- Companies
- Civil engineering
- London
- CS Rail Ltd
CS Rail Ltd
- Company number
- 15443233
- Incorporated
- 25 Jan 20242 years trading
- Registered office
- 101 New Cavendish Street, 1ST Floor South, London, United Kingdom, W1W 6XH
- Nature of business
- Construction of railways and underground railways
CS Rail Ltd is a 2-year-old private limited company registered in London, company number 15443233, one of 1,853 civil engineering contractors in London. Its next accounts are due at Companies House on 31 October 2026, and the CT600 for the period to 31 January 2026 is due at HMRC on 31 January 2027.
Key dates
Worked out from the year end and filing history on the Companies House register.
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Financial snapshot, 2025
From the balance sheet at 31 January 2025, as filed at Companies House.
Where CS Rail Ltd is registered
The registered office is in London (W1W), in the Westminster local authority area, London. Show W1W 6XH on a map.
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Shared registered office
152 companies on our pages use this registered office address. An address shared this widely is usually an accountant's office or a company formation agent's service address, not where the business trades from.
What happens if CS Rail Ltd files late
Companies House charges an automatic penalty the day after the deadline, and it rises the longer the accounts are late. These are the dates for this company's accounts due on 31 October 2026.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Nov 2026 to 30 Nov 2026 | £150 |
| 1 to 3 months late | 1 Dec 2026 to 31 Jan 2027 | £375 |
| 3 to 6 months late | 1 Feb 2027 to 30 Apr 2027 | £750 |
| More than 6 months late | From 1 May 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Feb 2027 | £200 |
| 3 months late | 30 Apr 2027 | another £200 |
| 6 months late | 31 Jul 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Jan 2028 | another 10% of any unpaid tax |
For returns filed on or after 1 April 2026. Late three times in a row and the £200 penalties become £1,000 each.
Company details
As held on the Companies House register.
- Company number
- 15443233
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 25 January 2024 (2 years ago)
- Registered office
- 101 New Cavendish Street, 1ST Floor South, London, United Kingdom, W1W 6XH
- Nature of business
- Construction of railways and underground railways (SIC 42120)
- Year end
- 31 January (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 January 2025
- Last confirmation statement
- 7 February 2026
Filing notes for civil engineering contractors
Civil engineering contractors usually carry plant and machinery, so capital allowances (the annual investment allowance and the main pool) do much of the work in the corporation tax computation.
Similar companies in London
Other active civil engineering contractors registered in London.
- CSJ Specialist Surveyors Ltd2025
- Cso Omega Limited2002
- CT 11991948 Limited2019
- CTK Engineering Limited2026
- Ctlo Ltd2025
- Ctori Construction Consultants Limited2008
- Ctori Holdings Limited2003
- Culham Renewables Ltd2013
All civil engineering contractors in London · All trades in London · Civil engineering across the UK
Frequently asked questions
When are CS Rail Ltd's accounts due?
CS Rail Ltd's next accounts are due at Companies House by 31 October 2026 (in 19 days), covering the period to 31 January 2026.
When is CS Rail Ltd's CT600 due?
The CT600 for the period to 31 January 2026 is due at HMRC by 31 January 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 November 2026.
Is CS Rail Ltd still trading?
CS Rail Ltd is listed as active on the Companies House register as of 1 Oct 2026. Active means it has not been dissolved or entered insolvency; it does not show whether it is currently taking on work.
What does CS Rail Ltd do?
CS Rail Ltd is registered under Construction of railways and underground railways (SIC 42120).
How old is CS Rail Ltd?
CS Rail Ltd was incorporated on 25 January 2024, 2 years ago.
What is the penalty if CS Rail Ltd files its accounts late?
Companies House charges £150 if the accounts are up to 1 month late, £375 up to 3 months, £750 up to 6 months and £1,500 after that, doubled if the previous year's accounts were also late. HMRC charges £200 for a CT600 filed a day late and another £200 at 3 months.
Official records
View CS Rail Ltd on Companies House for filed documents, officers and the full history.
Based on the Companies House register (snapshot 1 Oct 2026). Deadlines are worked out from the register and assume a standard accounting period; a change of year end or a short period moves them. This page is general information, not tax or accountancy advice.