- Companies
- Motor traders
- Hayes
- Sianautos Limited
Sianautos Limited
- Company number
- 17414526
- Incorporated
- 21 Aug 2026
- Registered office
- 20 Betam Road, Hayes, UB3 1ST
- Nature of business
- Retail trade of motor vehicle parts and accessories
Sianautos Limited is a newly incorporated private limited company registered in Hayes, company number 17414526, one of 135 motor trade companies in Hayes. Its next accounts are due at Companies House on 21 May 2028, and its first CT600 is due at HMRC on 20 August 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 Sianautos Limited is registered
The registered office is in Hayes (UB3), in the Hillingdon local authority area, London. Show UB3 1ST on a map.
Other trade companies in UB3
- Rennove LimitedProperty developers
- KSJ Design & Build LtdBuilders
- KCRQ LimitedCleaning companies
- HKR Roofing LtdRoofers
- Syg Development Group LtdProperty developers
- Ironspan Industrial Services LtdMachinery repair and installation
- RK9 LimitedBuilders
- Elite Construction and Roofing LimitedBuilders
What happens if Sianautos 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 21 May 2028.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 22 May 2028 to 21 Jun 2028 | £150 |
| 1 to 3 months late | 22 Jun 2028 to 21 Aug 2028 | £375 |
| 3 to 6 months late | 22 Aug 2028 to 21 Nov 2028 | £750 |
| More than 6 months late | From 22 Nov 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Sep 2028 | £200 |
| 3 months late | 30 Nov 2028 | another £200 |
| 6 months late | 28 Feb 2029 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Aug 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
- 17414526
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 21 August 2026
- Registered office
- 20 Betam Road, Hayes, UB3 1ST
- Nature of business
- Retail trade of motor vehicle parts and accessories (SIC 45320)
- Year end
- 31 August (accounting reference date)
- Accounts type
- No accounts filed yet
Filing notes for motor trade companies
Motor trade companies hold vehicle stock, and how that stock is valued at the year end moves the profit directly. Some use the VAT margin scheme.
Similar companies in Hayes
Other active motor trade companies registered in Hayes.
- Simma Enterprises Ltd2025
- Spark & Soul Ltd2025
- SRK Motor Sales Limited2026
- Ssell4You Ltd2020
- Sservice Bay Ltd2026
- Starlux Travels Ltd2026
- Superior Auto Seat Covers Ltd2019
- Technology Demands Ltd2024
All motor trade companies in Hayes · All trades in Hayes · Motor traders across the UK
Frequently asked questions
When are Sianautos Limited's accounts due?
Sianautos Limited's next accounts are due at Companies House by 21 May 2028 (in 586 days), covering the period to 31 August 2027.
When is Sianautos Limited's CT600 due?
The first accounts cover more than 12 months, so there are two Company Tax Returns: one for the 12 months to 20 August 2027, due by 20 August 2028, and one for the period to 31 August 2027, due by 31 August 2028. Corporation tax is payable 9 months and 1 day after the end of each.
Is Sianautos Limited still trading?
Sianautos 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 Sianautos Limited do?
Sianautos Limited is registered under Retail trade of motor vehicle parts and accessories (SIC 45320).
How old is Sianautos Limited?
Sianautos Limited was incorporated on 21 August 2026, less than a year ago.
What is the penalty if Sianautos 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 Sianautos 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.