- Companies
- Mechanics and garages
- Doncaster
- Arn Diagnostics Limited
Arn Diagnostics Limited
- Company number
- 08405544
- Incorporated
- 15 Feb 201313 years trading
- Registered office
- 32 Mulberry Way, Armthorpe, Doncaster, DN3 3UE
- Nature of business
- Maintenance and repair of motor vehicles
Arn Diagnostics Limited is a 13-year-old private limited company registered in Doncaster, company number 08405544, one of 271 vehicle repair garages in Doncaster. Its next accounts are due at Companies House on 30 November 2026, and the CT600 for the period to 28 February 2026 is due at HMRC on 28 February 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 £18K (-27.6%) on the year before, to £46K.
- Net assets rose in 7 of 9 year-on-year comparisons on record.
- Current assets of £73K against £88K owed within a year: 0.8 times cover.
- 9 employees on average during the year.
- 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 |
|---|---|---|---|---|---|
| 28 Feb 2025 | £46K | £73K | £88K | 9 | |
| 28 Feb 2024 | £64K | £78K | £93K | 9 | |
| 28 Feb 2023 | £73K | £76K | £84K | 9 | |
| 28 Feb 2022 | £67K | £57K | £57K | 8 | |
| 28 Feb 2021 | £52K | £43K | £49K | 7 | |
| 28 Feb 2020 | £37K | £24K | £34K | 7 | |
| 28 Feb 2019 | £30K | £16K | £29K | ||
| 28 Feb 2018 | £19K | £13K | £29K | ||
| 28 Feb 2017 | £13K | £16K | £21K | ||
| 29 Feb 2016 | £13K | £6,842 | £14K | £22K |
Where Arn Diagnostics Limited is registered
The registered office is in Doncaster (DN3), in the Doncaster local authority area, Yorkshire and The Humber. Show DN3 3UE on a map.
Other trade companies in DN3
- Oak & Prosper York LimitedProperty developers
- ST Leger Paving LimitedInstallers
- Lucent Electrical LtdElectricians
- Alfa Scaffolding & Brickwork LimitedCivil engineering
- Hso Fastfit Tyres LtdMechanics and garages
- Cheri Valley Construction Co LtdInstallers
- Razor Sharp Interiors LtdFinishing trades
- Reebuilt LimitedInstallers
Shared registered office
28 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 Arn Diagnostics 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 30 November 2026.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Dec 2026 to 31 Dec 2026 | £150 |
| 1 to 3 months late | 1 Jan 2027 to 28 Feb 2027 | £375 |
| 3 to 6 months late | 1 Mar 2027 to 31 May 2027 | £750 |
| More than 6 months late | From 1 Jun 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Mar 2027 | £200 |
| 3 months late | 28 May 2027 | another £200 |
| 6 months late | 28 Aug 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 28 Feb 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
- 08405544
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 15 February 2013 (13 years ago)
- Registered office
- 32 Mulberry Way, Armthorpe, Doncaster, DN3 3UE
- Nature of business
- Maintenance and repair of motor vehicles (SIC 45200)
- Year end
- 28 February (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 28 February 2025
- Last confirmation statement
- 15 February 2026
Filing notes for vehicle repair garages
Garages hold parts stock and often own diagnostic equipment and ramps, which qualify for capital allowances.
Similar companies in Doncaster
Other active vehicle repair garages registered in Doncaster.
- Asd MOT Ltd2016
- Ashley Barrow Ltd2022
- Askern Road Garage Limited2021
- Auto Technics Ltd2009
- Autofinish Ltd2000
- Autoshine Balby Ltd2017
- Axholme Services Ltd2025
- Ayla GRP Ltd2023
All vehicle repair garages in Doncaster · All trades in Doncaster · Mechanics and garages across the UK
Frequently asked questions
When are Arn Diagnostics Limited's accounts due?
Arn Diagnostics Limited's next accounts are due at Companies House by 30 November 2026 (in 49 days), covering the period to 28 February 2026.
When is Arn Diagnostics Limited's CT600 due?
The CT600 for the period to 28 February 2026 is due at HMRC by 28 February 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 December 2026.
Is Arn Diagnostics Limited still trading?
Arn Diagnostics 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 Arn Diagnostics Limited do?
Arn Diagnostics Limited is registered under Maintenance and repair of motor vehicles (SIC 45200).
How old is Arn Diagnostics Limited?
Arn Diagnostics Limited was incorporated on 15 February 2013, 13 years ago.
What is the penalty if Arn Diagnostics 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 Arn Diagnostics 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.