CT600Filing

CT600Filing

Swift Catalyst Ltd
CT600Filing IRIS CARBON

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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.
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.
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
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
CT600Filing:

Audience

UK limited companies, accountants, sole traders acting through limited companies, and tax professionals.
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
CT600Filing:

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Supported
IRIS CARBON:

Support

Phone Support Supported
24/7 Live Support Supported
Online Supported
CT600Filing:

API

Offers API Not Supported
IRIS CARBON:

API

Offers API Not Supported
CT600Filing:

Screenshots and Videos

IRIS CARBON:

Screenshots and Videos

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
IRIS CARBON:

Pricing

No information available.
Free Version Not Supported
Free Trial Not Supported
CT600Filing:

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software
IRIS CARBON:

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software
CT600Filing:

Training

Documentation Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported
IRIS CARBON:

Training

Documentation Supported
Webinars Supported
Live Online Supported
In Person Not Supported
CT600Filing:

Company Information

Swift Catalyst Ltd
Founded: 2026
United Kingdom
www.ct600filing.co.uk
IRIS CARBON:

Company Information

IRIS CARBON
Founded: 2005
United States
iriscarbon.com
CT600Filing:

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CT600Filing:

Categories

Corporate Tax Supported
IRIS CARBON:

Categories

Climate Risk Supported
Compliance Supported
ESG Supported
ESG Reporting Supported
GRC Supported
Sustainability Supported
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
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
CT600Filing:

Integrations

Microsoft Excel Not Supported
Microsoft PowerPoint Not Supported
Microsoft Word Not Supported
IRIS CARBON:

Integrations

Microsoft Excel Supported
Microsoft PowerPoint Supported
Microsoft Word Supported
CT600Filing:
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IRIS CARBON:
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