UK LTD Annual Accounts and Corporation Tax: Deadlines, Penalties and What Non-Resident Directors Must Know

Every UK private limited company must file two separate sets of documents each year: statutory accounts with Companies House, and a Company Tax Return (CT600) with HMRC. These are different filings, with different deadlines, different penalties, and different recipients. Non-resident directors routinely confuse them — or miss one entirely. Getting both right is not optional: failure attracts automatic financial penalties, and persistent non-compliance can lead to your company being struck off the register.

Here is exactly what you need to know.

The Two Filings: Annual Accounts vs Company Tax Return

Annual accounts (statutory accounts) are filed with Companies House. They show a snapshot of your company's financial position — a balance sheet, a profit and loss account, a director's report, and notes about the accounts. These are publicly visible on the Companies House register.

The Company Tax Return (CT600) is filed with HMRC. It tells HMRC how much Corporation Tax your company owes, and includes a copy of your statutory accounts as an attachment. This is a separate filing to a separate government body.

Many non-resident founders assume these are the same thing, or that filing one covers both. They do not. You must file both, separately.

The Deadlines

GOV.UK sets out the key deadlines clearly:

• First accounts with Companies House: 21 months after the date you registered with Companies House.
• Annual accounts with Companies House (ongoing): 9 months after your company's financial year ends.
• Pay Corporation Tax: 9 months and 1 day after your accounting period for Corporation Tax ends.
• File your Company Tax Return (CT600) with HMRC: 12 months after your accounting period ends.

Note that "accounting period" and "financial year" are related but not always identical — your Corporation Tax accounting period cannot exceed 12 months, while Companies House uses your accounting reference date.

As a practical example: if your UK LTD's financial year ends on 31 December 2025, your accounts are due at Companies House by 30 September 2026, your Corporation Tax payment is due by 1 October 2026, and your CT600 is due to HMRC by 31 December 2026.

Late Filing Penalties from Companies House

Companies House applies automatic civil penalties for late accounts. For a private limited company, the penalty schedule is:

• Up to 1 month late: £150
• 1 to 3 months late: £375
• 3 to 6 months late: £750
• More than 6 months late: £1,500

These penalties are doubled if your accounts are late in two consecutive years. You receive a penalty notice automatically — no warning letter first.

Being overseas is not an accepted reason for late filing. GOV.UK is explicit that "the directors live or were travelling overseas" is not a valid ground for appeal. This catches many non-resident directors by surprise.

Your company can also be struck off the register for persistent failure to file, which can lead to its assets (including bank balances) being forfeited to the Crown.

HMRC Penalties for Late Corporation Tax Returns

HMRC applies its own separate penalty regime for a late CT600:

• 1 day late: £100 automatic penalty.
• 3 months late: A further £100 penalty.
• 6 months late: HMRC estimates your tax bill and charges 10% of the unpaid tax as a penalty.
• 12 months late: A further 10% of unpaid Corporation Tax.

If you file late in three consecutive years, the flat £100 penalties rise to £500 each. In addition to these penalties, interest accrues on any unpaid Corporation Tax from the day after it was due.

What If Your Company Is Dormant?

Many non-resident founders form a UK LTD and then do not start trading immediately. A dormant company — one with no significant accounting transactions — still has filing obligations. You must file dormant accounts with Companies House (a simplified set of accounts), and you must notify HMRC of your company's dormant status. If HMRC has sent you a "Notice to deliver a Company Tax Return," you must file a CT600 even if no tax is owed, or apply to HMRC for exemption from filing.

Do not assume that a dormant company has no obligations. Ignoring your company's filings because you have not started trading is one of the most common and costly mistakes we see.

The Accounting Reference Date and How to Change It

Your company's accounting reference date (ARD) is set automatically by Companies House as the last day of the month in which the first anniversary of your company's incorporation falls. For example, if you incorporated on 10 March 2025, your ARD is 31 March, and your first financial year ends on 31 March 2026.

You can change your ARD — to align it with a calendar year, for example — but there are rules. You can generally only shorten an accounting period, not extend it beyond 18 months. Changes must be made before the filing deadline for the accounts you want to change.

Practical Steps for Non-Resident Directors

If you are a non-resident director of a UK LTD, the key actions are:

First, know your accounting reference date and calculate your deadlines on a calendar. Put them in your diary well in advance.

Second, engage a UK accountant or authorised agent who can prepare your statutory accounts, file your CT600, and communicate with both Companies House and HMRC on your behalf.

Third, make sure your registered office address is monitored. Both Companies House and HMRC send penalty notices by post. A letter sitting in an unmonitored registered office is not a defence.

Fourth, if your company is dormant and you want to keep it without incurring costs, consider the "voluntary strike off" process — but only if you have no outstanding liabilities, no active trading, and no reason to keep the company alive.

Have Questions About Your Own Situation?

Every company's accounting period, structure, and trading status is different. If you are unsure about your deadlines, whether your company qualifies as dormant, or how to set up compliant UK LTD filings as a non-resident, the MP Partner team is happy to help — no pressure, no hard sell, just clear answers.

Book a free consultation with our experts →