Guides
Written for directors who file their own company's accounts and tax return. Every guide cites GOV.UK, Companies House or HMRC, with the date it was checked.
All guides
Companies House identity verification: what directors need to do
Every company director must verify their identity with Companies House. New directors verify before appointment; existing directors give their 11-character personal code in the company's next confirmation statement after 18 November 2025. Verification is free through GOV.UK One Login, or done for a fee by an authorised agent.
6 Nov 2026Read → Companies HouseCompanies House authentication code: what it is and how to get one
What 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.
6 Nov 2026Read → Companies HouseCompanies House late filing penalties: how much, and how to avoid them
Companies 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.
6 Nov 2026Read → Dormant companiesWhat is a dormant company? The Companies House and HMRC rules
A dormant company has no significant transactions. The two tests, Companies House and HMRC, what still has to be filed, and when to tell HMRC.
6 Nov 2026Read → Corporation TaxCorporation tax deadlines: when to pay and when to file the CT600
Corporation 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.
6 Nov 2026Read → Corporation TaxHow to find your company UTR (Corporation Tax reference)
Your 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.
6 Nov 2026Read → Company accountsMicro-entity thresholds: does your company qualify?
Micro-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.
6 Nov 2026Read → Company accountsDo you need an accountant for a limited company?
No 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.
6 Nov 2026Read → Free toolCorporation tax calculator 2026/27
Work out corporation tax with marginal relief, associated companies and short periods, with HMRC's working shown.
ToolOpen →Create an account, add your company from the Companies House register and see your deadlines in a couple of minutes. FileMyLtd is in early access. Accounts and tax returns are being tested with Companies House and HMRC; live filing opens to early-access members first.