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- MDF Rail Limited
Company profile · Civil engineering
MDF Rail Limited
MDF Rail Limited is a 10-year-old private limited company registered in Mountain Ash, company number 10225946, one of 12 civil engineering contractors in Mountain Ash. Its next accounts are due at Companies House on 31 March 2027, and the CT600 for the period to 30 June 2026 is due at HMRC on 30 June 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 30 June 2025, as filed at Companies House.
MDF Rail Limited over the years
From each year's balance sheet filed at Companies House. Small companies do not have to publish turnover or profit, so these are balance sheet figures.
- Net assets down £1,620 (-12.6%) on the year before, to £11K.
- Net assets rose in 4 of 8 year-on-year comparisons on record.
- Current assets of £9,932 against £7,048 owed within a year: 1.4 times cover.
- 1 employee on average during the year.
- Balance sheets on record for 9 years, 2017 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 30 Jun 2025 | £11K | £1 | £9,932 | £7,048 | 1 |
| 30 Jun 2024 | £13K | £1 | £16K | £15K | 1 |
| 30 Jun 2023 | £12K | £1 | £12K | £15K | 1 |
| 30 Jun 2022 | £18K | £1 | £2,026 | £3,221 | 1 |
| 30 Jun 2021 | £24K | £890 | £1,080 | £2,324 | 1 |
| 30 Jun 2020 | £293 | £4,700 | £4,700 | £12K | 1 |
| 30 Jun 2019 | £11K | £3,281 | £4,807 | £3,123 | 1 |
| 30 Jun 2018 | £3,416 | £5,734 | £8,749 | £5,333 | |
| 30 Jun 2017 | £2,625 | £5,222 | £8,089 | £5,464 |
Where MDF Rail Limited is registered
The registered office is in Mountain Ash (CF45), in the Rhondda Cynon Taf local authority area, Wales. Show CF45 3ND on a map.
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What happens if MDF Rail Limited 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 March 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Apr 2027 to 30 Apr 2027 | £150 |
| 1 to 3 months late | 1 May 2027 to 30 Jun 2027 | £375 |
| 3 to 6 months late | 1 Jul 2027 to 30 Sep 2027 | £750 |
| More than 6 months late | From 1 Oct 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Jul 2027 | £200 |
| 3 months late | 30 Sep 2027 | another £200 |
| 6 months late | 30 Dec 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 30 Jun 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
- 10225946
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 10 June 2016 (10 years ago)
- Registered office
- 5 Cilhaul Terrace, Mountain Ash, CF45 3ND
- Nature of business
- Construction of railways and underground railways (SIC 42120)
- Year end
- 30 June (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 30 June 2025
- Last confirmation statement
- 30 April 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 Mountain Ash
Other active civil engineering contractors registered in Mountain Ash.
- Prizm Engineering Ltd2025
- R Lewis Rail Services Limited2014
- Air Jointing Limited2026
- C&M Jones Groundworks Limited2020
- Dan Rail Welding Ltd2020
- DSR Groundworks Ltd2015
- Evanhalli Ltd2019
- I Fix Reinforcements Ltd2008
All civil engineering contractors in Mountain Ash · All trades in Mountain Ash · Civil engineering across the UK
Frequently asked questions
When are MDF Rail Limited's accounts due?
MDF Rail Limited's next accounts are due at Companies House by 31 March 2027 (in 170 days), covering the period to 30 June 2026.
When is MDF Rail Limited's CT600 due?
The CT600 for the period to 30 June 2026 is due at HMRC by 30 June 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 April 2027.
Is MDF Rail Limited still trading?
MDF Rail Limited 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 MDF Rail Limited do?
MDF Rail Limited is registered under Construction of railways and underground railways (SIC 42120).
How old is MDF Rail Limited?
MDF Rail Limited was incorporated on 10 June 2016, 10 years ago.
What is the penalty if MDF Rail Limited 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 MDF Rail Limited 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.