Companies House Software-Only Filing Transition Workspace

Analysis

Companies House Software-Only Filing Transition Workspace

One-line thesis

Build a narrow cross-client control room for small UK accounting firms, bookkeepers, and outsourced finance teams to manage the Companies House move toward software-only accounts filing, adjacent ACSP/identity-verification filing restrictions, and small-company accounts reform — without trying to become another accounts-production or tax filing engine.

Classification

opportunity / idea_filter — credible regulation-triggered workflow. The opportunity is not “make Companies House filing software.” GOV.UK already lists filing products, and accounting suites already prepare iXBRL accounts. The wedge is a transition workspace: inventory every client, choose and document the correct filing route, track ACSP/identity requirements, preserve evidence, handle exceptions, and prove who approved/submitted what.

ICP

Best early buyer: small UK accounting practices with 50-800 limited-company clients, especially firms serving a long tail of micro-entities, dormant companies, property/holding companies, LLPs, charities/CICs, and owner-managed companies spread across Xero, QuickBooks, Sage, FreeAgent, VT, Excel, desktop accounts-production tools, and occasional paper/WebFiling habits.

Secondary buyers:

• Bookkeepers and outsourced finance teams who coordinate year-end packs and Companies House submissions but rely on outside accountants or mixed software for statutory accounts.
• Company secretarial / formation agents moving toward ACSP status and needing evidence of who can file on behalf of clients.
• Small practices replacing legacy or partial tooling where accounts production, Companies House filing, CT600, client portal, and engagement-letter responsibilities are not in one system.

Weak buyer: one-off company directors. They feel the change, but support burden and willingness to pay are unattractive unless reached through accountants or a template product.

First-party timetable and scope

The timeline is less simple than “mandatory from April 2027.” Current first-party guidance says:

• Companies House’s Changes to UK company law accounts page says accounts filing changes will not be introduced in April 2027. The reforms remain under review, a final decision is due, and companies will receive at least 21 months’ notice to prepare.
• The same page still says that, in the future, all accounts will need to be filed using commercial software as part of Companies House’s shift to a fully digital, traceable filing service.
• Software-only filing applies to both directors who file themselves and companies using third-party agents or accountants. Companies House says all companies will need a suitable software product before web-based and paper filing options are no longer available.
• Companies House guidance updated 28 January 2026 repeats that the April 2027 accounts-reform date is paused and that at least 21 months’ notice will be given.
• GOV.UK’s software-filing guidance says software filings go through the XML gateway and accounts are received and processed in iXBRL. To file with software, users need the company authentication code and a Companies House presenter account; a credit account may be needed for fee-bearing filings.
• The separate joint HMRC / Companies House Company Accounts and Tax Online service closed on 31 March 2026, so some firms are already cleaning up a related filing-route migration even though the wider Companies House accounts reform is paused.
• The Economic Crime and Corporate Transparency Act reform package also changes the content of small and micro-company accounts: micro-entities are expected to file a balance sheet and profit-and-loss account; small companies a balance sheet, directors’ report, auditor’s report unless exempt, and profit-and-loss account; abridged accounts are to disappear; audit exemption statements must become more specific.
• ACSP rules create another operational deadline. Companies House says third-party providers doing identity checks must register as an Authorised Corporate Service Provider, and from no earlier than November 2026 businesses will need to be registered as an ACSP to file on behalf of clients. GOV.UK’s ACSP guidance adds that all agents filing for clients will need to register in future, must be AML-supervised, must update Companies House within 14 days of relevant changes, and may have to provide records if asked.

Important synthesis: the April 2027 accounts-filing implementation date is paused, but the direction of travel is not. The near-term pain is now readiness, segmentation, evidence, ACSP governance, client communication, and software-route control, not a single fixed date countdown.

Why this is an operations/evidence problem, not just a ledger-software problem

A ledger or accounts-production tool can create accounts and sometimes submit them. It does not automatically solve the cross-client transition questions:

• Which clients currently use WebFiling, paper, software filing, an accountant, or a mixed HMRC/Companies House route?
• Which accounts types are supported by the firm’s current products: micro, small full, dormant, LLP, charity, CIC, group/consolidated, IFRS, audit-exempt subsidiary, Welsh, or package accounts?
• Which clients need Companies House filing only, which need accounts plus CT600/HMRC filing coordination, and which require separate evidence because Companies House and HMRC deadlines differ?
• Which clients can be filed by a staff member after ACSP/presenter restrictions, and which require the firm, director, PSC, or authorised agent to complete identity steps first?
• Which client letters, engagement-letter changes, software choices, presenter credentials, authentication codes, filing confirmations, rejection notices, and exception rationales are stored where?
• Which changes are confirmed law, which are paused, and which are still consultation/implementation detail?

