- Companies
- Electricians
- McArthur & Son Ltd
McArthur & Son Ltd
- Company number
- SC494554
- Incorporated
- 8 Jan 201511 years trading
- Registered office
- 13 Cardiff Street, Millport, Isle of Cumbrae, KA28 0AS
- Nature of business
- Electrical installation
McArthur & Son Ltd is a 11-year-old private limited company registered in Isle of Cumbrae, company number SC494554, one of the UK's electrical contractors. 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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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 down £1,207 (-17.1%) on the year before, to £5,846.
- Net assets rose in 5 of 9 year-on-year comparisons on record.
- Current assets of £28K against £25K owed within a year: 1.1 times cover.
- No employees reported for the latest year (directors are often not counted as employees).
- 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 |
|---|---|---|---|---|---|
| 31 Jan 2025 | £5,846 | £28K | £25K | 0 | |
| 31 Jan 2024 | £7,053 | £26K | £22K | 3 | |
| 31 Jan 2023 | £8,149 | £18K | £14K | 3 | |
| 31 Jan 2022 | £21K | £26K | £9,643 | 3 | |
| 31 Jan 2021 | £31K | £38K | £14K | 3 | |
| 31 Jan 2020 | £19K | £16K | £6,966 | 3 | |
| 31 Jan 2019 | £12K | £10K | £1,095 | 3 | |
| 31 Jan 2018 | £5,219 | £7,906 | £5,748 | ||
| 31 Jan 2017 | £4,856 | £15K | £11K | ||
| 31 Jan 2016 | £4,631 | £1,814 | £8,832 | £5,764 |
Who runs and owns McArthur & Son Ltd
From the Companies House register. Individuals are shown by initials only; the full register is on Companies House.
Officers (2)
| Name | Role | Appointed |
|---|---|---|
| D*** M*** | Director | Jan 2015 |
| A*** D*** | Secretary | Jan 2015 |
Person with significant control
Where McArthur & Son Ltd is registered
The registered office is in Isle of Cumbrae (KA28), in the North Ayrshire local authority area, Scotland. Show KA28 0AS on a map.
Other trade companies in KA28
- Millport Roofing and Joinery LtdRoofers
- Gordon Lundie Electrical LtdElectricians
- Planet Renewables LtdMachinery repair and installation
- Derek Hagan Joinery Services LimitedJoiners and carpenters
- Newton Property LimitedBuilders
What happens if McArthur & Son 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
- SC494554
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 8 January 2015 (11 years ago)
- Registered office
- 13 Cardiff Street, Millport, Isle of Cumbrae, KA28 0AS
- Nature of business
- Electrical installation (SIC 43210)
- Year end
- 31 January (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 January 2025
- Last confirmation statement
- 8 January 2026
Filing notes for electrical contractors
Electrical contracting companies are often a director plus a van and tools. Most fall within the micro-entity rules, so the accounts filed at Companies House are short, and the CT600 carries the tax detail.
Similar companies
Other active electrical contractors.
Frequently asked questions
When are McArthur & Son Ltd's accounts due?
McArthur & Son Ltd's next accounts are due at Companies House by 31 October 2026 (in 18 days), covering the period to 31 January 2026.
When is McArthur & Son 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 McArthur & Son Ltd still trading?
McArthur & Son 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 McArthur & Son Ltd do?
McArthur & Son Ltd is registered under Electrical installation (SIC 43210).
How old is McArthur & Son Ltd?
McArthur & Son Ltd was incorporated on 8 January 2015, 11 years ago.
Who runs McArthur & Son Ltd?
McArthur & Son Ltd has 1 active director, the longest-serving appointed in Jan 2015. Their names and service addresses are on the Companies House register.
Who owns McArthur & Son Ltd?
One person or company has significant control of McArthur & Son Ltd: an individual (owns 75% or more of the shares).
What is the penalty if McArthur & Son 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 McArthur & Son 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.