Companies House incorporates hundreds of thousands of new limited companies every year, yet many directors assume formation itself completes their legal obligations. In reality, the first statutory deadline can fall due within days of a company starting to trade.
In this blog, we discuss what the ongoing filing obligations for a UK private limited company are. We cover confirmation statements, annual accounts, Corporation Tax and event-driven filings. We also explain the penalties that follow missed deadlines, so directors can plan their first year with confidence.
What Are the Ongoing Filing Obligations for a UK Private Limited Company?
A UK private limited company must file a confirmation statement and annual accounts with Companies House each year. Corporation Tax returns and payments to HM Revenue and Customs (HMRC) sit alongside these Companies House filings.
Once a company is incorporated at Companies House, it enters a permanent cycle of statutory reporting. The obligations sit with two regulators: Companies House, which maintains the public register, and HMRC, which administers tax. Directors who understand this split from day one rarely miss a deadline.
Under the Economic Crime and Corporate Transparency Act, identity verification for directors and People with Significant Control has applied since 18 November 2025. A director who has not verified their identity can face restrictions on making other filings. Verification is therefore best treated as item one on any new company's to-do list.
Many founders first ask how long company incorporation in the UK takes, but the bigger question is what follows formation. Others weigh whether a limited company or an LLP is the better fit before committing, because compliance duties differ between the two structures.
A complete UK post-incorporation compliance checklist covers the recurring deadlines below, before any event-driven or tax registrations are added. Each is examined in detail in the sections that follow, and businesses that want hands-on support can contact our team for a tailored compliance calendar.
When Is the Confirmation Statement Filing Deadline in the UK?
The confirmation statement (form CS01) is due at least once every 12 months, with a 14-day filing window opening at the end of each review period.
The review period runs for 12 months from the date of incorporation. If a statement has already been filed, it runs from the date to which that statement was made up. Once a review period ends, the company has 14 days to deliver the statement to Companies House. The current filing fee is £50 online or £110 on paper.
A company must file the statement even if nothing has changed. Confirming that the register remains accurate is itself the purpose of the filing. There is no automatic fixed penalty for lateness, but Companies House treats persistent non-filing as evidence that the company is no longer operating. The registrar can then begin strike-off proceedings, which start with a public notice in The Gazette. Filing restrictions can also apply under the new identity rules.
Step 1: Diarise the review period end date
Set a reminder for the date the 12-month review period closes. This is the date from which the 14-day filing window runs, not the incorporation anniversary of a filing already made.
Step 2: Check and update company information
Review the registered office, directors, PSC details and share capital recorded on the register. In practice, we help clients run this check monthly so the statement becomes a formality rather than an investigation.
Step 3: File form CS01 and pay the fee
Submit the statement online and pay the £50 fee. Filing early within the window avoids last-minute rejections caused by verification or data issues.
What Is the Corporation Tax Filing Deadline in the UK?
Companies with taxable profits of up to £1.5 million must pay Corporation Tax within nine months and one day of the accounting period end, while large companies normally pay by instalments. The Company Tax Return (form CT600) is due within 12 months of the same date.
This gap catches many first-time directors: the payment falls due before the return. According to HMRC, a company must also notify that it is chargeable to Corporation Tax within three months of starting business activity. Business activity includes invoicing clients, signing commercial contracts, advertising services, employing staff or earning interest on company funds. Incorporation alone does not start the clock.
Filing the CT600 requires the company's unique taxpayer reference (UTR), which HMRC posts to the registered office after registration. Losing that letter is one of the most common reasons directors approach us for help recovering the reference before a deadline.
1. Register as chargeable within three months
Notify HMRC once the company begins trading. The notice period runs from the first business activity, not from the incorporation date. Late notification can attract a penalty based on potential lost revenue.
2. Pay the tax by nine months and one day
For most companies, the payment deadline falls after the accounting period ends, but large companies normally make instalment payments before and after that date. Late payment of Corporation Tax accrues interest. For returns with filing dates on or after 1 April 2026, a late CT600 attracts a £200 fixed penalty at one day late and another £200 after three months, with percentage penalties applying after longer delays. Most companies therefore provision for tax monthly.
3. File the CT600 within 12 months
The return is due up to 12 months after the accounting period ends. Even a nil return must be filed, and the figures must agree with the accounts lodged at Companies House.
Core Annual Filing Deadlines for a UK Limited Company
| Obligation | Deadline | Filed with |
|---|---|---|
| Confirmation statement (CS01) | Every 12 months, plus a 14-day filing window | Companies House |
| First annual accounts | 21 months from incorporation | Companies House |
| Subsequent annual accounts | 9 months after the accounting reference date | Companies House |
| Notify chargeability to Corporation Tax | Within 3 months of starting to trade | HMRC |
| Corporation Tax payment | 9 months and 1 day after the accounting period end | HMRC |
| Company Tax Return (CT600) | 12 months after the accounting period end | HMRC |
| VAT registration (if applicable) | Within 30 days of exceeding the £90,000 threshold | HMRC |
What Are the Companies House Late Filing Penalties?