This creates a control-plane job above the filing products. The product would not calculate FRS 102/FRS 105 disclosures or submit accounts itself at first. It would be the place a partner or operations manager can see: “Every client has a route; the route is supported; the evidence is attached; ACSP responsibility is clear; nothing will be lost when filing channels change.”

Pain evidence

1. Companies House itself frames software filing as traceability and quality control

The 2023 Companies House blog says more than 4 million sets of accounts are filed annually and describes software-only filing as a way to improve transparency, traceability, validation, tagging, and fraud detection. The post says Companies House is removing other accounts filing routes and working with software companies on more complex package accounts.

That matters because the regulatory goal is not just submission convenience. It is structured, tagged, traceable data. A small firm therefore needs to manage taxonomy, route, acceptance, and evidence — not merely “which app exports a PDF.”

2. First-party pages push users into vendor selection without endorsing a product

GOV.UK’s “Find software for filing company accounts” page tells users that different products file different types of accounts, that they must know what type of accounts they are filing, and that Companies House does not endorse or recommend particular products. This shifts decision risk to the filer or agent.

For a small practice, that becomes a portfolio problem: one product may work for simple micro-entities, another for LLPs, another for consolidated accounts, and a specialist route for charities or edge cases. A neutral tracker can record “why this client is on this route” without becoming a vendor recommendation engine.

3. Practitioner forums show exact workflow gaps

AccountingWEB discussions surface the operational texture. In a November 2025 thread, a practitioner says their accounts-production software creates iXBRL accounts for HMRC and Companies House, but they do not have software to file those iXBRL accounts online at Companies House. The company-secretarial module from the same supplier feels “overkill” and expensive, and the practitioner wants a standalone option for UK GAAP/IFRS and consolidated accounts. Replies suggest TaxCalc, VT Filer, Caseware, and note that consolidated accounts can be a nightmare.

That is not a general accounting need. It is a filing-route, capability, and cost-fit question. The opportunity is to let firms inventory these exceptions and decide whether they need VT Filer, TaxCalc, Caseware, Capium, Andica, or an incumbent suite by client type.

Another AccountingWEB small-practice software thread shows mixed estates: Sage for some clients, Xero/QuickBooks/charities/sole traders elsewhere, UK and Ireland disclosure differences, and charity accounts described as a “unicorn” compliance need. A commenter specifically cites Companies House saying software-only filing will apply to all accounts and company types and asks how paper-only complex accounts will be handled. That is classic transition ambiguity.

4. Comment threads reveal small-company cost anxiety and confusion

The Companies House software-only filing blog comments show directors asking whether commercial software will be the only route, whether dormant companies must buy software, whether accounts must be filed separately to HMRC and Companies House, whether free options exist, and whether a regularly updated approved-software list will be provided. Companies House replied that commercial software will be needed, software-only filing will apply to all accounts/company types, and in a later May 2025 update said free software options were not available as initially anticipated, though low-cost solutions exist.

This supports the buyer psychology: small clients will ask their accountant for a simple answer, and accountants need a defensible route matrix rather than ad hoc email replies.

5. ACSP rules create a second control layer

From no earlier than November 2026, businesses will need ACSP registration to file on behalf of clients. ACSPs must be AML-supervised, have a senior person register, maintain legal compliance, and may be suspended or ceased. GOV.UK says all users added to an authorised agent account can file on behalf of clients and verify identities, while account owners/admins manage users.

This creates operational risk: who in the practice is authorised, who was added to the account, whose filing action is allowed, and what records prove the firm met its role? Practice-management tools may hold tasks, but they may not map ACSP status, Companies House presenter requirements, identity verification, client approval, and accounts filing evidence in one place.

Substitutes and competitors

Direct substitutes:

• Spreadsheets/Airtable/Notion plus shared folders for receipts and client letters.
• Practice-management suites and portals: Karbon, TaxDome, Bright, AccountancyManager, Senta-style workflows, IRIS practice tools.
• Accounts-production and filing products: TaxCalc, VT Final Accounts / VT Filer, Capium, Andica, Caseware, Sage Final Accounts, IRIS, BTCSoftware, Xero Tax, FreeAgent, Ftax, TinyTax, Easy Digital Filing, and others.
• Company-secretarial tools that can file Companies House documents but may be overkill for practices that only need annual accounts filing.
• Accountant checklists, institute webinars, template client letters, and ad hoc partner review.

