- Companies
- Electricians
- London
- Tsi International UK, Ltd
Tsi International UK, Ltd
- Company number
- 17173857
- Incorporated
- 22 Apr 2026
- Registered office
- Cannongate House, 62-64 Cannon Street, Fifth Floor, London, United Kingdom, EC4N 6AE
- Nature of business
- Electrical installation; Information technology consultancy activities; Other information technology service activities; Security systems service activities
Tsi International UK, Ltd is a newly incorporated private limited company registered in London, company number 17173857, one of 3,448 electrical contractors in London. Its next accounts are due at Companies House on 30 September 2027, and its first CT600 is due at HMRC on 21 April 2028.
Key dates
This company has not filed accounts yet. First accounts are due 21 months after incorporation, and the first period can run longer than a year.
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Where Tsi International UK, Ltd is registered
The registered office is in London (EC4N), in the City of London local authority area, London. Show EC4N 6AE on a map.
Other trade companies in EC4N
- GLD Homes He LimitedProperty developers
- Kim & Blue Construction LtdPlasterers
- Autron UK LimitedCivil engineering
- GLD Homes RG LimitedProperty developers
- GLD Homes Ac LimitedProperty developers
- GLD Homes Ma LimitedProperty developers
- GLD Homes CG LimitedProperty developers
- Mec UK Logistics 3 LimitedProperty developers
What happens if Tsi International UK, 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 30 September 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Oct 2027 to 31 Oct 2027 | £150 |
| 1 to 3 months late | 1 Nov 2027 to 31 Dec 2027 | £375 |
| 3 to 6 months late | 1 Jan 2028 to 31 Mar 2028 | £750 |
| More than 6 months late | From 1 Apr 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Jan 2029 | £200 |
| 3 months late | 31 Mar 2029 | another £200 |
| 6 months late | 30 Jun 2029 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Dec 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
- 17173857
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 22 April 2026
- Registered office
- Cannongate House, 62-64 Cannon Street, Fifth Floor, London, United Kingdom, EC4N 6AE
- Nature of business
- Electrical installation (SIC 43210)
Information technology consultancy activities (SIC 62020)
Other information technology service activities (SIC 62090)
Security systems service activities (SIC 80200) - Year end
- 31 December (accounting reference date)
- Accounts type
- No accounts filed yet
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 in London
Other active electrical contractors registered in London.
- TSJ Building Services (Electrical) Ltd2011
- TT Building Contractors Limited2008
- TTK Electrical Ltd2018
- Turquoise Tech Limited2025
- TVC Electrical Limited2026
- TWH Property Maintenance Ltd2025
- Twyford Property Management Services Ltd2019
- Tyne Wear Solar Ltd2026
All electrical contractors in London · All trades in London · Electricians across the UK
Frequently asked questions
When are Tsi International UK, Ltd's accounts due?
Tsi International UK, Ltd's next accounts are due at Companies House by 30 September 2027 (in 352 days), covering the period to 31 December 2027.
When is Tsi International UK, Ltd's CT600 due?
The first accounts cover more than 12 months, so there are two Company Tax Returns: one for the 12 months to 21 April 2027, due by 21 April 2028, and one for the period to 31 December 2027, due by 31 December 2028. Corporation tax is payable 9 months and 1 day after the end of each.
Is Tsi International UK, Ltd still trading?
Tsi International UK, 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 Tsi International UK, Ltd do?
Tsi International UK, Ltd is registered under Electrical installation (SIC 43210); Information technology consultancy activities (SIC 62020); Other information technology service activities (SIC 62090); Security systems service activities (SIC 80200).
How old is Tsi International UK, Ltd?
Tsi International UK, Ltd was incorporated on 22 April 2026, less than a year ago.
What is the penalty if Tsi International UK, 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 Tsi International UK, 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.