- Companies
- Civil engineering
- Wellingborough
- Boss Isaac Ltd
Boss Isaac Ltd
- Company number
- 16342294
- Incorporated
- 25 Mar 20251 year trading
- Registered office
- Flat 3 Excelsior Court, Scarborough Street, Wellingborough, NN9 5FE
- Nature of business
- Construction of roads and motorways; Other transportation support activities
Boss Isaac Ltd is a 1-year-old private limited company registered in Wellingborough, company number 16342294, one of 42 civil engineering contractors in Wellingborough. Its next accounts are due at Companies House on 31 December 2027, and the CT600 for the period to 31 March 2027 is due at HMRC on 31 March 2028.
Key dates
Worked out from the year end and filing history on the Companies House register.
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Financial snapshot, 2026
From the balance sheet at 31 March 2026, as filed at Companies House.
Where Boss Isaac Ltd is registered
The registered office is in Wellingborough (NN9), in the North Northamptonshire local authority area, East Midlands. Show NN9 5FE on a map.
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What happens if Boss Isaac 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 December 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Jan 2028 to 31 Jan 2028 | £150 |
| 1 to 3 months late | 1 Feb 2028 to 31 Mar 2028 | £375 |
| 3 to 6 months late | 1 Apr 2028 to 30 Jun 2028 | £750 |
| More than 6 months late | From 1 Jul 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Apr 2028 | £200 |
| 3 months late | 30 Jun 2028 | another £200 |
| 6 months late | 30 Sep 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Mar 2029 | 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
- 16342294
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 25 March 2025 (1 year ago)
- Registered office
- Flat 3 Excelsior Court, Scarborough Street, Wellingborough, NN9 5FE
- Nature of business
- Construction of roads and motorways (SIC 42110)
Other transportation support activities (SIC 52290) - Year end
- 31 March (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 March 2026
- Last confirmation statement
- 24 March 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 Wellingborough
Other active civil engineering contractors registered in Wellingborough.
- C & H Utilities Limited2021
- C J Civil Engineering Limited2024
- C R Scaife Limited2007
- CBM Telecom Ltd2024
- Civils and Remedials Limited2023
- CM Utilities (Northants) Limited2011
- Danjag Ltd2026
- Dnyg63 Ltd2026
All civil engineering contractors in Wellingborough · All trades in Wellingborough · Civil engineering across the UK
Frequently asked questions
When are Boss Isaac Ltd's accounts due?
Boss Isaac Ltd's next accounts are due at Companies House by 31 December 2027 (in 444 days), covering the period to 31 March 2027.
When is Boss Isaac Ltd's CT600 due?
The CT600 for the period to 31 March 2027 is due at HMRC by 31 March 2028, 12 months after the period end. The corporation tax itself is payable earlier, by 1 January 2028.
Is Boss Isaac Ltd still trading?
Boss Isaac 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 Boss Isaac Ltd do?
Boss Isaac Ltd is registered under Construction of roads and motorways (SIC 42110); Other transportation support activities (SIC 52290).
How old is Boss Isaac Ltd?
Boss Isaac Ltd was incorporated on 25 March 2025, 1 year ago.
What is the penalty if Boss Isaac 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 Boss Isaac 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.