UK LTD Annual Compliance Calendar 2026 — Key Deadlines Every Polish Director Must Track
Running a UK LTD from Poland? Here’s Your 2026 Compliance Timeline
Polish entrepreneurs running UK Limited companies often underestimate the annual compliance rhythm required by Companies House and HMRC. Missing a deadline can mean penalties starting at £150 and escalating to £1,500+. This calendar maps out every critical date your LTD must hit in 2026.
The Annual LTD Compliance Cycle
| Obligation | Deadline | Filed With | Cost |
|---|---|---|---|
| Confirmation Statement (CS01) | Anniversary of incorporation + 14 days | Companies House | £34 online |
| Annual Accounts | 9 months after accounting reference date | Companies House | Included in accounting fee |
| Corporation Tax Return (CT600) | 12 months after accounting period ends | HMRC | Included in accounting fee |
| Corporation Tax Payment | 9 months + 1 day after accounting period ends | HMRC | 19-25% of taxable profit |
| VAT Returns (if registered) | Quarterly (1 month + 7 days after period) | HMRC | Varies |
| Director Identity Verification (NEW 2026) | Before ~November 2026 | Companies House | Free (direct) or ACSP fee |
Example: LTD Incorporated 15 March 2025
- Confirmation Statement: Due by 29 March 2026 (15 March + 14 days)
- Accounting Reference Date: 31 March 2026 (end of month of incorporation)
- Annual Accounts deadline: 31 December 2026 (31 March + 9 months)
- CT600 deadline: 31 March 2027 (31 March 2026 + 12 months)
- Corporation Tax payment: 1 January 2027 (31 March 2026 + 9 months + 1 day)
⚠️ Critical 2026 Changes
- CT600 — software-only filing from April 2026: HMRC shut down its free joint filing service. You MUST use commercial software (or an accountant) to file your Corporation Tax return.
- Identity Verification: All directors and PSCs must verify identity via GOV.UK One Login or an ACSP by ~November 2026.
- Companies House new powers: CH can now query filings, reject documents, and impose penalties — stricter scrutiny across all submissions.
3 Costly Mistakes to Avoid
- Confusing the deadlines — Annual Accounts (Companies House) and CT600 (HMRC) have DIFFERENT deadlines
- Filing Annual Accounts but forgetting Corporation Tax — they are separate obligations to separate bodies
- Missing the CT600 software requirement — you can no longer file CT600 for free via the old HMRC portal from April 2026
How Semper Paratus Keeps You Compliant
Our accounting service (from 400 PLN/month for companies without employees) tracks all deadlines, prepares and files Annual Accounts, CT600, and Confirmation Statement — so you never miss a date.
📞 Book a free compliance review:
🔗 https://calendly.com/semperparatus/
📧 [email protected]
📱 +48 530 447 230 | +44 745 638 6117
📍 42-44 Bishopsgate, EC2N 4AH, London
