guide shows you how to file a nil return in 15 minutes — even without HMRC's free service.
New Director? Your First CT600 in 2026: The No-Jargon Guide
Just incorporated a limited company? This plain-English guide covers everything new directors need to know about filing their first CT600 in 2026.
Filing Your First CT600: A Step-by-Step Guide for New Companies
Just incorporated a UK limited company? Here's everything you need to know about filing your first CT600 Corporation Tax return — from registering with HMRC to submitting your return.
Corporation Tax Loss Relief: How to Claim on Your CT600
Complete guide to corporation tax loss relief. Learn how to carry forward trading losses, carry back to previous years, claim group relief, and which CT600 boxes to use for each type of relief.
Research & Development (R&D) Tax Credits on CT600: SME Guide 2026
Complete guide to claiming R&D tax credits on your CT600. Covers the merged R&D scheme, qualifying expenditure, CT600L supplementary page, HMRC compliance checks, and cash credits vs tax reduction.
Do I Need to File a CT600 If My Company Made No Profit?
Yes — even if your company made no profit, you almost certainly need to file a CT600. Learn about nil returns, dormant companies, and how to file for £59.
CT600 Filing for First-Time Directors: Complete Beginner's Guide
Never filed a CT600 before? This step-by-step guide explains everything first-time directors need to know — deadlines, documents, iXBRL, and how to file for £59.
Company Director Tax Responsibilities: What You Must Do (and When)
Every UK company director has legal tax obligations. This checklist covers corporation tax, PAYE, VAT, confirmation statements, and key deadlines.
Filing Annual Accounts at Companies House: Complete Guide for Limited Companies
Everything you need to know about filing your company's annual accounts at Companies House — deadlines, formats, micro-entity vs small company, and penalties.
CT600 Box-by-Box Guide: Every Core Box Explained (2025/26)
Complete walkthrough of every CT600 box from 1 to 620. Plain English explanations, what to enter, and which boxes most small companies actually use.
The Cheapest Way to File Your CT600 in the UK (2026)
Compare every option for filing your CT600 — from accountants to DIY software — ranked by cost. Find the cheapest way to file your company tax return.