- Companies
- Civil engineering
- Aberystwyth
- M T Byrne Ltd
M T Byrne Ltd
- Company number
- 05998909
- Incorporated
- 15 Nov 200619 years trading
- Registered office
- Haven View Salem, Penrhyncoch, Aberystwyth, Ceredigion, SY23 3ET
- Nature of business
- Construction of utility projects for electricity and telecommunications
M T Byrne Ltd is a 19-year-old private limited company registered in Aberystwyth, company number 05998909, one of the UK's civil engineering contractors. Its next accounts are due at Companies House on 31 August 2027, and the CT600 for the period to 30 November 2026 is due at HMRC on 30 November 2027.
Key dates
Worked out from the year end and filing history on the Companies House register.
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Finances
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 up £7,268 (+8%) on the year before, to £98K.
- Net assets rose in 5 of 9 year-on-year comparisons on record.
- Current assets of £55K against £124K owed within a year: 0.4 times cover.
- 1 employee on average, down from 2 the year before.
- Balance sheets on record for 10 years, 2016 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 30 Nov 2025 | £98K | £55K | £124K | 1 | |
| 30 Nov 2024 | £91K | £41K | £122K | 2 | |
| 30 Nov 2023 | £47K | £35K | £119K | 2 | |
| 30 Nov 2022 | £45K | £31K | £93K | 2 | |
| 30 Nov 2021 | £59K | £22K | £94K | 2 | |
| 30 Nov 2020 | £76K | £85K | £131K | 2 | |
| 30 Nov 2019 | £44K | £16K | £104K | 2 | |
| 30 Nov 2018 | £49K | £33K | £130K | ||
| 30 Nov 2017 | £60K | £42K | £108K | ||
| 30 Nov 2016 | £55K | £28K | £55K | £93K |
Where M T Byrne Ltd is registered
The registered office is in Aberystwyth (SY23), in the Ceredigion local authority area, Wales. Show SY23 3ET on a map.
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What happens if M T Byrne 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 August 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Sep 2027 to 30 Sep 2027 | £150 |
| 1 to 3 months late | 1 Oct 2027 to 30 Nov 2027 | £375 |
| 3 to 6 months late | 1 Dec 2027 to 29 Feb 2028 | £750 |
| More than 6 months late | From 1 Mar 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Dec 2027 | £200 |
| 3 months late | 29 Feb 2028 | another £200 |
| 6 months late | 30 May 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 30 Nov 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
- 05998909
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 15 November 2006 (19 years ago)
- Registered office
- Haven View Salem, Penrhyncoch, Aberystwyth, Ceredigion, SY23 3ET
- Nature of business
- Construction of utility projects for electricity and telecommunications (SIC 42220)
- Year end
- 30 November (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 30 November 2025
- Last confirmation statement
- 15 November 2025
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 Aberystwyth
Other active civil engineering contractors registered in Aberystwyth.
All civil engineering contractors in Aberystwyth · All trades in Aberystwyth · Civil engineering across the UK
Frequently asked questions
When are M T Byrne Ltd's accounts due?
M T Byrne Ltd's next accounts are due at Companies House by 31 August 2027 (in 322 days), covering the period to 30 November 2026.
When is M T Byrne Ltd's CT600 due?
The CT600 for the period to 30 November 2026 is due at HMRC by 30 November 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 September 2027.
Is M T Byrne Ltd still trading?
M T Byrne 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 M T Byrne Ltd do?
M T Byrne Ltd is registered under Construction of utility projects for electricity and telecommunications (SIC 42220).
How old is M T Byrne Ltd?
M T Byrne Ltd was incorporated on 15 November 2006, 19 years ago.
What is the penalty if M T Byrne 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 M T Byrne 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.