Running a limited company means juggling multiple deadlines throughout the year. Miss one, and you face automatic penalties that hit your bank account hard. Miss several, and you could be looking at serious legal consequences.

The two biggest compliance headaches for UK company directors are corporation tax deadlines and Companies House filing requirements. Both have strict timelines, both carry significant penalties, and both require careful attention throughout 2026.

Let me show you exactly what you need to know and how to stay on top of every single deadline without the stress.

Understanding Your Corporation Tax Deadlines in 2026

Corporation tax is not something you can push to the back burner. HMRC expects you to meet specific deadlines based on your company’s accounting period.

Corporation Tax Return Deadline

You must file your Company Tax Return within 12 months of the end of your accounting period. So if your accounting period ended on 31 March 2025, your CT600 form is due by 31 March 2026.

Filing late triggers an automatic penalty. The longer you delay, the higher the penalty climbs. Even one day late costs you money.

Corporation Tax Payment Deadline

This is different from your filing deadline. You must pay your corporation tax within nine months and one day after the end of your accounting period. Using the same example, if your period ended on 31 March 2025, your payment is due by 1 January 2026.

Pay late, and HMRC charges interest on the outstanding amount from the due date until you pay. This interest compounds daily, turning a manageable tax bill into a growing financial burden.

Very Large Companies Pay Quarterly

If your company’s taxable profits exceed 1.5 million pounds, you fall into the quarterly instalment payment system. This means four payment dates throughout your accounting period, making deadline tracking even more complex.

Your Companies House Filing Obligations

While dealing with corporation tax, you also have Companies House breathing down your neck with its own set of deadlines.

Annual Accounts Filing

Private limited companies must file their annual accounts within nine months of their financial year end. Public companies get just six months. These deadlines are absolute.

File late and you face automatic penalties that start at 150 pounds for private companies and escalate rapidly. Three months late costs you 750 pounds. Six months late jumps to 1,500 pounds.

Confirmation Statement

Every company must file a confirmation statement at least once every 12 months. This deadline falls on the anniversary of either your incorporation date or your last confirmation statement.

The confirmation statement might seem like a simple form, but failure to file leads to penalties and could result in your company being struck off the register.

Changes and Updates

Beyond annual filings, you must notify Companies House of certain changes within 14 days. This includes director appointments or resignations, changes to your registered office address, and alterations to share capital.

Miss these short deadlines and you could face prosecution of company officers, not just financial penalties.

The Real Cost of Missing Deadlines in 2026

Let me be blunt about what happens when you miss these deadlines.

Financial Penalties Keep Growing

Corporation tax late filing penalties start at 100 pounds if you are up to three months late. Six months late increases to 200 pounds. More than 12 months late can mean penalties of 1,000 pounds or more.

Companies House penalties double if you file accounts late two years running. A pattern of late filing sends a clear signal that your company is poorly managed.

Interest and Additional Tax

HMRC charges interest on late corporation tax payments. If they believe you deliberately filed late, they can impose additional penalties of up to 100 percent of the tax due.

Damage to Your Company Reputation

Late filings appear on your public company record. Banks, suppliers, and potential business partners see this information. It damages your credibility and can affect your ability to secure credit or win contracts.

Personal Consequences for Directors

Directors can be personally prosecuted for persistent failure to file. This is not just a company problem. It becomes your personal legal issue with potential criminal consequences.

Why Smart Directors Are Using Technology

Here is the reality. You are busy running your business. You wear multiple hats. You solve problems, serve customers, manage staff, and handle a thousand other priorities every week.

Remembering every corporation tax deadline and Companies House filing date while doing all that is nearly impossible without help.

This is where the UK Companies House On The Go app changes everything.

Automatic Deadline Tracking

The app calculates all your key deadlines automatically. Input your accounting period and incorporation details once, and it tracks everything for you. No manual calendar entries. No hoping you remembered correctly.

Smart Alert System

You receive notifications well before each deadline. The app reminds you about corporation tax payments, filing deadlines, and Companies House obligations with enough advance warning to take action.

Complete Overview of All Obligations

See your entire compliance calendar in one place. Know exactly what is coming up this month, next month, and throughout the year. Nothing catches you by surprise.

Manage Multiple Companies Effortlessly

If you are a director of several companies, each with different accounting periods and filing dates, the app displays everything in one organized dashboard. You can switch between companies instantly and see all their respective deadlines.

Real-Time Companies House Data

The app pulls current information directly from Companies House, ensuring you always work with accurate company details. Any changes registered at Companies House appear in your app.

Access Anywhere, Anytime

Whether you are at your desk, meeting with your accountant, or working remotely, your deadline information travels with you on your phone or tablet.

Take Action Before Your Next Deadline

Your next deadline is closer than you think. Whether it is a corporation tax payment, annual accounts filing, or confirmation statement, that date will arrive whether you are ready or not.

The UK Companies House On The Go app gives you a simple, reliable system to stay on top of every obligation. No complicated setup. No learning curve. Just straightforward deadline management that works.

Download the App Now

App Store: https://apps.apple.com/in/app/uk-companies-house-on-the-go/id6743302358

Google Play: https://play.google.com/store/apps/details?id=com.companiesonthe.go

Stop worrying about missed deadlines. Stop paying unnecessary penalties. Download the UK Companies House On The Go app today and take control of your company compliance in 2026.

Your business success depends on staying compliant. Make it effortless with the right tools.