“Multiple entities, intercompany balances, consolidated accounts and tax consistency.”
- Digital Reporting UK
This guide is written for Group Companies that need a dependable way to prepare Corporation Tax returns, statutory accounts, tax computations and iXBRL files for UK filing.
After HMRC’s previous free joint accounts and Company Tax Return filing route closed, directors and finance teams need a software-based or expert-assisted workflow. The goal is simple: prepare the right filing pack, tag it correctly, validate it early and avoid deadline disruption.
Why group filings need coordination
Groups often manage several filing deadlines, accounting periods, subsidiaries, intercompany balances and consolidation adjustments. A filing issue in one company can affect the wider group timetable.
Key points for Group Companies:
- Filing route: HMRC’s old free joint filing route has closed, so commercial software or a specialist filing workflow is now required.
- Core package: CT600, accounts, tax computation and iXBRL files should agree before submission.
- Validation: technical checks should happen before the deadline, not after an HMRC rejection.
- Evidence: keep final files, review notes and submission confirmations for your records.
Entity-level filing still matters
Each company may need its own accounts, tax computation and CT600. Consolidated accounts do not remove the need to ensure subsidiary filings are accurate and consistent.
Accounts
Final statutory accounts should be complete, approved and consistent with the tax computation.
Tax Computation
Tax adjustments, losses, reliefs and tax payable should be supported and reviewed.
iXBRL Tagging
Accounts and computations should be tagged using the correct taxonomy and contexts.
Validation
The full package should be checked for technical errors before filing.
Key risk areas
Risk areas include intercompany loan balances, management charges, group relief, transfer pricing support, consolidated disclosures and inconsistent related party notes across entities.
- Inconsistent numbers: profit, tax, reserves or balance sheet figures do not agree across documents.
- Wrong period dates: accounts, computation and CT600 periods are not aligned.
- Missing iXBRL facts: required values are present visually but not tagged properly.
- Late review: tagging starts only after the deadline pressure has already arrived.
Recommended group workflow
Create a filing tracker, lock accounting periods, agree intercompany balances, prepare entity computations, tag each filing pack and validate before submission.
- Confirm the entity and period: verify company name, UTR, registration number and accounting dates.
- Lock the accounts: avoid tagging moving numbers.
- Prepare the computation: support all adjustments and tax balances.
- Tag and review: complete iXBRL tagging and review facts, signs and contexts.
- Validate and file: fix errors before submission and retain confirmation evidence.
How Digital Reporting helps
Digital Reporting (UK) supports group finance teams and advisers with repeatable iXBRL tagging and CT600 filing workflows across multiple companies.
- Accounts and computation review
- iXBRL tagging for accounts and computations
- Validation checks before submission
- Secure filing workflow and support
Related UK iXBRL and CT600 Support
Explore related filing support from Digital Reporting (UK):
- CT600 Filing Service — Prepare and submit Corporation Tax returns with a structured workflow.
- iXBRL Tagging Service — Convert accounts and computations into HMRC-ready iXBRL files.
- iXBRL for Accountants — White-label production support for accounting firms.
- Urgent Filing Help — Support when your CT600 deadline is approaching.
Digital Reporting UK Team
iXBRL SpecialistsOur specialists focus exclusively on digital reporting, iXBRL tagging and UK filing workflows for companies, LLPs, groups and specialist entities. We help businesses and accounting firms meet HMRC and Companies House requirements efficiently and accurately.
Need Help With This Filing?
Digital Reporting (UK) can help you prepare, tag, validate and submit your CT600 and iXBRL filing package with a clear, secure and reviewable workflow.