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File your UK Corporation Tax CT600 return online. Simple, affordable, HMRC-compliant.

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

3 results for “cis”Clear search
23 February 2026

Construction Industry Scheme (CIS) & Corporation Tax: CT600 Guide

How CIS deductions work for limited companies, claiming CIS repayments on your CT600, and the interaction between CIS and Corporation Tax.

ct600cisconstructioncorporation-tax
12 February 2026

CT600 Penalties: What Happens If You File Late?

Complete guide to CT600 late filing penalties and charges. How much you'll pay, when penalties apply, and how to appeal HMRC penalty decisions.

ct600penaltieslate filingHMRC
12 February 2026

Do I Need an Accountant to File My CT600?

Honest assessment of when you need an accountant for CT600 filing vs when you can do it yourself. Costs, complexity, and decision factors explained.

ct600accountantDIY filingsmall business