Late accounts penalties run from £150 to £1,500. They double if the company was also late the previous year, while a late confirmation statement instead triggers strike-off risk and filing restrictions.
Penalties for late annual accounts are automatic and civil. They are charged the moment the filing deadline passes, regardless of whether the company traded or made a profit. The filing deadlines that trigger these penalties, and the separate HMRC charges that stack on top, are set out below.
Which Event-Driven Changes Must Be Reported to Companies House?
Director and PSC changes must be reported within 14 days; registered office changes take effect when registered by Companies House, and a return of allotment must be delivered within one month, although an allotment must be registered within two months. Event-driven duties apply from the moment of incorporation.
Annual filings are only half of the picture. Companies House also imposes deadlines that are triggered by events inside the company. These apply from the moment of incorporation — not from the first accounting year end.
These duties apply equally when running a UK company from overseas, which is why non-resident directors frequently delegate secretarial monitoring to a professional provider.
1. Director and company secretary changes
Appointments, resignations and changes to personal details must be reported within 14 days. Persistent failure is treated as a criminal offence, so these filings should never drift.
2. People with Significant Control updates
Since 18 November 2025, the requirement to keep a company PSC register has been removed, with the information held centrally at Companies House instead. Changes to PSC details or the nature of control must be notified within 14 days of the change being confirmed. Under the current Companies House process, the notification goes directly to the central register.
3. Share allotments
New shares issued must be registered as soon as practicable and no later than two months after allotment, and the return of allotment must be delivered within one month. This deadline is longer than the 14-day rule for officers, and mixing the two up is a common error.
4. Registered office and records location
Changes to the registered office address must be notified to Companies House and take effect on registration, while changes to the address where statutory records are kept must be reported within 14 days.
Companies House Late Filing Penalties for Accounts
| How late | Penalty (private company) | If also late the previous year |
|---|---|---|
| Up to 1 month | £150 | £300 |
| 1 to 3 months | £375 | £750 |
| 3 to 6 months | £750 | £1,500 |
| More than 6 months | £1,500 | £3,000 |
What Other Registrations Does a UK Company Need After Formation?
Most new companies must also assess VAT, PAYE and data protection registrations as soon as activity begins.
Tax and data registrations are deadline-driven in the same way as Companies House filings. The three below are the ones most frequently overlooked by new directors, because none of them is tied to the incorporation date.
1. VAT registration
Where taxable turnover exceeds £90,000 in a rolling 12 months, the company must register for VAT within 30 days of the end of the month in which the threshold was passed. Failing to register backdates the liability and attracts penalties and interest.
2. PAYE for employers
A company hiring staff must register as an employer before the first payday. If the PAYE reference has not arrived, the employer should send the Full Payment Submission as soon as possible after receiving it and use late-reporting reason code G.
3. ICO data protection fee
Most companies processing personal data must register with the Information Commissioner's Office and pay an annual data protection fee, unless an exemption applies. The renewal falls due every 12 months.
Conclusion
A UK post-incorporation compliance checklist only protects a company if someone actually acts on it. The recurring deadlines — confirmation statement, annual accounts, Corporation Tax payment and CT600 — sit alongside event-driven filings and registrations for VAT, PAYE and data protection. Missing any of them carries a cost, whether that is an automatic fine, interest, a strike-off notice or a filing restriction.
The practical first step is a compliance calendar built around the company's own review period and accounting reference date. Setting reminders at incorporation, rather than when the first letter arrives, keeps every deadline visible months in advance.
As a Corporate Services Provider, 3E Accounting United Kingdom supports startups, SMEs and multinationals with company incorporation, corporate secretarial, accounting, tax and business advisory services. Backed by the 3E Accounting International Network across more than 110 countries, our team can manage the entire filing cycle for your UK company. Directors can then focus on growth. Contact us to discuss a tailored compliance plan.
Stay Compliant From Day One
Let our corporate secretarial team build a filing calendar for your UK company and manage every Companies House and HMRC deadline on your behalf.
Frequently Asked Questions
There is no automatic fixed penalty, but Companies House treats persistent non-filing as evidence the company is no longer operating and may begin strike-off proceedings. Filing restrictions under the new identity rules can also apply.
The first accounts must be filed within 21 months of the date of incorporation. Subsequent accounts are due 9 months after each accounting reference date.
Yes. The statement must be filed every 12 months even when nothing has changed, because confirming the register is accurate is the purpose of the filing.
The company must tell HMRC it is chargeable within three months of starting business activity, such as invoicing clients or signing commercial contracts. Incorporation alone does not start this clock.
The tax is payable within 9 months and 1 day of the accounting period end, while the CT600 return is due within 12 months. The payment deadline falls first.
Abigail Yu
Director
Abigail Yu oversees executive leadership at 3E Accounting Group, leading operations, IT solutions, public relations, and digital marketing to drive business success. She holds an honors degree in Communication and New Media from the National University of Singapore and is highly skilled in crisis management, financial communication, and corporate communications.
