FileMyLtd guideshttps://filemyltd.co.uk/guides/Guides for UK directors filing their own company accounts and tax returns.en-gbCompanies House authentication code: what it is and how to get onehttps://filemyltd.co.uk/guides/companies-house-authentication-code/https://filemyltd.co.uk/guides/companies-house-authentication-code/Fri, 06 Nov 2026 00:00:00 GMTWhat the 6-character Companies House authentication code is, where to find it, how to request a new one and how long it takes to arrive.Companies House identity verification: what directors need to dohttps://filemyltd.co.uk/guides/companies-house-identity-verification/https://filemyltd.co.uk/guides/companies-house-identity-verification/Fri, 06 Nov 2026 00:00:00 GMTIdentity verification has been law since 18 November 2025. When existing directors must verify, how to do it free with GOV.UK One Login, and the personal code.Companies House late filing penalties: how much, and how to avoid themhttps://filemyltd.co.uk/guides/companies-house-late-filing-penalties/https://filemyltd.co.uk/guides/companies-house-late-filing-penalties/Fri, 06 Nov 2026 00:00:00 GMTCompanies House late filing penalties run from £150 to £1,500 for a private company and double if you're late two years running. Full table and appeal rules.Corporation tax deadlines: when to pay and when to file the CT600https://filemyltd.co.uk/guides/corporation-tax-deadlines/https://filemyltd.co.uk/guides/corporation-tax-deadlines/Fri, 06 Nov 2026 00:00:00 GMTCorporation tax is paid 9 months and 1 day after the period ends and the CT600 filed 12 months after. Worked dates, penalties from April 2026 and interest.Do you need an accountant for a limited company?https://filemyltd.co.uk/guides/do-i-need-an-accountant-for-a-limited-company/https://filemyltd.co.uk/guides/do-i-need-an-accountant-for-a-limited-company/Fri, 06 Nov 2026 00:00:00 GMTNo law requires a limited company to use an accountant. When directors can file their own accounts and CT600, and when an accountant is worth paying for.How to find your company UTR (Corporation Tax reference)https://filemyltd.co.uk/guides/find-company-utr/https://filemyltd.co.uk/guides/find-company-utr/Fri, 06 Nov 2026 00:00:00 GMTYour company UTR is a 10-digit Corporation Tax reference from HMRC. Where it appears, how to request a copy online and how long it takes to arrive.Micro-entity thresholds: does your company qualify?https://filemyltd.co.uk/guides/micro-entity-thresholds/https://filemyltd.co.uk/guides/micro-entity-thresholds/Fri, 06 Nov 2026 00:00:00 GMTMicro-entity limits rose for periods from 6 April 2025: £1m turnover, £500,000 balance sheet, 10 employees. How the two-of-three test works, with examples.What is a dormant company? The Companies House and HMRC ruleshttps://filemyltd.co.uk/guides/what-is-a-dormant-company/https://filemyltd.co.uk/guides/what-is-a-dormant-company/Fri, 06 Nov 2026 00:00:00 GMTA dormant company has no significant transactions. The two tests, Companies House and HMRC, what still has to be filed, and when to tell HMRC.