Choosing the Best Dormant Company Accounts and CT600 Filing Software for 2026 Compliance

If your company hasn't traded all year, why does compliance still feel complicated? Because "dormant" means two different things to two different agencies. Companies House treats a company as dormant when it has had no significant accounting transactions. HMRC treats it as dormant when it isn't active for Corporation Tax — a separate determination, made separately.

That split drives the paperwork. And with HMRC's free online filing service now unavailable, Company Tax Returns must be submitted through commercial, HMRC-recognized software.

• Confirm dormant status with both Companies House and HMRC — one doesn't imply the other.
• File dormant accounts with Companies House by your accounting reference deadline.
• Submit a CT600 to HMRC if a notice to deliver has been issued.
• Track both deadlines separately; late filing triggers automatic penalties.

Do Dormant Companies Need to File CT600?

Usually, yes. HMRC often issues a notice to deliver a Company Tax Return even when nothing has happened all year, and that notice creates a legal obligation regardless of whether tax is owed. A dormant company CT600 is waived only once HMRC formally records the company as dormant for Corporation Tax. Ignoring the correspondence doesn't cancel it — penalties accrue if you don't respond.

How to File Accounts for a Dormant Company Correctly

Companies House accepts simplified dormant accounts using form AA02 from qualifying companies, rather than full statutory accounts. Either way, the balance sheet must balance: share capital on one side, an equivalent amount owed by subscribers or held as cash on the other. To file dormant accounts online, you also need Presenter credentials — an authentication code tied to the company itself.

Not every tool built for accountants suits a single inactive entity. When comparing options, weigh four things.

• Dual filing. The software should produce both the CT600 for HMRC and iXBRL-tagged accounts for Companies House from one set of figures. Re-keying the same account of company data into two portals is where errors start.
• A guided wizard. Directors without accounting training need prompts and plain-language questions, not blank schedules. Wefile's multi-step wizard is designed for this purpose.
• Accounting standards. Confirm support for FRS 105 for micro-entities and FRS 102 for small companies, since the disclosure requirements differ.
• Pricing structure. Annual subscriptions rarely make sense for one filing a year. Pay-per-filing pricing matches the workload of a dormant company.

The Search for Free vs Paid Accounts Software

Genuinely free filing routes have thinned out since HMRC retired its own service, and commercial vendors have no equivalent obligation to offer one. A one-off filing fee is usually much less than an accounting suite's annual license. Watch for freemium tools that advertise free bookkeeping but place the actual CT600 submission behind a paid tier — check before you enter a year's data.

Technical Deep Dive: iXBRL Tagging for Dormant Entities

iXBRL — Inline eXtensible Business Reporting Language — embeds machine-readable tags inside a human-readable document, so HMRC's systems can parse each figure automatically. It's mandatory for statutory accounts submitted with a return. Good software tags automatically as you complete the wizard. Manual attempts fail on predictable errors: untagged share capital, mismatched currency units, missing context dates, or an accounting period that doesn't reconcile.

Solutions fall into three broad groups, and the right one depends on how much activity you actually have.

Judge each against the same three criteria: ease of use for a non-accountant, total cost for a single annual filing, and HMRC recognition status. Recognition is non-negotiable — unrecognized software cannot transmit to HMRC, no matter how polished the interface looks.

Best Software for Dual HMRC and Companies House Filing

The workflow worth paying for maps one dataset to both agencies. You enter the figures once; the platform generates the CT600, the tagged accounts of company, and the Companies House submission. Strong tools generate a nil company tax return from a single confirmation, then run validation checks that block submission until every rejection risk is cleared.

Software Options for Micro-Entities and Startups

Micro-entities benefit most from FRS 105 support, the simplest UK reporting standard. It permits a stripped-back balance sheet with minimal notes — ideal when there are no fixed assets, no debtors, and no liabilities to disclose. Directors holding several dormant shells should also check that the interface works on a phone, since filings are short and often handled between other tasks.

Self-service software has real boundaries, and recognizing them early saves money.

It suits straightforward cases. It doesn't replace advice on group structures, overseas income, loans to participators with unusual histories, or a year where the company briefly traded and then stopped. If your situation carries judgment calls, pay for judgment.

Automation also can't detect bad inputs. Enter the wrong figures and the platform will submit them faithfully — validation checks structure and tagging, not the truth of your numbers.

Two failure modes account for most blocked filings:

• Expired or missing credentials. Companies House authentication codes and Government Gateway logins go stale. Retrieve them well before the deadline.
• Incorrect year-end dates. A period that doesn't match HMRC's records will be rejected outright.

Common Mistakes to Avoid During Digital Submission

Mismatched accounting periods are the most common reason for rejection: Companies House and HMRC must both hold the same dates. Next, confirm the dormant flag is genuinely selected inside the software rather than assumed. Finally, check that the statement of financial position carries the required director declarations — omit them and companies house dormant accounts get returned unfiled.

Example Scenario: Filing for a $0 Transaction Shell Company

Consider a company incorporated last year with one share issued and no bank movement. The wizard asks for the accounting period, confirms dormancy, and records share capital as issued but unpaid — a receivable from the subscriber, balancing the equity entry. No profit and loss figures are needed. Submission runs to HMRC and Companies House, and digital receipts typically arrive within minutes. Archive both confirmations.

Working through these in order removes most last-minute problems.

1. Gather credentials. You need a Government Gateway ID with Corporation Tax enrolled and your Companies House authentication code. Request replacements early — codes arrive by post to the registered office.
2. Verify dormancy. Review bank statements for the full period. A single bank charge or interest credit can end dormant status for Companies House purposes.
3. Choose recognized software. Confirm the provider appears on HMRC's recognized list and supports the standard you report under.
4. Run a trial pass. Complete the wizard and let validation flag iXBRL or period errors before you commit.
5. Submit and archive. Save the PDF confirmations and submission references for both agencies alongside your statutory records.

Where to Look Next for UK Tax Compliance

Start with official government guidance, which reflects legislative changes first — and note that searches for a corporations and charities filing system lead to overseas registries, not UK ones. For reporting judgment, consult the standard-setting bodies behind FRS 102 and FRS 105. For legal definitions of dormancy and directors' duties, UK company law texts remain the authoritative reference.

Frequently Asked Questions About CT600 Software

Can I file my CT600 online for free? No. HMRC's free service has closed, so commercial software is required.

What's the best hmrc ct600 software for a micro-entity? A specialist pay-per-filing tool with FRS 105 support and joint filing to Companies House.

How do I change status to dormant? Notify HMRC in writing or online; they'll confirm and stop issuing notices.

Understanding how to file dormant company accounts now starts with accepting one change: commercial software is mandatory for CT600 submission following the closure of HMRC's free service. That's an administrative shift, not a financial burden — a dormant company tax return still costs a fraction of an accounting retainer.

Three points are worth holding onto. Choose a tool that supports joint filing, so one dataset produces both the HMRC return and your company accounts for Companies House. Maintain dormant status with both bodies, because dormant company accounts hmrc records and Companies House records are separate. And recognize the limits — self-service filing fits micro-entities and shells, not complex groups.

Wefile handles dormant company accounts and CT600 filing through a guided wizard, with automated calculations and direct submission to HMRC and Companies House at a low per-filing price. Start your filing when you're ready.