Audience
UK limited companies, accountants, sole traders acting through limited companies, and tax professionals.
About CT600Filing
CT600Filing is online Corporation Tax filing software for UK limited companies, directors and accountants. A guided, step-by-step process helps you prepare your CT600 and iXBRL accounts, then file the return with HMRC and the accounts with Companies House from one account.
Corporation Tax, including marginal relief, is calculated as you go, and errors are checked before you submit. Every submission is tracked, with HMRC’s response and a PDF of the return to download.
Supports dormant, FRS 105 micro, FRS 102 Section 1A small and full FRS 102 accounts, for periods up to 18 months.
Prepare free and pay only when you submit. Prices start at £49 + VAT for a nil CT600 with dormant accounts. Companies House filing is included on every plan. No subscription, nothing to install, and free amendments to the same return.
Accountants get white-label filing under their practice name, one dashboard for all clients, CSV trial balance import and credit bundles from £10.99 per filing.
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Pricing
Starting Price:
£49/filing
Pricing Details:
CT600Filing starts from £49 + VAT per return. Prepare free, pay when you file. No subscription.
All plans include CT600 filing to HMRC and accounts submission to Companies House:
Dormant & Nil Return – £49 + VAT: Nil CT600 to HMRC and dormant accounts filing to Companies House.
Micro Company – £79 + VAT: CT600, FRS 105 iXBRL accounts and Companies House filing.
Small Company – £159 + VAT: CT600, FRS 102 Section 1A iXBRL accounts and Companies House filing.
Medium & Large – £299 + VAT: CT600, full FRS 102 accounts and Companies House filing.
Each payment covers one return, with unlimited amendments for that return. Returns are submitted directly to HMRC, and accounts are filed with Companies House.
Accountants and bookkeepers: Filing credits start at £399 + VAT for 10 filings, reducing to £10.99 per filing with the 100-credit bundle. Credits are valid for 12 months.
No monthly subscription. Prepare your return free and pay only when ready to submit.
All plans include CT600 filing to HMRC and accounts submission to Companies House:
Dormant & Nil Return – £49 + VAT: Nil CT600 to HMRC and dormant accounts filing to Companies House.
Micro Company – £79 + VAT: CT600, FRS 105 iXBRL accounts and Companies House filing.
Small Company – £159 + VAT: CT600, FRS 102 Section 1A iXBRL accounts and Companies House filing.
Medium & Large – £299 + VAT: CT600, full FRS 102 accounts and Companies House filing.
Each payment covers one return, with unlimited amendments for that return. Returns are submitted directly to HMRC, and accounts are filed with Companies House.
Accountants and bookkeepers: Filing credits start at £399 + VAT for 10 filings, reducing to £10.99 per filing with the 100-credit bundle. Credits are valid for 12 months.
No monthly subscription. Prepare your return free and pay only when ready to submit.
Integrations
No integrations listed.
Company Information
Swift Catalyst Ltd
Founded: 2026
United Kingdom
www.ct600filing.co.uk
Videos and Screen Captures
CT600 filing screen for declaration approval, with fields for board approval date, signer, and company position.
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Product Details
Platforms Supported
Cloud
Training
Documentation
Support
Online
CT600Filing Frequently Asked Questions
Q: What kinds of users and organization types does CT600Filing work with?
CT600Filing works with these users and organization types: Mid Size Business, Small Business, Enterprise, Freelance, Nonprofit, Government, and Startup.
Q: What languages does CT600Filing support in their product?
CT600Filing supports these languages: English.
Q: What kind of support options does CT600Filing offer?
CT600Filing offers support via online.
Q: What type of training does CT600Filing provide?
CT600Filing provides training in the form of documentation.
Q: How much does CT600Filing cost?
Pricing for CT600Filing starts at £49/filing.
CT600Filing Product Features
Corporate Tax
Data Import / Export
Supported
Data Verification
Supported
Electronic Filing
Supported
Status Tracking
Supported
Compliance Management
Not Supported
Exception Notification
Not Supported
For Nonprofits
Not Supported
For Partnerships
Not Supported
K-1 Reporting
Not Supported
Payroll & Employer Forms
Not Supported
Tax Planning
Not Supported
