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Company details
Written by the company
CT600Filing is an HMRC-recognised online corporation tax software platform designed specifically for UK limited companies, sole directors, and accountancy practices. The platform provides a straightforward, guided, and affordable alternative to the legacy HMRC joint filing service (CATO), which permanently closed on 31 March 2026. Operated by Swift Catalyst Ltd, CT600Filing simplifies the process of completing and submitting a UK Company Tax Return (CT600). The intelligent online form guides users box-by-box, auto-calculates precise corporation tax liabilities, and automatically generates fully tagged iXBRL company accounts compliant with FRS-102 and FRS-105 standards. This allows businesses to seamlessly file directly to both HMRC and the Companies House XML Gateway from one unified online account with zero software installations required. Built on a fair "pay-per-filing" model, CT600Filing eliminates restrictive monthly or annual subscriptions. Users can prepare their entire return completely free of charge and only pay upon submission, with transparent packages tailored to dormant entities, micro-businesses, and small companies. To ensure maximum peace of mind, every single filing fee includes unlimited amendments and re-submissions for that specific accounting period—guaranteeing no hidden costs or surprise fees. At Swift Catalyst Ltd, compliance, ease of use, and data security are the pillars of our software. We use SSL-encrypted infrastructure and secure Stripe payments to keep your data safe while helping you meet your statutory deadlines accurately and on time.
Contact info
United States
- www.ct600filing.co.uk
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