Why a narrower workspace can still win:

• Neutral across vendors. Filing software is the object being chosen; it is not a good neutral place to compare route suitability across its competitors.
• Transition-specific schema. Generic task tools do not know “software-only accounts filing paused but still expected,” “ACSP from no earlier than November 2026,” “presenter account,” “company authentication code,” “iXBRL package accounts,” “audit exemption statement,” “micro P&L filing,” “paper route being removed,” or “client used old joint filing service.”
• Evidence-first. A transition workspace can store immutable decision logs, client approvals, submission receipts, rejection notices, route exceptions, and staff authority records by filing period.
• Service-led sale. A downloadable “Companies House filing transition audit” can become a paid fixed-fee cleanup/implementation project for practices before it becomes pure SaaS.
• Narrow enough to ship. The MVP is a tracker, not an accounts engine, so the product avoids regulated calculation risk at first.

MVP

Build the first version as a “Companies House Filing Transition Board”:

1. Client import and segmentation

• CSV import of company number, client name, year end, accounts type, current accounts-production tool, current Companies House route, HMRC route, responsible partner/staff, dormant/micro/small/LLP/charity/CIC/group flags.

2. Route and capability matrix

• Per-client route: current web/paper/software/accountant route; target software route; supported account type; Companies House presenter account needed; HMRC CT coordination; known unsupported edge case.
• Status values: unknown, route selected, client approved, credentials ready, filed, accepted, rejected, exception.

3. ACSP / authorised-filer readiness

• Firm ACSP registration status, AML supervisor, registration owner, authorised users, identity-verification status where relevant, client filing authority, engagement-letter update flag.
• Do not perform identity verification; track operational readiness and evidence only.

4. Evidence locker

• Attach client approval, route decision, software quote, Companies House confirmation, submission receipt, rejection notice, presenter/account setup proof, exception rationale, and implementation notes.
• Append-only event log for “who changed/approved/filed.”

5. Regulatory-change tracker

• Built-in timeline cards: CATO closure complete, Companies House accounts reform paused, at least 21 months’ notice, ACSP no earlier than November 2026, future software-only accounts filing, small/micro P&L filing, audit exemption statement changes.
• Each item has status: confirmed/live, paused, future/notice pending, consultation, firm action needed.

6. Exception board

• Clients with no target route, unsupported accounts type, missing authentication code, missing presenter setup, no client approval, unresolved rejection, staff not authorised, or filing deadline inside 60 days.

7. Exports

• Partner dashboard PDF, client-list CSV, evidence ZIP by client, and “client route letter” template.

Monetization: £99-£249/month for practices, or a £499-£1,500 fixed-fee transition audit pack that includes the hosted board for 90 days. The fixed-fee wedge may sell better first because the deadline is uncertain and firms may think of this as a project, not another permanent SaaS subscription.

Distribution wedge

Best channels:

• Search pages around “Companies House software only filing paused,” “Companies House filing software small company,” “ACSP filing clients November 2026,” “file iXBRL accounts Companies House,” and “Companies House reform client checklist.”
• AccountingWEB Any Answers and small-practice communities where practitioners ask which standalone filing product to use.
• Free spreadsheet/checklist: “Software-only Companies House filing client audit template.” Upgrade path: import into hosted board, attach evidence, export partner report.
• Webinars or CPD-adjacent content for small firms: “What to do while accounts reform is paused: client inventory, ACSP readiness, filing-route evidence.”
• Partnerships with small-practice consultants, bookkeeping networks, and company secretarial providers that can run the workspace as a service.

Best positioning:

“Do not wait for the new date. Build the client-by-client filing route map now, so every Companies House account has a supported software path, authorised filer, and evidence trail before web/paper routes disappear.”

Risks and self-critique

• Timeline deferral risk: The April 2027 date is paused, reducing urgency. Counter: anchor the product around ACSP November 2026 readiness, current CATO cleanup, and a low-effort audit board rather than a panic product.
• Incumbent absorption: Practice-management and filing suites can add checklists. Counter: stay vendor-neutral and evidence-first; sell as a cross-stack transition project.
• Too narrow after transition: Once firms settle into software routes, demand may fade. Counter: make the schema reusable for recurring Companies House evidence, ACSP authorised-user controls, filing rejections, and future filing-channel changes.
• Small-firm price sensitivity: The firms with the messiest long-tail clients may have low margins. Counter: start with fixed-fee audit packs and templates; validate paid pilots before building integrations.
• Regulatory advice liability: Users may mistake route guidance for legal/accounting advice. Counter: label sources/status clearly, record firm decisions, and avoid automated recommendations beyond checklists.
• Data-security burden: Company authentication codes, UTRs, receipts, and identity-verification evidence are sensitive. MVP should minimize secrets, support redacted attachments, and offer UK/EU hosting or local export.
• Evidence gap: Public sources strongly validate confusion and operational work, but not standalone SaaS purchase intent. The next validation step is 15 interviews with practices that have mixed accounts-production stacks and 3 paid pilot audits.

Scorecard

Verdict: BUILD / TEST WITH PAID PILOTS. The best product is a narrow operations workspace for firms already juggling multiple filing tools, not a new Companies House filing product.