iXBRL for Companies House

ARKK streamlines Companies House filings, tagging and filing your annual accounts in iXBRL (Inline Extensible Business Reporting Language) using regulator-recognised software. We handle the full process as a managed service, so your accounts are accurate, compliant, and filed on time, without the manual work or deadline scramble that usually comes with them.

Preparing accounts in-house is often a fragile, last-minute task, and the shift toward mandatory software-only filing has made it harder still. A single mistagged or wrongly formatted submission can mean rejection, a missed deadline, and the late penalties that follow. ARKK removes that risk entirely, giving your finance team back the time and confidence to focus on higher-value work.

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Save time

Tagging is handled by our expert team, with turnaround available in as little as 24 hours, cutting manual workload during filing season.

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Ensure accuracy

Every account is tagged and tested by our experts against the latest Companies House taxonomy before submission.

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Mitigate risk

Regulatory recognised software and ISO27001-certified software give every submission a secure, auditable trail.

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Gain confidence

Our expert team applies over 2 million tags to more than 6,000 accounts every year, so the expertise is already in place.

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Stay compliant

Taxonomies are kept current as Companies House requirements change, so your tagging stays aligned with the latest rules.

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Get support

Our UK-based team offers best-practice guidance and fast answers, whenever you need them.

The information that came back from ARKK was so clear and transparent.

Kreeson Thatiha, Head of Finance and Client Money, eToro

I was continually reassured of ARKK's technology and their commitment to customer service.

Darryl Alford, Finance Manager, DPD

ARKK were prepared to be more flexible with how we worked and how we were set up.

Alistair McClelland, Head of Tax, The University of Edinburgh

Simply outstanding service and a real pleasure to work with.

Chris Parsons, Production Director, Radley Yeldar

ARKK are extremely responsive and supportive partners.

Janette Moriarty, Group Financial Reporting Director, Kerry Group

ARKK are invaluable to us… I wouldn't consider another project without them.

Valentin Ramousse, Head of International Business Development & Partner, Emperor Works

The speed and accuracy of implementation was incredible.

Akash Kalaiya, EMEA Tax Manager, Universal Weather and Aviation

+ What is iXBRL?

iXBRL (Inline Extensible Business Reporting Language) is a digital tagging standard used for filing accounts with Companies House, embedding machine-readable tags into financial statements so the data can be processed automatically as well as read by humans. Tagging doesn't change what a business reports, only how the financial statements are marked up before submission. As Companies House moves toward mandatory software-only filing, businesses will need to submit their annual accounts as tagged, digital files.

+ How does ARKK handle iXBRL tagging for Companies House?

ARKK's UK-based team tags your financial statements using regulator-recognised software, applying the correct taxonomy to each account before testing and validating the output. You review the tagged files before they're submitted to Companies House, with turnaround available to suit your filing deadline.

+ How long does iXBRL tagging take?

Standard turnaround is typically around 15 days from when files and account details are submitted, followed by a review period of up to four weeks for amendments. Faster turnaround, including same-day tagging, is available for businesses facing an imminent deadline.

+ How is data secured during the iXBRL tagging process?

Files are uploaded and managed through ARKK's ISO 27001-certified cloud-based portal, the internationally recognised standard for information security management. This gives you a single, secure destination for uploading, tracking, and accessing your tagged files throughout the process.

+ What are the risks of managing iXBRL tagging manually or without specialist support?

Incorrect or incomplete tagging can result in a rejected submission, creating delays at a time when filing windows are already tight. Keeping up with periodic taxonomy updates also requires specialist knowledge, and errors are harder to catch without expert review before submission.

ARKK's six-step iXBRL tagging process for Companies House