# PromptFiling > Deadline watcher and self-serve dormant accounts filing for the smallest UK > companies. Free reminders for accounts and confirmation-statement deadlines; > dormant accounts prepared, approved by the director, and filed for £19.99. > Independent tool — not connected to Companies House or HMRC. Answers reviewed 2026-08-14 against gov.uk and legislation.gov.uk. Key verified facts: - A private company's accounts are due 9 months after year end; late-filing penalties run £150 / £375 / £750 / £1,500 by lateness band and DOUBLE when accounts are late two years running. - Companies House becomes software-only for ALL accounts on 1 April 2028 (announced 9 June 2026; WebFiling stays free for dormant and micro accounts until then). The free joint HMRC/Companies House CT600 service closed 31 March 2026. - "Dormant" is TWO different legal tests: Companies House looks at recorded transactions (a bank charge breaks dormancy); HMRC looks at activity and income. A company can be dormant for one and not the other. - Micro-entity thresholds (FY starting on/after 6 April 2025): two of — turnover ≤ £1m, gross assets ≤ £500k, ≤ 10 employees. - If HMRC has served a notice to deliver a Company Tax Return, comply unless HMRC withdraws that notice. Reporting dormancy does not itself withdraw it. ## Guides - [How to file dormant company accounts](https://promptfiling.co.uk/guides/file-dormant-company-accounts/): What dormant accounts contain, who qualifies, the deadline and the penalty — and the three ways to file them in 2026. - [Companies House software-only filing from 1 April 2028](https://promptfiling.co.uk/guides/companies-house-software-only-2028/): What the 2028 accounts changes are, who they hit, and what to do before the free web route closes. - [How to get your Companies House authentication code](https://promptfiling.co.uk/guides/companies-house-authentication-code/): The 6-character code every online filing needs: how to request it, why it arrives by post, and what to do when your deadline is closer than ten working days. - [The confirmation statement: deadline, £50 fee, and what overdue really means](https://promptfiling.co.uk/guides/confirmation-statement/): Every company files one at least every 12 months, dormant or not. The dates, the fee, and what actually happens when it goes overdue. - [The Companies House personal code: who needs one and when](https://promptfiling.co.uk/guides/companies-house-personal-code/): The 11-character code you get after verifying your identity — what it is for, the ECCTA deadlines, and how it differs from the company authentication code. - [Companies House late filing penalties: £150 to £1,500, automatically](https://promptfiling.co.uk/guides/late-filing-penalties/): The penalty bands, the doubling rule, why rejected accounts still count as late — and what appeals actually succeed. - [What is a dormant company?](https://promptfiling.co.uk/guides/what-is-a-dormant-company/): The transaction test Companies House actually applies, what breaks dormancy, and what a dormant company still has to file every year. - [Extending your accounts filing deadline: before, not after](https://promptfiling.co.uk/guides/extend-accounts-filing-deadline/): More time is possible only BEFORE the deadline, and only for reasons outside your control. What qualifies, how to apply, and the ARD move people confuse it with. - [Form AA02: the dormant accounts paper form, and when not to use it](https://promptfiling.co.uk/guides/form-aa02-dormant-accounts/): AA02 covers one narrow case — never-traded companies limited by shares. What the form contains, who cannot use it, and why paper is the slow lane. - [Dormant for Companies House vs dormant for HMRC](https://promptfiling.co.uk/guides/dormant-companies-house-vs-hmrc/): Two different legal tests share one word — and mixing them up produces wrong filings. The difference in plain English. - [Micro-entity accounts: who qualifies, what you file, and what 2028 changes](https://promptfiling.co.uk/guides/micro-entity-accounts/): The two-of-three test, what the accounts actually contain, and the line between micro-entity and dormant that decides which set you file. - [Changing your accounting reference date: what it does to your filing deadline](https://promptfiling.co.uk/guides/change-accounting-reference-date/): Shortening the year resets the accounts deadline to 3 months from the notice; lengthening is rationed to once every 5 years. The rules, the limits and the side effects. ## FAQ - [Guides & FAQ hub](https://promptfiling.co.uk/guides/): 26 questions across 6 topics, each answered in the first sentence with the number or date in it ## Tools - [Deadline checker](https://promptfiling.co.uk/check/): company number or name in — both Companies House dates out, accounts and confirmation statement, with the penalty for missing each; free, no account - [Dormant accounts filing](https://promptfiling.co.uk/dormant-accounts-filing/): the paid service — prepared from a short interview, approved by the director, filed and chased to acceptance - [Pricing](https://promptfiling.co.uk/pricing/): watching free forever; one one-off price for the filing, refund terms published - [Deadline reminders](https://promptfiling.co.uk/companies-house-deadline-reminders/): the free product — both statutory clocks, reminders at 90/30/7 days and urgently - MCP server (Model Context Protocol, streamable HTTP): POST https://mcp.promptfiling.co.uk/ — tools: check_company_deadlines (live register lookup), uk_late_filing_penalties (static table); anonymous, read-only, rate-limited - [Security & verification](https://promptfiling.co.uk/security/): our tamper-evident audit chain, publicly verifiable at /api/audit/verify/ - [Why did I get a letter?](https://promptfiling.co.uk/why-this-letter/): what our postal letters are, how to verify the sender against the public register, and the one-click permanent opt-out - [Pricing, terms and refunds](https://promptfiling.co.uk/terms/): deadline watching is free forever; a dormant-accounts filing is £19.99 once, no subscription — refund states at /refunds/ - [Po polsku](https://promptfiling.co.uk/pl/): guides in Polish for Polish-speaking directors of UK companies; a Polish speaker answers hello@promptfiling.co.uk ## Optional - [Full content for LLMs](https://promptfiling.co.uk/llms-full.txt): every question, answer and guide in one file