CT600FilingSwift Catalyst Ltd
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Related Products
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CT600Filing:
About
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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IRIS CARBON:
About
IRIS CARBON is a cloud-based SaaS platform that simplifies financial, regulatory, and ESG reporting. Built on Microsoft 365, it lets teams keep working in familiar Word and Excel environments while collaborating on reports in real time, with multiple stakeholders reviewing, editing, and approving simultaneously. The platform connects data from ERPs and financial systems, reducing manual reconciliation, and automates XBRL/iXBRL tagging using AI trained on real regulatory filings and taxonomies. It supports major mandates including SEC, FERC, ESEF, HMRC, CIPC, and CSRD, along with ESG frameworks like GRI, TCFD, and ISSB. Features such as version management, smart document linking, and real-time validation strengthen governance, transparency, and accuracy across every disclosure. IRIS CARBON is ranked #1 for XBRL/iXBRL filing quality in the US for over 20 consecutive quarters and is trusted by companies across 29 countries, from Fortune 100 firms to mid-market businesses.
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CT600Filing:
Platforms Supported
Windows
Not Supported
Mac
Not Supported
Linux
Not Supported
Cloud
Supported
On-Premises
Not Supported
iPhone
Not Supported
iPad
Not Supported
Android
Not Supported
Chromebook
Not Supported
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IRIS CARBON:
Platforms Supported
Windows
Not Supported
Mac
Not Supported
Linux
Not Supported
Cloud
Supported
On-Premises
Not Supported
iPhone
Not Supported
iPad
Not Supported
Android
Not Supported
Chromebook
Not Supported
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CT600Filing:
Audience
UK limited companies, accountants, sole traders acting through limited companies, and tax professionals.
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IRIS CARBON:
Audience
Finance, regulatory reporting, and compliance teams at public companies, banks, utilities, and multinational firms that must prepare, tag, manage, and submit structured financial and non-financial disclosures to regulators and stakeholders
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CT600Filing:
Support
Phone Support
Not Supported
24/7 Live Support
Not Supported
Online
Supported
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IRIS CARBON:
Support
Phone Support
Supported
24/7 Live Support
Supported
Online
Supported
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CT600Filing:
API
Offers API
Not Supported
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IRIS CARBON:
API
Offers API
Not Supported
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CT600Filing:
Screenshots and Videos |
IRIS CARBON:
Screenshots and Videos |
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CT600Filing:
Pricing
£49/filing
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.
Free Version
Not Supported
Free Trial
Not Supported
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IRIS CARBON:
Pricing
No information available.
Free Version
Not Supported
Free Trial
Not Supported
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CT600Filing:
Reviews/
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IRIS CARBON:
Reviews/
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CT600Filing:
Training
Documentation
Supported
Webinars
Not Supported
Live Online
Not Supported
In Person
Not Supported
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IRIS CARBON:
Training
Documentation
Supported
Webinars
Supported
Live Online
Supported
In Person
Not Supported
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CT600Filing:
Company InformationSwift Catalyst Ltd
Founded: 2026
United Kingdom
www.ct600filing.co.uk
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IRIS CARBON:
Company InformationIRIS CARBON
Founded: 2005
United States
iriscarbon.com
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CT600Filing:
Alternatives |
IRIS CARBON:
Alternatives |
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IRIS CARBON:
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CT600Filing:
Categories |
IRIS CARBON:
Categories |
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CT600Filing:
Corporate Tax Features
Compliance Management
Not Supported
Data Import / Export
Supported
Data Verification
Supported
Electronic Filing
Supported
Exception Notification
Not Supported
For Nonprofits
Not Supported
For Partnerships
Not Supported
K-1 Reporting
Not Supported
Payroll & Employer Forms
Not Supported
Status Tracking
Supported
Tax Planning
Not Supported
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IRIS CARBON:
Compliance Features
Archiving & Retention
Supported
Artificial Intelligence (AI)
Supported
Audit Management
Supported
Compliance Tracking
Supported
Controls Testing
Supported
Environmental Compliance
Supported
FDA Compliance
Not Supported
HIPAA Compliance
Not Supported
Incident Management
Not Supported
ISO Compliance
Not Supported
OSHA Compliance
Not Supported
Risk Management
Not Supported
Sarbanes-Oxley Compliance
Not Supported
Surveys & Feedback
Not Supported
Version Control
Supported
Workflow / Process Automation
Supported
ESG Features
Activity Dashboard
Supported
Analytics/Reporting
Not Supported
Audit Management
Supported
Benchmarking
Not Supported
Compliance Management
Supported
Data Visualization
Not Supported
Document Management
Supported
Performance Metrics
Supported
Risk Assessment
Supported
Financial Reporting Features
"What If" Scenarios
Not Supported
Audit Trail
Not Supported
Balance Sheet
Not Supported
Cash Management
Not Supported
Consolidation / Roll-Up
Not Supported
Forecasting
Not Supported
General Ledger
Supported
Income Statements
Supported
Multi-Company
Not Supported
Multi-Department / Project
Supported
Profit / Loss Statement
Supported
GRC Features
Auditing
Supported
Disaster Recovery
Not Supported
Environmental Compliance
Supported
Incident Management
Not Supported
Internal Controls Management
Not Supported
IT Risk Management
Not Supported
Operational Risk Management
Not Supported
Policy Management
Not Supported
Sustainability Features
Audit Management
Supported
Benchmarking
Supported
Compliance Management
Supported
Corrective Actions (CAPA)
Not Supported
Emissions Management
Supported
Employee Training
Not Supported
Energy Management
Supported
Incident Management
Not Supported
KPIs
Not Supported
Performance Metrics
Not Supported
Stakeholder Engagement
Not Supported
Supplier Management
Not Supported
Waste Management
Not Supported
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CT600Filing:
Integrations
Microsoft Excel
Not Supported
Microsoft PowerPoint
Not Supported
Microsoft Word
Not Supported
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IRIS CARBON:
Integrations
Microsoft Excel
Supported
Microsoft PowerPoint
Supported
Microsoft Word
Supported
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CT600Filing:
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IRIS CARBON:
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